Jobs Node.js

We invite a Senior Software Engineer with strong Node.js expertise and solid AWS knowledge to join our team. You'll work with a trusted leader in the Point-of-Sale industry with over 100,000 global installations. In this role, you’ll contribute to our client’s new initiative focused on creating data mapping between diverse menu order systems and integrating two distinct APIs to ensure seamless and accurate data transfer.

🟩 What's in it for you:

• Collaborate on a high-load, technically challenging backend project, expanding your expertise in API integration, data mapping, and data transformation
• Contribute to a global tech platform offering robust solutions for the restaurant and food service industry
• Influence technical best practices and mentor engineers, promoting a culture of quality and continuous improvement

✅ Is that you?

• 4+ years of commercial backend development experience with deep expertise in Node.js and TypeScript in production environments
• 2-3+ years of AWS experience (EC2, ECS, Lambda, SQS/SNS, CloudWatch, etc.)
• Solid experience with MongoDB
• Proven experience designing, building, and maintaining RESTful APIs
• Strong understanding of backend architecture and service design
• Experience writing unit and integration tests
• Experience with CI/CD pipelines and automated deployments
• Strong ownership mindset and ability to work independently, resolve complex issues, and deliver solutions
• Excellent communication and cross-functional collaboration skills
• Upper-Intermediate+ English level

Desirable:

• Experience mentoring or providing technical guidance to engineers
   

🧩Key responsibilities and your contribution

In this role, you’ll contribute to the design, development, and continuous improvement of high-loaded backend systems and services, ensuring technical quality and delivering bullet-proof solutions.

• Design, build, and maintain high-loaded backend systems and APIs using Node.js and AWS
• Develop new backend features and enhancements for production systems
• Support and troubleshoot production systems to ensure reliability and performance
• Identify and reduce technical debt and implement improvements to maintain code quality and reliability
• Write and maintain unit and integration tests to ensure code quality
• Collaborate with cross-functional teams to define requirements and deliver bullet-proof solutions
• Contribute to the continuous improvement of backend architecture and development practices
• Create and maintain clear, organized development documentation

We are seeking a Team Lead React/ Node.js to lead a small, high-impact engineering team

responsible for our customer-facing web platform and API, and an internal platform used for AI

model training. This role is both hands-on and leadership-oriented, with a strong focus on technical

ownership, system design, and product-team collaboration.

The ideal candidate combines deep technical expertise in modern TypeScript-based development

with experience guiding engineers, improving workflows, and shipping high-quality features in a

fast-paced startup environment.

Key ResponsibilitiesTeam Leadership

Lead a team of two full stack developers and one QA engineer.

Provide ongoing mentorship, code reviews, and technical direction.

Facilitate Scrum ceremonies and maintain smooth execution of sprints.

Ensure high engineering standards, testing quality, and delivery velocity.

Technical Ownership

Own the development and maintenance of our customer-facing web platform (React +Node.js), external APIs and Internal Platform.

Lead architecture, design, and implementation of backend services using AWS Lambda

(serverless) and containerized workloads on EC2.

Oversee performance, reliability, and scalability of the Postgres RDS database.

Drive improvements to CI/CD pipelines, build systems, testing strategy, and infrastructure

reliability.

Ecosystem & Tooling

Work within a monorepo environment.

Manage Infrastructure as Code using CloudFormation.

Maintain monitoring, logging, and alerting pipelines using Coralogix.

Ensure robust automated testing using Cypress and Vitest.

Maintain Docker-based development environments and EC2 deployments.Cross-Team Collaboration

Partner directly with Product Managers to translate requirements into technical plans.

Coordinate with other engineering teams under the CTO to align architecture, standards, and

shared components.

Key Projects They Will Own

Customer-facing web platform (React + Node.js + AWS) and API.

Internal platform for AI model training, including backend services and supporting tooling.

Ongoing modernization and scaling efforts across the stack.

Culture & Working Style

Scrum-based, iterative development

High autonomy—engineers are trusted to own problems end-to-end

Fast-paced startup with rapid decision-making and high impact

Qualifications

Strong experience with TypeScript across frontend and backend.

Hands-on experience with React, Node.js, AWS Lambda, EC2, Postgres RDS, and Docker.

Experience leading or mentoring engineers.

Solid understanding of CI/CD (GitHub Actions), automated testing, logging, and monitoring.

Ability to work directly with Product and translate requirements into architecture and tasks.

Nice to Have

Knowledge of serverless design patterns.

Experience in performance tuning for Postgres and Node.js.

Hiring Process

Technical screening

Culture and leadership interview with CEO

Playson 🤘 is a leading online gaming supplier founded in 2012 that has developed worldwide recognition in the industry.

Our promotional features team is seeking a Senior Backend Engineer with a strong background in Node.js. 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.

To succeed in the role, you will have:

• A degree in Computer Science or related field
• Strong development experience in Node.js/TypeScript 5+ years
• Strong understanding of Async approaches
• Experience with Messaging systems like Kafka, RabbitMQ
• Experience in distributed systems
• Experience with RDBMs (MySQL, PostgreSQL etc.), CDBMs (Redshift, ClickHouse etc.), NoSQL (DynamoDB, MongoDB, etc)
• Experience in writing e2e & unit tests
• Experience with development production-ready solutions
• Hands-on product experience with Kubernetes

Would be beneficial to know:

• 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 practices

What will you be doing?

• 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.

What you get in return:

• Competitive Salary: We offer a competitive salary in EUR, subject to annual performance reviews
• Quarterly Bonuses: Benefit from a transparent and systematic quarterly bonus system
• Flexible Schedule: We offer a flexible work schedule to accommodate your needs
• Remote Work Option: Choose to work remotely, providing greater flexibility and comfort
• Medical Insurance: Receive comprehensive medical insurance for both you and a significant other
• Financial Support for Life Events: We provide financial support during special life events
• Unlimited Paid Vacation: Enjoy unlimited paid vacation leave
• Unlimited Paid Sick Leave: Take unlimited paid sick leave whenever necessary
• Professional Development: Get reimbursement for professional development courses and training

Join us today!

About Company

AIstats is a fast-growing football tech ecosystem built on cutting-edge big data and computer vision. We are a fully remote global team of 30+ people, with a core hub in Warsaw.

Backed by Google executives and top mobile founders, we have quadrupled our valuation over the past year. Our mission is to elevate the global football experience: helping fans see the game with greater depth and providing professionals with powerful, next-generation tools to analyze every match.

Our Products

• AIstats Mobile App – a consumer product for fans and bettors, which has already reached 100K MAU since its launch in September.
• AIstats Business Solutions – analytics tools powered by ML models and computer vision technologies, helping clubs and scouts make more informed decisions.

Key Responsibilities

• Development of new HTTP and WebSocket endpoints with integration of third-party APIs (REST/gRPC/GraphQL - depending on tasks).
• Writing unit and integration tests to ensure correct operation of APIs, including boundary cases and work with external services.
• Performing load testing and code profiling to identify bottlenecks and improve performance.
• Working closely with frontend, analytics and product teams - from discussing specifications to implementing solutions in production.

Requirements

Must have:

• Strong knowledge of Node.js and TypeScript, experience in REST/WebSocket API development.
• Experience with microservice architecture and interaction between services via RabbitMQ, Redis, TCP connections.
• Knowledge of PostgreSQL (query writing, indexing, transactions, migrations).
• Experience with MongoDB and understanding when it is appropriate to use it.
• Experience with Docker, understanding of how docker-compose works.
• Understanding of the principles of Nginx as a proxy server (including in the context of WebSocket/HTTPS).
• Proficiency with Socket.io, understanding of its features (e.g., rooms, reconnect, persistence, etc.).
• Experience in configuring logging, debugging and profiling backend code.

Will be a plus:

• Understanding how Billing systems work
• Experience with Elasticsearch: setting up and using it for full-text search.
• Load testing skills and tools (e.g. k6, Artillery, autocannon).
• Understanding and implementation of HTTPS, certificates, working via secure WebSocket.
• Experience with CI/CD and build automation in a Docker environment.
• Team development experience: code review, git flow, Jira/YouTrack/Linear.

What we offer

• Fully remote work format and flexible working hours.
• Competitive salary pegged to USD.
• 24 days of paid vacation and 15 additional paid days off (including sick leave, personal days and corporate holidays)
• A friendly communication culture, rapid product cycles, and transparent processes.
• Dynamic work environment with a team passionate about sports and technology.
• Opportunities for professional development and career growth.
• No micromanagement — just trust, ownership, and freedom to experiment.
• Mentorship and high-quality engineering feedback.

Join our team and help drive innovation in the football industry!

We are looking for a Senior Full-Stack Engineer, who understands how systems are designed, scaled, and maintained in production environments, with a solid understanding of system design and architecture.

🌍 Who we are:

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

🧩About the Product:

You’ll work on a cloud-native AI governance platform designed to intercept, classify, and control high-velocity AI interactions in real time - without revealing the client’s identity.

The platform analyzes user prompts, AI responses, coding-agent activity, and enterprise search outputs flowing across HTTP streams, IDE extensions, LLM APIs, and internal microservices. 

You will be joining a core engineering team that is building a platform with real industry impact - one shaping how AI responsibly integrates into the modern enterprise.

🌟About the Role:

We are looking for a Senior Full-Stack Engineer (Backend-focused) to join a small, high-caliber team developing the core components of this real-time governance system.

Your primary focus will be backend engineering with Node.js/TypeScript - building high-performance services, scalable APIs, distributed processing flows, and policy-evaluation pipelines. When needed, you’ll contribute to the React-based frontend to deliver features end-to-end.

🔥 Why join this product:

✔ Mission-critical product defining how enterprises safely adopt AI.
✔ Deep engineering challenges — real-time pipelines, distributed flows, policy engines.
✔ Modern stack: Node.js, TypeScript, React, PostgreSQL, Docker, cloud-native tooling.

 ✔ Focus on architectural thinking: system structure, service-to-service communication, and production scalability.

💻 Required Competence and Skills:

• 10+ years of professional software development experience
• 5+ years of hands-on experience with Node.js and TypeScript. Solid React experience (job requires React as a must-have).
• Strong knowledge of backend architecture, distributed systems, and scalable service design
• Experience with a multi-service production system and service-to-service communication
• Proven experience working with SaaS-based systems
• Experience with relational databases (PostgreSQL or similar)
• Experience with containerized/cloud-native environments
• Practical React experience sufficient for full-stack delivery
• Deep understanding of JavaScript/TypeScript runtime patterns and performance considerations
• Strong communication skills and comfort working asynchronously in a distributed team
• Ability to thrive in a fast-paced, high-ownership environment
• Excellent English (written and spoken)

➕ Nice to Have:

• Experience with CI/CD pipelines (GitHub Actions or similar)
• Experience with Python and/or Go
• Production experience with large-scale TypeScript-based backend systems
• Exposure to LLM/AI products (LLM APIs, vector DBs, orchestration frameworks)
• Experience integrating ML/AI models into production systems
• Background in B2B or security-focused products
• BSc in Computer Science or related field

🚀 Why Us:

• We provide 20 days of vacation leave per calendar year (plus official national holidays of the country you are based in).
• We provide full accounting and legal support in all countries where we operate.
• We utilize a fully remote work model with a powerful workstation and co-working space in case you need it.
• We offer a highly competitive package with yearly performance and compensation reviews.

The role

As a Back-End Engineering Intern at HelloBiome, you will contribute to building and improving the infrastructure behind our AI-driven microbiome solutions. You’ll work closely with researchers and software engineers to help design, implement, and maintain components of scalable back-end systems that support experimentation with large language models (LLMs) and other AI tools.

This internship is a great opportunity for someone who is passionate about back-end development, curious about AI, and eager to learn in a fast-paced R&D environment. You will gain hands-on experience transforming prototypes into functional services, supporting data-intensive workflows, and contributing to technology that advances health innovation.

Requirements

1. Experience with JavaScript and an interest in back‑end development, with a primary focus on Node.js.
2. Active GitHub profile with examples of your work (bonus points for a complete project).
3. Basic understanding of APIs, server‑side application design, and microservice concepts.
4. Some experience with databases (SQL or NoSQL) through coursework or personal projects.
5. Understanding of testing principles and the role of automated tests in maintaining code quality.
6. Strong curiosity and motivation to learn new technologies and engineering practices.
7. Good problem‑solving skills and attention to detail.
8. Good communication skills and ability to work in a collaborative team environment.

Nice to Have

1. Familiarity with cloud platforms such as AWS, Azure, or Google Cloud.
2. Experience building small APIs or backend services.
3. Experience writing tests using tools such as Jest, Mocha, or similar frameworks.

Responsibilities

1. Help develop and maintain backend services used in HelloBiome products.
2. Work with researchers and engineers to turn research prototypes into reliable backend systems.
3. Contribute to the development of APIs, microservices, and data pipelines supporting LLM and AI workflows.
4. Write automated tests, increase code coverage, and improve the quality of the existing codebase.
5. Support the development of backend data processing services and pipelines.
6. Help ensure system security and compliance, especially for sensitive health data.
7. Participate in code reviews, technical discussions, and architecture exploration with guidance from senior engineers.
8. Contribute ideas and iterate on solutions to improve system reliability and engineering quality.

About HelloBiome

HelloBiome is an innovative B2B biotech startup at the forefront of AI-powered microbiome innovation. We are dedicated to revolutionizing consumer health by leveraging the microbiome. Through democratizing access to microbiome data, HelloBiome utilizes advanced AI technologies to develop targeted health solutions, transforming these insights into commercial applications for our business clients. Trusted by over 20 clients, including industry giants like Unilever, we are not just predicting the future of consumer health; we are actively shaping it. At HelloBiome, every step we take is towards a healthier future, optimizing well-being one microbiome at a time.
 

Our Culture

At HelloBiome, we thrive in a globally connected, remote work environment with team members distributed across Europe, the US, Canada, and Korea. Our headquarters are in San Francisco and Our dynamic and international team embodies a culture of kindness paired with a drive for innovation and excellence. We value proactive individuals who bring a self-starter mindset to their roles, always seeking new ways to advance our mission. Attention to detail is crucial in our work, as we are committed to delivering precise and impactful health solutions to our B2B clients.
 

This remote and flexible work structure not only fosters a diverse and inclusive atmosphere but also encourages a balance between personal growth and professional excellence. Join us and be part of a team that is shaping the future of consumer health through groundbreaking AI-powered microbiome innovation.

We're hiring an AI-First Developer who works primarily through AI coding assistants (Cursor, Claude Code, Windsurf) to deliver features and fixes at high velocity. You'll be orchestrating AI agents, reviewing their output, and steering implementations toward production quality. 

Responsibilities: 

• Implement features and resolve bugs using AI coding tools as your primary workflow 
• Navigate and understand existing codebases — architecture, file structure, dependencies 
• Follow TDD: write tests first, validate failure, implement, verify 
• Maintain per-feature documentation (MD files) 
• Ship fast, iterate, communicate blockers 

Requirements: 

• Hands-on experience with AI coding tools (Cursor, Claude Code, Copilot, or similar) 
• Ability to quickly understand unfamiliar codebases and spot issues 
• Strong debugging skills — catch and correct AI-generated mistakes 
• Comfortable with Node.js / TypeScript / Python stack 
• Self-driven, proactive, no hand-holding needed 
• English: working proficiency (async team communication) 

Nice to have: 

• Experience with TDD workflows 
• Familiarity with Proxmox, Hetzner, or similar infrastructure 
• Understanding of multi-agent AI systems 

We offer: 

• Fully remote – work from anywhere 
• AI-first engineering culture 
• Opportunity to work on cutting-edge AI orchestration products 
• Mentorship and growth within the team 
• Work on internal projects from day one 

Recruitment Process: 

1. Initial Screening (Application Form) 
2. HR and Final Interviews  
3. Job Offer 

If you have any questions or need clarifications, feel free to reach out to our Talent Hunter Team by email. 

Cowchain blockchain development company is actively looking for Backend Developer to join our development team.

About us:
Cowchain have successfully completed 150+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

We’ll match if you have

• Independent thinking and proactive position in development
• Strong problem-solving skills with a keen ability to think analytically and approach complex challenges
• Attention to detail
• Strong tech research skills
• Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
• Knows how to leverage AI tools to enhance coding efficiency and productivity

Required skills

• Experience in Backend development
• JIRA, git-flow

Will be a huge plus

• Web3 knowledge and user experience

What will you do

• New features development
• Bugfixes and support existing solutions
• Participate in project architecture discussions
• Build solutions from scratch as well as join ongoing development process
• Have fun

What we offer

• Flexible working schedule, remote work
• Competitive salary with bonuses for activities
• Ability to dive into fast-growing blockchain/crypto industry
• Work with modern tech stack (blockchain)
• Paid vacations, sick leaves
• 100% friendly/family team

Please note that the vacancy is only for candidates ready for offline format of work in Uzhhorod.

Build the most meaningful apps on the latest web technologies!

ABOUT ELEMENTICA

Welcome to Elementica! We are excited to see you on our profile. Elementica is a leading global software development company – expert in delivering web development, mobile application development and IT consulting services of any complexity to clients worldwide.

www.elementica.io

JOB POSITION

We are looking for a talented NodeJS Developer to join our Development Team. You will be at the core of our talented Web Apps teams and focus on building the most advanced and meaningful apps and workflows on the latest web technologies.

RESPONSIBILITIES AND DUTIES

As a NodeJS developer, you will work on our next generation applications, a large B2B AI-powered ecosystem critical to our customer’s needs. We need our engineers to be versatile, display leadership qualities and be enthusiastic to take on new challenges as we continue to push technology forward.

We are Product oriented developers with a growth mindset. We are curious problem solvers and we like to collaborate, communicate, share knowledge and technical ideas and grow together.

What you’ll do:

- Develop cloud based backend web applications

- Work in all phases of the software development life-cycle (planning, design, implementation, deployment, monitoring and support)

- Collaborate and grow in a dynamic environment while working in small, agile and cross functional teams

- Use the latest technologies to solve real problems for our customers

- Communicate and coordinate with our engineering team in Ukraine/Uzhhorod.

What we look for in you:

- Results-orientation, collaborative, pragmatic and agile mindset

- Strong knowledge in working with Javascript and Typescript

- Expertise with cloud service providers - Microsoft Azure and it's services for backend deployment

- Working proficiency in English (verbal & written)

- Continuous independent learning

We are looking for these skills/experience:

* Experience with 3rd party APIs integration / OpenAI, Facebook API, Google Sheets API

* Deep knowledge of NestJS

* Familiarity with ORM (Object Relational Mapper) libraries - TypeORM/Drizzle

* Strong knowledge of relational and non-relational databases (PostgreSQL/MongoDB)

* Experience working with Docker and Docker Compose

* Experience working with E2E and unit tests
* Familiarity in Bull.js, Redis is a strong plus

* Understanding of common development principles and best practices (SOLID, DRY, YAGNI) and design patterns

* Experience in CI/CD is a plus

* Experience in frontend development(React) is a plus

What we offer:

* The opportunity to drive the development of cutting-edge software products

* The chance to work on interesting technical challenges such as advanced algorithms, wide integrations or scalable content management

* A positive, highly skilled, young team with a focus on quality

* Hybrid working possibility / Flexible working hours

* Pick your own gear: Linux or IOS - whatever works best for you

* A lot of room for your own ideas. We always highly encourage you to work on them together with the team.

* Outstanding compensation based on experience and 20 days vacation

* Sponsored training opportunities with Udemy

Our job offer NodeJS Developer sounds interesting? Then we are looking forward to receiving your application!

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

About the Product:
Zenity is the first security governance platform built specifically for AI Copilots, Low-Code/No-Code applications, and business-led development. Enterprises today create thousands of automations, workflows, copilots, and integrations outside traditional R&D—introducing new, fast-moving security risks. Zenity provides organizations with:

• Real-time detection of misconfigurations, unsafe data flows, and policy violations
• Centralized visibility across hundreds of business-driven apps and automations
• Security guardrails for GenAI and LLM-powered tools
• Prioritized vulnerability reports and guided remediation

About the Role:
Zenity is hiring a Senior Backend Engineer to help drive the evolution of its security platform for AI and Low-Code ecosystems. The perfect candidate will be passionate about building large-scale, cloud-based solutions. You’ll be working in a dynamic, Agile setting, helping to drive the ongoing development and enhancement of the platform.

Key Responsibilities: 

• Design and build backend services powering security governance for GenAI, Copilots, and Low-Code platforms
• Deliver end-to-end product features used by enterprise customers at scale
• Develop detection logic, data flows, and validation layers for complex workflows and automations
• Work with distributed systems, microservices, and cloud-native components
• Build and optimize SQL schema, queries, data models, and near-real-time processing pipelines
• Participate in design reviews, collaborate closely with product and security teams, and contribute thoughtful technical decisions
• Implement security-focused backend solutions that help enterprises adopt AI responsibly
• Use AI-assisted development tools (Copilot, Cursor, Claude Code, etc.) as part of the day-to-day workflow

Required Competence and Skills:
 

• 7+ years of software engineering experience with proven delivery of production features
• Strong Node.js or Python experience, working on core product systems with real user impact
• Readiness to work with Python – as main language and also with Node.js and Golang – up to 20%
• Strong SQL fundamentals; hands-on experience with PostgreSQL/MySQL plus familiarity with MongoDB or DynamoDB
• Experience building distributed systems or microservices, including observability and CI/CD automation
• Solid cloud background (AWS preferred) and hands-on work with Docker and container-based deployments
• Practical use of AI-assisted development tools and understanding of context engineering / AI-first development principles
• Experience contributing to high-scale or customer-facing products
• Strong communication skills in English, plus experience collaborating with distributed teams
• Ownership mindset and the ability to take a feature from design to production

Nice to have:

• Background in data engineering, streaming, or maintaining near real-time data pipelines
• Experience designing ETL/ELT pipelines or large-scale data systems
• Hands-on with Kubernetes
• Experience with workflow orchestration (Temporal, Cadence, or similar)
• Ability to work across multiple languages (Python + Go or Node.js)

Why Us?

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

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

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

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

Our platform simplifies the entire journey—from selecting a product, to purchasing, connecting, and launching it. We aim to challenge outdated and complex processes such as DNS configuration, subscription management, switching between products or add-ons, and more. By leveraging modern technology, we remove complexity behind the scenes and provide customers with an intuitive, world-class experience.

This platform will unify how customers interact with digital products, making complex operations easy for anyone and redefining what “seamless” means in our industry and beyond.

Your expertise:

• Solid proficiency with JavaScript (ES6+)
• Basic to intermediate TypeScript knowledge and willingness to grow
• Experience with Node.js server-side development
• Knowledge and experience with Docker
• Practical experience working with SQL (queries, schemas, indexing basics)
• Experience with at least one major cloud provider (AWS / Azure / GCP)
• Understanding of asynchronous programming in Node.js
• Awareness of clean code principles and maintainable coding practices
• Understanding of Object-Oriented programming
• Basic understanding of SOLID principles
• Experience writing unit tests (integration tests is a bonus)
• Understanding of HTTP protocol
• Basic familiarity with common web security threats and mitigation
• Proficient understanding of Git
• Willingness to work across all stages of the application lifecycle: development, environments, deployments, maintenance
• Systematic approach to problem-solving

Will definitely be a plus: 

• Experience with another programming language besides JS / TS
• Basic understanding of client-side concepts:
  • event loop, micro/macro tasks
  • browser as a platform and devtools
• Experience with ReactJS and its ecosystem
• Competent English (reading, writing, speaking)
  
  You will be involved into:
• Participate in full-cycle development of backend features (and occasionally frontend)
• Support and maintain existing functionality
• Contribute engineering expertise to help deliver new product functionality
• Implement features according to product vision with proper test coverage
• Validate functional and non-functional requirements
• Collaborate with business stakeholders when needed to deliver high-quality functionality

Company is looking for a Senior Backend Engineer to help build the infrastructure that secures the world’s software supply chains. You’ll work closely with top-tier engineers to design and ship high-performance, secure systems at scale.

This role is a great fit for someone who thrives in fast-moving environments, enjoys solving deep technical challenges, and wants their work to have real impact.

    Responsibilities

• Design, build, and maintain scalable backend services and APIs
• Develop reliable, secure, and high-performance systems in a production environment
• Work with SQL and NoSQL databases to support application needs and performance goals
• Collaborate with engineers to design and improve microservices - based architecture
• Contribute to clean, maintainable codebases and strong engineering standards

• Troubleshoot and resolve complex issues across services and infrastructure

   

  Requirements

• Bachelor’s degree in Computer Science or a related field
• 5+ years of backend development experience building scalable applications
• Strong proficiency in Node.js
• Advanced knowledge of PostgreSQL, Redis, or MongoDB under high load
• Familiarity with cloud services and microservices architecture: must have experience breaking down monolithic applications into microservices.
• Excellent problem-solving skills and a commitment to clean, maintainable code
• Proven track record of solving performance bottlenecks in high-volume data systems.
• Experience with SAST, SCA, or relevant security tools.

Company is looking for a Senior Backend Engineer. As a Senior Software Engineer you will take a significant part in the development of company’s core payments platform. Company's payments platform provides secure and efficient payment processing by optimizing payment routing flows, ensuring transaction security, and managing refunds. You will work with diverse payment gateways to enable a wide range of alternative payment methods, build expertise with various digital wallets, credit options, and region-specific payment solutions, while also implementing fraud detection capabilities, manage the full lifecycle of chargebacks, and take part in building company's data lake for analytics and operations. If you are passionate about technology and software development, with end-to-end experience developing in a fast-growing startup environment, we want to meet you!

Responsibilities 
• Building our high scale cloud-based payments platform in Node.js • Have end to end ownership: Design, build, ship, measure and maintain low latency, high availability and high performance services. 
• Bring your unique experience - we are open to new ideas and expect you to bring our team and platform to a new level 
• Optimize resource usage (database, infrastructure, integrations) 
• Mentor and guide software engineers and help build a professional and effective team. 

Requirements: 
• At least 5 years of proven experience in developing end-to-end web applications (experience in Fintech companies - advantage) 

• Proficiency with cloud-based environments (AWS - preferred) 

• Proficiency with Node.js / Python / Java

• Experience with Docker 

• Experience with NoSQL solutions (MongoDB, Redis - advantage) 

• Experience with Microservices 

• Excellent problem-solving and troubleshooting skills 

• Knowledge of software development lifecycle 

• Strong communication and collaboration abilities 

• Self-motivated with a startup mindset and ability to work independently

Moon Active is one of the world's top mobile game companies, our teams leverage cutting-edge technologies to craft fun and interactive games enjoyed by millions worldwide. We produce exciting and engaging entertainment for players across the globe and pride ourselves on developing top-quality casual games that invite and allow players to connect with one another.

As a BackEnd Developer, you will be working in a scrum team implementing new features and improving existing code for our most popular game. We are looking for a Strong developer to join an engineering team that is responsible for building complex, high-scale, and real-time systems.

We work with Node.js/Redis/Neo4j/K8s/Microservices, 24/7 serving 100k req/sec, 200k+ req/sec at peaks, Redis used as the main storage, handling terabytes of data and 200M ops/min.
 

Responsibilities:

• Delivering new game features every few weeks;
• Building distributed systems and microservices;
• Mainly developing real-time mobile game server with Node.js and Redis;
• Working with the Kyiv-based cross-functional team that also includes Unity developers and QAs.

Requirements:

• Backend development experience (any OOP language, ex. Node.js, Java, C#, etc.);
• Familiarity with Node.js - must;
• Willingness to operate within an AI-first approach for development productivity and feature integration;
• Experience with distributed systems and microservices architecture;
• Experience with NoSQL databases (ex. Redis);
• Experience with Backend development of real-time web services;
• Experience in a high scale system will be a plus;
• Experience working with Scrum teams will be a plus;
• Good spoken and written English is a MUST.

Benefits:

Why join Moon Active? 

• Be part of a leading global mobile gaming company with a unique product enjoyed by millions;
• Thrive in an exceptional, innovative, and dynamic environment;
• Enjoy full transparency and open communication with talented colleagues across teams;
• Take advantage of tremendous opportunities for professional growth and career advancement within a rapidly expanding company;
• Influence and help build personalized product experiences that impact millions of users worldwide.

We offer:

• Generous compensation; paid vacation and sick leave;
• Extensive medical and life insurance coverage for you and your family;
• CrossFit & running classes at the office and MultiSport card;  
• Comfortable and modern office located on Królewska 16 street in Warsaw;
• Free daily breakfasts and lunches, and a fully stocked kitchen with snacks and fruits;
• Latest tech equipment, including macOS devices;
• Training & Development/Tuition reimbursement;
• Friend Referral Program with generous bonuses;
• Fun and collaborative workplace culture with regular Friday Happy Hours and team gatherings;
• Relocation bonus for candidates moving to Warsaw;
• Bicycle and Car parking.

We Play to Win! We Play it Smart! We Play as a Team!

We are committed to investing in our employees and fostering a workplace that champions innovation, creativity, and collaboration. At Moon Active, we empower our team members to unleash their potential and achieve remarkable results every day. We encourage bold decision-making and believe that every individual has a significant impact on our success. Join us and level up your career in a supportive and high-achieving environment!

Technologies

Core:

• Node.js (Express, MongoDB)
• Python (TensorFlow, OpenCV)
• Docker, Redis, FFmpeg
• AWS (Lambda, SQS, ECS)

Additional:

• React/Next.js, WebRTC
• Machine Learning
• REST API, microservices

Example Tasks

• Build a parser for kick.com streams
• Add a “team kill” highlight in CS2
• Implement player camera detection in live video streams

Requirements

Must-have:

• 2+ years of experience with Node.js or Python
• Knowledge of microservices, MongoDB, Redis
• Git, Docker, REST API

Preferred:

• Experience with FFmpeg
• Knowledge of AWS, ML
• Understanding of the esports industry

Format & Conditions

• Salary: $2000–3500, regular reviews
• Remote, flexible schedule
• Exciting projects involving video, AI, and system scaling
• Growth opportunities to Senior/Tech Lead