Jobs Node.js

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, and Serbia by storm. Our BRO team consists of 1,300 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.

❗️ Important: This is an On-Site Position in Spain❗️

This is an on-site position based at our office in Valencia, Spain. Remote or hybrid arrangements are not available once you join the team.

Are you ready for an international move? 
To make your transition smooth, we provide full relocation support and visa sponsorship for successful international candidates ❗️

⚡ We are looking for an experienced Team Lead Backend Developer (Node.js) to join our development teams in Valencia and lead the backend technologies of our systems. This is a highly hands-on role: you will be actively writing and reviewing code, shaping architecture, and driving technical excellence while mentoring your team.

✅ Responsibilities:

• Lead, mentor, and manage backend engineers through regular one-to-one sessions, feedback, performance evaluations, and individual development plans.
• Actively write, review, and refactor code and directly contribute to building and improving our systems.
• Participate in agile ceremonies (Scrum/Kanban) to ensure team alignment and adherence to agile best practices.
• Enhance system quality by resolving technical debt, optimizing architecture and flows, and performing data cleaning and restructuring.
• Design solutions and make key technical decisions for changes and enhancements.
• Assign tasks and balance workloads within the team to ensure efficient delivery.
• Collaborate with Engineering Managers to adopt the latest technologies and drive company-wide engineering initiatives.
• Document domain knowledge, improve engineering standards, and contribute to initiatives that enhance the broader engineering organization.

✅ Requirements:

• Bachelor’s, Master’s, or higher degree in Computer Engineering, Computer Science, Applied Mathematics, or a related field.
• 8+ years of professional backend development experience.
• 3+ years of experience in leadership positions.
• Strong experience with Node.js and modern web development.
• Knowledge of Kubernetes, containers, infrastructure, system design, SQL, and NoSQL databases.
• Experience with RESTful APIs, message brokers, 3rd party integrations, and secure development practices.
• Familiarity with CI/CD, microservices, cloud-based development, and test-driven development is a plus.
• Deep understanding of data structures, coding patterns, and algorithms.
• Experience with agile methodologies, ideally Scrum.
• Excellent problem-solving, diagnostic, and troubleshooting skills.
• Strong leadership, organizational, and mentoring abilities.
• Upper-intermediate or advanced English.

✅ We offer excellent benefits, including but not limited to:

🧑🏻‍💻 Learning and development opportunities and interesting challenging tasks;

✈️ Relocation package (tickets, staying in a hotel for 2 weeks);

🏋️‍♂️ Company fitness corner in the office for employees;

📚 Opportunity to develop language skills and partial compensation for the cost of language classes;

🎁 Birthday celebration present;

🏝 Time for proper rest and 23 working days of Annual Vacation;

Join BrainRocket and rock with us! 🚀

Bold moves start here. Make yours. Apply today! 

We are evolving very quickly and now we’re looking for active and motivated Back-end developer to join our friendly team. 

Required Technologies / Frameworks: 
NestJS
Socket.IO
Swagger
Mongoose
MongoDB
Docker

Requirements:
2+ years of software development experience;
1+ years of experience with Node.js and NestJS;
Strong understanding of OOP principles and modern development practices;
Experience with Git;
Willingness to learn and grow with new technologies.

Responsibilities:
Developing new features for our products;
Maintaining and improving existing services;
Working with APIs and integrations;
Ensuring code quality and compliance with standards.

We offer:
Comfortable office in center of the city;
Competitive salary based on experience;
Paid sick leave;
24 days paid holiday. 

Test task required for the position. 

Just send your CV!

We are looking for a Senior Backend Developer to help build and scale the core infrastructure behind trading, payments, custody and client onboarding processes.

This role is ideal for an experienced engineer who enjoys solving complex backend challenges, building scalable systems and contributing to products operating in a regulated fintech environment. You will work closely with product and engineering teams, helping accelerate product delivery and improve critical platform components.

.    Our expectations:
 

• 5+ years of experience in Backend Development.
• Strong commercial experience with Node.js and TypeScript.
• Experience working with SQL databases such as PostgreSQL or MySQL.
• Experience designing and developing scalable APIs, integrations and backend services.
• Understanding of software architecture, performance optimisation and system scalability.
• Experience working with AWS, Docker and CI/CD pipelines.
• Solid understanding of database design, migrations and data integrity principles.
• Experience participating in code reviews and maintaining high code quality standards.
• Strong problem-solving skills and ownership mindset.
• English level — Upper-Intermediate or higher.

     Nice to have:
 

• Experience in FinTech, Crypto, Web3 or other regulated environments.
• Experience working with trading platforms, financial infrastructure or transaction-processing systems.
• Experience with blockchain integrations, wallet infrastructure or custody solutions.
• Experience with payment provider integrations.
• Experience with reconciliation or ledger-based systems.
• Experience with Kubernetes.

• Understanding of operational resilience, security and compliance requirements within financial products.

  
  What you will do:
   

• Develop and maintain backend services and platform components supporting trading, payment and operational workflows.
• Implement new backend functionality using Node.js, TypeScript, and SQL databases.
• Develop APIs, integrations and internal tools while following clean code principles and maintaining high standards of code quality and maintainability.
• Design and maintain database structures, migrations and data processing workflows.
• Collaborate closely with Product, Engineering and other stakeholders to deliver business requirements.
• Contribute to improving system performance, scalability and reliability.
• Support CI/CD processes, software releases, troubleshooting activities and participate in code reviews.

     Tech Stack:
 

• Node.js
• TypeScript
• PostgreSQL / MySQL
• AWS
• Docker
• Kubernetes
• CI/CD
  
  What we offer:
   
• Fully remote position.
• Flexible working hours with a 40-hour workweek.
• Collaboration with an international team operating within the Helsinki timezone (EET/EEST — the same as Kyiv time).
• Structured onboarding program (4–6 weeks) led by senior business and technical stakeholders.
• Comprehensive healthcare and vacation benefits in accordance with Finnish employment regulations.
• Merit-based career growth and compensation review process.
• Opportunity to work on innovative fintech and infrastructure products with real business impact.
• Long-term career development aligned with your professional ambitions.

.    Employment Details:
 

• Full-time
• Remote
• Probation period: 6 months
• English-speaking environment

We are seeking an energetic, multi-talented VoIP Software Engineer who is excited by complex technical challenges and motivated by building high-quality communication products. You will be a core contributor to our business phone system, designing and implementing new features across multiple product areas, from SIP infrastructure to integrations with external services. 

This role combines deep VoIP expertise with strong software development skills in modern web technologies. 
 

Responsibilities 

• Design, develop, and maintain VoIP services and components for our SIP-based platform. 
• Implement and enhance integrations with external systems, including third-party APIs. 
• Analyse, troubleshoot, and resolve complex SIP/RTP/WebRTC issues to ensure high call quality and reliability.  
• Apply secure software design and development principles across all layers of the stack. 
• Develop and maintain RESTful APIs and related backend services. 
• Conduct testing and optimize performance and scalability. 
• Support the team in defining, improving, and enforcing secure development processes and policies. 
   

Required Skills & Experience 

• Bachelor’s degree in Telecommunications, Computer Science, or a related programming/engineering field. 
• Solid experience as a VoIP developer/engineer working with SIP-based platforms. 
• Strong hands-on experience with Kamailio and Asterisk (design, scripting, configuration, and troubleshooting). 
• Deep understanding of SIP and related protocols: TLS, SDP, RTP/SRTP/RTCP, ICE, WebRTC. 
• Good experience with FreeSWITCH and/or FreePBX 
• Experience in monitoring with tools such as Grafana, Zabbix, Loki (or similar). 
• 3+ experience with Node.js \ python and Express.js (or similar Node frameworks). 
• Experience designing and building REST APIs.
• Hands-on experience with relational databases (RDBMS) such as MySQL and PostgreSQL. 
• Strong background working in Linux environments (system administration basics, networking tools, shell scripting is a plus). 
• Git and standard CI/CD workflows. 
• Experience with AWS services ( EC2,S3, AWS cli, ECS, ALB, ERC) a plus 
• Knowledge and experience with Message brokers (SQS, RabbitMQ). 
• Ability to work independently as well as effectively collaborate within a team. 
• Strong self-learning skills and willingness to stay current with VoIP and software development technologies. 
• Good problem-solving abilities and a structured approach to debugging and troubleshooting. 

Probation period: 3 months

Work equipment: Yes

Inception-1 is a product company that creates AI-driven B2C products designed to help people feel more connected and less alone. Our mission is to build meaningful digital experiences that blend technology with empathy and to prove that technology can be both human and transformative.

We’re looking for a Senior Product Engineer who combines strong engineering skills with product thinking. 

Have you ever wondered about solving real product cases instead of just coding and approving each idea with product-analytics-delivery-….?

We want you to be responsible for solving complex user’s problems – delivering ready-to-use features and final value to user (from ideation to deployment and analysis).

If you have technical strong technical background, AI evangelist mindset and own startup experience – you are already in.
 

Must-have skills:

• Proven ability to ship user-facing features end-to-end.
• Strong full-stack engineering background (Python, Node.js, React, JavaScript).
• Hands-on experience integrating LLMs / AI APIs.
• Hands-on experience with agentic engineering: practical use of AI agents (LLM-based tools, autonomous workflows, coding agents) in day-to-day development, including designing, orchestrating, and evaluating agent-driven workflows.
• Product development skills:
  • Strong grasp of product analytics;
  • Product features design and testing experience.
• Solid system design fundamentals.
   

Nice-to-have:

• Experience in mental health, wellbeing, or health-tech.
• Experience building consumer mobile apps.
• Experience working with experimentation frameworks
   

Key responsibilities for the first 6 months:

• Ship 15–20 meaningful product experiments.
• Implement agile but stable solutions for engaging conversational model, voice generation, interactive calls, etc.
• Improve retention and activation metrics.
• Design and maintain an experimentation framework (A/B testing, rapid iteration).
• Work as product, design, and research to turn insights into shipped features.
• Participate in user interviews and discovery sessions
   

What makes you successful in this role:

• You have a strong product mindset and take ownership from idea to impact.
• You’re comfortable working in ambiguity and early-stage environments.
• You have high emotional intelligence and empathy for users.
• You care not only about shipping fast, but about shipping the right thing.
   

What we offer:

• Flexible work schedule and remote-friendly culture.
• Online services of a corporate doctor, and after the probationary period — health insurance in Ukraine.
• 20 working days of paid vacation per year, unlimited sick leave.
• All equipment necessary for work.
• Compensation for the best courses on the market, corporate online meetups and lectures, a large library, business and management schools for employees.

Please note: due to the high volume of applications, we can only respond to candidates selected for the next stage. If you don’t hear from us within a week, please assume your application won’t be moving forward this time, and we’d love to see you apply for future roles!

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 should you have any questions!

Best regards,

Universium Team ❤️

We are looking for a proactive Middle Fullstack Engineer to join our team.

Responsibilities:

• System design: database schemas, sequence diagrams, API
• Development of full-stack features with SPA/SSR on frontend and REST API on backend
• Implementation of test coverage
• Code review and team collaboration to produce high quality product
• Proactive monitoring of services through logging, metrics and alerting tools
• Configuration of CI/CD pipelines

Requirements:

• 3+ years of experience as NodeJS Fullstack Engineer
• Experience with TypeScript
• Experience with Next.js, React
• Experience with Nest.js
• Experience with REST API
• Experience with CI/CD: Docker, Helm, BitBucket/GitHub/GitLab
• Experience with PostgreSQL
• Experience with Redis
• Experience with RabbitMQ/Kafka
• Experience with Claude/Codex

Requirements

• 4+ years of commercial software development experience, including 3+ years working with Node.js and TypeScript;
• Strong understanding of Object-Oriented Programming, software design principles, and backend architecture;
• Solid experience with relational and NoSQL databases (PostgreSQL, Redis);
• Experience with message brokers such as RabbitMQ or Kafka;
• Experience with Docker and containerized environments;
• Strong SQL skills and experience in query optimization;
• Experience with REST API design and API documentation tools (Swagger/OpenAPI);
• Experience with monitoring and observability tools (Prometheus, Grafana);
• Solid experience writing unit and integration tests;
• Basic Linux administration and troubleshooting skills;
• Experience with Git and modern development workflows;
• Experience working with CI/CD pipelines;
• Ability to design scalable, maintainable, and high-performance backend solutions;
• Upper-Intermediate or higher English level;
• Strong communication skills, ownership mindset, and ability to work effectively within a team.

Would Be a Plus

• Experience with Kubernetes;
• Experience with Cassandra or other distributed databases;
• Good understanding of common software design patterns and architectural approaches;
• Experience conducting code reviews and mentoring other developers;
• Experience using AI-powered development tools (GitHub Copilot, ChatGPT, Cursor, Claude, etc.) to improve development efficiency.

Responsibilities

• Design, develop, and maintain backend services using Node.js and TypeScript;
• Implement software components according to technical and business requirements;
• Participate in system integration, testing, troubleshooting, and performance optimization;
• Write and maintain unit and integration tests to ensure software quality;
• Participate in architecture discussions and technical decision-making;
• Conduct code reviews and contribute to maintaining high engineering standards;
• Collaborate closely with developers, QA engineers, product managers, and other stakeholders;
• Participate in effort estimation, sprint planning, and delivery activities;
• Contribute to building scalable, reliable, and maintainable solutions;
• Support continuous improvement of development processes, tools, and best practices;
• Mentor less experienced team members when needed.

About the Company

Digis is a European IT company (part of Fiverr) with 200+ specialists delivering high-load SaaS platforms, enterprise solutions, and cloud-native products for clients worldwide. We build long-term engineering teams and ensure transparency, stability, and professional growth for every talent.

About the Client & Project

The company helps hotel chains like Hilton and Marriott transform front-desk staff into revenue generators through upselling training and analytics. Their IN-Gauge SaaS platform empowers frontline teams across 2,000+ properties in over 100 countries.

Requirements

• 3+ years of experience with Node.js
• 1+ year of experience with AWS (recent project)
• 1+ year of robust API integration experience (recent project)
• English level: Upper-Intermediate (B2+)

Responsibilities

• Integrating hotel APIs into the client platform
• Transforming external datasets into internal platform-ready formats
• Building lightweight services for scheduled data synchronization
• Handling unreliable or inconsistent third-party data sources

Why this project is exciting

• A global company with a platform managing over 700,000 hotel rooms in 124 countries, helping clients generate billions in revenue.
• Well-known project: stable cooperation, we have 4 people from Digis there
• Broad engineering ownership: diverse responsibilities with room to grow across integrations, data flows, and solution design
• High autonomy & influence: engineers are encouraged to take initiative, propose improvements, and directly shape technical decisions
• Business impact: your work directly increases hotel revenues.
• Work with major clients: partner with leading global hotel brands.
• Fast, measurable results: projects deliver clear and tangible business value.

We offer:

• Paid 20 vacation days per year
• Paid 5 sick leaves per year with no medical documents needed
• Personalized development plan supported by properly set personal self-development goals
• Compensation for subject-matter trainings
• Worktools (PC, laptop, monitor) and workplace arrangement, if needed
• Assistance in choosing and compensation for English courses
• 100% horizontal in-company organization and communications
• Possibility to switch between projects and technologies within the company
• Accounting support
• Free corporate psychologist services

BrainRocket is a global company creating end-to-end tech products for clients across Fintech, iGaming, and Marketing. ‍Young, ambitious, and unstoppable, we've already taken Cyprus, Malta, Portugal, Poland, Spain and Serbia by storm. Our BRO team consists of 1,500 bright minds creating innovative ideas and products. We don’t follow formats. We shape them. We build what works, launch it fast, and make sure it hits.

We’re looking for a Senior Node.js Developer to join our development team in Lisbon, Portugal. You’ll help build a next-generation payment integration platform that connects businesses with multiple financial service providers through scalable, secure APIs.

✅ Responsibilities:

✔️ Design, implement, and optimize robust solutions to enhance our proprietary payments platform, ensuring high performance, scalability, and security.
✔️ Develop and maintain complex integrations with payment providers, banks, and other third-party systems, ensuring seamless data flow and alignment with technical and regulatory requirements.
✔️ Actively participate in all stages of creating new features, from initial concept and technical design to implementation and final delivery.
✔️ Contribute to the development and ongoing evolution of our fintech payments solution, ensuring innovation and adaptability to market needs.
✔️ Collaborate in agile development cycles with bi-weekly sprints, utilizing practices such as SCRUM, grooming, and sprint planning to consistently deliver product value.
✔️ Identify opportunities for technical and process improvements, driving efficiency and innovation throughout the software lifecycle.
✔️ Work closely with design, product, and business teams to ensure features meet user expectations and support business objectives.

✅ Requirements:

✔️ 5+ years of commercial experience in web development.
✔️ 4+ years of hands-on experience with Node.js.
✔️ Solid experience with NextJS, NestJS, Apollo, and Material UI.
✔️ Strong proficiency in TypeScript.
✔️ Commercial experience working with high-load SQL or NoSQL databases.
✔️ Familiar with REST, GraphQL, and WebSockets.
✔️ Understanding of TDD and writing effective automated tests.
✔️ Experience with microservice architecture principles.
✔️ Proficient with Git version control workflows.
✔️ Hands-on experience with RabbitMQ and Redis.
✔️ Experience with MongoDB and MySQL.
✔️ Advanced level of English, both written and spoken.

✅ We offer excellent benefits, including but not limited to:
🧑🏻‍💻 Learning and development opportunities and interesting, challenging tasks. 
✈️ Relocation package (tickets, staying in a hotel for 2 weeks). 
🏋️‍♂️ Company fitness corner in the office for employees. 
📚 Opportunity to develop language skills and partial compensation for the cost of language classes. 
🎁 Birthday celebration present. 
🏝 Time for proper rest and 24 working days of Annual Vacation. 

Bold moves start here. Make yours. Apply today! 

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

🌟 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

• 5+ 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

Project Overview:

We are seeking a Senior Backend Engineer with strong expertise in Node.js, TypeScript, and AWS Lambda to build a decoupled serverless application. The role focuses on implementing plan management endpoints with Fastify and ts-rest, designing a SQL Server schema with Prisma migrations, and building a deterministic calculation engine covering forecasts, SMV, derived metrics, and goal deltas — while integrating internal APIs with caching, retries, and circuit-breaker patterns, wiring the full AWS infrastructure via Serverless Framework, and ensuring quality through thorough unit and integration tests.

Customer Overview:

USA influencer marketing platform for organizations looking to advance their creator marketing. Its enterprise-grade technology and industry-leading intelligence facilitate scaled creator discovery, streamlined workflows, and robust reporting, while ensuring compliance and brand safety.

Responsibilities:

• Implement plan and plan-item endpoints with Fastify + ts-rest, validated by Zod schemas shared with the frontend.
• Build the deterministic calculation engine (forecast → adjustment → SMV → derived metrics → totals → goal deltas), including BRD edge cases (Twitch avg_concurrent_views, payout exclusivity, missing-data defaults).
• Design the SQL Server schema and Prisma migrations; ensure reviewable raw-SQL output for the DBA team.
• Build adapters for Lists/Collections and Campaign Service with caching, fallbacks, circuit-breaker, and structured error handling.
• Integrate AWS infrastructure (API Gateway, Lambda, RDS, ElastiCache, Secrets Manager, S3) via Serverless Framework; wire Coralogix logs/metrics/traces.
• Write thorough unit and integration tests, especially around the calc engine; pass Trivy + SonarQube gates in CI.
   

Skills/Requirements:

• 4+ years with Node.js and TypeScript in production backend services.
• Hands-on AWS Lambda + API Gateway, comfortable with serverless tradeoffs (cold starts, 30s/10MB limits, concurrency).
• Experience with Prisma (or comparable ORM) and a relational database; SQL Server experience a plus.
• Strong API design background — REST + JSON Schema/Zod/OpenAPI — and integration patterns (caching, retries, circuit breakers).
• Comfortable with Serverless Framework / IaC and GitLab-style CI/CD.

Nice to have:

• Fastify and ts-rest experience specifically.
• Background in calculation/forecasting engines or financial/analytics computations.
• Familiarity with Coralogix or comparable APM/log platforms.

We are looking for a Middle Node.js Developer for a short-term freelance project focused on integrating Salesforce with the Anthropic Claude API.

About the project

The goal is to build a server-side integration between Salesforce and the Claude API.

Salesforce will send HTTP requests to a Node.js server. The server will retrieve data from Salesforce, send it to Claude API, process the structured JSON response, and write the result back to Salesforce.

This is an API integration project, not AI model development.

Responsibilities

• Build and maintain a REST API using Node.js and Express.js.
• Integrate the server with Salesforce via REST API or jsforce.
• Integrate Anthropic Claude API.
• Implement structured JSON responses, validation, and fallback logic.
• Add logging for requests, responses, and errors.
• Read and update markdown documents stored in Salesforce ContentDocument.
• Keep business logic in separate /lib modules while keeping route handlers thin.
• Work with GitHub, feature branches, pull requests, and GitHub Actions.
• Maintain separate configurations for UAT and PROD environments.
• Prepare concise technical documentation for handover to the team.

Requirements

• 3+ years of commercial experience with Node.js.
• Strong knowledge of Express.js, async/await, and error handling.
• Experience building and integrating REST APIs.
• Hands-on experience with Anthropic Claude API or OpenAI API.
• Experience with structured outputs, system prompts, JSON parsing, and validation.
• Confident use of Git, feature branches, and pull requests.
• Basic understanding of GitHub Actions.
• Experience with .env, secrets, and multi-environment configurations.
• Written English sufficient for technical documentation and code comments.
• Strong attention to detail and ability to work independently.

Nice to have

• Experience with Salesforce REST API or jsforce.
• Basic knowledge of SOQL.
• Experience with MCP protocol.
• Background in financial services or other regulated industries.
• Understanding of logging, audit trails, and edge-case handling.

Not required

• Salesforce Admin or Salesforce Developer experience.
• Advanced DevOps knowledge.
• AI/ML background.

A Salesforce Developer is already part of the team and will own the Salesforce-side work. We expect the Node.js Developer to deliver a reliable server-side integration with clean code structure and robust error handling.

Технологічний стек

Node.js (TypeScript, NestJS)
REST API / WebSocket
PostgreSQL, Redis
ClickHouse / TimescaleDB (аналітика та історичні дані)

Blockchain SDKs:
viem
ethers
web3.js
TronWeb
Solana Web3.js

Wallet Infrastructure:
MPC Wallets
Embedded Wallets
Custodial / Non-Custodial Solutions
Privy, Turnkey, Fireblocks, аналогічні рішення

Payment Infrastructure:
Visa / Mastercard integrations
Card Issuing Platforms
PSP Integrations
Background Workers / Queues
Docker, Kubernetes, GitHub Actions, CI/CD

Monitoring:
Prometheus
Grafana
OpenTelemetry


Задачі
Розробка та розвиток backend-сервісів для криптогаманців та платіжної інфраструктури
Інтеграція та підтримка EVM-мереж:
Ethereum
Polygon
Arbitrum
Base
BNB Chain

Інтеграція та підтримка:
Solana
Tron
Розробка систем депозитів та виведення коштів

Побудова сервісів:
балансів
транзакцій
історії операцій
внутрішніх переказів

Розробка та підтримка wallet infrastructure:
MPC wallets
embedded wallets
custodial / non-custodial wallets

Інтеграція платіжних карт:
Visa
Mastercard
card issuing providers
Інтеграція PSP та fiat on/off-ramp провайдерів
Реалізація моніторингу транзакцій та статусів платежів у режимі реального часу

Побудова систем індексації блокчейнів:
RPC polling
WebSocket subscriptions
обробка ончейн-подій
Забезпечення консистентності між ончейн та офчейн станом
Розробка API для мобільних застосунків, веб-платформи та внутрішніх сервісів
Проєктування високонавантажених та відмовостійких сервісів
Оптимізація продуктивності БД та високонавантажених систем
Code Review та участь у технічних рішеннях команди


Вимоги

Senior Backend Engineer з production-досвідом у Web3 та платіжній інфраструктурі
4+ років комерційного backend-досвіду
Впевнений Node.js та TypeScript у production
Практичний досвід роботи з:
Ethereum та EVM chains
Solana
Tron
Досвід розробки wallet infrastructure

Розуміння:
account abstraction
smart wallets
MPC wallets
embedded wallets

Практичний досвід:
індексації блокчейнів
роботи з RPC nodes
обробки ончейн-подій
побудови transaction monitoring
Досвід інтеграції платіжних карт або card issuing платформ

Розуміння процесів:
card authorization
card settlement
chargebacks
transaction lifecycle

Досвід побудови сервісів:
депозитів
виведення коштів
внутрішніх переказів
балансів

Досвід проєктування мікросервісної архітектури
Сильні навички PostgreSQL та Redis
Досвід роботи з highload системами
Web3 production-досвід — обов’язковий

Буде плюсом

Досвід роботи з:
Privy
Turnkey
Fireblocks
ZeroHash
Bridge
Stripe Issuing
Galileo
Marqeta
Досвід запуску криптокарт та card programs
Досвід роботи з AML/KYC провайдерами
Розуміння PCI DSS
Досвід роботи з міжнародними платіжними системами
Досвід інтеграції fiat on/off-ramp рішень
Досвід роботи з DeFi-протоколами та DEX-інфраструктурою