Jobs Node.js

• Project Description:

  As a Backend Developer for this project, you will have the opportunity to contribute to industry leading software for our global clients. You will work closely with cross-functional teams and regional experts to design, implement, and support solutions. This is your chance to work on a stable, long-term project with a global client, focusing on digital transformation and change management.
  
  We are looking for a Mid-Level Backend Developer with solid expertise in Node.js, RESTful API design, and cloud-native development. The ideal candidate will have hands-on experience building scalable, secure, and high-performance backend services deployed on AWS and Azure using Kubernetes. You will work closely with cross-functional teams to design, build, and maintain backend systems that power our applications.
  
  Why Join Us?
  - Exciting Opportunities: Work in squads under our customer's direction, utilizing Agile methodologies and Scrum.
  - Innovative Application: Contribute to an application that guides and documents the sales order process, aids in market analysis, and ensures competitive pricing.
  - Workflow Governance: Be part of a team that integrates digital and human approvals, ensuring seamless integration with a broader ecosystem of applications.
  - Global Exposure: Collaborate with reputed global clients, delivering top-notch solutions.
  - Career Growth: Join high-caliber project teams with front-end, back-end, and database developers, offering ample opportunities to learn, grow, and advance your career.
  
  If you have strong technical skills, effective communication abilities, and a commitment to quality, we want you on our team!
  
  Ready to make an impact? Apply now and be part of our journey to success!

• Responsibilities:

  • Design, develop, and maintain backend services and RESTful APIs using Node.js
  • Build and deploy containerized applications on Kubernetes across AWS and Azure environments
  • Collaborate with frontend, DevOps, and platform teams to define and deliver features
  • Implement and maintain CI/CD pipelines for automated build, test, and deployment
  • Ensure API performance, reliability, and security through proper design and monitoring
  • Manage and optimize cloud resources across AWS and Azure
  • Write and maintain unit, integration, and API tests to ensure code quality
  • Participate in code reviews, technical discussions, and architecture decisions
  • Troubleshoot production issues and contribute to incident resolution
  • Stay current with emerging technologies in backend development, cloud services, and container orchestration

• Mandatory Skills Description:

  Years of Experience:
  • 4-6 years in backend application development, with at least 1-2 years working with cloud services and container orchestration.
  
  Backend Development
  • Strong proficiency in Node.js (Express, Fastify, or NestJS)
  • Deep understanding of RESTful API design, versioning, and best practices
  • Experience with API authentication and authorization (OAuth2, JWT, API keys)
  • Proficiency in JavaScript and TypeScript
  • Understanding of event-driven architecture and message queues (e.g., RabbitMQ, Kafka, SQS)
  
  Cloud Services
  • Hands-on experience with AWS (EC2, S3, Lambda, SQS, SNS, IAM, CloudWatch)
  • Working knowledge of Azure (App Service, Azure Functions, Azure DevOps, AKS)
  • Understanding of cloud networking, security groups, IAM policies, and secret management
  
  Container Orchestration
  • Proficiency in Docker — building, optimizing, and managing container images
  • Hands-on experience with Kubernetes (K8s) — deployments, services, config maps, secrets, ingress, helm charts
  • Experience with managed Kubernetes services (EKS, AKS)
  
  DevOps
  • Experience with CI/CD pipelines using GitLab CI, GitHub Actions, Jenkins, or Azure DevOps
  • Familiarity with Infrastructure as Code (IaC) tools such as Terraform or Helm

• Nice-to-Have Skills Description:

  Database Management
  • Experience with SQL databases (PostgreSQL, MySQL) and NoSQL databases (MongoDB, DynamoDB, Redis)
  • Understanding of database optimization, indexing, and query performance tuning
  
  Observability and Monitoring
  • Familiarity with logging and monitoring tools (CloudWatch, Prometheus, Grafana, ELK stack)
  • Experience with distributed tracing (Jaeger, OpenTelemetry)
  
  Security
  • Understanding of API security best practices (rate limiting, input validation, CORS, HTTPS enforcement)
  • Familiarity with container security scanning and vulnerability management
  
  Testing
  • Experience with automated testing frameworks (Jest, Mocha, Supertest)
  • Understanding of integration and contract testing for APIs
  
  Soft Skills
  • Strong problem-solving abilities and attention to detail
  • Good communication and collaboration skills
  • Comfortable working in an agile development environment

• Languages:
  • English: C2 Proficient

Ready to shape the future of logistics technology? We are looking for a Middle/Senior Full Stack Developer to join our distributed team and help build a next-generation e-commerce fulfillment platform. This role offers remote flexibility with the option to work from Kraków, Poland. 

At Sigma Software, we partner with some of Europe’s most innovative companies, delivering solutions that combine cutting-edge technology with business impact. You will work in a collaborative Agile environment, leveraging modern frameworks and AI-assisted tools to create high-performance solutions. 

Why join us? You’ll be part of a long-term partnership, working on high-impact projects with access to advanced AI tools, cloud technologies, and a supportive team culture. 

CUSTOMER 

Our customer is one of Europe’s leading logistics providers, headquartered in Germany. Specializing in integrated supply chain systems and data-driven logistics optimization, they operate across multiple European markets, offering advanced warehousing, transportation, and fulfillment services. Sigma Software has been collaborating with them since 2017, delivering over 10 active projects that drive innovation and efficiency. 

PROJECT

You will contribute to the development of a next-generation e-commerce fulfillment platform designed to automate and optimize order processing, inventory management, and delivery tracking. The solution leverages modern web technologies and AI-assisted development tools to ensure scalability and efficiency. This is a chance to work on a high-impact product in a collaborative, Agile environment. 

Job Description

• Design, develop, and maintain robust software applications using TypeScript/JavaScript, Node.js, NestJS, and React.js 
• Implement new functionality from scratch, including role-based access control services, API integration services, and custom endpoints 
• Work in an AI-augmented development environment, leveraging tools like Claude Code, Cursor, and Microsoft Copilot 
• Collaborate closely with stakeholders to define, design, and deliver new features 
• Ensure code quality, security, and performance through critical evaluation of AI-generated outputs 
• Participate in SCRUM ceremonies and contribute to team planning, estimation, and retrospectives 

Qualifications

• 3+ years of commercial development experience with a focus on TypeScript/JavaScript 
• Proven expertise in Node.js, NestJS, React.js, Next.js, and REST API development 
• Experience with AI-assisted coding tools (Claude Code, Cursor, Microsoft Copilot, or similar) 
• Ability to write clear prompts for code generation and refactoring 
• Skills in evaluating AI-generated code for security and performance implications 
• Experience translating AI-generated specifications into implementation tasks 
• Proficiency in debugging and validating AI-generated code 
• Familiarity with AI-driven development frameworks (BMAD, Superpowers, GSD, spec-kit, or equivalent) 
• Experience with any cloud provider (preferably Azure) 
• Experience working in SCRUM teams 
• Fluent English 

WILL BE A PLUS

• Experience integrating and working with design systems (Tailwind, Storybook) 
• Proven experience with AI-augmented development (pet projects, certifications) 
• Participation in AI-assisted requirements breakdown and task decomposition using frameworks like spec-kit or BMAD 

PERSONAL PROFILE

• Strong communication, multitasking, and problem-solving skills 
• Analytical thinking and sound technical judgment 
• Quick grasp of existing digital products and architectures 

Location: Remote
Workload: Full-time
Project: long-term

About the role

We’re looking for a Backend Developer with strong Node.js/NestJS expertise to build and scale microservices-based systems. The role involves designing high-load services, working with distributed systems, and integrating modern backend patterns including async processing and real-time communication.

Requirements

• 3+ years of experience with Node.js and NestJS
• Strong experience with PostgreSQL, MongoDB, Redis
• Solid understanding of microservices architecture
• Experience with asynchronous processing (queues, event-driven systems)
• Ability to write scalable, maintainable, and reliable code
• Experience building REST APIs, WebSockets (WS/WSS), RPC services
• Ability to read and work with existing codebases
• High attention to detail

Nice to have

• Experience with Go / Golang
• Deep knowledge of NestJS (lifecycle, DI, custom providers, dynamic modules, scopes, Async Local Storage, reflector)
• Deep knowledge of Redis (MULTI/EXEC, data structures, Lua scripts, Pub/Sub)
• Basic understanding of prompt engineering, AI agents, skills

Responsibilities

• Develop and maintain microservices
• Design and implement high-load backend systems
• Work with event-driven and async architectures
• Optimize performance and scalability
• Collaborate with cross-functional teams

Are you ready to kick-start your career in a project that blends cutting-edge technology with real-world impact? We are looking for a Junior Full Stack Developer to join our remote team and help build a next-generation e-commerce fulfillment platform for one of Europe’s largest logistics companies.

At Sigma Software, we value curiosity, collaboration, and continuous learning. You’ll work in a supportive environment where innovation is encouraged, and your ideas matter. This is a great opportunity to grow your skills in both back-end and front-end development while exploring AI-assisted coding tools in a production setting.

Why join us? You’ll be part of a global team delivering impactful solutions, using modern technologies, and shaping the future of logistics.

Customer

Our client is one of Europe’s leading logistics providers, headquartered in Germany, specializing in integrated supply chain systems and data-driven logistics optimization. Operating across multiple European markets, they offer advanced warehousing, transportation, and fulfillment services. Sigma Software has been collaborating with them since 2017, delivering over 10 active projects that drive innovation and efficiency.

Project

You will contribute to the development of a next-generation e-commerce fulfillment platform designed to automate and optimize order processing, inventory management, and delivery tracking. The solution leverages modern web technologies and AI-assisted development tools to ensure scalability and efficiency. This is a chance to work on a high-impact product in a collaborative, Agile environment.

Requirements

• At least 1.5 years of commercial experience in software development with a focus on the TypeScript/JavaScript stack
• Proven experience with Node.js, React.js, and REST API development
• Familiarity with AI-assisted coding tools (Claude Code, Cursor, Microsoft Copilot, or similar)
• Ability to write effective prompts for AI-generated code and refactoring
• Experience preparing code for AI-assisted review and translating AI-generated specifications into implementation tasks
• Strong debugging and validation skills for AI-generated code
• Excellent communication and multitasking abilities
• Strong problem-solving and decision-making skills with a results-oriented mindset
• Analytical thinking and solid technical judgment
• Ability to quickly understand existing digital products and architectures
• Experience working in SCRUM teams
• Fluent English

WILL BE A PLUS

• Experience integrating and working with design systems (Tailwind, Storybook)
• Proven experience with AI-augmented development (pet projects, certifications)
• Experience in AI-assisted requirements breakdown and task decomposition (e.g., spec-kit, BMAD)

Personal Profile

• Collaborative mindset and willingness to learn
• Interest in backend development with readiness to work across the full stack
• Passion for quality, clean code, and continuous improvement

• Adaptability to work in a dynamic, AI-driven development environment

   

  Responsibilities

• Develop and maintain robust software applications using TypeScript/JavaScript, Node.js, Nest.js, and React
• Implement new functionality from scratch, such as role-based access control services, API integrations, and endpoint development, under the guidance of Senior Developers
• Collaborate closely with stakeholders to define, design, and deliver new features
• Work in an AI-augmented development environment, leveraging tools like Claude Code, Cursor, and Microsoft Copilot
• Participate in code reviews, ensuring code quality and maintainability
• Contribute to the continuous improvement of development processes and team collaboration practices
• Follow Agile/SCRUM methodologies and actively participate in ceremonies

About us

We build AI-powered solutions that solve real business problems. You’ll work with the latest technologies and implement production-grade AI features, including RAG pipelines, agentic and multi-agent workflows.

Responsibilities

• Solve engineering problems related to process automation, knowledge systems, and agentic / multi-agent architectures.
• Design, build, and maintain AI-powered features that go beyond basic LLM API calls.
• Develop backend services using Node.js (Express, Fastify, or NestJS).
• Implement and iterate on RAG pipelines (retrieval strategies, chunking, evaluation, quality improvements).
• Integrate external APIs, payment systems, and authentication flows.
• Design clean REST APIs and ensure reliable client–server communication.
• Work with PostgreSQL.

Requirements

• Strong problem-solving mindset, creativity, and ability to learn quickly.
• Solid Node.js experience in production (2+ years).
• Practical experience and strong interest in LLM-based systems, not just simple ChatGPT-style wrappers, including:
  • RAG
  • LangChain (bonus: LangGraph, LangSmith)
  • Prompt engineering
• Understanding of backend fundamentals: APIs, databases, performance, and debugging.

Nice to have

• Experience with Python and FastAPI.
• Redis, queues, caching.
• AWS or GCP familiarity.
• CI with GitHub Actions.
• Monitoring and tracing tools (Prometheus, Grafana, OpenTelemetry).

What we offer

• Competitive salary and bonuses
• Remote-first culture
• Flexible schedule
• Open-minded, results-driven environment
• Product ownership and impact

About Us
We are a fast-growing and leading company in the AI Voice space for the iGaming industry. We replace inefficient manual processes with scalable, reliable, and high-performance AI technology. Our solutions are already used by 20+ brands across 8+ geographies. We are well-funded, ambitious, and building a team of top professionals.

We’re looking for a Backend Developer to build and maintain reliable backend services and integrations. You’ll work with TypeScript services, REST APIs, and cloud infrastructure, and help us deliver features through clean architecture, automated tests, and robust CI/CD pipelines.

Responsibilities

• Design, build, and maintain backend services using TypeScript
• Develop and document REST APIs and handle API integrations with external systems
• Work with MongoDB: data modeling, performance optimization, and query tuning
• Containerize and run services using Docker
• Improve reliability and delivery speed via CI/CD, version control best practices, and code reviews
• Apply OOP principles and maintain clean, scalable architecture
• Write and maintain automated tests (unit/integration) and ensure quality gates
• Deploy and operate services on AWS (e.g., EC2, S3, Lambda) and monitor production stability
• Implement and support workflow orchestration using Temporal or a similar workflow engine

Requirements (Must-have) 

• Strong experience with TypeScript
• Experience with Node.js
• Hands-on experience with MongoDB
• Confident with Docker
• Good knowledge of Git/GitHub and modern development workflows
• Experience with CI/CD pipelines
• Solid understanding of OOP and clean code practices
• Practical experience with automated testing
• Experience with REST APIs and third-party API integration
• Exposure to AWS services: EC2, S3, Lambda
• Experience with Temporal or a comparable workflow/orchestration engine
• Practical AI fluency: ability to use AI tools (e.g. Claude, Cursor, Copilot) as part of daily development workflow — for code generation, debugging, and documentation
• Experience collaborating in AI-augmented teams: comfortable working in environments where teammates actively use AI tools and share prompts, workflows, and outputs

What we offer 

• Fully remote work format and flexible working hours.
• Competitive salary pegged to USD.
• 24 days of paid vacation (sick leave, national, religious, and company holidays).
• A friendly communication culture and transparent processes.
• Dynamic work environment.
• Opportunities for professional development and career growth.
• No micromanagement — just trust, ownership, and freedom to experiment.

Hi! We are looking for a Senior Node.js Backend Developer to join our pack at SharksCode 🦈💙
 SharksCode is a Ukrainian IT company that develops high-tech software solutions and B2B platforms, particularly in the iGaming industry.
 We are looking for a Senior Node.js Backend Developer who will work on building scalable backend services and integrations within a distributed architecture. In this role, you will participate in designing and developing platform services, integrating external systems, and contributing to technical decisions that impact the overall product architecture.

We expect that you:
– Have 4+ years of commercial experience with Node.js development.
– Have experience developing REST APIs and/or GraphQL services.
– Have strong proficiency in TypeScript.
– Have hands-on experience with MySQL or PostgreSQL.
– Have experience integrating third-party APIs and services.
– Have experience working with message queues (RabbitMQ, Kafka, or similar).
– Understand distributed systems architecture.
– Have experience using Redis for caching or Pub/Sub mechanisms.

Your future responsibilities:
– Design and develop backend services and product functionality.
– Build and maintain integrations with third-party financial and technical services.
– Develop public payment APIs and internal microservices.
– Participate in technical discussions and architecture decisions related to platform development.
– Ensure high code quality and follow engineering best practices.
– Share knowledge and contribute to the development culture within the team.

Nice to have:
– Experience working with high-load systems, especially with live or real-time data.
– Experience writing automated tests (Unit, Integration, E2E).
– Experience with WebSocket, gRPC, or other real-time technologies.
– Knowledge of architectural patterns such as CQRS, Event Sourcing, or DDD.
– Experience with Docker, Kubernetes, or CI/CD pipelines.
– Experience working in the iGaming or betting industry.

Interview stages:
🤝 Interview with Recruiter.
🧠 Technical Interview.
💙 Offer.

We offer:
🌴 24 paid vacation days, 14 sick days, and 5 days off.
⏰ Flexible start of the working day — from 9:00 to 11:00.
🏥 Medical insurance.
💰 Bonuses and performance-based rewards.
🐶 Office in the center of Kyiv — pets are welcome, we are pet-friendly.
💆 Lounge area in the office to recharge during the day.
🎾 Padel tennis, football, and training at the polygon for those who enjoy active leisure.
📚 Learning compensation, internal meetups and workshops, as well as access to the corporate LMS with courses.
🎁 Corporate currency that can be exchanged for merch, gifts, or additional benefits.

Job Description

• 3+ years of professional software engineering experience
• Strong experience with Node.js and backend system design and development
• Experience with microservices and containerization technologies such as Docker and Kubernetes
• Experience with cloud platforms such as AWS, GCP, or Azure
• Experience working with databases such as PostgreSQL and caching systems such as Redis
• Experience with asynchronous job processing technologies such as BullMQ or similar tools
• Experience building, supporting, and maintaining backend services in production
• Experience working with distributed systems or complex backend services
• Willingness to participate in on-call support
• Strong sense of ownership, responsibility, and communication skills
• Familiarity with workflow orchestration platforms such as Temporal is a plus
• Experience with large-scale data processing is a plus
• Experience in cybersecurity companies or working with security-related products is a plus
• Experience in designing and implementing core algorithms is a plus

Job Responsibilities

• Participate in the full development lifecycle, from technical design to production support
• Design, develop, and maintain scalable backend services using TypeScript and Node.js
• Work with databases, caching systems, message queues, and cloud environments
• Contribute to microservices-based backend architecture and implementation
• Support large-scale data processing and backend integrations
• Collaborate with security researchers, DevOps teams, product engineers, and other backend developers
• Participate in code reviews, technical discussions, and engineering quality improvements
• Support production stability, reliability, and on-call activities when needed

Department/Project Description

Customer is a dynamic seed-stage startup, backed by seed funding from top-tier venture capital firms and industry leaders. The company has already secured partnerships with Fortune 500 companies, which demonstrates strong market trust and confidence in its vision.

The project is focused on building backend services for a security-related product that helps engineering and security teams identify, analyze, and address vulnerabilities in modern software environments.

The role is focused on hands-on backend development, working with cloud-native services, microservices, databases, message queues, and distributed backend systems.

Skill Category

JavaScript

Keyskills - Must Have

• Node.Js
• PostgreSQL
• Docker
• Kubernetes
• AWS
• Azure
• Redis

Keyskills - Nice to Have

• Product Cybersecurity

AttachmentsNo Attachments.

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 are hiring a Senior Full Stack Engineer to join a fast-growing Web3 security startup building real-time risk detection and threat prevention infrastructure for blockchain ecosystems. The platform processes billions of blockchain events across multiple chains, using big data, AI, and advanced monitoring systems to prevent exploits before they happen. This is a high-impact R&D role in the Herzliya office, focused on owning full product flows end-to-end across backend and frontend systems.

Details

Location: Herzliya 

Employment Type: Full-Time Remote 

Experience Level: Senior

Industry: Web3 / Blockchain / Cybersecurity

Tech Stack: Python, NestJS / Node.js, React

Cloud: AWS

Role Overview

As a Senior Full Stack Engineer, you will:

Own major features end-to-end (backend + frontend)

Contribute to system architecture and long-term product vision

Work closely with Product and Design

Help shape engineering standards in an early-stage product environment

Build scalable, high-performance systems handling real-time blockchain data

The first hire is especially critical — expectations go beyond simply matching the JD.

Key Responsibilities

Develop backend services using Node.js (NestJS) and/or Python

Build high-quality frontend components using React

Architect and maintain scalable systems processing blockchain data

Contribute to CI/CD pipelines and cloud deployment workflows

Collaborate cross-functionally with Product and Design

Write clean, maintainable, production-grade code

Use AI tools productively to improve development velocity

Requirements

B.Sc. in Computer Science or equivalent

6+ years of hands-on experience with Node.js and React

Strong React expertise (deep knowledge expected)

Experience with AWS or similar cloud platforms

Experience working with CI/CD pipelines

Strong Git workflow proficiency

Excellent English communication

Strong technical depth — able to go deep in architecture discussions

Independent problem solver with “can-do-everything” mindset

Very Important - Previous Web3 / blockchain experience (highly valued, especially for the first hire)

Experience working with smart contracts, on-chain data, indexing, or blockchain event monitoring

Comfort working in startup environments

Nice to Have

Experience with Python

Experience working closely with Product and Design

Experience in fast-scaling startups

Practical use of AI development tools (Copilot, Claude, etc.)

About the Role:

We are looking for a Senior Backend Engineer to own a risk intelligence and B2B delivery platform at the core of a next-generation futures trading brokerage. This is a full-ownership role — you will design, build, maintain, and improve two tightly coupled services responsible for per-tenant risk execution and multi-protocol client delivery.

What You Will Work On:

• Per-tenant risk algorithm execution, liquidation workflows, and simulation configuration management;
• REST, gRPC, and WebSocket delivery to B2B clients with per-tenant webhook dispatch and outcome configuration;
• NATS JetStream integration: subscribing to risk alerts and position streams, managing backpressure and audit trail integrity;
• Coordination with upstream Rust services and a Python intelligence layer (classification models, surveillance);
• Evolving a unifying backend layer as the platform scales.

Required Skills:

• 5+ years of backend engineering with production systems at scale;
• Strong proficiency in NestJS / TypeScript and the Node.js ecosystem;
• Solid understanding of event-driven architecture (NATS JetStream, Kafka, or Pulsar);
• Experience designing multi-protocol APIs (REST, gRPC, WebSocket) in a B2B context;
• Familiarity with per-tenant SaaS patterns: isolation, config management, webhook delivery;
• Comfort working adjacent to Rust and Python services;
• PostgreSQL 17 + Timescale, Redis 7, S3 Object Lock, audit-grade data patterns (immutable logs, dual-write);
• Strong async written communication skills for a remote-first team.

Nice to Have:

• Background in fintech, trading infrastructure, or trading firm operations;
• Familiarity with pre-trade risk concepts: margin limits, fat finger controls, liquidation sequencing;
• Prior work with colocation or latency-sensitive distributed systems.

Would you like to lead a healthtech/fintech product that integrates directly with U.S. insurance companies?
We’re looking for a Senior/Lead Software Engineer (Node.js, Angular, and .NET) with the potential to lead a team
Remote + Top salary
Let’s discuss the details?

Main Responsibilities

– Develop and maintain features using Angular and Node.js (Express).

– Contribute to backend services and system architecture where applicable.

– Strengthen the team’s backend expertise and engineering maturity.

– Collaborate with engineering and ETL teams on integrations and data-related workflows.

– Participate in architecture discussions, code reviews, and technical decision-making.

– Identify opportunities to improve system scalability, reliability, and maintainability.

– Share knowledge and support other engineers when needed.

Mandatory Requirements

– 5+ years of professional software development experience.

– Strong experience in backend development.

– Hands-on experience with Node.js and Angular.

– Previous or current experience with .NET / C#.

– Experience designing and implementing backend services or APIs.

– Strong problem-solving skills and the ability to work with complex systems.

-Upper-Intermediate English (B2+) or higher.

– Proactive mindset and ability to take ownership of technical solutions.

Will be a plus

– Experience with AWS or other cloud platforms

– Experience working with healthcare systems or regulated environments

– Experience with SQL and/or NoSQL databases (e.g., MySQL, MongoDB)

– Mentorship or technical leadership experience

We offer

– Projects with a modern JS stack (React.js, React Native, Vue.js, Angular, Node.js)

– Work entirely remotely or in our office (Lviv, Kyiv or Krakow).

– Wellness: Medical insurance/sports compensation/ health check-up+flu vaccination at your choice

– Paid vacations and sick leaves, additional days off, relocation bonus

– Education: regular tech talks, educational courses, paid certifications, English classes

– One of the best IT employers in Lviv (or IT service companies in Ukraine) based on DOU rating.

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 and client:
We’re looking for a talented and detail-oriented Node.js/AI engineer with strong experience in AI and Node development. You'll work with the product team to build AI assisted solutions.

Responsibilities:
- Integrate AI services (LLMs - classification systems, zero-shot, text generation, etc) into new and existing application architectures
- Adjust, refine, and version AI prompts and workflows to improve accuracy, reliability, and real-world performance in production systems
- Collaborate with designers, peers, and management to deliver consistent user flows and experiences
- Thoroughly test and debug code, participate in code reviews, provide documentation, and ensure systems meet quality standards

Requirements:
- At least 5+ years of experience as a full-stack engineer/Back-end engineer;
- Hands-on experience integrating AI or ML services into applications, including prompt design and iteration for LLM-based systems;
- A thorough understanding of how model parameters change output;
- Experience integrating third party APIs;
- Strong proficiency with Node.js, Express, etc and building RESTful and event-driven backend services;
- Comfortable working across multiple codebases and projects simultaneously;
- Experience with databases (primarily SQL) and data modeling for real-world applications;
- Attention to detail and strong testing experience.

Nice-to-Have:
- Knowledge of current AI models/services and their tradeoffs and advanced NLP techniques;
- Experience fine tuning models and building advanced chat bots;
- Familiarity with automated, testing frameworks (e.g., Jest, Cypress);
- Experience with monitoring, logging, and production debugging.

What the client offers:
- Competitive salary + performance bonuses;
- Remote‑first, outcome‑driven culture (potential for hybrid in Kyiv);
- Direct access to leadership, fast decisions, zero corporate layers;
- Opportunity to build and lead the AI function as we scale.

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/Aurora/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!