Backend Developer (Node.JS)

🏢 Summary: 12-month B2B contract for a Frontend Developer to build and enhance mobile and web features for a flagship cashback/loyalty application in a fast-paced Agile environment. The role focuses on React Native and React development for customer-facing apps and requires collaboration with US-based teams during CET afternoon hours. 🗂️ Requirements: 5+ years experience with React Native and React, Experience with GraphQL, Experience building customer-facing mobile and web apps, Experience with apps published on iOS and Android stores, Experience working in Agile teams, Availability to work 2pm–10pm CET 📃 Skills: React, ReactNative, GraphQL, TypeScript, Node.js, PostgreSQL, GCP, Redis, Docker, Kafka, Apollo, CI/CD 🏢 Description: Our client - a fast-growing US-based fintech - is looking to hire 2 strong Frontend Developers to help on an initial 12-month B2B contract, to work remotely. You will be working in an Agile team, dedicated to working on new features and products related to the companies flagship Cashback / Loyalty application. This will be a dynamic and fast-paced environment, working on both mobile and web apps. You must be comfortable working from 2pm-10pm CET, in order to have full consistency with the US teams. Requirements: 5+ years of experience working with React Native / React Familiarity with GraphQL Strong experience working with customer-facing mobile and web apps (B2C), that are live on iOS / Android stores Strong ability to work in agile teams, with good communication skills Experience with the following is not necessary , but are part of the wider tech stack and so any supplementary knowledge could be helpful: Typescript, Node.js, PostgreSQL, GCP, Redis, Docker, Apache Kafka, Apollo GraphQL, CI/CD tools

🏢 Summary: Backend Developer role focused on modernizing and transforming legacy sales systems using Node.js and .NET technologies. The position involves building and maintaining APIs, developing databases, and contributing to an event-driven architecture in an AWS-based environment. The role combines hands-on backend development with active participation in deployment processes and system evolution. 🗂️ Requirements: 5-6 years of recent Node.js development experience, 2-3 years of recent .NET development experience, Experience building and maintaining APIs, Experience with PostgreSQL and DynamoDB databases, Experience working with event-driven architecture, Experience with AWS services, Ability to write modern, testable, high-quality code, Experience with deployment automation and CI/CD pipelines 📃 Skills: Node.js, TypeScript, JavaScript, .NET, AWS, Lambda, DynamoDB, RDS, ECS, CDK, PostgreSQL, Kafka, EventBridge, GitLab, CI, Docker, Localstack 🏢 Description: We're seeking an experienced & energetic Backend Developer specializing in TypeScript/JavaScript/.NET to enhance the global Sales ecosystem. This role focuses on transforming backend systems, emphasizing proactive development and team empowerment. Candidates should bring a blend of Node.js and .NET expertise to the table, along with a collaborative spirit and a commitment to writing modern, testable code. Our Client’s team, comprising about 25 individuals, is modernizing legacy systems to fulfill local market needs while improving our processes continually. If you're motivated by challenges and have a passion for creating high-value solutions, we want to hear from you! What we offer: Rate: 40-45 euro/h +VAT Remote role B2B Contract Main Responsibilities: Drive initiatives and collaborate with team members on larger projects. Fix bugs and implement smaller enhancements across the application. Participate in creating and maintaining APIs using AWS services. Develop and improve databases with a focus on PostgreSQL and DynamoDB. Contribute to an event-driven architecture utilizing Kafka and AWS EventBridge. Manage deployment processes using AWS CDK and GitLab CI. Support legacy system maintenance and modernization. Key Requirements: At least 5-6 years of recent experience as a Node.js Developer. 2-3 years of recent experience with .NET. Energetic and inspiring personality who thrives on challenges. Hands-on work ethic in collaboration with team members. Proficiency in writing modern, testable, and high-quality code. Natural inclination towards evolutive maintenance. Nice to Have: AWS experience (Serverless Lambda, DynamoDB, RDS, ECS, AWS CDK). Knowledge of Localstack. Experience with Docker. Other Details: This position allows for team activities at least twice per year in Sweden, with a focus on modernizing our legacy systems into proactive, quality-focused solutions. Join a team of about 25 members dedicated to driving transformative change in our sales ecosystem.

🏢 Summary: B2B contract role for a Mid/Senior Node.js Developer focused on building and maintaining backend systems such as SaaS platforms, cloud-native applications, microservices, and event-driven architectures. The position involves architectural decision-making, backend development, and close collaboration with QA and DevOps in international projects. Candidates will work with modern cloud environments and have real impact on system design and product development. 🗂️ Requirements: 4+ years of backend development experience, Strong knowledge of Node.js, Experience with TypeScript or JavaScript, Experience with SQL databases, Experience with NoSQL databases, Understanding of microservices architecture, Understanding of serverless architecture, Understanding of event-driven systems, Hands-on experience with GCP, AWS, or Azure, Ability to write clean and maintainable code, Experience with unit and integration testing, English level minimum B2 📃 Skills: Node.js, TypeScript, JavaScript, SQL, NoSQL, GCP, AWS, Azure, REST, Docker, Microservices, Serverless, Testing 🏢 Description: We are a software house delivering long-term projects for international clients , and we are looking for Mid / Senior Node.js Developers to join our team on a B2B contract . You will work on various backend-focused projects , such as SaaS platforms, cloud-native systems, microservices, and event-driven architectures. We match projects to your experience and technical preferences, and you will have a real impact on architecture and product development. Responsibilities design, develop, and maintain backend services using Node.js (TypeScript / JavaScript) implement new features and improve existing functionalities participate in technical and architectural decision-making refactor and optimize key components of the system ensure code quality through clean code practices and testing collaborate closely with developers, QA, and DevOps engineers Requirements 4+ years of experience in backend development strong knowledge of Node.js (TypeScript / JavaScript) experience with SQL and NoSQL databases good understanding of cloud-based architectures (microservices, serverless, event-driven systems) hands-on experience with at least one cloud provider ( GCP, AWS, or Azure ) ability to write clean, well-structured, and maintainable code proactive mindset and willingness to grow technically good communication skills and English level min. B2B Example Tech Stack (depends on the project) Node.js / TypeScript Cloud platforms: GCP, Azure or AWS REST APIs & asynchronous communication SQL & NoSQL databases Docker Unit and integration testing

🏢 Summary: Full-time Backend Developer role focused on building and maintaining scalable Node.js and TypeScript applications for US clients across various industries, including MVP-stage products. The position involves designing backend architecture, working with SQL/NoSQL databases, and collaborating in Scrum teams in a flexible, remote-first environment. The offer includes long-term cooperation and participation in diverse, technically challenging projects. 🗂️ Requirements: 2+ years commercial experience in Node.js, Experience with Node.js frameworks (Express.js, NestJS or similar), Strong proficiency in TypeScript, Experience with SQL databases, Experience with NoSQL databases, Knowledge of SOLID and KISS principles, Knowledge of design and architecture patterns, Experience with Docker, Experience with GitHub Actions, Basic experience with AWS services, Ability to use ORM or query builders (e.g. Prisma, Knex), English level B2, Polish level C1 📃 Skills: Node.js, TypeScript, JavaScript, Express, NestJS, Fastify, SQL, NoSQL, Prisma, Knex, Docker, AWS, GitHub, GitHubActions, React 🏢 Description: We are looking for skillful Backend Developers to join one of our teams working with US clients - referrals from the high-end American IT market. Our tech stack is built around React, Node.js and TypeScript. We are working with well-established companies and sometimes startups in their early stages (MVPs), which makes the job full of diversity and exciting challenges while crafting cutting-edge solutions. Enjoy the flexibility of working within the Polish time zone and collaborate with clients from diverse industries such as FinTech, SportsTech, MedTech, and many others. Required skills: 2+ years of commercial experience in Node.js, SQL and NoSQL DBs, knowledge of JS frameworks (e.g Express.js, NestJS), experience in TypeScript, SOLID and KISS, knowledge about design and architecture patterns, know how and why Docker and GitHub Actions works, basic usage of AWS services, English B2, Polish C1 Offer: B2B/UZL, paid days off, 100% remote (or hybrid/onsite - as you prefer), Polish time zone, flexible hours, full-time position, long-term contract, Scrum Teams Perks and Benefits: Budgets for self-development, integrations, healthcare & sport activities, Mentoring Program, Individual Career Path, Paid Time Off, Paid Health Break & more Tools you'll use: Apple MacBook Pro, Slack, GSuite, GitHub, Jira, Coda, FigJam Your future tasks and duties: Writing readable and easy-to-maintain JS/TS code with OOP flavor Writing documentation for delivered code Code review of other developers in the team Direct involvement with the design and modification of basic DB structures Propose improvements and share proactive ideas/solutions with the team to enhance the team's work processes Share insights with the team to diagnose issues and focus on solutions Actively participate in project discussions Listen to the client's needs and, after consulting the team, suggest solutions Support less experienced team members About you - Tech skills & Experience: 2+ years of commercial experience in Node.js Good experience with at least one Node.js backend framework (e.g. Express.js, NestJS, Fastify, etc) - you know most of its basic APIs/features, worked on at least 1-2 projects involving such technologies Strong proficiency in TypeScript. You have practical experience with static typing, advanced types, and configuring TS compilers, treating it as your primary language to build robust and type-safe backend applications Potentially worked with NoSQL databases and/or in-memory databases and utilized them as a data store Worked with SQL databases (integration-wise and as a basic design skill) with ORM or query builder tool (ie. Prisma, Knex) Knows the basics of building AI applications (RAG, Agents, etc.) Use AI effectively in their work About you - Soft Skills: English level B2 to cooperate with American clients Polish level C1 to communicate easily within the team Open-minded to new challenges (e.g. different frameworks) Understand the significance of MVP and prioritize the pursuit of excellence and high-quality outcomes, even amid tight project timelines. Communicate with the team to efficiently translate business complexities (user stories/tasks) into solutions (results/estimations) Staying on top with trends/news, sharing them, teaching others and aiming for the best quality solutions Strong problem-solving abilities to diagnose issues, suggest solutions, and make decisions based on project requirements Nice to have: Worked in Agile/Scrum on a daily basis consisting of people with similar skills and monitoring code quality on a daily basis Basic experience with AWS - used some services in specific cases Basic experience with Docker - know how to prepare and debug the environment and connect things up to work locally Worked in the very beginning of the product development/creation stage Understand the significance of MVP and aim to deliver top-notch results, even amid tight project timelines Recruitment process: CV Review Phone call with our Recruiter (15min) Soft-skills interview with our Recruiter (1h) Technical interview with our Specialists (2h) Decision and feedback 🥳 Meaningful projects, top-notch experts and value-driven workplace Sound good? Apply now!

🏢 Summary: Backend Developer role focused on modernizing and transforming legacy sales systems using Node.js and .NET technologies. The position involves building and maintaining APIs, databases, and event-driven architectures within AWS, while supporting deployment and continuous improvement processes. The role emphasizes proactive development, high-quality testable code, and collaboration on large-scale backend initiatives. 🗂️ Requirements: 5-6 years experience with Node.js, 2-3 years experience with .NET, Strong proficiency in TypeScript and JavaScript, Experience building and maintaining APIs, Experience with PostgreSQL and DynamoDB, Experience with event-driven architecture, Experience with AWS services, Ability to write modern, testable, high-quality code, Experience with CI/CD pipelines, Experience maintaining and modernizing legacy systems 📃 Skills: Node.js, TypeScript, JavaScript, .NET, AWS, Lambda, DynamoDB, PostgreSQL, RDS, ECS, Kafka, EventBridge, CDK, GitLab, CI, Docker, Localstack 🏢 Description: We're seeking an experienced & energetic Backend Developer specializing in TypeScript/JavaScript/.NET to enhance the global Sales ecosystem. This role focuses on transforming backend systems, emphasizing proactive development and team empowerment. Candidates should bring a blend of Node.js and .NET expertise to the table, along with a collaborative spirit and a commitment to writing modern, testable code. Our Client’s team, comprising about 25 individuals, is modernizing legacy systems to fulfill local market needs while improving our processes continually. If you're motivated by challenges and have a passion for creating high-value solutions, we want to hear from you! Main Responsibilities: Drive initiatives and collaborate with team members on larger projects. Fix bugs and implement smaller enhancements across the application. Participate in creating and maintaining APIs using AWS services. Develop and improve databases with a focus on PostgreSQL and DynamoDB. Contribute to an event-driven architecture utilizing Kafka and AWS EventBridge. Manage deployment processes using AWS CDK and GitLab CI. Support legacy system maintenance and modernization. Key Requirements: At least 5-6 years of experience as a Node.js Developer. 2-3 years of experience with .NET. Energetic and inspiring personality who thrives on challenges. Hands-on work ethic in collaboration with team members. Proficiency in writing modern, testable, and high-quality code. Natural inclination towards evolutive maintenance. Nice to Have: AWS experience (Serverless Lambda, DynamoDB, RDS, ECS, AWS CDK). Knowledge of Localstack. Experience with Docker. Other Details: This position allows for team activities at least twice per year in Sweden, with a focus on modernizing our legacy systems into proactive, quality-focused solutions. Join a team of about 25 members dedicated to driving transformative change in our sales ecosystem.

🏢 Summary: Remote Senior Backend Node.js Developer role focused on building and scaling an event-driven microservices trading platform. The position involves end-to-end development, collaborating across product, QA, and DevOps to deliver high-performance, scalable trading solutions. B2B contract with overlap required with NYC working hours. 🗂️ Requirements: Bachelor’s Degree in Computer Science or related field, 3-5 years professional web application development experience, Expert-level Node.js knowledge, Expert-level TypeScript knowledge, Experience with distributed systems, Experience with Apache Kafka, Redis, Kubernetes, MongoDB, Experience with automated unit testing and TDD, Strong understanding of performance optimization and computational complexity, Knowledge of algorithms and design patterns, Fluent English (written and spoken) 📃 Skills: Node.js, TypeScript, Kafka, Redis, Kubernetes, MongoDB, Microservices, TDD, Algorithms, DesignPatterns, Web, DistributedSystems 🏢 Description: We are looking for a performance-driven backend Senior Node.js Developer who can help us bring our client's trading solutions to the next level of functionality, scalability, and user experience. They are actively developing a new event-driven microservices architecture to form a foundational platform for delivering new trading applications. You will be responsible for delivering software end-to-end , from liaising with product managers and designers, to coordinating across international development teams on engineering and architecture to working with QA and DevOps teams - all ultimately to deliver a quality, innovative product to the traders and investors who depend on the platform every day. Requirements: Fluent English language [both written and spoken] Education: at least Bachelor's Degree, preferably in Computer Science 3-5 years' professional web application development experience Expert-level Node.js and TypeScript knowledge, and curiosity to learn more Broad knowledge of web platform and technologies Superior analytical and problem-solving ability Effective communication skills to work with different teams across an international company Experience with modern distributed systems and infrastructure technologies, including Apache Kafka, Redis, Kubernetes, and MongoDB Automated unit testing and test-driven development Robust understanding of performance issues, computational complexity, and code optimization. Familiarity and implementation of industry-standard algorithms and design patterns Proactive and team player who can deliver in a high-pressure demanding environment Nest.js – nice to have Offer details: 100% remote job preferrably at least 4-5 hours overlap with NYC working hours B2B contract rate up to 50 USD/h net Don't hesitate and apply now!

🏢 Summary: Senior Backend Node.js Developer role focused on building and scaling an event-driven microservices trading platform. The position involves end-to-end development within a distributed architecture, ensuring high performance, scalability, and code quality. Fully remote B2B contract with overlap with NYC hours. 🗂️ Requirements: 4+ years web application development experience, Expert knowledge of Node.js, Expert knowledge of TypeScript, Experience with distributed systems architecture, Experience with Apache Kafka, Experience with Redis, Experience with Kubernetes, Experience with MongoDB, Experience with automated unit testing and TDD, Strong understanding of performance optimization and computational complexity, Knowledge of algorithms and design patterns, Broad knowledge of web technologies 📃 Skills: Node.js, TypeScript, Kafka, Redis, Kubernetes, MongoDB, Microservices, TDD, Algorithms, DesignPatterns, Web 🏢 Description: We are looking for a performance-driven backend Senior Node.js Developer who can help us bring our client's trading solutions to the next level of functionality, scalability, and user experience. They are actively developing a new event-driven microservices architecture to form a foundational platform for delivering new trading applications. You will be responsible for delivering software end-to-end , from liaising with product managers and designers, to coordinating across international development teams on engineering and architecture to working with QA and DevOps teams - all ultimately to deliver a quality, innovative product to the traders and investors who depend on the platform every day. Requirements: Fluent English language [both written and spoken] Education: at least Bachelor's Degree, preferably in Computer Science 4+ years' professional web application development experience Expert-level Node.js and TypeScript knowledge, and curiosity to learn more Broad knowledge of web platform and technologies Superior analytical and problem-solving ability Effective communication skills to work with different teams across an international company Experience with modern distributed systems and infrastructure technologies, including Apache Kafka, Redis, Kubernetes, and MongoDB Automated unit testing and test-driven development Robust understanding of performance issues, computational complexity, and code optimization. Familiarity and implementation of industry-standard algorithms and design patterns Proactive and team player who can deliver in a high-pressure demanding environment Nest.js – nice to have Offer details: 100% remote job preferrably at least 4-5 hours overlap with NYC working hours B2B contract rate up to 55 USD/h net

🏢 Summary: Short-term B2B contract for a Fullstack Developer (Node.js + TypeScript) to build and maintain backend services for a regulated digital capital market platform in the fintech domain. The role focuses on developing scalable APIs, integrating KYC/AML providers, and implementing authentication, authorization, and investor management features. The project emphasizes code quality, security, and collaboration with cross-functional teams. 🗂️ Requirements: 3+ years commercial experience with Node.js, Strong knowledge of TypeScript, Experience building REST APIs, Experience with NestJS or similar framework, Experience with Prisma ORM or similar ORM, Understanding of authentication and authorization, Experience with relational databases, Experience writing automated tests, Knowledge of clean code principles, English for daily communication 📃 Skills: Node.js, TypeScript, NestJS, Prisma, REST, SQL, Jest, Supertest, Authentication, Authorization 🏢 Description: Description We are a technology company that started its journey in 2008. Our main headquarters is located in the picturesque city of Poznań, nestled by the beautiful Malta lake. For more than 17 years, we have been assisting companies in developing and implementing innovative fintech solutions. Leveraging our expertise in areas such as blockchain, online payments, and more, our clients can invent and develop cutting-edge solutions and services that keep them at the forefront of innovation. FULLSTACK DEVELOPER B2B: 80-100 PLN / hour START - 1 JULY TERM - 6 WEEKS LOCATION: POLAND (REMOTE) *We offer a hybrid work model, allowing you to balance office presence with remote work. However, it's important to note that the role emphasizes a stronger presence in the office to foster teamwork and effective communication. Requirements Key Duties and Services: A Roadmap to Your Professional Success Your Mission : We are looking for a Fullstack Developer (Node. js + TypeScript) to join a fintech project focused on building a regulated digital capital market platform. The system supports investor onboarding, KYC/AML verification, investor classification, access control, audit logging, and digital wallet infrastructure. You will work closely with senior engineers and architects to build scalable backend services and integrations with fintech and blockchain-related providers. Scope of services: Developing and maintaining backend services using Node. js + TypeScript Building and extending REST APIs for onboarding, authentication, and user management Integrating external KYC/AML and identity verification providers Implementing business logic for investor classification and access control Creating and maintaining database models using Prisma ORM Writing unit and integration tests (Jest, Supertest) Participating in code reviews and technical discussions Collaborating with frontend, mobile, QA, and product teams Supporting code quality, security, and system reliability Here’s the set we are required: 3+ years of commercial experience with Node. js backend development Strong knowledge of TypeScript Experience building REST APIs and backend systems Experience with NestJS or similar frameworks Experience with Prisma ORM or similar Understanding of authentication & authorization concepts Familiarity with relational databases Experience writing automated tests (Jest, Supertest or similar) Strong understanding of clean code principles and best practices Good communication skills and English for daily cooperation Nice to have: Experience with class-validator / DTO-based validation Familiarity with GraphQL (Apollo) Experience in fintech / banking / regulated environments Knowledge of KYC/AML processes Exposure to blockchain, wallets, or digital assets Career Advancement at Your Fingertips: Explore Opportunities with Us By joining us you will get: Work on a modern fintech platform with real regulatory requirements Collaboration with experienced senior engineers and architects Opportunity to work with KYC/AML, identity systems, and fintech integrations Influence on system design and backend architecture decision A strong engineering culture focused on quality, security, and scalability Navigating the Hiring Process: What does the recruitment process for that position look like? HR Screening with Talent Acquisition Specialist (30 min) Technical Interview (60 min) Interview with Delivery Manager (30 min) Job Offer

🏢 Summary: B2B contract role for a Backend Developer to build and maintain scalable microservices in an Ad Tech platform using Node.js, Nest.js, and TypeScript. The position focuses on backend architecture, performance, and integration within a fully remote team based in Romania. Initial 6-month project with possible extensions. 🗂️ Requirements: Strong experience with Node.js, Strong experience with Nest.js, Strong experience with TypeScript, Proven experience building scalable backend microservices, Experience with AWS Lambda or serverless frameworks, Experience working in agile teams 📃 Skills: Node.js, Nest.js, TypeScript, AWS, Lambda, Serverless, Microservices, REST, CI/CD, Git 🏢 Description: Backend Developer (Node.js) – Integration & Backend Team Work model : fully remote in Romania Assignment type : B2B Project length : 6 months + extensions. Project language : English. Industry : Ad Tech industry About the Role We are looking for a Backend Developer to join our Integration & Backend team. You will build robust, scalable microservices that power our platform, using Node.js, Nest.js, and TypeScript. Responsibilities Develop and maintain backend microservices using Node.js and Nest.js. Ensure scalability, performance, and reliability across backend systems. Collaborate with frontend teams and product owners to deliver features. Contribute to code reviews, testing, and continuous integration. Support the design and improvement of backend architecture. Key Requirements Strong experience with Node.js, Nest.js, and TypeScript . Proven track record in building scalable backend microservices. Familiarity with serverless frameworks such as AWS Lambda . Experience working in agile teams. Previous experience with SaaS, e-commerce, or Adtech is meritorious.

🏢 Summary: Senior Backend Developer role focused on developing and optimizing a key internal system using NestJS, Node.js, and TypeScript. The position involves full software development lifecycle ownership and automation of CI/CD processes. Strong emphasis on testing, database management, and deployment automation. 🗂️ Requirements: 7+ years commercial backend development experience, 5+ years experience with NestJS, Node.js, TypeScript, Experience in full software development lifecycle, Experience with CI/CD and GitHub Actions, Proficiency with PostgreSQL, Experience with TypeORM, Docker, Jest, Ability to write integration and E2E tests, Knowledge of coding best practices 📃 Skills: NestJS, Node.js, TypeScript, CI/CD, GitHub, PostgreSQL, TypeORM, Docker, Jest, RabbitMQ, Sentry, Zod, class-validator, Testcontainers, OpenAPI, Swagger 🏢 Description: Szukamy Backend Developera , który pomoże nam rozwijać i optymalizować kluczowy system wewnętrzny firmy. Jeśli masz silne doświadczenie w NestJS, Node.js i TypeScript , a do tego dobrze odnajdujesz się w środowisku CI/CD i automatyzacji wdrożeń, to jesteś osobą, której szukamy! ✅ Wymagania 🔹 Senior 7+ lat doświadczenia w komercyjnym tworzeniu aplikacji backendowych 🔹 Senior 5+ lat pracy z NestJS, TypeScript i Node.js 🔹 Doświadczenie w pełnym cyklu wytwarzania oprogramowania – od planowania po stabilizację po wdrożeniu 🔹 Doświadczenie w automatyzacji procesów wdrożeniowych (Github Actions, CI/CD) 🔹 Biegłość w pracy z bazami danych PostgreSQL 🔹 Znajomość TypeORM, Docker i Jest 🔹 Umiejętność pisania testów integracyjnych oraz testów E2E 🔹 Znajomość dobrych praktyk kodowania i umiejętność pracy zespołowej 🌟 Mile widziane 🔸 Doświadczenie z RabbitMQ lub innymi systemami kolejkowania wiadomości 🔸 Znajomość narzędzi monitoringu i error tracking (np. Sentry) 🔸 Doświadczenie z walidacją danych (Zod, class-validator) 🔸 Znajomość Testcontainers lub podobnych narzędzi do testów integracyjnych 🔸 Doświadczenie z OpenAPI/Swagger