Jobs Node.js

We are looking for a Lead Backend Developer to architect and own the backend infrastructure of our fintech platform. You will design scalable microservices, manage critical data flows, and ensure system reliability at scale. Work directly with product, design, and business stakeholders to translate requirements into robust backend systems.

What You Will Do
Backend Architecture & Design

• Own the backend architecture end-to-end across microservices.
• Design and implement Node.js / Express services handling 20M+ transactions monthly.
• Architect PostgreSQL schemas for reliability and performance at scale.
• Define API contracts (GraphQL, REST) that support frontend and partner integrations.
• Make critical decisions on data consistency, caching, and async patterns.

Microservices & System Design

• Build and maintain multiple Node.js / Express microservices with clear ownership boundaries.
• Implement webhook-driven workflows and event-driven architecture.
• Design and implement real-time data synchronization pipelines.
• Manage message queues (RabbitMQ) for async operations and inter-service communication.
• Ensure row-level security (RLS) and multi-tenant data isolation at the database layer.

Data & Performance

• Design and optimize PostgreSQL schemas using Prisma ORM.
• Write complex queries, manage indexes, and ensure query performance.
• Implement caching strategies and data consistency patterns.
• Build audit trails and changelog tracking for compliance and debugging.
• Handle sensitive data (KYC, AML, financial records) with security-first approach.

Integration & Third-Party Services

• Integrate with external services (KYC providers, document verification, acquiring networks).
• Design and maintain API integrations with payment processors and clearing centers.
• Build robust error handling and retry logic for critical integrations.
• Document APIs and maintain SDK/integration guides for partners.
Communication & Leadership

• Work directly with product managers and stakeholders to clarify backend requirements.
• Proactively flag technical risks, propose solutions, and keep stakeholders informed.
• Give technical feedback on product feasibility and scalability implications.
• Lead backend code reviews with focus on quality, performance, and knowledge sharing.
• Mentor junior developers and foster backend engineering best practices.

What We Are Looking For
Core Requirements:

• 5–7 years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• PostgreSQL expertise: schema design, optimization, transactions, advanced queries.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Microservices architecture: designing boundaries, managing state, async communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
• Experience with fintech, payments, or regulated financial products.
• Strong communication skills and comfort working directly with non-technical stakeholders.

Nice to Have:

• Distributed systems experience (eventual consistency, saga patterns, consensus).
• gRPC for service-to-service communication.
• Experience scaling to 100K+ users and handling high transaction volume.
• Background in AML/KYC compliance or financial data handling.
• DevOps sensibility: monitoring, logging, deployment pipelines.
• Experience mentoring backend teams.

Tech Stack
Core: Node.js, Express, TypeScript, PostgreSQL, Prisma ORM, GraphQL, RabbitMQ, gRPC
Supporting: REST APIs, Webhooks, Real-time data sync, Multi-tenant architecture, Audit logging

What We Offer

• Full backend ownership and architectural control.
• Work on systems handling millions of transactions and 100K+ merchants.
• Direct access to product and business stakeholders.
• Modern microservices stack with no legacy debt.
• AI-friendly engineering culture—we embrace tools that make you more effective.
• Deep fintech learning: multi-partner networks, compliance, payment flows.
• Competitive compensation and benefits package.

About the Position

We’re growing fast and looking for a Senior Backend Engineer to join our Engineering team and help build the infrastructure that powers our platform at scale.

This is a high-impact role where you’ll work alongside top-tier engineers, designing and building secure, high-performance systems in a fast-paced environment. If you enjoy solving complex technical challenges and want your work to have real impact — we’d love to meet you.

What We’re Looking For

• Bachelor’s degree in Computer Science or a related field
• 5+ years of experience in backend development
• Strong experience building scalable, production-grade systems
• Proficiency in Node.js
• Experience with SQL and NoSQL databases
• Familiarity with cloud platforms and microservices architecture
• Strong problem-solving skills and attention to detail
• Passion for writing clean, maintainable, and efficient code

Bonus Points For

• Experience in cybersecurity or building security-focused products
• Experience working in startup or high-growth environments
• Familiarity with DevSecOps / SDLC tools
• Experience with distributed systems and high-scale data processing

Node.js Developer — LogicCraft (Lviv, on-site)

We're a fast-growing tech company building modern, innovative digital products - and we're looking for a Node.js Developer to join our team in Lviv. If you enjoy designing solid backend systems, working with APIs, and being part of a team that values engineering quality, we'd love to hear from you.

What you'll be doing

You'll work alongside a cross-functional team to build and maintain scalable server-side applications, design and integrate APIs, and contribute to key architectural decisions that shape our products from the ground up.

What we're looking for

• Solid hands-on experience with Node.js
• Practical experience with Express.js
• Experience working with ORM tools
• Proficiency in SQL databases (MySQL / PostgreSQL) and NoSQL databases
• Experience designing server-side application architecture from scratch
• Strong understanding of REST API development and third-party API integrations

• Responsible, self-motivated, and comfortable working both independently and as part of a team

   

What we offer

• Full-time, in-office position in Lviv
• Official employment and a competitive salary based on your skills and experience
• Company-provided equipment
• A well-structured work schedule
• A friendly, supportive team and a comfortable office environment
• Mentorship and guidance from experienced colleagues
• Interesting and technically challenging projects to grow on

How to apply

Send us your CV — we review every application and get back to candidates promptly. This could be the start of something great.

Pixel mindIT is an innovative IT company specializing in software development, web applications, and mobile apps. We bring together a team of passionate professionals working with cutting-edge technologies. With us, you'll find a creative approach to complex challenges, efficient project management, and a culture of continuous growth.
 

Requirements:

- Basic to intermediate knowledge of HTML/CSS, JavaScript, and TypeScript
- Familiarity with or hands-on experience in Node.js using Express.js and/or Nest.js frameworks
- Understanding of networking principles: RESTful API design and HTTP/HTTPS protocols
- Familiarity with GraphQL APIs
- Basic understanding of databases: MongoDB, Redis, MySQL, PostgreSQL
- Eagerness to learn ORM tools such as Mongoose, Prisma.js, TypeORM, and Sequelize
- Familiarity with Git version control and GitHub in collaborative environments

What We Offer

- Flexible working hours
- Official employment with a competitive salary based on your experience and skills
- Open positions from Trainee to Middle — grow with us
- English language courses to support your professional development
- Modern office with high-quality equipment and a comfortable workspace
- Friendly and supportive team that encourages both professional and personal growth
- The opportunity to work on exciting and innovative projects

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

We are developing a security and compliance platform that helps organizations identify, prioritize, and remediate security risks across employee devices. The solution scans endpoints for vulnerabilities, missing patches, and security configuration issues, processes large volumes of device and security data, and enables automated remediation.
The product is built on a distributed, data-intensive architecture that combines backend services, data processing pipelines, and endpoint agents. The platform requires high scalability, reliability, and efficient data processing to support complex security and compliance workflows. 

 

About the Role:

As a Senior Backend Engineer you will take end-to-end ownership of the core backend components in our compliance platform. In this individual contributor role, you will shape the architecture of the real-time telemetry pipeline, back-end services, data models, and risk-scoring engine. You will translate product and business requirements into technical trade-offs, propose simple solutions that work at scale, and challenge assumptions early in the design process. 

This position offers the opportunity to make high-impact architectural decisions and drive the technical direction of a mature, growing security product.

Key Responsibilities:

• Design and implement distributed backend services for real-time telemetry ingestion and risk scoring across thousands of endpoints.
• Build and maintain event-driven streaming pipelines using Kafka - from topic design and partitioning to consumer groups and delivery guarantees.
• Define data models and persistence strategies on PostgreSQL and Redis, optimizing for latency, consistency, and throughput.
• Write, analyze, and tune complex SQL queries; improve query plans, indexing, and overall database performance.
• Develop and maintain large-scale data processing environments, focusing on scalability, reliability, and cost efficiency.
• Identify bottlenecks in pipelines and services, and implement improvements for performance and stability.
• Translate business needs into technical requirements and influence product and architectural roadmaps.
• Collaborate with DevOps on CI/CD pipelines, container orchestration, observability, and production reliability.

Required Competence and Skills:

• 8+ years of backend development experience, including scalable distributed systems that process large volumes of data.
• Advanced hands-on expertise in TypeScript and Node.js, with strong knowledge of backend architecture and service design.
• Hands-on experience with event-driven/streaming architectures, ideally with Kafka (topic design, partitioning, consumer groups, delivery guarantees).
• Advanced knowledge of PostgreSQL and Redis, including query optimization, indexing, and performance tuning.
• Good understanding of cloud environments (Azure preferred; AWS is also relevant), containers (Docker/Kubernetes), CI/CD, observability, and general DevOps concepts, with hands-on experience using these tools in day-to-day development.
• Hands-on experience using AI tools in software development, with the ability to critically evaluate and validate AI-generated output.
• Strong product mindset and the ability to make sound technical decisions based on both engineering requirements and business needs.

Nice to Have:

• Background in information security, endpoint security, or compliance.
• Familiarity with edge-deployed agents and device-to-cloud communication.
• Experience integrating AI/LLM capabilities into backend systems.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays in the country where you are based).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model, with a powerful workstation and a co-working space available if needed.

We offer a highly competitive package with yearly performance and compensation reviews.

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

Our client is a product technology company developing a cloud-native platform that enables organizations to build, integrate, and operate secure applications leveraging blockchain and distributed ledger technologies. The platform provides scalable backend services, APIs, and infrastructure components designed for high-performance, production-grade environments.

The engineering team focuses on building resilient backend systems, distributed architectures, and blockchain-enabled services while addressing challenges related to scalability, reliability, performance, and security. Engineers collaborate closely across product, platform, and infrastructure teams to deliver robust software solutions used in mission-critical environments.

About the Role:

As a Senior Full Stack Engineer with a strong backend focus, you will design, develop, and maintain scalable backend services while also contributing to modern web applications where needed. You'll work with microservices, APIs, asynchronous architectures, blockchain integrations, and React-based frontend components, collaborating closely with cross-functional engineering teams.

This role offers end-to-end ownership of product features from architecture and implementation through deployment, monitoring, and continuous improvement, with the primary focus on backend services.

Key Responsibilities:

• Design and build scalable backend services supporting blockchain-enabled applications and distributed systems.
• Contribute to frontend features and modern React-based applications when required, ensuring a seamless end-to-end user experience.
• Develop and maintain backend services, APIs, and platform components throughout the software lifecycle.
• Integrate backend services with blockchain networks, third-party platforms, and external infrastructure.
• Evaluate emerging blockchain technologies and architectural approaches to improve platform capabilities.
• Optimize production systems for scalability, reliability, security, and performance.
• Collaborate with product, platform, infrastructure, and security teams to deliver production-ready solutions.
• Take ownership of features from design through deployment and ongoing optimization.

Required Competence and Skills:

• 7+ years of professional experience as a Full Stack or Backend Engineer.
• Strong commercial experience with Node.js, TypeScript, and React.
• Experience designing scalable backend services, APIs, and production-grade microservices. 
• Solid understanding of distributed architectures, asynchronous communication, and event-driven systems. 
• Commercial experience working with multiple blockchain ecosystems, including EVM-compatible chains, as well as non-EVM chains
• Good understanding of blockchain fundamentals, transaction processing, smart contracts, and decentralized architectures.
• Strong understanding of secure software design and building reliable production systems. 
• Experience using AI-assisted development tools (Claude Code, Cursor, GitHub Copilot, or similar) as part of the engineering workflow. 
• Bachelor's degree in Computer Science or a related technical field (or equivalent practical experience). 
• Proven ability to deliver software from design through production deployment.

Nice to Have:

• Experience building products in high-scale distributed platforms, fintech, or cloud-native products.
• Experience with cloud-native infrastructure, containers, and Kubernetes.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

We are developing a security and compliance platform that helps organizations identify, prioritize, and remediate security risks across employee devices. The solution scans endpoints for vulnerabilities, missing patches, and security configuration issues, processes large volumes of device and security data, and enables automated remediation.
The product is built on a distributed, data-intensive architecture that combines backend services, data processing pipelines, and endpoint agents. The platform requires high scalability, reliability, and efficient data processing to support complex security and compliance workflows.

About the Role:

As a Senior Backend Engineer you will take end-to-end ownership of the core backend components in our compliance platform. In this individual contributor role, you will shape the architecture of the real-time telemetry pipeline, back-end services, data models, and risk-scoring engine. You will translate product and business requirements into technical trade-offs, propose simple solutions that work at scale, and challenge assumptions early in the design process. 

This position offers the opportunity to make high-impact architectural decisions and drive the technical direction of a mature, growing security product.

Key Responsibilities:

• Design and implement distributed backend services for real-time telemetry ingestion and risk scoring across thousands of endpoints.
• Build and maintain event-driven streaming pipelines using Kafka – from topic design and partitioning to consumer groups and delivery guarantees.
• Define data models and persistence strategies on PostgreSQL and Redis, optimizing for latency, consistency, and throughput.
• Write, analyze, and tune complex SQL queries; improve query plans, indexing, and overall database performance.
• Develop and maintain large-scale data processing environments, focusing on scalability, reliability, and cost efficiency.
• Identify bottlenecks in pipelines and services, and implement improvements for performance and stability.
• Translate business needs into technical requirements and influence product and architectural roadmaps.
• Collaborate with DevOps on CI/CD pipelines, container orchestration, observability, and production reliability.

Required Competence and Skills:

• 8+ years of backend development experience, including scalable distributed systems that process large volumes of data.
• Advanced hands-on expertise in TypeScript and Node.js, with strong knowledge of backend architecture and service design.
• Hands-on experience with event-driven/streaming architectures, ideally with Kafka (topic design, partitioning, consumer groups, delivery guarantees).
• Advanced knowledge of PostgreSQL and Redis, including query optimization, indexing, and performance tuning.
• Good understanding of cloud environments (Azure preferred; AWS is also relevant), containers (Docker/Kubernetes), CI/CD, observability, and general DevOps concepts, with hands-on experience using these tools in day-to-day development.
• Hands-on experience using AI tools in software development, with the ability to critically evaluate and validate AI-generated output.
• Strong product mindset and the ability to make sound technical decisions based on both engineering requirements and business needs.

Nice to Have:

• Background in information security, endpoint security, or compliance.
• Familiarity with edge-deployed agents and device-to-cloud communication.
• Experience integrating AI/LLM capabilities into backend systems.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

What should you know about SKELAR? It's a venture builder — in other words, a company that builds companies. Together with founders, we create consumer businesses that become leaders in global markets across EdTech, Mental Health, Petcare, FashionTech, and beyond.

Our teams build tech products that win recognition from Product Hunt and The Webby Awards, earn thousands of glowing Trustpilot reviews, and reach over 10 million users worldwide. That kind of impact doesn't happen by accident — it starts with exceptional people, and our people are our top priority.

We've built an environment where expertise meets opportunity, and where there's no ceiling on what you can achieve. Now we're looking for the kind of people who don't just want a job — they want a challenge.

We’re looking for a Middle Node.js Developer for our partner company, Duomo.

Duomo is an app rooted in Christian values, helping people turn Scripture into daily habits and inner peace. We’re building a leading Christian-tech product for people seeking spiritual renewal.

You will be responsible for:
 

• Driving MarTech Automation: Designing, developing, and scaling backend services to automate marketing technology processes and integration workflows.
• Streamlining Creative Processes: Building robust tools and systems that automate the asset lifecycle and streamline creative operations for the team.
• Enhancing System Observability: Implementing comprehensive tracking, metrics, logs, and tracing (Observability) to ensure high system visibility and performance monitoring.
• Strengthening Infrastructure Reliability: Expanding test coverage (unit, integration, end-to-end) and setting up automated testing pipelines to ensure high code quality and fault tolerance.
• Architecting Scalable Solutions: Participating in system architecture design, code reviews, and optimizing backend performance to support business growth.

What you need to succeed in this role:

• 2+ years of experience with Node.js + TypeScript & NestJS.
• PostgreSQL + any typed ORM (Drizzle, Prisma, or TypeORM).
• Redis & Message Queues (BullMQ, RabbitMQ, or SQS) — hands-on experience with idempotency, retries, and distributed locks.
• Third-party REST API integrations — handling rate limits, pagination, and partial failures.

• Docker, CI/CD, and unit testing with Jest

   

  Nice-to-Have Requirements

• Experience with Facebook Marketing API, Google Ads API, or other ad platforms (TikTok, Applovin)
• Cloud & Infra: AWS (ECS, ECR, S3, Lambda) and GitHub Actions
• Observability: Prometheus, Grafana, and structured logging
• Integrations with Airtable API and Google Sheets API
• Practical experience with LLM APIs (Claude, Gemini) — structured output and prompt versioning

Why Duomo:

— You’ll work on a product with a clear mission and real values.
— You’ll help us transition from a content-rich app into a truly connected spiritual platform.
— You’ll be early enough to influence how product is done at Duomo long-term.

What we offer:

— Competitive salary;
— Significant impact on a rapidly growing business and contribution to how it shapes up;
— Ample career opportunities for ambitious growth and development;
— A possibility to attend internal, external courses, seminars and the access to a corporate library;
— Comfortable working environment. We provide all necessary work equipment for your role and serve complimentary breakfasts, lunches, and snacks in the office;
— 20 days of paid vacation, medical insurance and a variety of sports activities available for employees inside and outside the office.

At SKELAR, we've built an environment where people can grow, build, and do the most meaningful work of their careers:

• SKELAR Platform. The operational backbone of our venture builder. It exists to help founders move faster and easier — so business teams can stay laser-focused on the product while 10+ specialized Platform takes care of everything else: Legal, Finance, HR, Admin, Talent Acquisition, Employer Branding, IT, and more.
• Networking and knowledge-sharing as a way of life. Our people include co-founders who've launched multiple businesses and some of the sharpest specialists in the industry. Whatever expertise you need, it's never far away.
• Learning programs you won't find anywhere else. We've developed our own educational tracks for teammates to choose from — a two-month school for first-time managers, intensive AI workshops, and professional clubs for engineers, product managers, and more.
• Meaningful impact in Ukraine. The SKELAR Foundation was created by our own people, and every employee plays a part in bringing important social initiatives to life. We founded Europe's first accelerator for veterans and are working to build lasting support structures for veterans at a national scale.
• Spaces designed to inspire. Our offices are places people actually want to be — with an in-house gym, a climbing wall, Bali-inspired green spaces, and libraries. Every detail, from service and security to comfort and design, is built to match the pace of our growing teams.
• Everyday comfort built in. Meals, gym access in Kyiv or a partial fitness stipend in Warsaw, health insurance, paid business travel where the role requires it, and corporate partner discounts.

We'd love to tell you more in person.

Join us at SKELAR and help build the next big everything!

We are looking for a Lead Backend Developer to architect and own the backend infrastructure of our fintech platform. You will design scalable microservices, manage critical data flows, and ensure system reliability at scale. Work directly with product, design, and business stakeholders to translate requirements into robust backend systems. 

This is a hybrid role, and we are currently considering candidates based in Lviv (Ukraine). 

Fully remote work is not an option for this position.

What You Will Do
Backend Architecture & Design

• Own the backend architecture end-to-end across microservices.
• Design and implement Node.js / Express services handling 20M+ transactions monthly.
• Architect PostgreSQL schemas for reliability and performance at scale.
• Define API contracts (GraphQL, REST) that support frontend and partner integrations.
• Make critical decisions on data consistency, caching, and async patterns.

Microservices & System Design

• Build and maintain multiple Node.js / Express microservices with clear ownership boundaries.
• Implement webhook-driven workflows and event-driven architecture.
• Design and implement real-time data synchronization pipelines.
• Manage message queues (RabbitMQ) for async operations and inter-service communication.
• Ensure row-level security (RLS) and multi-tenant data isolation at the database layer.

Data & Performance

• Design and optimize PostgreSQL schemas using Prisma ORM.
• Write complex queries, manage indexes, and ensure query performance.
• Implement caching strategies and data consistency patterns.
• Build audit trails and changelog tracking for compliance and debugging.
• Handle sensitive data (KYC, AML, financial records) with security-first approach.

Integration & Third-Party Services

• Integrate with external services (KYC providers, document verification, acquiring networks).
• Design and maintain API integrations with payment processors and clearing centers.
• Build robust error handling and retry logic for critical integrations.
• Document APIs and maintain SDK/integration guides for partners.
Communication & Leadership

• Work directly with product managers and stakeholders to clarify backend requirements.
• Proactively flag technical risks, propose solutions, and keep stakeholders informed.
• Give technical feedback on product feasibility and scalability implications.
• Lead backend code reviews with focus on quality, performance, and knowledge sharing.
• Mentor junior developers and foster backend engineering best practices.

What We Are Looking For
Core Requirements:

• 5–7 years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• PostgreSQL expertise: schema design, optimization, transactions, advanced queries.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Microservices architecture: designing boundaries, managing state, async communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
• Experience with fintech, payments, or regulated financial products.
• Strong communication skills and comfort working directly with non-technical stakeholders.

Nice to Have:

• Distributed systems experience (eventual consistency, saga patterns, consensus).
• gRPC for service-to-service communication.
• Experience scaling to 100K+ users and handling high transaction volume.
• Background in AML/KYC compliance or financial data handling.
• DevOps sensibility: monitoring, logging, deployment pipelines.
• Experience mentoring backend teams.

Tech Stack
Core: Node.js, Express, TypeScript, PostgreSQL, Prisma ORM, GraphQL, RabbitMQ, gRPC
Supporting: REST APIs, Webhooks, Real-time data sync, Multi-tenant architecture, Audit logging

What We Offer

• Full backend ownership and architectural control.
• Work on systems handling millions of transactions and 100K+ merchants.
• Direct access to product and business stakeholders.
• Modern microservices stack with no legacy debt.
• AI-friendly engineering culture—we embrace tools that make you more effective.
• Deep fintech learning: multi-partner networks, compliance, payment flows.
• Competitive compensation and benefits package.

 Hi! We are looking for a Senior Node.js Backend Developer (Payments Platform) to join our pack at SharksCode 🦈💙
 SharksCode is a Ukrainian IT company that develops high-tech software solutions and scalable B2B platforms.
 We are looking for a Senior Node.js Backend Developer who will help build and evolve our payment platform, working on scalable backend services, distributed systems, and integrations with external financial providers. In this role, you will participate in architectural decisions, develop secure and reliable payment flows, and contribute to building resilient, high-load backend services.

We expect that you:

• Have 6+ years of commercial backend development experience with Node.js.
• Have strong commercial experience with TypeScript and a deep understanding of its type system.
• Have hands-on experience designing and developing REST APIs.
• Write clean, maintainable, well-tested, and production-ready code.
• Have experience decomposing complex business requirements into scalable technical solutions.
• Can clearly explain and justify technical decisions, trade-offs, risks, and alternative approaches.
• Have strong practical experience with PostgreSQL, including query optimization, indexing, schema design, and performance tuning under high load.
• Have hands-on experience designing and developing microservice-based distributed systems.
• Understand distributed and event-driven architectures.
• Have practical experience working with Kafka.
• Have hands-on experience using Redis.
• Have experience implementing retries, timeouts, circuit breakers, rate limiting, and backpressure mechanisms.
• Have experience integrating third-party APIs, including payment providers, PSPs, banks, KYC providers, or other external services.
• Have a solid understanding of secure software development principles.
• Have practical knowledge of OAuth 2.0, JWT, HMAC, mTLS, API authentication, and authorization.
• Can identify security vulnerabilities in code, APIs, dependencies, configurations, and system architecture.
• Have experience conducting code reviews and technical audits of backend services.
• Understand principles of protecting personal, payment, and other sensitive data.
• Have a strong understanding of HTTP/HTTPS, TCP/IP, DNS, Webhooks, and the lifecycle of network requests.
• Understand TLS/mTLS, certificate lifecycle management, rotation, and secure certificate storage.
   

Your future responsibilities:

• Design, develop, and maintain backend services for the payment platform.
• Build reliable integrations with payment providers, banks, and external financial services.
• Develop scalable microservices and distributed backend components.
• Participate in architecture discussions and contribute to technical decision-making.
• Optimize PostgreSQL performance and ensure system reliability under high load.
• Ensure backend security and compliance with engineering best practices.
• Conduct code reviews and contribute to improving engineering standards within the team.
• Collaborate closely with product, QA, and infrastructure teams to deliver reliable production solutions.
   

Nice to have:

• Experience with GraphQL or gRPC.
• Experience building payment platforms, financial services, or payment processing systems.
• Experience in iGaming, Betting, FinTech, Banking, or E-commerce domains.
• Understanding of payment lifecycle concepts such as authorization, capture, void, refund, reversal, and chargeback.
• Understanding of reconciliation, settlement, payment routing, and cascading.
• Knowledge of PCI DSS, KYC/AML, and secure payment data processing.
• Experience with observability tools such as Prometheus, Grafana, OpenTelemetry, Loki, or Jaeger.
• Experience mentoring engineers and improving engineering practices.
• Understanding of threat modeling, attack surface analysis, secrets management, and the principle of least privilege.
   

Interview stages:
🤝 Interview with Recruiter.
🧠 Technical Interview.
💙 Offer.

We offer:
🌴 24 paid vacation days, 14 sick days, and 5 days off.
⏰ Flexible start of the working day — from 9:00 to 11:00.
🏥 Medical insurance.
💰 Bonuses and performance-based rewards.
🐶 Office in the center of Kyiv — pets are welcome, we are pet-friendly.
💆 Lounge area in the office to recharge during the day.
🎾 Padel tennis, football, and training at the polygon for those who enjoy active leisure.
📚 Learning compensation, internal meetups and workshops, as well as access to the corporate LMS with courses.
🎁 Corporate currency that can be exchanged for merch, gifts, or additional benefits.

About the Role

  We're looking for an experienced Backend Developer (Node.js / NestJS) to join our engineering team in Prague.

You'll work on a large-scale international B2C platform serving users across multiple markets. Our products process high volumes of transactions and real-time events, requiring reliable, scalable, and high-performance backend services.

If you enjoy building distributed systems, integrating third-party services, and solving complex backend challenges, we'd love to meet you.

Responsibilities:

• Develop and maintain backend services within a microservices architecture
• Build new product features and improve existing functionality
• Integrate third-party APIs and external service providers
• Design and optimize SQL and NoSQL databases
• Create database migrations and indexes
• Optimize application performance and SQL queries
• Work with Docker, Kubernetes, AWS
• Collaborate with Backend Engineers, QA Engineers, and Product Managers

• Participate in code reviews and architectural discussions

   

Requirements:

• 3–6 years of commercial Backend development experience
• Strong knowledge of Node.js
• Commercial experience with NestJS
• Experience with SQL and NoSQL databases
• Experience building microservices

• Understanding of distributed systems and REST APIs

   

Nice to Have:

• Experience with Go
• Unit and Integration Testing
• ClickHouse
• Experience with high-load / real-time systems

• Experience integrating payment providers

   

What We Offer:

• Office-based position in Prague, official employment
• Modern technology stack
• Paid vacation, sick leave, paid overtime
• Friendly international team

• Opportunity to influence product architecture

   

Hiring Process:

1. HR Interview
2. Test Assignment
3. Final Interview
4. Offer

United Tech is a global IT product company shaping the future of real-time social connection. With millions of users across North America, Europe, LATAM, and MENA, we build next-gen mobile and web apps for live-streaming and social networking. Our platforms enable connection at scale — fast, interactive, and deeply engaging. The market is projected to exceed $206B by 2030, and we are already leading the evolution. Founded in Ukraine, scaling worldwide.

About your role:

We're looking for a Node.js Backend Developer to join the backend team. You'll be building the infrastructure that powers revenue and growth — from web billing integrations with payment providers to server-side marketing pipelines that fuel acquisition. If you thrive in high-load, product-driven environments where your code ships to real users and directly impacts the bottom line, this role was made for you.

In this role, you will

• Develop and ship web billing integrations: payment providers, subscriptions, recurring billing, webhook handling (idempotency, retries, reconciliation)
• Develop and ship marketing integrations: attribution platforms, server-side conversion/events APIs, analytics and CRM/ESP pipelines
• Create technical designs for product epics and decompose them into actionable tasks
• Participate in team processes: grooming, sprint planning, estimations
• Run investigations and tech research (3rd-party API limits, provider selection, edge cases)
• Address tech debt and improve reliability and observability of integrations
• Take part in the full SDLC: design, dev, code review, testing, release, support

It's all about you

• 3+ years of commercial backend development experience
• 2.5+ years with Node.js (TypeScript)
• Solid experience with relational and non-relational databases (PostgreSQL, MongoDB, Redis)
• Experience with SOA/microservices: inter-service communication and dev process
• Strong fundamentals in design principles and patterns (SOLID, event-driven)
• Experience integrating third-party REST APIs: auth, rate limits, retries, webhooks, idempotency
• Experience with async processing / message queues (BullMQ, RabbitMQ or Kafka)
• Experience with a cloud provider (AWS / GCP)
• Understanding of scaling and high-load systems
• Daily use of AI coding assistants (Claude Code, Cursor, GitHub Copilot) for development, refactoring, tests, and documentation
• Ability to write effective prompts and review/validate AI-generated code — quality and security ownership stays with you
• Upper-Intermediate English or higher

Would be a plus

• Hands-on web billing / payment integrations (Stripe, Paddle, Solidgate, Recurly, Braintree, PayPal) and subscription/recurring-billing logic
• Payments domain knowledge: 3DS, PCI-DSS basics, chargebacks/fraud, dunning, reconciliation
• Marketing/growth integrations: AppsFlyer/Adjust, Meta CAPI, Google/TikTok events APIs, S2S postbacks
• Experience with analytics/event pipelines and CRM/ESP tools
• DDD / CQRS, WebSockets (ws, socket.io)
• Understanding of how to integrate LLM APIs into product features

What we offer

Care and support:

• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• Up to 10 additional days off for public holidays
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Team building events, corporate gifts, and stylish merch
• Maternity Recovery Support Allowance
• Financial and legal support
• Position retention and support for those who join the Armed Forces of Ukraine
• Participation in social initiatives supporting Ukraine

Comfortable working environment:

• Work from our Kyiv hub or remotely with a flexible schedule
• Modern equipment or depreciation of your own tools

Investment in your future:

• Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
• 70% of our heads and leads have grown into their roles here — so can you!
• Performance-oriented reviews and Individual Development Plans (IDPs)
• Reimbursement for professional courses and English classes
• Corporate library, book club, and knowledge-sharing events

Hiring process

• Intro call
• Technical interview
• Final Interview
• Reference check
• Offer

Our client is building the next generation of AI-powered learning technology, helping educational institutions deliver more personalized and effective learning experiences. As their platform continues to grow, they are expanding the engineering team with a Backend Engineer who will own the critical systems connecting their AI learning platform with leading Learning Management Systems (LMS) such as Canvas, Brightspace (D2L), Moodle, and Blackboard.

This is a high-impact, high-ownership role focused on designing and maintaining the backend infrastructure that powers seamless integration between customer LMS environments and the company's platform. You will work on authentication, LTI standards, API integrations, data synchronization, and scalable backend services that enable the secure exchange of users, courses, enrollments, assignments, and learning content.

Their engineering team values ownership, technical excellence, and pragmatic problem solving. They are looking for someone who enjoys building reliable backend systems, solving complex integration challenges, and collaborating across engineering, product, and customer-facing teams to deliver exceptional customer experiences.

As a Backend Engineer, you will:

• Design, build, and maintain integrations with major LMS platforms, including Canvas, Brightspace (D2L), Moodle, Blackboard, and others;
• Own LTI launch flows, LMS authentication, API permissions, and customer-specific integration configurations;
• Develop scalable backend services using Node.js and TypeScript to synchronize LMS data with the company's platform;
• Design and maintain data models using PostgreSQL and Neo4j;
• Troubleshoot and resolve complex integration issues involving OAuth, SAML, JWT, LTI 1.3, APIs, and data mapping;
• Improve system reliability through enhanced observability, logging, monitoring, and internal support tooling;
• Collaborate closely with Product, Customer Success, and Engineering teams to onboard new educational institutions and ensure successful LMS integrations;
• Contribute to the continuous improvement of the backend architecture and integration infrastructure.

Qualifications:

• Strong commercial experience building backend applications with Node.js and TypeScript;
• Proven experience developing and maintaining third-party API integrations;
• Experience working with relational and/or graph databases, particularly PostgreSQL and Neo4j;
• Solid understanding of authentication and authorization technologies, including OAuth, JWT, SAML, and LTI 1.3;
• Strong debugging, troubleshooting, and problem-solving skills;
• Excellent communication skills with both technical and non-technical stakeholders;
• Self-driven, proactive, and comfortable taking ownership of complex technical systems;
• At least Upper-intermediate English (B2) or higher.

Nice to Have:

• Experience integrating with Learning Management Systems such as Canvas, Brightspace (D2L), Moodle, Blackboard, or similar platforms;
• Background in EdTech, Higher Education, or multi-tenant SaaS products;
• Experience working with background jobs, message queues, monitoring platforms, or cloud infrastructure;
• Familiarity with modern backend architecture, distributed systems, and scalable integration services.

We offer:

• Competitive market salary;
• Fully remote work environment;
• Flexible working hours with collaboration across international teams;
• Opportunity to work on an innovative AI-driven product transforming education;
• A collaborative, highly skilled international engineering team;
• Challenging technical problems, significant ownership, and excellent opportunities for professional growth.

Who we are:

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries.

About the Product:

We are developing a security and compliance platform that helps organizations identify, prioritize, and remediate security risks across employee devices. The solution scans endpoints for vulnerabilities, missing patches, and security configuration issues, processes large volumes of device and security data, and enables automated remediation.
The product is built on a distributed, data-intensive architecture that combines backend services, data processing pipelines, and endpoint agents. The platform requires high scalability, reliability, and efficient data processing to support complex security and compliance workflows. 

 

About the Role:

As a Senior Backend Engineer, you will take end-to-end ownership of the core backend components in our compliance platform. In this individual contributor role, you will shape the architecture of the real-time telemetry pipeline, back-end services, data models, and risk-scoring engine. You will translate product and business requirements into technical trade-offs, propose simple solutions that work at scale, and challenge assumptions early in the design process. 

This position offers the opportunity to make high-impact architectural decisions and drive the technical direction of a mature, growing security product.

Key Responsibilities:

• Design and implement distributed backend services for real-time telemetry ingestion and risk scoring across thousands of endpoints.
• Build and maintain event-driven streaming pipelines using Kafka - from topic design and partitioning to consumer groups and delivery guarantees.
• Define data models and persistence strategies on PostgreSQL and Redis, optimizing for latency, consistency, and throughput.
• Write, analyze, and tune complex SQL queries; improve query plans, indexing, and overall database performance.
• Develop and maintain large-scale data processing environments, focusing on scalability, reliability, and cost efficiency.
• Identify bottlenecks in pipelines and services, and implement improvements for performance and stability.
• Translate business needs into technical requirements and influence product and architectural roadmaps.
• Collaborate with DevOps on CI/CD pipelines, container orchestration, observability, and production reliability.

Required Competence and Skills:

• 8+ years of backend development experience, including scalable distributed systems that process large volumes of data.
• Advanced hands-on expertise in TypeScript and Node.js, with strong knowledge of backend architecture and service design.
• Hands-on experience with event-driven/streaming architectures, ideally with Kafka (topic design, partitioning, consumer groups, delivery guarantees).
• Advanced knowledge of PostgreSQL and Redis, including query optimization, indexing, and performance tuning.
• Good understanding of cloud environments (Azure preferred; AWS is also relevant), containers (Docker/Kubernetes), CI/CD, observability, and general DevOps concepts, with hands-on experience using these tools in day-to-day development.
• Hands-on experience using AI tools in software development, with the ability to critically evaluate and validate AI-generated output.
• Strong product mindset and the ability to make sound technical decisions based on both engineering requirements and business needs.

Nice to Have:

• Background in information security, endpoint security, or compliance.
• Familiarity with edge-deployed agents and device-to-cloud communication.
• Experience integrating AI/LLM capabilities into backend systems.

Why Us:

We provide 20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).

We provide full accounting and legal support in all countries we operate.

We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.

We offer a highly competitive package with yearly performance and compensation reviews.

We are looking for a Lead Backend Developer to architect and own the backend infrastructure of our fintech platform. You will design scalable microservices, manage critical data flows, and ensure system reliability at scale. Work directly with product, design, and business stakeholders to translate requirements into robust backend systems.

What You Will Do
Backend Architecture & Design

• Own the backend architecture end-to-end across microservices.
• Design and implement Node.js / Express services handling 20M+ transactions monthly.
• Architect PostgreSQL schemas for reliability and performance at scale.
• Define API contracts (GraphQL, REST) that support frontend and partner integrations.
• Make critical decisions on data consistency, caching, and async patterns.

Microservices & System Design

• Build and maintain multiple Node.js / Express microservices with clear ownership boundaries.
• Implement webhook-driven workflows and event-driven architecture.
• Design and implement real-time data synchronization pipelines.
• Manage message queues (RabbitMQ) for async operations and inter-service communication.
• Ensure row-level security (RLS) and multi-tenant data isolation at the database layer.

Data & Performance

• Design and optimize PostgreSQL schemas using Prisma ORM.
• Write complex queries, manage indexes, and ensure query performance.
• Implement caching strategies and data consistency patterns.
• Build audit trails and changelog tracking for compliance and debugging.
• Handle sensitive data (KYC, AML, financial records) with security-first approach.

Integration & Third-Party Services

• Integrate with external services (KYC providers, document verification, acquiring networks).
• Design and maintain API integrations with payment processors and clearing centers.
• Build robust error handling and retry logic for critical integrations.
• Document APIs and maintain SDK/integration guides for partners.
Communication & Leadership

• Work directly with product managers and stakeholders to clarify backend requirements.
• Proactively flag technical risks, propose solutions, and keep stakeholders informed.
• Give technical feedback on product feasibility and scalability implications.
• Lead backend code reviews with focus on quality, performance, and knowledge sharing.
• Mentor junior developers and foster backend engineering best practices.

What We Are Looking For
Core Requirements:

• 5–7 years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• PostgreSQL expertise: schema design, optimization, transactions, advanced queries.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Microservices architecture: designing boundaries, managing state, async communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
• Experience with fintech, payments, or regulated financial products.
• Strong communication skills and comfort working directly with non-technical stakeholders.

Nice to Have:

• Distributed systems experience (eventual consistency, saga patterns, consensus).
• gRPC for service-to-service communication.
• Experience scaling to 100K+ users and handling high transaction volume.
• Background in AML/KYC compliance or financial data handling.
• DevOps sensibility: monitoring, logging, deployment pipelines.
• Experience mentoring backend teams.

Tech Stack
Core: Node.js, Express, TypeScript, PostgreSQL, Prisma ORM, GraphQL, RabbitMQ, gRPC
Supporting: REST APIs, Webhooks, Real-time data sync, Multi-tenant architecture, Audit logging

What We Offer

• Full backend ownership and architectural control.
• Work on systems handling millions of transactions and 100K+ merchants.
• Direct access to product and business stakeholders.
• Modern microservices stack with no legacy debt.
• AI-friendly engineering culture—we embrace tools that make you more effective.
• Deep fintech learning: multi-partner networks, compliance, payment flows.
• Competitive compensation and benefits package.