Jobs Node.js

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.

Blackthorn Vision is seeking a Middle Strong/Senior Backend Developer (Node.js) for an outstaff project with a global leader in energy technology. Founded in 1926 and headquartered in Houston, Texas, the company has 100,000 employees serving customers in more than 120 countries and develops software solutions for automation across the energy and industrial sectors.

You will work as part of an international team, collaborating with Blackthorn Vision specialists, client-side engineers, and management. We are looking for a self-driven team player with strong problem-solving skills, a commitment to quality, and a passion for delivering robust and maintainable software solutions. Upper-Intermediate English or higher is required for effective day-to-day communication. The position follows a regular full-time working schedule aligned with the Ukrainian time zone.

In this role, you will build and support backend services that process operational and time-series data and deliver reliable APIs and event-driven solutions. You will work with technologies such as Kafka, Azure IoT Hub, RabbitMQ, Redis, Kubernetes, and Microsoft Azure to develop high-performance, resilient, and scalable applications.

Required Qualifications:

• 4+ years of professional software development experience.
• Strong hands-on experience with Node.js and TypeScript.
• Basic experience with Java and Spring Boot.
• Experience with Microservices Architecture, Event-Driven Architecture, and REST APIs.
• Strong understanding of system architecture and business requirements.
• Hands-on experience with Kafka and RabbitMQ.
• Experience with PostgreSQL, Cassandra, Redis, or similar relational/NoSQL databases.
• Experience with Docker, Kubernetes, Microsoft Azure, and Azure IoT Hub.
• Experience with CI/CD, DevOps practices, and modern observability tools.
• Experience using AI-assisted development tools such as GitHub Copilot, Microsoft Copilot, Cursor, or similar.

• Excellent problem-solving, communication, and collaboration skills.

   

Nice to have:

• Experience working with operational and time-series data.

• Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or a related field.

   

We Offer:

• Exciting and challenging work in a friendly and professional environment.
• Excellent career opportunities and competitive salary.
• Flexible work schedule.
• Professional development program with internal seminars on technical topics.
• Courses, certifications, and access to the corporate library.
• Free English classes.
• 18 working days of paid vacation, 5 full-paid sick leave days, paid public holidays.
• Medical insurance.
• Maternity leave.
• IT club membership.
• Employee referral program.
• Recognition program with gifts and awards.
• Pet-friendly and eco-friendly.
• Direct and easy communication with management.

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 ❤️

Overview 

Come join us as we scale our retail and commerce loyalty platform! PAR Retail is looking for a Senior NodeJS engineer on its expanding product engineering team as we build and grow our Open Commerce enterprise software-as-a-service platform. 

Open Commerce is a technology suite that enables marketing professionals in the fuel & convenience industry to create real-time, hyper-personalized offers and customer interactions across a variety of channels (mobile, web, SMS, and in-person) to drive customer behavior toward a desired goal. 

Our technology bridges financial payment providers, retail fuel pump technology, and customer experience by wrapping low-level standards-compliant integrations with powerful software abstractions on an ultra-modern software platform. Our platform services and applications are built using a broad swath of technologies (Typescript, NodeJS, Ruby, React, and others), interconnected via GraphQL and RabbitMQ, and run in AWS using Terraform, Helm and Kubernetes (via EKS). 

PAR Retail has its headquarters in Philadelphia, Pennsylvania (USA) and leverages a diverse distributed product engineering and operations team across the United States and Ukraine. PAR Retail offers highly competitive compensation and benefits, as well as an engineering-friendly and product-centric culture. On PAR Retail’s Open Commerce team, we embrace a deeply collaborative software product development process where engineering, design, and product collaborate to shape and ship new functionality. 

Successful candidates will enjoy PAR Retail’s friendly and flexible culture, and embrace our relentless drive to excellence and goal of providing the #1 retail marketing platform in the fuel & convenience industry and beyond. 

Responsibilities 

• Working with the team, design and implement new functionality based on product objectives and requirements. 
• Work with the broader product engineering team to plan and coordinate feature and functionality improvements, as well as resolve bugs and execute technical enhancements, that cross-cut large parts of our platform. 
• Work to continually learn, improve technology skills, expand knowledge of the Open Commerce platform technologies, and gain increasing versatility across the breadth of our platform systems. 
• Expand APIs and business logic, and as needed write or revise customer-facing API documentation. 
• Work with our infrastructure team to enable and enhance highly-available, performant, and well-instrumented backend applications and services that run in our customer environments at substantial scale. 

• Support operations and infrastructure teams for issue resolution on relevant Open Commerce applications or services running in production environments. 

   

Qualifications 

• Practical experience building systems in Node.js 
• At least 5 years industry experience or equivalent 
• Experience building and maintaining backend APIs, including design, implementation, evolution, and maintenance 
• Familiarity with TypeScript, or similar modern strongly-typed language 
• Proficiency using both relational and non-relational database technologies 
• Strong understanding and familiarity with CI/CD pipelines and automated testing 
• Basic knowledge Docker and Kubernetes 
• Familiarity with OAuth and JWT 
• Some experience with front-end JS technologies, esp. React or Angular 
• An ability to work in service-based architectures 
• Highly independent and able to effectively self-organize and prioritize work 
• The ability to write clean code, and the discipline to write effective automated unit tests in order to deliver high-quality system improvements 
• An ability to effectively break down larger bodies of work for delivery as a series of small, self-contained changes to the system 
• Excellent spoken and written communication skills 

• BS/MS degree in Computer Science, Engineering, or equivalent years of professional working experience 

   

Bonus Points 

• Experience with Nest.js and/or GraphQL 
• Experience with Ruby on Rails 
• Experience with AWS 
• Experience working in distributed teams 

• Experience in the retail and/or fuel & convenience industries 

   

PAR Retail Offers:

- Long-term employment;

- Competitive compensation with regular performance-based salary and career development reviews;

- Paid vacations and sick leaves;

- Flexible working hours;

- A unique and friendly environment where everyone can explore and learn new technologies.

We are looking for a Backend Developer to 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

• Design and implement backend services within an existing microservices architecture.
• Experience working with production systems where performance, reliability and scalability matter.
• 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.

What We Are Looking For
Core Requirements:

• 3–5+ years of production experience in Node.js backend development.
• Strong TypeScript across the entire stack (no JavaScript-only experience).
• Solid experience with PostgreSQL: database design, joins, transactions, indexes and query optimization.
• Prisma ORM or similar ORMs and hands-on experience with relational databases.
• GraphQL schema design and resolver implementation (REST a plus).
• Practical experience working with microservices and understanding of service boundaries and inter-service communication.
• RabbitMQ or similar message brokers; event-driven architecture patterns.
 

Nice to Have:

• Experience with fintech, payments, or regulated financial products.

• Experience with distributed systems and eventual consistency — a plus.
• 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.
 

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.
• 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.

About the Role

Our promotional features team is seeking a Senior Backend Engineer. This role is focused on developing and optimizing promotional features for our gaming platforms, where performance, scalability, and cutting-edge solutions are paramount.
If you’re a product-passionate person, your mind is keen to solve deep tech engineering problems, and you have a fast "PoC first" approach with a deep sense of ownership, we would love to hear from you.

Key Responsibilities

• Develop and maintain robust backend systems for our promotional features.
• Optimize existing systems for enhanced performance and scalability.
• Lead technical decisions and contribute to our SaaS solutions.
• Collaborate with distributed teams to innovate and implement new features.
• Ensure code and architectural excellence through reviews.
• Address complex technical challenges with innovative solutions.
• Participating in on-call rotations within the squad to help ensure the reliability and availability of our systems.

Requirments

• Strong proficiency in Node.js and TypeScript (our primary backend stack). We’re also open to strong backend engineers from other ecosystems (e.g., Go, Java, C#, C++) who are ready to ramp up quickly.
• Strong understanding of asynchronous programming and concurrency patterns.
• Experience building distributed systems and working with messaging and coordination tools (e.g., Kafka, RabbitMQ, NATS, distributed locks).
• Experience with gRPC in production environments.
• Solid knowledge of databases: relational (MySQL, PostgreSQL), columnar (ClickHouse), and NoSQL (DynamoDB, MongoDB).
• Experience with cloud platforms (AWS/GCP/Azure) and Kubernetes.
• Skilled in building and maintaining unit and end-to-end tests.
• Proven track record of delivering production-ready solutions.
• Experience working with large-scale microservices architectures.
• Degree in Computer Science or a related field (or equivalent practical experience).

Nice to Have

• Understanding of enterprise development patterns
• Experienced with large-scale microservices architecture
• Experience with cloud providers (AWS, GCP, etc.)
• Active performance observation
• Gambling domain experience
• Understanding of application security and industry standards, its best practice
   

What We Offer

• Competitive Salary
• Quarterly Bonuses
• Unlimited Paid Time Off
• Unlimited Paid Sick Leave
• Remote & Flexible Working
• Private Medical Insurance
• Financial Support for Life Events
• Professional Development Budget
• International Exposure
• Regular Company Events

*Benefits may vary depending on location and contractual agreement
 

Recruitment Process

• HR interview
• Technical interview (with Live coding)
• Final interview

Please take into account that sometimes the process may differ, your TA Partner will keep you updated.

We're looking for a Middle+/Senior Backend Developer - first and foremost a strong, well-rounded backend engineer. The role splits roughly 70/30: 70% designing and maintaining our external integrations (casino operators and partner platforms), 30% general backend/platform work and system design.

🚀 What you'll do

• Design, build, and maintain integrations with casino operators and partner platforms (wallet/transaction APIs, game launch, and reporting contracts), owning the full lifecycle from contract design to production monitoring;
• Build resilient integration layers: retries, idempotency, timeouts, error mapping, and graceful degradation when a third party misbehaves;
• Contribute to core backend services and platform features - APIs, messaging flows, data models, shared modules;
• Take part in slot game development on our game logic platform - implementing game mechanics and mathematics alongside the core team;
• Define and improve integration testing practices: contract testing, mocking/stubs, e2e, and stress/load testing;
• Work closely with Game Logic, Product, and DevOps teams to keep integration contracts stable as the platform evolves;
• Participate in code reviews, technical decisions, and architecture discussions across the backend.

🧩 What you bring

• 3-5+ years of backend development experience with Node.js + TypeScript, including ownership of non-trivial systems;
• Proven experience designing and maintaining external integrations (REST/HTTP, XML/SOAP, RPC-style, or webhook-based);
• Solid understanding of modular, service-oriented backend architecture, ideally from enterprise or scale-up environments;
• Practical experience with message brokers (RabbitMQ or Kafka) and event-driven, queue-based design;
• Strong grasp of integration testing approaches: contract testing, mocking, e2e, and stress testing;
• Confident with PostgreSQL and Redis, CI/CD, Git, and monitoring/observability tools (Grafana, Loki, Tempo);
• Comfortable with AWS, Docker, and Kubernetes for containerized deployments.

💎 Nice to have

• Experience in iGaming, gambling platforms, or RNG/game provider integrations;
• Familiarity with ArgoCD and GitOps workflows.

🎁 Benefits

• 21 vacation days + 2 extra day-offs annually;
• 12 paid sick days;
• Fully remote format - work from anywhere you feel productive;
• Flexible schedule: start your day anytime between 08:00-11:00 CET;
• Fixed budget for health insurance and gym/fitness;
• Provided all required work equipment;
• Zero bureaucracy and direct communication with founders and C-level;
• Minimal meetings, async-friendly workflow;
• Startup energy: fast motion, creativity, and tight-knit communication;
• Business trips and team meetups several times per year;
• Multiple salary payout options (flexible formats);
• …And many more perks unlocked after we hit break-even.

Про проєкт

Шукаємо спеціаліста, який розуміється на browser security, fingerprinting, anti-fraud та аналізі browser environment.

Основний напрямок роботи — дослідження технічних параметрів браузера, мережевого оточення та сигналів, які використовуються сучасними системами для аналізу та класифікації веб-сесій.

Основні задачі

• Аналіз browser environment та browser fingerprint.
• Дослідження параметрів, які доступні веб-сайтам та anti-fraud системам.
• Аналіз browser detection та bot detection mechanisms.
• Робота з JavaScript Browser APIs.
• Дослідження та runtime instrumentation JavaScript у тестовому середовищі.
• Аналіз User-Agent, Client Hints, Referer, Headers та Cookies.
• Аналіз WebGL, Canvas, WebRTC, WebGPU та інших browser signals.
• Аналіз IP, Geo, ASN, Proxy та network characteristics.
• Робота з HTTP/HTTPS та TLS.
• Аналіз результатів anti-fraud та fingerprinting систем.
• Пошук невідповідностей між browser, device та network parameters.
• Тестування різних browser environments.
• Взаємодія з C++ / Chromium developer для аналізу та вирішення browser-level задач.
• Інтеграція та тестування зовнішніх diagnostic / anti-fraud systems.

Вимоги

• Від 2 років практичного досвіду роботи з anti-detect browsers.
• Від 2 років практичного досвіду роботи з browser fingerprinting / browser detection.
• Від 2 років досвіду роботи з browser automation.
• Впевнене знання JavaScript.
• Глибоке розуміння Browser APIs.
• Практичний досвід роботи з browser environment та fingerprinting.
• Розуміння User-Agent, Client Hints, Referer, Headers, Cookies.
• Розуміння WebGL, Canvas, WebRTC, WebGPU.
• Розуміння HTTP/HTTPS, TLS та browser networking.
• Досвід роботи з Proxy, SOCKS5 / HTTP Proxy.
• Розуміння IP / Geo / ASN та network characteristics.

• Здатність аналізувати складні browser/network signals та знаходити невідповідності.
   

  Ми пропонуємо

• Віддалена робота.
• Довгостроковий проєкт з цікавими технічними задачами.
• Конкурентна заробітна плата.
• Оплачувана відпустка та лікарняні.
• Мінімум бюрократії та максимум технічної свободи.

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;
• Availability to work until 2-3 pm US EST time zone.

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.

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.

Our partner is a leading B2B iGaming supplier delivering engaging casino content to regulated markets worldwide. Since 2012, they’ve been building high-quality gaming experiences through a modern cloud-native platform that powers hundreds of operator brands across multiple jurisdictions.

Their Platform Solutions team sits at the heart of that ecosystem, enabling seamless integrations between the company, operators, aggregators and platform providers.

Our partner is looking for a Senior Backend Developer who thrives in a deeply hands-on environment and enjoys being close to the code on a daily basis. This role is heavily focused on building, optimising, and scaling backend services in a high-load system where performance and reliability are critical.

You’ll be working on complex, real-time challenges at the core of their platform – improving latency, ensuring high availability, and making systems more efficient at scale. This is not a coordination-heavy role; it’s for someone who enjoys writing production code, solving tough engineering problems, and seeing the direct impact of their work.

Main Responsibilities

• Work as part of a cross-functional team owning a core product within the platform
• Design, build, and deliver new backend features end-to-end in a distributed environment
• Write high-quality, production-level code daily, contributing directly to a high-load, scalable system
• Take ownership of services handling financial transactions at scale, with a strong focus on reliability
and accuracy
• Proactively suggest and implement improvements in architecture, processes, and development
practices
• Participate in code and architectural reviews to maintain high engineering standards
• Solve complex business and technical challenges with pragmatic, efficient solutions
• Participating in on-call rotations within the squad to ensure the reliability and availability of our
systems
• Play an active role in ongoing tech transformation initiatives across the platform
• Collaborate closely with engineers, product, and other stakeholders to deliver impactful solutions
used by millions globally

Mandatory Requirements

• Solid experience with Node.js/TypeScript is ideal, but we also welcome experts in other OOP
languages such as Java, Python, C++, C#, or Go.
• Strong understanding of asynchronous programming techniques
• Experience with distributed systems and messaging systems (Apache Kafka, gRPC)
• Knowledge of relational databases (MySQL, PostgreSQL), columnar databases (ClickHouse), and
NoSQL technologies (DynamoDB, MongoDB)
• Skilled in developing and maintaining end-to-end and unit tests
• Proven track record of developing production-ready solutions
• Degree in Computer Science or related field

Nice to Have

• Experience with large-scale microservices architecture.
• Good ground knowledge of Kubernetes
• Familiarity with cloud providers (especially AWS)
• Understanding of application security and industry best practices
• Understanding of enterprise development patterns
• Active performance observation
• Gambling domain experience

We offer

• Competitive Salary
• Quarterly Bonuses
• Unlimited Paid Time Off
• Unlimited Paid Sick Leave
• Remote & Flexible Working
• Private Medical Insurance
• Financial Support for Life Events
• Professional Development Budget
• International Exposure
• Regular Company Events

Location: Remote (Preferably European time zones)

About the Company

Near Prime is looking for a Backend Engineer for one of your partner projects, who are redefining play with a one-of-a-kind cube-shaped gaming console that merges the physical and digital worlds. This Entertainment System combines modular hardware, immersive software, and creative game design to create a brand-new category of interactive entertainment. They are a fast-growing, innovative game development studio pushing the boundaries of interactive entertainment.

About the Role

We are looking for an experienced Backend Engineer to build and scale the backend infrastructure powering the cube's ecosystem. You will be responsible for the server-side architecture behind our website, mobile applications, and connected gaming devices, ensuring secure, reliable, and high-performance communication across all platform components.

In this role, you will develop backend services that manage user accounts, the game catalog, purchases, and device connectivity, while designing scalable APIs and event-driven systems that support a growing ecosystem of players and hardware. You will collaborate closely with frontend, mobile, embedded, and DevOps engineers to deliver reliable backend solutions that bridge cloud services with physical devices.

Key Responsibilities

• Design, develop, and maintain scalable backend services using Node.js, TypeScript, and NestJS.
• Build and maintain RESTful APIs, including authentication, authorization, versioning, pagination, rate limiting, and security best practices.
• Design and implement microservice-based, event-driven architectures using gRPC, Protocol Buffers, and RabbitMQ.
• Develop backend systems supporting user management, game catalog, purchases, and cloud services for mobile and web applications.
• Build and maintain integrations between cloud services and WOWCube hardware, processing telemetry and device communication.
• Design and optimize MongoDB data models, queries, and overall database performance.
• Ensure backend services are secure, reliable, and scalable through proper testing, monitoring, and performance optimization.
• Collaborate with cross-functional teams, including frontend, mobile, embedded, QA, and DevOps engineers, throughout the software development lifecycle.
• Participate in code reviews, write unit and integration tests, and contribute to improving engineering best practices.

• Support deployment, maintenance, and troubleshooting of services running in containerized and Kubernetes environments.

   

Requirements

• 5+ years of commercial backend development experience with Node.js and TypeScript.
• Strong experience building production applications with NestJS.
• Solid understanding of REST API design, including authentication, authorization, versioning, pagination, and rate limiting.
• Experience designing and maintaining microservice and event-driven architectures.
• Hands-on experience with gRPC, Protocol Buffers, and asynchronous messaging systems such as RabbitMQ.
• Strong knowledge of MongoDB and NoSQL database design.
• Good understanding of HTTP protocols (HTTP/1.1, HTTP/2, HTTP/3) and network communication fundamentals.
• Experience with applied security concepts, including JWT, hashing, encryption, and digital signatures.
• Experience working with Docker, Git, code reviews, and automated unit/integration testing.
• Understanding of containerized deployments and Kubernetes concepts, including service discovery, configuration, and scaling behavior.

• Strong problem-solving skills and the ability to work independently in a distributed engineering team.

   

Desirable Pluses

• Experience with MQTT or other communication protocols used for connected devices.
• Experience working with certificates, certificate lifecycle management, and secure device authentication.
• Experience with BLE, IoT platforms, or OTA (Over-the-Air) update systems.
• Experience with ClickHouse or other analytical databases.
• Familiarity with Vitest or Jest.
• Experience working with monorepo architectures.

• Previous experience building backend systems for connected devices, gaming platforms, or consumer hardware products.

   

What We Look for in Your Application

• An updated CV highlighting your backend technology stack and the production systems you have built or contributed to.
• Examples of scalable backend architectures, microservices, APIs, or distributed systems you have designed or maintained (GitHub or portfolio links are welcome where applicable).
• Experience working on products involving cloud services, mobile applications, connected devices, or IoT integrations is highly valued.

We're building a modern accounting SaaS, think QuickBooks, but genuinely nice to use. The backend is a forked Akaunting (Laravel) core owned by a dedicated backend engineer. Your job is everything the user sees: a fast, beautiful, mobile-first Next.js app that makes accounting feel less like accounting.

We work AI-native (Claude Code, Cursor, v0).

Your part:

• Build the entire frontend in Next.js + TypeScript + Tailwind -- dashboards, invoices, expense flows, reports, onboarding, settings
• Own the design system (shadcn / Radix based) and component library
• Turn Figma or scoped ideas into motion-aware UI
• Consume the backend's REST/JSON API; collaborate closely with the backend engineer on API shape
• Small stuff: empty states, loading states, error states, keyboard shortcuts, accessibility

Come Back Agency supports US software and technology companies by running their hiring process. We work with delivery and leadership teams to define roles, screen candidates, and manage interviews. Successful candidates are hired directly by the company and become part of its team. 

Employer information: This position is with a US-based software company providing custom development and AI implementation for North American clients. The team builds and maintains production software, including AI-enabled systems, and works in long-term client engagements. Team members operate as part of an internal, distributed team and collaborate directly with client stakeholders. 
 

About the role:

We are looking for a talented Node.js Backend Developer to join our dynamic team. You will be responsible for developing and maintaining server-side logic, defining and maintaining the central database, and ensuring high performance and responsiveness to requests from the frontend. If you’re passionate about building scalable backend systems and have experience with Node.js, Express,Nest,js Sequelize,Prisma, Socket.io, and databases like Redis, PostgreSQL, and MongoDB, we’d love to hear from you!

 What you will do:

• Develop, maintain, and improve backend services using Node.js, Express.js, and Nest.js.
• Design scalable and maintainable system architecture for web applications and services.
• Build and optimize RESTful APIs and ensure secure integration with internal and third-party systems.
• Work with PostgreSQL, Redis, and MongoDB for data storage, caching, and performance optimization.
• Implement real-time functionality using Socket.io or similar technologies.
• Develop and support file upload and processing flows using Multer or equivalent tools.
• Implement secure authentication and authorization mechanisms using JWT, OAuth, and role-based access control.
• Apply backend security best practices, including CORS, input validation, error handling, and access control.
• Optimize application performance, reliability, and scalability in production environments.
• Write clean, maintainable, and testable code following best engineering practices.
• Collaborate closely with frontend developers, QA engineers, and product teams to deliver end-to-end features.
• Integrate external APIs, payment providers, cloud services, and other third-party solutions.
• Contribute to the design and development of microservices and distributed systems.
• Use Docker for local development, service orchestration, and deployment consistency.
• Deploy, monitor, and maintain services on AWS or other cloud platforms.
• Participate in code reviews, technical discussions, and architecture decisions.
• Maintain and improve technical documentation for services, integrations, and internal processes.

What we are looking for:

• 2+ years of commercial backend development experience with Node.js.
• English level B2 or higher.
• Strong hands-on experience with Express.js and Nest.js in production projects.
• Solid experience with Prisma or other ORMs and a good understanding of database design principles.
• Strong knowledge of REST API design, integration patterns, and backend best practices.
• Practical experience with Socket.io or other real-time communication solutions.
• Strong knowledge of PostgreSQL and experience with Redis for caching and performance improvements.
• Working knowledge of MongoDB and understanding when to use relational vs non-relational databases.
• Experience with Docker in development and deployment workflows.
• Good understanding of AWS services such as EC2, S3, Lambda, or similar cloud platforms.
• Solid understanding of backend security practices: JWT, OAuth, CORS, validation, authorization, and secure API design.
• Good knowledge of Git and collaborative development workflows.
• Understanding of microservices architecture, service communication, and scalable system design.
• Strong problem-solving, analytical, and debugging skills.
• Ability to write structured, readable, and maintainable code with attention to quality.
• Good communication skills and ability to work effectively in a team environment.
• Experience participating in code reviews and improving engineering quality.

Nice to have:

• Familiarity with CI/CD pipelines.
• Experience with Kubernetes.
• Exposure to logging and monitoring tools (e.g., ELK, Prometheus).

Hiring stages: Recruiter screening → Technical interview (live coding) → Final culture fit interview.

What We Offer:

• Working hours aligned with US time zones, typically 16:00—00:00 Kyiv time.
• English lessons to support clear and confident communication.
• Paid vacation and sick days.
• Fully remote work.
• Opportunities for professional growth within the team.
• Structured, personalized onboarding to help you ramp up effectively.

Apply with your resume and a short note outlining your relevant experience. You can also send your resume directly using our website at comeback.ua. Selected candidates will be contacted by the Come Back Agency.

 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.