Jobs Node.js

SKELAR is a venture builder that builds international IT product companies according to the rules of the venture capital world. Together with our co-founders, we assemble strong teams to launch tech businesses and win in global markets.

We are currently looking for a Backend Engineer (MarTech).

We are Leaply, an ecosystem of digital and physical products designed to help people build healthy habits and improve their quality of life. We operate in global markets - the US, Tier 1, Europe, and beyond.

In June 2024, we launched an app focused on habit-building, using a subscription-based monetization model and a performance-first marketing approach (Meta, Google, TikTok). Within the first two months, we achieved positive unit economics and are now on track to grow 10x by the end of the year.

Our team is building its third business together, with successful exits behind us and a deep understanding of our niche and target audience. We move fast, communicate openly, and set ambitious goals.

What you’ll do:
— Build and evolve a unified marketing technology platform — not just a collection of tools, but a cohesive system that directly drives business performance;

— Take full ownership of 5+ existing services (Hokuto, UA automation, Creo Factory, Revealbot, Creo-translate): evaluate their current state, identify architectural bottlenecks, and systematically improve reliability, scalability, and maintainability;

— Develop and maintain production-grade integrations with Meta / TikTok / Google — ensuring robust error handling, rate limiting, retries, and clear monitoring so the system operates reliably without silent failures;

— Redesign the tracking architecture by shifting from client-side to server-side (CAPI pattern for Facebook and similar platforms), implement proper test coverage, and build tools that allow Growth Managers to independently configure tracking for their funnels;

— Eliminate manual operational workflows (e.g., in Airtable) and enable marketing teams (UA managers, designers, growth managers) to operate independently without engineering support for routine tasks;

— Proactively identify and implement new martech solutions before they become bottlenecks - shaping the long-term vision of the domain and driving technical and product priorities.

This role is for you if...

Must-have

— 3+ years of commercial backend development experience;

— Node.js / TypeScript as the main stack;

— Strong experience building reliable API integrations — including error handling, rate limiting, retries, and webhooks;

— GCP experience — Cloud Functions, Cloud Run, BigQuery, Firestore, or similar cloud environments;

— Systems thinking — able to see the system beyond individual tasks; independently designs architecture and defines development priorities;

— High level of autonomy — does not require a PM to define tasks; identifies problems and proposes solutions independently;

— Ability to collaborate with non-technical stakeholders — UA managers, designers, growth managers;

— Ownership mindset — proactively identifies risks, drives solutions, and thinks in terms of business impact;

— Uses AI as part of their workflow to move faster and think broader.

Nice-to-have

— Experience with Meta Business SDK / TikTok Marketing API / Google Ads API;

— Understanding of performance marketing — ROAS, CAPI, pixels, attribution;

— Experience building server-side tracking (e.g., Facebook CAPI or similar);

— Experience with marketing automation tools (Airtable automations, Make/Zapier, or custom solutions);

— Experience working on B2C subscription products with aggressive performance marketing.

SKELAR is an environment for self-realization of people who are able to create successful companies. We call such companies the next big everything. We believe in their power and scale.

To do this, we have created all the opportunities within our venture builder:

— 8 infrastructure teams that help businesses close any issues: from recruiting and communications to finance and legal issues;
— A community of founders who have already launched more than one business and can share practical experience;
— Internal clubs by professional areas: marketing, development, finance, recruiting, brand ambassadorship;
— Trainings, courses, attending conferences;
— Health insurance.

What You'll Own

• Architecture & technical direction of the entire serverless backend (Google Cloud Functions on Firebase / GCP).
• Code quality and standards — review PRs, define patterns, and guide the team on TypeScript best practices.
• System reliability — performance, observability, error handling, and deployment safety across dev / pre-prod / production environments.
• Integration strategy — design and maintain reliable two-way data flows with NetSuite, Business Central, HubSpot, Mailchimp, Constant Contact, Stripe, HERE API, Zapier, and Integration.app.
• Data architecture across Firestore (primary operational DB) and MongoDB (data warehouse).
• CI/CD pipelines in GitHub Actions, including selective function deployment.

• Mentorship — grow the engineering team and raise the bar on code review, testing, and documentation.
  
  What We're Looking For

  Must have:

• 8+ years of backend development with Node.js and TypeScript in production environments.
• Strong experience with serverless architectures — ideally Google Cloud Functions, AWS Lambda, or equivalent.
• Hands-on experience with NoSQL databases (Firestore, MongoDB, DynamoDB, or similar).
• Proven track record designing and maintaining third-party integrations (ERP, CRM, payment processors, webhooks).
• Solid understanding of event-driven architecture (Pub/Sub, queues, scheduled jobs, triggers).
• Experience designing REST APIs, request validation, authentication, and authorization patterns.
• Comfort owning CI/CD pipelines and managing multi-environment deployments.

• Ability to communicate clearly with non-technical stakeholders — including project managers, founders, and customers.

   

   

  Nice to have:

• Experience with Firebase ecosystem (Firestore, Cloud Functions, Auth, Storage).
• Background in CRM, ERP, or field operations domains.
• Familiarity with Stripe billing, subscription lifecycles, and in-app purchase reconciliation.
• Experience with geospatial features (route optimization, geofencing, HERE / Google Maps).

• Prior role as a tech lead or backend architect for an SMB / mid-market SaaS product.

   

  Why Join Us

• High ownership — you'll be the backend authority, not one of many.
• Real business impact — your work directly affects how field sales teams operate every day.
• Modern stack — TypeScript, serverless, cleanly structured codebase.
• Stable product with active enterprise customers and a clear product roadmap.
• Remote-first team and flexible schedule.

📍 Location: Remote

🗣 Language: English – B2

👥 Engagement: Contract / Fixed-rate contract

⏰ Start: ASAP

⏳ Estimated workload: ~31–40 hours for the entire contract

🏢 About the Project

We are looking for a Backend Developer for a short-term contract project in the mental health / wellness domain.

The project includes a backend API for a mental health mobile application. The backend is built with Express / TypeScript / Prisma and is already largely feature-complete. The system already includes:

• authentication and RBAC
• patient access controls
• journals and check-ins
• AI companion
• voice transcription
• prescriptions
• care plans
• wellness
• billing and other modules

The main focus of this role is completing worker services, improving the notification delivery system, and supporting integration of clinician workflows with real backend routes.

This is a well-structured contract project with a clearly defined scope, documentation, and expected outcomes for each task.

💼 Responsibilities

• Implement real push notification delivery in the SQS worker:
  • currently, the worker only logs notification events
  • integrate actual delivery via:
    • Expo Push
    • FCM
    • SES
    • SMS providers
• Complete the pre-session brief worker handler:
  • job scheduling is already in place
  • current handler only contains placeholder logging
  • implement actual brief generation and delivery logic
• Fix the USDA_API_KEY configuration:
  • wellness route currently falls back to DEMO_KEY
  • implement proper secrets / environment management
  • remove fallback behavior
• Collaborate with the frontend / clinician portal developer:
  • define and document backend endpoints for:
    • transcript workflows
    • SOAP note generation
    • ICD-10 coding
    • action items
    • pre-visit summary

🛠 Tech Stack

• Node.js
• TypeScript
• Express
• Prisma
• AWS SQS
• Expo Push
• AWS CDK

✅ Requirements

• 3+ years of commercial experience in Node.js backend development
• Strong proficiency in TypeScript
• Experience with message queue systems:
  • AWS SQS
  • BullMQ
  • or similar
• Hands-on experience integrating push notification providers:
  • Expo Push
  • FCM
  • APNs
  • or equivalent
• Strong understanding of:
  • REST API design
  • Express middleware
  • Prisma ORM
• Ability to quickly navigate and work within an existing codebase:
  • route handlers
  • service layers
  • worker job definitions
• Experience with secrets management and environment configuration in AWS environments

⭐️ Nice to Have

• Experience with AWS CDK
• Experience with Lambda / SQS infrastructure
• Knowledge of Expo push notification receipts and error handling
• Experience with HIPAA-adjacent or health-data products
• Experience with Deepgram or AWS Transcribe for voice processing

🎯 Ideal Candidate

We are looking for a self-driven backend engineer who is comfortable working in a short-term contract format, can quickly understand an existing backend architecture, and independently deliver integration and worker-related tasks in a production-ready state.

🧩 Hiring Process

Screening interview

Short technical interview

Offer 🚀

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

About the Role

Playson is a globally recognised iGaming supplier delivering a high-performance, microservices-based platform designed to process billions of financial transactions every day. Built across multiple regions, our infrastructure is focused on one clear ambition - driving latency as close to zero as possible.

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

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

If you’re product-driven, take ownership, and prefer a “build first, improve fast” approach while working on systems where every millisecond matters - this role will feel like home.

Key Responsibilities

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

Requirements

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

Nice to Have

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

What We Offer

• Competitive Salary: We offer a competitive salary, subject to annual performance reviews
• Quarterly Bonuses: Benefit from a transparent and systematic quarterly bonus system
• Unlimited Paid Vacation: Enjoy unlimited paid vacation leave, including Ukrainian bank holidays
• Unlimited Paid Sick Leave: Take unlimited paid sick leave whenever necessary
• Flexible Schedule: We offer a flexible work schedule to accommodate your needs
• Remote Work: 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
• Professional Development: Get reimbursement for professional development courses and training
• International exposure: Attend industry expos, team gatherings & global meet-ups
• B2B contracts

Recruitment process

1. HR interview (30-45mins)

2. Interview with a Product Owner (60mins)

3. Technical interview with live coding (90mins)

4. Final Interview with C-level (60 mins)

Insiders is a fast-growing IT company which employs about 200 people. Our company focused on providing innovative digital services and cutting-edge technologies to solve complex business challenges.

We are located in Lviv and currently work in an office format. For candidates from other cities, we offer relocation (an apartment located near the office, this option is free).

What we expect from the candidate:

• A solid understanding and practical application of HTML/CSS, JavaScript, TypeScript, and Node.js.
• A deep knowledge and understanding of networking, including REST API standards and HTTP/HTTPS methods.
• Experience working with GraphQL API.
• Proven experience in Node.js with Express.js and Nest.js.
• Databases skills — MongoDB, Redis, MySQL, PostgreSQL.
• Readiness to develop expertise in Object-Relational Mapping (Mongoose, Prisma.js, TypeORM, and Sequelize).
• Experience with Git and knowledge of how to effectively use GitHub during teamwork.

what we offer:

- free study in our Corporate English Academy

- growth and development opportunities for young developers even if you have no commercial experience

- regular salary review (after the completion of each contract)

- provision of Apple equipment

- comfortable office with all amenities not far from the center (uninterrupted internet, generator, tea and coffee, pastries).

- timely payment of salaries.

- corporate events, teambuildings, etc.

- working on projects side by side with Senior developers, which will give you the opportunity to learn and develop.
 

We're looking for a skilled Node.js developer who is eager to learn and grow with us. You'll be developing and maintaining high-quality applications using Node.js and related technologies. This is a fantastic opportunity to work on exciting projects, be part of a friendly team, and take your career to the next level. Come join us and let's build great things together!🧰 Requirements:

• At least 2 years of commercial experience as a Node.js engineer.
• Strong knowledge of JavaScript and TypeScript.
• Experience with Express.js.
• Experience with relational databases (PostgreSQL and/or MySQL).
• Familiarity with AWS services (ec2, s3, lambda).
• Good understanding of RESTful API design principles.
• Unit testing (mocha/jest).
• Excellent problem-solving and debugging skills.
• Strong communication and collaboration abilities.
• Pre Intermediate English (or higher).

🧰 As a plus:

• Experience with Nest.js
• Experience with Docker
• Non-relational databases (mongoDB, redis, elasticsearch)

💻 Responsibilities:

• Developing and maintaining high-quality applications using Node.js and related stack.
• Following high-end coding standards.
• Troubleshooting and debugging applications to ensure optimal performance.
• Implementing and maintaining database systems.
• Designing and implementing RESTful APIs.
• Participating in code reviews to ensure code quality.
• Keeping up-to-date with industry trends and best practices in Node.js development.
• Collaborating with cross-functional teams to deliver tasks on time.

🎁 We offer:

• Competitive salary
• Flexible working hours
• Paid time off and holidays
• Professional development opportunities
• Collaborative and inclusive work environment
• Opportunity to work on challenging and innovative projects
• Growth opportunities within the company

About the Role
Client is developing InfraCloud3D, a SaaS platform for the inspection and analysis of engineering structures based on large-scale 3D data.
We are looking for a Senior 3D Web Engineer to strengthen our team and take ownership of advanced 3D visualization challenges, including the integration of next-generation rendering technologies such as WebGPU.
You will work on a production system built on LuciadRIA, handling complex datasets with high demands on performance, scalability, and precision.

Your Responsibilities

• Develop and optimize web-based 3D visualization features within our platform
• Work with and extend our LuciadRIA-based 3D engine
• Design and implement high-performance rendering pipelines using WebGPU
• Handle large-scale datasets (e.g. photogrammetry, point clouds, meshes)
• Improve rendering performance, memory usage, and responsiveness
• Collaborate with frontend and backend developers (Angular, Node.js, TypeScript)
• Contribute to architectural decisions and guide less experienced developers

Tech Stack

• 3D Engine: LuciadRIA
• Frontend: TypeScript, Angular
• Backend: Node.js
• Infrastructure: GitLab, PostgreSQL, S3-compatible storage

Required Skills

• Strong JavaScript skills
• Solid understanding of 3D fundamentals
• Experience with at least one 3D framework (LuciadRIA preferred)
• Strong experience in web-based 3D visualization using WebGPU
• Proven experience with real-time 3D rendering in the browser
• Experience optimizing performance in large or complex 3D scenes

Preferred Skills

• Backend experience (Node.js) and data integration
• Experience with geospatial 3D systems or large coordinate spaces
• Experience with photogrammetry, point clouds, or mesh processing pipelines
• Experience with Gaussian Splatting or similar rendering techniques

About the Role

We are looking for a Full Stack Developer to support the continued development of InfraCloud, a SaaS platform for inspection and analysis of engineering structures. The platform processes and visualizes large-scale geospatial and inspection datasets.

You will work across the full application stackfrom frontend UI components to backend services and data persistencewithin a modern JavaScript based architecture.

A central focus of this role is the design and development of a Progressive Web App (PWA) to enable cross-platform usage on iOS, Android, and Windows tablets, particularly for field operations with challenging connectivity conditions.

Responsibilities

• Design, implement, and maintain scalable full stack features using:
  • Frontend: Angular
  • Backend: Node.js (TypeScript, RESTful APIs / microservices)
• Lead the development of a Progressive Web App (PWA) for cross-platform mobile and tablet environments (iOS, Android, Windows)
• Implement offline-first architecture patterns, including:
  • Service Workers (background sync, caching strategies)
  • Local data persistence (e.g., IndexedDB)
  • Resilient synchronization mechanisms for intermittent connectivity
  • Develop responsive, mobile-optimized UI/UX for field usage scenarios
• Develop and optimize APIs for handling large geospatial and inspection datasets
• Work with PostgreSQL (schema design, query optimization, indexing strategies)
• Integrate and manage object storage solutions (S3-compatible storage)
• Collaborate on system architecture decisions (modularity, scalability, performance)
• Ensure code quality through testing, code reviews, and static analysis
• Contribute to performance optimization (frontend rendering, backend throughput, data pipelines)
• Work closely with domain experts (e.g., geodesists, engineers) to translate requirements into technical solutions

Required Qualifications

• Strong experience with JavaScript and TypeScript across frontend and backend
  • Solid experience with Node.js and Angular
• Proven experience building Progressive Web Apps (PWA), including:
  • Service Worker lifecycle and caching strategies
  • Offline-first application design
  • Cross-platform mobile optimization (iOS/Android/browser constraints)
• Experience designing and consuming RESTful APIs
• Proficiency with PostgreSQL (complex queries, schema design, performance tuning)
• Experience with Git-based workflows (preferably GitLab)
• Familiarity with cloud storage systems (AWS S3 or compatible)
• Understanding of software architecture principles (security, separation of concerns, modularization, API design)

Nice to Have

• Experience with geospatial data, 3D data, or point cloud processing
• Knowledge of WebGL, 3D visualization frameworks, or mapping libraries
• Experience with microservices architecture or distributed systems
• Familiarity with Docker / containerization
• Exposure to CI/CD pipelines and DevOps practices
• Background in engineering, surveying, or environmental data systems

We are hiring a Senior Full Stack Engineer for an Israeli deep tech company building a large-scale real-time infrastructure monitoring platform.

The company develops advanced technology that transforms existing fiber optic networks into real-time sensor systems capable of monitoring critical infrastructure such as power grids, pipelines, railways, secured facilities, and perimeter assets across thousands of kilometers.

The platform combines distributed sensing technology, machine learning, and cloud-native infrastructure to detect anomalies, threats, and operational events in real time.

This is not a typical CRUD SaaS product.

The system processes continuous streams of sensor and telemetry data and delivers operational intelligence through complex dashboards, live alerts, monitoring workflows, and map-based interfaces used daily by enterprise customers and field operators.

The stack includes:

* Next.js

* NestJS

* TypeScript

* AWS

* Kubernetes

* Docker

The frontend is a critical part of the platform and includes:

* real-time operational dashboards

* map-based monitoring interfaces

* alerting systems

* large-scale data visualization

* complex state-heavy workflows

We are looking for a strong engineer who can independently own complex features end-to-end, from architecture and backend implementation to frontend delivery and production deployment.

Responsibilities

* Design and build complex full stack features end-to-end

* Develop scalable frontend applications using Next.js and React

* Build backend services and APIs using Node.js, TypeScript, and NestJS

* Work on real-time dashboards, operational workflows, and map-based interfaces

* Participate in architecture and technical decision-making

* Collaborate closely with product and engineering teams

* Optimize application performance, scalability, and reliability

* Take ownership of features from concept to production

* Use AI-powered engineering tools to accelerate development and improve code quality

Requirements

* 7+ years of experience as a Full Stack Engineer

* Strong hands-on experience with TypeScript across frontend and backend

* Strong experience with Next.js and modern React ecosystem

* Solid backend development experience with Node.js and NestJS

* Experience building complex production systems, not only simple CRUD applications

* Experience working with map-based interfaces or geospatial visualization

* Experience with AWS production environments

* Experience with Docker and cloud-native infrastructure

* Experience with Cypress or similar testing frameworks

* Strong understanding of architecture, scalability, and system design

* Strong ownership mindset and ability to independently drive features

* English level B2 or higher

Nice to Have

* Experience with Kubernetes

* Experience with real-time systems or event-driven architectures

* Experience with operational dashboards or monitoring systems

* Experience with data-heavy enterprise products

* Experience with microservices

* Experience with Python or Dash

Engineering Culture

The engineering team actively uses AI-powered development workflows as part of daily development. Engineers work with modern AI coding tools including Claude Code to accelerate implementation, improve code quality, and increase development velocity. The company provides engineers with access to AI development tooling as part of the standard engineering workflow.

This is a fully remote long-term opportunity to work on a technically advanced deep tech product solving real-world infrastructure and security challenges at global scale.

N-iX is looking for a Senior/Lead Node.js Engineer to join the team.

Our client is a leading global provider of 3D models designed for films, games, commercials, architecture, and more. You will be working on exciting and complex problems for the industry-leading 3D content website with millions of customers. Your work will be immediately impactful to our large professional and enterprise customer base. The team’s approach is to provide mentorship and peer reviews while bringing you up to speed on our codebase and business.

Responsibilities:

• Incrementally improve the product experience using a data-driven approach
• Provide direct input to drive the architectural and product direction of 3D projects

Requirements:

• 5+ years of strong full-stack development experience with advanced proficiency in Node.js, capable of learning adjacent technologies quickly.
• Experience designing and implementing robust APIs (REST/JSON: API), integrating services, managing background jobs, and defining distributed-system boundaries.
• Solid foundation in testing best practices, source control (Git/GitHub), and working with relational databases (PostgreSQL/MySQL).
• Demonstrated ability to drive technical solutions and mentor junior team members.
• Upper-intermediate+ English level

Would be a plus:

• Stimulus and Turbo
• Typescript
• JSON:API and GraphQL
• Tailwind
• Experience with AWS
• Previous exposure to Docker, Kubernetes
• Experience building event-driven or message-driven architecture using tools like RabbitMQ and Kafka

We offer*:

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

*not applicable for freelancers

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 - advantage;
• 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!

We are looking for a skilled Backend Developer (Node.js/NestJS) to join our high-performance engineering team.
In this role, you will build scalable microservices, work with modern event-driven architecture, and contribute to the development of large, high-load systems used by thousands of users daily.

Responsibilities

• Design, develop, and maintain high-load backend services using Node.js (NestJS).
• Build and optimize microservices architecture for scalability and resilience.
• Work with PostgreSQL (TypeORM), MongoDB (Mongoose), ClickHouse, and Redis.
• Implement efficient communication between services using gRPC.
• Integrate and work with Kafka and other message-driven components.
• Ensure proper implementation of caching, queues, and distributed operations.
• Apply secure coding principles and follow best practices.
• Analyze business requirements, identify issues, and provide timely fixes and improvements.
• Collaborate closely with cross-functional teams during planning and development.
   

Required Skills

• 3-4+ years of experience with Node.js, strong expertise in NestJS.
• Solid experience with:
  • PostgreSQL + TypeORM
  • MongoDB + Mongoose
  • Redis
  • ClickHouse (queries, schema design, optimization)
• Hands-on experience with Kafka and event-driven architecture.
• Experience with gRPC.
• Understanding of microservices and distributed system design.
• Experience with API services, WebSockets, and async communication patterns.
• Strong knowledge of JavaScript/TypeScript (ES6+).
• Understanding of HTTP/HTTPS, web protocols, and backend performance principles.
• Strong analytical and debugging skills — ability to identify defects and deliver hotfixes quickly.
   

Nice to have

• Hands-on knowledge of any other OOP language (preferably Java).
• Architecture patterns knowledge and usage.
• Experience with CI/CD pipelines and DevOps practices.
• Knowledge of security standards and best practices for backend systems.
• Experience in iGaming, fintech, or other high-load domains.

What We Offer: 

•  Competitive salary. 
• Fully remote work with flexible schedule. 
• Career growth in an international iGaming company. 

• Paid vacation and sick leave.
   

  If you are passionate about clean architecture, enjoy solving complex technical challenges, and want to grow in a product-driven environment — this role is for you.

🌎Akvelon is an American company with offices in Seattle, Mexico, Ukraine, Poland, and Serbia. Our company is an official vendor of Microsoft and Google. Our clients also include Amazon, Evernote, Intel, HP, Reddit, Pinterest, AT&T, T-Mobile, Starbucks, and LinkedIn. To work with Akvelon means to be connected with the best and brightest engineering teams from around the globe and working with an actual technology stack building Enterprise, CRM, LOB, Cloud, AI and Machine Learning, Cross-Platform, Mobile, and other types of applications customized to client’s needs and processes.

About the project:

The project is a data-driven platform for a well-established international client in the financial services domain. The platform helps internal teams work with large volumes of structured and unstructured data, supporting analytics, data processing, and business decision-making.

The product is a data system that includes dynamic user-facing functionality, APIs, cloud services, and features that help users interact with complex financial and analytical data in a more efficient way.

About the role:

We are looking for a Full-stack Node.js Engineer with a strong backend focus to help build scalable, API-driven services and product features.

The role is mainly focused on Node.js backend development, AWS-based services, PostgreSQL database work, and end-to-end feature ownership. Frontend experience is also important, as the engineer should be comfortable working with modern frontend frameworks and understanding how backend decisions affect the user experience.

Requirements:
Must have:

• 5+ years of professional software engineering experience
• Strong hands-on experience with Node.js backend development
• Experience building REST APIs, services, or microservices
• Strong SQL knowledge and hands-on experience with PostgreSQL
• Practical experience with AWS services such as Lambda, EC2, RDS, S3, and API Gateway
• Experience with at least one modern frontend framework: React, Vue, or Angular
• Experience owning features end-to-end, from requirements and implementation to release
• Good understanding of scalable, maintainable, cloud-native application architecture
• Ability to work in an international team and communicate clearly in English

Nice to have:

• Exposure to AI/ML-related product features or data-driven functionality
• Experience working with data extraction, data processing, or analytics-related products
• Experience in financial services, consulting, investment, or enterprise technology projects
• Ability to understand business requirements and translate them into technical solutions
• Experience with performance optimization and database query tuning
• Previous experience building internal platforms, dashboards, workflow tools, or user-facing business applications

Overlap: stay available until 8-9 PM CET

This position is open only to candidates based in Europe / Latam and is not open to U.S.-based applicants.

Working conditions and benefits:

• Flexible working schedule: 8 hours per day, 40 hours per week
• Paid vacation, sick leave (without a sickness list)
• Official state holidays – 11 days considered public holidays
• Professional growth while attending challenging projects and the possibility to switch your role, master new technologies and skills with company support
• Personal Career Development Plan (CDP)
• Employee support program (Discount, Care, Health, Legal compensation)
• Paid external training, conferences, and professional certification that meet the company’s business goals
• Internal workshops & seminars
• Corporate library (Paper/E-books) and internal English classes.

Our client is a fintech and cryptocurrency company building a full banking and payment processing platform, along with a crypto payment suite. You’ll join an established team working on backend development and banking integrations.

Responsibilities

• Backend development using Node.js
• Integration with external banking and financial APIs
• Development and maintenance of platform modules
• Working with SQL and NoSQL databases
• Collaboration with the client’s engineering team

Requirements

• 4+ years of hands-on backend development experience with Node.js
• Experience integrating external APIs (payment integrations are a strong plus)
• Solid experience with both SQL and NoSQL databases

Nice to have

• Experience in fintech, crypto, or banking domains
• Experience with payment integrations (e.g., Stripe)
• Knowledge of NestJS

Benefits

• Fully remote collaboration with a flexible working environment
• 14 business days of paid annual vacation, 5 paid sick days, and four additional paid holidays
• Opportunity to work on cutting-edge fintech and crypto products, shaping modern payment and banking solutions
• Collaborative and supportive team, where initiative is always valued

Our hiring process

1. Screening interview with a recruiter (30 minutes)
2. Technical interview with Team Lead and CTO (1 hour)