Jobs Node.js

N-iX is a global software development service company that helps businesses across the globe create next-generation software products. Founded in 2002, we unite 2,400+ tech-savvy professionals across 40+ countries, working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud, data, AI/ML, embedded software, IoT, and more, driving digital transformation across finance, manufacturing, telecom, healthcare, and other industries. Join N-iX and become part of a team where your ideas make a real impact.

Our client is a technology company specializing in smart building and energy management solutions. Their platform enables organizations to monitor, control, and optimize building operations, including HVAC, lighting, power, and other building systems, improving energy efficiency and operational performance.

Important: Australian time zone, working hours from 8:00 AM UA.

Responsibilities:

• Design, develop, and maintain high-quality, scalable, and maintainable software solutions;
• Collaborate with Product Owners, Architects, QA, and other stakeholders to define and implement technical solutions;
• Write clean, efficient, and reliable code, following coding standards and engineering best practices, unit tests
• Conduct code reviews and provide constructive feedback to maintain high code quality;
• Identify, troubleshoot, and resolve complex technical issues and performance bottlenecks;
• Contribute to estimation, sprint planning, and other Agile ceremonies;
• Promote continuous improvement by introducing new tools, technologies, and engineering practices;

• Create and maintain technical documentation.

   

Requirements:

• 5+ years of commercial experience in Back-End development;
• Expert knowledge of JavaScript and TypeScript;
• Strong knowledge of Express.js and NestJS frameworks;
• Strong experience with MongoDB;
• Experience with Jest for unit and integration testing;
• Strong experience in REST API design and implementation;
• Experience working with streaming platforms (e.g., Kafka) and message brokers (e.g., RabbitMQ);

• Experience with Swagger for API documentation;

   

Nice to have:

• Strong experience with Docker and AWS Cloud services (ECS, Fargate, S3, S3 Glacier, Cloudfront, Route 53, WAF)
• Experience with ClickHouse and DynamoDB;
• Experience with MQTT;
• Understanding of system design, including scalable and distributed architectures;;
• Experience working with time-series data;
• Experience working with high-volume data;
• Experience in IoT projects;

• Front-end development experience is a strong plus.

   

We offer*:

• Flexible working format - remote, office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits

*not applicable for freelancers

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;
• Paid vacation and holidays;
• 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.

Project description

Our client is a technology company specializing in smart building and energy management solutions. Their platform enables organizations to monitor, control, and optimize building operations, including HVAC, lighting, power, and other building systems, improving energy efficiency and operational performance.

Important: Australian time zone, working hours from 8:00 AM UA.

Key Responsibilities:

• Leading and mentoring the development team, providing technical guidance and supporting engineers' professional growth;
• Collaborating with Product Owners, Architects, QA, and other stakeholders to define technical solutions and project roadmaps;
• Driving technical design and architecture decisions, ensuring scalability, maintainability, and security of the solution;
• Planning and coordinating development activities, prioritizing technical work, and managing delivery risks;
• Ensuring adherence to coding standards, development best practices, and quality assurance processes;
• Identifying and resolving technical blockers, supporting the team in troubleshooting complex issues;
• Contributing to estimation, sprint planning, and release planning activities;
• Promoting continuous improvement by introducing new tools, technologies, and engineering practices.
• Writing code, conducting code reviews, creating and maintaining technical documentation

Requirements:

• 7+ years of commercial experience in Back-End development, including experience in a Lead or Technical Lead role;
• Expert knowledge of JavaScript and TypeScript;
• Strong experience with AWS Cloud services;
• Expert knowledge of Express.js and NestJS frameworks;
• Strong experience with MongoDB;
• Experience with Jest for unit and integration testing;
• Strong experience in REST API design and implementation;
• Experience working with streaming platforms (e.g., Kafka) and message brokers (e.g., RabbitMQ);
• Experience with Swagger for API documentation;
• Strong understanding of system design, including scalable and distributed architectures.
• Experience of working with a high volume of data
• Experience with MQTT;
• Upper-Intermediate level of English;

Nice to have:

• Experience with ClickHouse;
• Experience with DynamoDB;
• Experience working with time-series data;
• Experience in IoT projects;
• Front-end development experience is a strong plus.

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.

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.

Hey there! 👋

We're looking for an expert full-stack React/Node.js engineer with experience in building AI tools to join our growing team! We're working on a product that has already made an impact in a major U.S. industry and has gained traction with several Fortune 500 companies. We're a small yet powerful team, but considering recent growth - expect plenty of opportunities of growth and a chance to tackle interesting engineering challenges!

What skills we expect you to have: 🎯

• English: Advanced (B2+)
• B.Sc. in Computer Science or similar;
• Excellent communication, collaboration, problem-solving, and analytical skills;
• 5+ years of writing commercial React.js and Node.js apps;
• Extensive experience with SQL-based databases;
• Extensive experience with Amazon Web Services;
• Understanding of LLMs and their application to building web applications;

What would be a huge plus: ✨

• English: C1
• Background in building your own side projects (please share links);
• Experience of leading engineering teams or initiatives at your previous company;
• Experience in building CI/CD pipelines;
• You have experience building AI apps (LangChain / LlamaIndex) and with MLOps;

What’s in it for you: 🌴

Professional Growth & Lifestyle:

- Remote work and flexible working hours (our team is 100% remote);

- Opportunity to join an international team of a fast-scaling startup;

- Leadership initiatives;

Benefits:

- Annual vacation: 20 business days (100% compensation)

- Annual sick leave: 10 business days (100% compensation)

- Competitive compensation.

Please, feel free to reach out if you have any questions!

Best regards,

Universium Team ❤️

Project about building the payments infrastructure that merchants have been waiting for. A single integration, intelligent routing, and the kind of reliability that lets businesses stop thinking about payments and get back to running their business.
The platform is real, the merchants are real, and the problems are hard. We're integrating multiple payment providers, routing transactions intelligently across them, and doing it in a way that's secure, scalable, and maintainable.

Core Development
● You build the services that make payments move. Sessions, routing, provider adapters, webhooks; you work across the core of the platform, end-to-end, from database schema through to deployment.
● You integrate payment providers properly. Clean adapter patterns, consistent error handling, and abstractions that make the tenth integration as maintainable as the firstYou write code that handles real money. That means understanding the failure modes, thinking about idempotency, and never cutting corners on correctness because correctness is the product.
● You contribute to architecture, not just implementation. You raise design concerns early, engage in technical decisions, and leave things better than you found them.

Quality & Performance
● You test what you build. Unit tests, integration tests, E2E tests, and an understanding of what each is actually for. You don't hand things to QA hoping for the best.
● You debug with rigour. When something goes wrong in production, you trace it, understand it, and fix the root cause, not just the symptom.
● You review code seriously. You give feedback that improves the codebase, and you take feedback the same way.Collaboration
● You work closely with the Tech Lead. You implement architectural decisions together and contribute meaningfully to technical design conversations.
● You engage with the product function. You take time to understand what you're building and why. Acceptance criteria exist to be understood.
● You show up to Agile ceremonies and contribute to them. Standups, sprint planning, retros; they only work if people engage honestly.
● You support the team across deployment, observability, and incident response. Shipping doesn't end at the PR merge.

How You’ll Be Successful
● What you ship works, and keeps working. Test coverage is real, regressions are rare, and you're not the source of production surprises.
● Provider integrations are clean and maintainable. The team can extend them without unpicking your decisions six months later.
● You raise concerns before they become problems. Whether it's a design risk, dependency, or edge case, you flag it early with context for the team to act.
● Your code reviews make the codebase better. Not just caught bugs, but clearer thinking, better abstractions, and a higher collective bar.
● The team trusts you across time zones. Async communication is clear, commitments are kept, and you don't go quiet when things get complicated.

About the job

Profisea is a boutique DevOps and Cloud company — AWS Premier Partner specializing in Cloud Architecture, DevOps, DevSecOps and FinOps.
We are looking for Senior Backend Engineer.

The Role

As a Senior Backend Engineer, you will be a core pillar of our R&D. We are looking for a "Force Multiplier" , a seasoned engineer who thrives on efficiency and leverages modern AI-assisted workflows to deliver high-quality, production-grade code at an exceptional pace.

You will own complex features from architecture to production, leading our backend evolution and helping the team adopt the next generation of engineering practices.

What You’ll Do

• Design & Architect: Build scalable, high-performance services powering our autonomous decision-making engine using Node.js.
• Master Real-Time Systems: Solve complex challenges involving sensor integration and mission-planning algorithms using Event-Driven Architectures (EDA), Caching strategies, and scalable data distribution via Pub/Sub and Queues.
• AI-Driven Delivery: Act as a champion for AI-powered engineering, using the latest tools to boost delivery speed while maintaining architectural precision.
• End-to-End Ownership: Lead features from technical design and async flow implementation to production deployment.
• Collaborate: Partner closely with Product and other R&D teams to translate operational defense-grade needs into elegant technological solutions.

What You Bring

• 7+ years of professional experience in backend development (Node.js & TypeScript).
• AI-Native Mindset: Extensive experience with AI-powered development tools (Cursor, Claude, Copilot) to 5x your output.
• Framework & Architecture Mastery: Deep experience with Nest.js and building modular, distributed, and autonomous systems.
• Data Mastery: Strong proficiency in both relational and NoSQL databases—specifically PostgreSQL and MongoDB. You know how to design schemas and optimize queries for high-scale, real-time environments.
• Async Expertise: Hands-on experience with Event-Driven patterns, Pub/Sub, and Queues (e.g., Redis, RabbitMQ).
• Cloud-Native Excellence: Proficiency in CI/CD, Docker, and Kubernetes (K8S). You believe in "shifting left" and comprehensive testing.
• Academic Foundation: B.Sc. in Computer Science, Software Engineering, or equivalent practical experience.
• Problem-Solving Prowess: A natural ability to resolve complex architectural issues in a high-stakes environment.

Bonus Points:

• Frontend Familiarity: Experience with React and modern frontend workflows. Being Fullstack-oriented is a major advantage in our fast-paced environment.

🌟 About SelfInspection

SelfInspection is a fast-growing AI-driven vehicle inspection platform transforming how leasing companies, fleets, and financial institutions process vehicle damage assessments.

We combine computer vision, automation, and modern cloud architecture to deliver scalable and intelligent inspection workflows.

We are building a robust, event-driven backend system — and we’re looking for a strong Senior/Lead Backend Engineer to help us scale it properly.

🧠 What You’ll Do

• Design and build scalable microservices using NestJS (TypeScript)
• Architect and maintain event-driven systems using Kafka / RabbitMQ
• Design clean domain-driven services (inspection flows, reports, billing, notifications)
• Work with PostgreSQL (schema design, optimization, migrations)
• Improve system reliability, observability, and performance
• Participate in architectural decisions (modular monolith vs microservices boundaries)
• Collaborate closely with frontend, QA, and AI teams
• Write clean, testable, production-ready code
• Help improve CI/CD and deployment pipelines (AWS environment)

🏗 Tech Stack

• Backend: NestJS (TypeScript)
• Architecture: Microservices, Event-Driven
• Messaging: Kafka and/or RabbitMQ
• Database: PostgreSQL
• Cloud: AWS
• Containerization: Docker
• CI/CD: GitHub Actions (or similar)
• APIs: REST (future: gRPC)

✅ Requirements

• 7+ years of backend development experience
• Strong experience with microservices architecture
• Hands-on experience with event-driven systems (Kafka or RabbitMQ)
• Deep knowledge of NestJS or Node.js backend frameworks
• Strong experience with PostgreSQL (indexes, performance tuning, transactions)
• Understanding of distributed systems challenges (idempotency, retries, eventual consistency)
• Experience designing APIs and maintaining clean contracts
• Startup mindset: ownership, autonomy, speed

🎯 Nice to Have

• Experience with Domain-Driven Design (DDD)
• Experience with inspection, insurance, fintech, or fleet systems
• Familiarity with Kubernetes
• Experience building high-throughput systems
• Knowledge of AI/ML service integrations

💼 What We Offer

• Work on a real AI product with global customers
• Strong technical ownership
• Fast-paced startup culture
• Flexible work schedule
• Competitive compensation
• Opportunity to shape architecture decisions

💡 Who Will Thrive Here

Someone who:

• Thinks in systems, not just endpoints
• Cares about architecture quality
• Can balance speed and correctness
• Takes ownership instead of waiting for tickets

Description:

We are hiring a strong senior engineer for a production-grade AI Operations Platform (real infrastructure, not wrappers), as a dedicated full-time engineer.

You will own architecture and delivery end-to-end: clean NestJS backends with real separation of concerns, MongoDB modeled and indexed around actual access patterns, and a Next.js / React front. This is architecture-first work where structure and data modeling are the difference between scaling and rewriting.

Small team, real infrastructure, end-to-end ownership.

Must-have (mandatory):

• Expert NestJS / Node.js (6+ years backend)
• Strong MongoDB (modeling, indexing)
• Next.js / React on the front
• Deep on system design, database design, and design patterns (the interview goes deep here)
• Clean-architecture mindset, real ownership
• Comfortable with AI-assisted dev tools (Cursor / Copilot)
• Strong English, comfortable leading daily technical calls

Nice-to-have:

• AI/ML or AI-agent production experience (not required)
• Cloud / DevOps basics (CI/CD, deployments)

Conditions:

• Full-time, dedicated to ONE client (no parallel projects), long-term
• Virtual-office model: team stays in a shared Google Meet during work hours, cameras and mics off by default, on only when needed. Not monitoring, just ambient presence; free breaks
• Timezone: comfortable overlap with GMT+2/+3 (client in Israel)
• Process: the interview includes a short live technical screen-share. Please share a GitHub/GitLab or a code sample you can walk us through.

Looking forward to your reply!
 

About the Role

We are looking for an experienced Node.js / Python Developer to join us long-term and take ownership of a production WhatsApp automation platform used by real customers.

You will work on two interconnected systems:

• A multi-account WhatsApp messaging platform with scheduling, personalization, real-time monitoring, and campaign management.
• A device automation platform that manages Android emulators, account lifecycle, automation flows, and integrations.

This is a long-term role focused on product development, system reliability, and building new features.

Responsibilities

• Develop and maintain production Node.js and Python applications.
• Implement new features based on business requirements.
• Improve system stability, performance, and scalability.
• Optimize APIs, databases, and real-time communication.
• Extend automation workflows and plugin functionality.
• Maintain and improve the frontend where needed.
• Work with an existing codebase and contribute to its long-term evolution.

Requirements

• Strong commercial experience with Node.js.
• Strong commercial experience with Python.
• Experience with Express.js and FastAPI.
• Solid understanding of REST APIs and WebSockets.
• Experience with asynchronous programming and concurrent systems.
• Good knowledge of SQLite or similar relational databases.
• Strong JavaScript fundamentals (Vanilla JS).
• Basic PHP knowledge for maintaining existing functionality.
• Ability to work independently on production systems.

Nice to Have

• Experience with WhatsApp automation (Baileys or similar).
• Android / ADB knowledge.
• Experience with PyQt or desktop applications.
• Experience designing plugin or extension architectures.
• Knowledge of rate limiting, anti-detection, or automation systems.

We Offer

• Long-term collaboration.
• Existing production product with active users.
• Full onboarding and documentation.
• Opportunity to take ownership of a technically challenging platform.
• Flexible remote work.

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 Middle 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

About Us
We are a fast-growing and leading company in the AI Voice space for the iGaming industry. We replace inefficient manual processes with scalable, reliable, and high-performance AI technology. Our solutions are already used by 20+ brands across 8+ geographies. We are well-funded, ambitious, and building a team of top professionals.

We’re looking for a Backend Developer to build and maintain reliable backend services and integrations. You’ll work with TypeScript services, REST APIs, and cloud infrastructure, and help us deliver features through clean architecture, automated tests, and robust CI/CD pipelines.

Responsibilities

• Design, build, and maintain backend services using TypeScript
• Develop and document REST APIs and handle API integrations with external systems
• Work with MongoDB: data modeling, performance optimization, and query tuning
• Containerize and run services using Docker
• Improve reliability and delivery speed via CI/CD, version control best practices, and code reviews
• Apply OOP principles and maintain clean, scalable architecture
• Write and maintain automated tests (unit/integration) and ensure quality gates
• Deploy and operate services on AWS (e.g., EC2, S3, Lambda) and monitor production stability
• Implement and support workflow orchestration using Temporal or a similar workflow engine

Requirements (Must-have) 

• Strong experience with TypeScript
• Experience with Node.js
• Hands-on experience with MongoDB
• Confident with Docker
• Good knowledge of Git/GitHub and modern development workflows
• Experience with CI/CD pipelines
• Solid understanding of OOP and clean code practices
• Practical experience with automated testing
• Experience with REST APIs and third-party API integration
• Exposure to AWS services: EC2, S3, Lambda
• Experience with Temporal or a comparable workflow/orchestration engine
• Practical AI fluency: ability to use AI tools (e.g. Claude, Cursor, Copilot) as part of daily development workflow — for code generation, debugging, and documentation
• Experience collaborating in AI-augmented teams: comfortable working in environments where teammates actively use AI tools and share prompts, workflows, and outputs

What we offer 

• Fully remote work format and flexible working hours.
• Competitive salary pegged to USD.
• 24 days of paid vacation (sick leave, national, religious, and company holidays).
• A friendly communication culture and transparent processes.
• Dynamic work environment.
• Opportunities for professional development and career growth.
• No micromanagement — just trust, ownership, and freedom to experiment.

Description:

We are hiring a strong senior engineer for a production-grade AI Operations Platform (real infrastructure, not wrappers), as a dedicated full-time engineer.

You will own architecture and delivery end-to-end: clean NestJS backends with real separation of concerns, MongoDB modeled and indexed around actual access patterns, and a Next.js / React front. This is architecture-first work where structure and data modeling are the difference between scaling and rewriting.

Small team, real infrastructure, end-to-end ownership.

Must-have (mandatory):

• Expert NestJS / Node.js (6+ years backend)
• Strong MongoDB (modeling, indexing)
• Next.js / React on the front
• Deep on system design, database design, and design patterns (the interview goes deep here)
• Clean-architecture mindset, real ownership
• Comfortable with AI-assisted dev tools (Cursor / Copilot)
• Strong English, comfortable leading daily technical calls

Nice-to-have:

• AI/ML or AI-agent production experience (not required)
• Cloud / DevOps basics (CI/CD, deployments)

Conditions:

• Full-time, dedicated to ONE client (no parallel projects), long-term
• Virtual-office model: team stays in a shared Google Meet during work hours, cameras and mics off by default, on only when needed. Not monitoring, just ambient presence; free breaks
• Timezone: comfortable overlap with GMT+2/+3 (client in Israel)