Candidates 232
$5000
/ mo
≈ $60000 /
year
Node.js
·
5 years of experience
·
C1 - Advanced
·
Published
today
Poland
·
Only remote
Full Stack Engineer with 5 years of experience building product-critical systems across Web3, travel booking and enterprise traceability domains. Focused on services that affect revenue, retention, booking reliability and operational transparency. Strong in backend architecture, blockchain integrations, distributed data flows and production delivery, with a track record of improving conversion, reducing errors and scaling systems under real user load.
Skills
Node.js
5y
TypeScript
5y
JavaScript (ES6+)
5y
Solidity
5y
Blockchain
5y
AWS
5y
GCP (Google Cloud Platform)
5y
Nest.js
5y
Express.js
5y
Fastify
5y
+ 16 more
React.js
5y
Next.js
5y
RabbitMQ
5y
PostgreSQL
5y
MongoDB
5y
ClickHouse
5y
Apache Kafka
5y
Elasticsearch
5y
Kubernetes
4.5y
Nginx
4.5y
Claude Code
3y
Codex
3y
Cursor
3y
Opencode
3y
Google Antigravity
3y
Gemini
3y
$4000
/ mo
≈ $48000 /
year
Node.js
·
5 years of experience
·
B2 - Upper Intermediate
·
Published
today
Poland
·
Only remote
Vention | Software Engineer (Full-stack) 10/2023 - Present
Project: ARDF Competition Management Platform
- Co-led monolith-to-microservices migration, designing service boundaries through event storming with the tech lead, eliminating GPS streaming latency spikes during live competitions.
- Designed and executed load testing scenarios using k6, uncovering a 31% request failure rate, identifying performance bottlenecks, and preventing a production incident during peak competition trac.
- Implemented new platform features including an IAM service (NestJS/TypeScript) with ES256 JWT issuance and JWKS rotation, and an OpenResty/Lua API gateway handling JWT verification, header injection and anti-spoofing protection.
Oxygen Tools | Software Engineer (Backend) 04/2022 - 09/2023
Project: Trading Automation Platform
- Designed and developed a unified backend engine for executing digital asset trades across multiple exchange platforms (DEX and CEX).
- Built transport-agnostic communication layers with fault-tolerant HTTP and WebSocket clients.
- Introduced fail-safe and circuit-breaker mechanisms to safeguard assets during market disruptions, with real-time monitoring and automated emergency response.
Freelance | Full-Stack Developer
Project: Gaming Platform Tool (NDA) 02/2021 - 02/2022
- Developed a desktop application using Electron and React, focusing on modularity and performance.
- Built a web-based admin panel for internal platform management (content, analytics, access control), utilizing Next.js and Feature-Sliced Design.
- Improved UI performance through list virtualization and optimized data-processing routines.
Project: ARDF Competition Management Platform
- Co-led monolith-to-microservices migration, designing service boundaries through event storming with the tech lead, eliminating GPS streaming latency spikes during live competitions.
- Designed and executed load testing scenarios using k6, uncovering a 31% request failure rate, identifying performance bottlenecks, and preventing a production incident during peak competition trac.
- Implemented new platform features including an IAM service (NestJS/TypeScript) with ES256 JWT issuance and JWKS rotation, and an OpenResty/Lua API gateway handling JWT verification, header injection and anti-spoofing protection.
Oxygen Tools | Software Engineer (Backend) 04/2022 - 09/2023
Project: Trading Automation Platform
- Designed and developed a unified backend engine for executing digital asset trades across multiple exchange platforms (DEX and CEX).
- Built transport-agnostic communication layers with fault-tolerant HTTP and WebSocket clients.
- Introduced fail-safe and circuit-breaker mechanisms to safeguard assets during market disruptions, with real-time monitoring and automated emergency response.
Freelance | Full-Stack Developer
Project: Gaming Platform Tool (NDA) 02/2021 - 02/2022
- Developed a desktop application using Electron and React, focusing on modularity and performance.
- Built a web-based admin panel for internal platform management (content, analytics, access control), utilizing Next.js and Feature-Sliced Design.
- Improved UI performance through list virtualization and optimized data-processing routines.
Skills
JavaScript
5y
TypeScript
5y
React.js
4y
Next.js
2y
Node.js
5y
Nest.js
5y
Express.js
5y
Electron.js
1.5y
PostgreSQL
3y
SQLite
3y
+ 8 more
MongoDB
1y
REST API
5y
SSE & WebSocket real-time server state management
5y
AWS
3y
Docker
5y
Nginx
3y
k6
3y
Microservices
3y
$500
/ mo
≈ $6000 /
year
Node.js, Fullstack
·
1 year of experience
·
B1 - Intermediate
·
Published
today
Poland
·
Only remote
I am working on creating a note-taking app as my pet project. In this app each user can create a personal account and interact with it. The frontend consists of several pages, including authentication, registration, and a notes page. The backend implements CRUD operations (create, read, update, delete) for managing user notes.
Looking for
I expect to work in a friendly and supportive team where I can develop my skills. Also, I am looking to gain more hands-on experience in building web applications and work with modern technologies.
Skills
Node.js
JavaScript
CSS
HTML
React.js
MongoDB
Git
TypeScript
Express.js
Nest.js
$3000
/ mo
≈ $36000 /
year
Node.js
·
5 years of experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Office or remote
Backend Developer with 5 years of commercial experience building scalable web applications using Node.js, TypeScript, and NestJS. Experienced in designing and developing REST APIs, implementing complex business logic, working with PostgreSQL, Redis, and AWS, and building production-ready systems from scratch.
Worked on both greenfield products and large-scale applications, including microservices, asynchronous processing, payment integrations, reporting systems, and cloud infrastructure. Strong focus on clean architecture, maintainable code, testing, and delivering reliable solutions that provide real business value.
I use AI agents to work more efficiently - accelerating development, code review, and debugging while keeping full ownership of architecture and code quality.
I am looking for an opportunity to contribute my backend expertise to a product-focused team while continuing to grow technically and take ownership of impactful features.
Worked on both greenfield products and large-scale applications, including microservices, asynchronous processing, payment integrations, reporting systems, and cloud infrastructure. Strong focus on clean architecture, maintainable code, testing, and delivering reliable solutions that provide real business value.
I use AI agents to work more efficiently - accelerating development, code review, and debugging while keeping full ownership of architecture and code quality.
I am looking for an opportunity to contribute my backend expertise to a product-focused team while continuing to grow technically and take ownership of impactful features.
Skills
Node.js
TypeScript
Nest.js
MongoDB
PostgreSQL
Docker
AWS
REST API
Git
Elasticsearch
+ 7 more
Jest
Mongoose
TypeORM
Prisma ORM
Linux
Vue.js
Stripe
Domains
Doesn’t consider: Adult, Gambling
$7000
/ mo
≈ $84000 /
year
Node.js
·
6 years of experience
·
C1 - Advanced
·
Published
yesterday
Poland
·
Office or remote
Hands-on experience with media, bank applications. Application system architecture development. Also performance improvements, bug fixes, active participation in code analysis. Participation in scrum ceremonies and other events
Technologies Stack:
Node Js / Express.js - 6 years
GraphQL / Apollo Server - 3 years
JavaScript ES6+ / TypeScript - 6 years
Nest.js - 5 years
Koa.JS - 3 years
WebSockets / Socket.io – 3 years
OnBoarding.js - 2 years
Web3.js , Ethers.js – 2 years
Jest – 5 years
Prisma,Sequelize - 5 years
TypeORM - 4 years
PostgreSQL - 6 years
MySQL - 5 years
ClickHouse – 3 years
NoSQL - 5 years
Redis - 3 years
RabbitMQ - 2 years
Firebase,AWS - 5 years
Docker - 5 years
Kubernetes - 2 years
Nginx - 4 years
HaProxy - 2 years
Cron - 3 years
Jenkins,ElasticSearch - 1.5 year
Technologies Stack:
Node Js / Express.js - 6 years
GraphQL / Apollo Server - 3 years
JavaScript ES6+ / TypeScript - 6 years
Nest.js - 5 years
Koa.JS - 3 years
WebSockets / Socket.io – 3 years
OnBoarding.js - 2 years
Web3.js , Ethers.js – 2 years
Jest – 5 years
Prisma,Sequelize - 5 years
TypeORM - 4 years
PostgreSQL - 6 years
MySQL - 5 years
ClickHouse – 3 years
NoSQL - 5 years
Redis - 3 years
RabbitMQ - 2 years
Firebase,AWS - 5 years
Docker - 5 years
Kubernetes - 2 years
Nginx - 4 years
HaProxy - 2 years
Cron - 3 years
Jenkins,ElasticSearch - 1.5 year
Highlights
Developed a robust and scalable architecture to handle largeamount of trac and data. Working with complex and non-trivial tasks. Fixes and support for existing applications with performance improvements
Looking for
Finished my contract with the last company and now looking for a new job where I can show my skills as an experienced and mature professional and team player.
Skills
JavaScript
6y
Node.js
6y
AWS
5y
TypeScript
6y
SQL початковий рівень
6y
NoSQL
4y
React.js
4y
Redis
3y
REST API
6y
RabbitMQ
3y
+ 6 more
PostgreSQL
6y
Kafka
1y
WebSockets
3y
Claude Code
Cursor
Codex
Domains
Domain experience: Education, Fintech
$5000
/ mo
GROSS
≈ $60000 /
year gross
Node.js
·
More than 10 years of experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Office or remote
Languages: Node.js, TypeScript/JavaScript, PHP, Python
Frameworks: Express.js, Next.js, Nest.js (TypeORM), Laravel (Eloquent)
Frontend: React, Redux Toolkit, Zustand, Bootstrap, Tailwind
Mobile: React Native (Expo, Bare)
SQL: MySQL, PostgreSQL, ClickHouse
NoSQL: Redis, MongoDB
Message Brokers: RabbitMQ, Redis PubSub, Redis Streams
Delivery: Docker, Docker Compose, Kubernetes
Cloud: AWS, GCP, Firebase
Version Control: Git, GitHub, GitLab
Blockchain: Bitcoin, Ethereum, Smart Contracts, Web3
Frameworks: Express.js, Next.js, Nest.js (TypeORM), Laravel (Eloquent)
Frontend: React, Redux Toolkit, Zustand, Bootstrap, Tailwind
Mobile: React Native (Expo, Bare)
SQL: MySQL, PostgreSQL, ClickHouse
NoSQL: Redis, MongoDB
Message Brokers: RabbitMQ, Redis PubSub, Redis Streams
Delivery: Docker, Docker Compose, Kubernetes
Cloud: AWS, GCP, Firebase
Version Control: Git, GitHub, GitLab
Blockchain: Bitcoin, Ethereum, Smart Contracts, Web3
Highlights
Total 20+ years in ITEarly 1990s – First computer: ZX Spectrum, TR-DOS, BASIC (age 8)
Mid 1990s – 80286/80486 PCs, MS-DOS, Windows 3.x (age 12)
2001 – Started learning Turbo Pascal
2003 – Created first website in Dreamweaver
2004 – Created a popular (city-wide) social networking platform (written in PHP and MySQL)
2008 – Team Lead, development of a widely used travel booking platform
2010 – Created a popular (top 3) WordPress plugin
2015 – Team Lead, R&D of an online entertainment platform
2023 – Tech Lead, development of a payment processing platform
Looking for
Backend-focusChallenging projects, possibility to grow
Also may consider part-time offers (3-5 hours/day)
Skills
Node.js
7y
TypeScript
6y
React.js
6y
React Native
5y
Nest.js
4y
JavaScript
10+y
PHP
10+y
Laravel
10+y
Fullstack
10+y
Python
2y
+ 3 more
Claude Code
Codex
Cursor
Domains
Domain experience: Fintech, Blockchain / Crypto, Mobile, E-commerce / Marketplace, Advertising / Marketing, Travel / Tourism, Automotive, Media, Dating, SaaS, Gambling
$5000
/ mo
≈ $60000 /
year
Node.js, Fullstack
·
6 years of experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Only remote
I’m a software engineer with over 6 years of production experience in web & mobile development. During this time, I have participated in many projects of different scales and complexity. I specialize in JavaScript application disign and implementation, including the front-end and back-end. In all projects, I was engaged in development and troubleshooting.
Highlights
I am a tech lead of a small team that responcible for developing and meaitaing whole product. From designing and implementing new fatures to CI/CD. My biggest achivment so far was disign and delivering to production complex product on my own.
Looking for
I would like to work with great people on a great product that I can be proud to be part of.
Skills
Node.js
6y
TypeScript
6y
JavaScript
10y
CSS
10y
OOP
REST API
PostgreSQL
Nest.js
React.js
Git
+ 5 more
MongoDB
3y
JavaScript (ES6+)
Express.js
AWS
MySQL
3y
Domains
Domain experience: Energy / Utilities
Doesn’t consider: Adult, Gambling
$7000
/ mo
≈ $84000 /
year
In passive search
Node.js, PHP
·
10 years of experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Only remote
I'm PHP/JS developer with extensive experience in building high-quality web-applications. I have 8+ years of experience in developing using PHP, NodeJS and React.
I have been working as a freelancer for about 4 years; 8 years working at Ukrainian IT-companies. So I have experience in working either in a team or by myself.
I'm easy communicator and can help you even if you have just a rough idea. My customers say it is very comfortable to work with me because I do a job of high quality, meet deadlines and understand business tasks.
I have been working as a freelancer for about 4 years; 8 years working at Ukrainian IT-companies. So I have experience in working either in a team or by myself.
I'm easy communicator and can help you even if you have just a rough idea. My customers say it is very comfortable to work with me because I do a job of high quality, meet deadlines and understand business tasks.
Looking for
* Interested in working remotely* Not interested in Magento propositions
Skills
PHP
JavaScript
Git
Laravel
MySQL
Yii
Linux
CSS
Docker
React.js
+ 7 more
TypeScript
Node.js
Nest.js
Next.js
Microservices
AWS
AWS CloudFormation
$5500
/ mo
≈ $66000 /
year
Node.js
·
9 years of experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Only remote
Senior Backend Engineer | Node.js Specialist
Software Engineer with 9 years of experience in building high-performance backend systems and scalable architectures. I am a product-minded engineer who views technology as a tool to solve business challenges efficiently. My core philosophy is Pragmatic Architecture: I advocate for robust Modular Monoliths as a starting point, while possessing deep expertise in transitioning to Distributed Systems and Microservices when the scale demands it.
Technical Expertise:
- Runtime & Languages: Node.js (Expert), NestJS, TypeScript, Express.
- Data & Storage: * PostgreSQL Specialist: Schema design, Query optimization (EXPLAIN ANALYZE), Window Functions, Transactions, and Locking mechanisms.
- NoSQL & Search: MongoDB, Redis, ElasticSearch (Full-text search, complex filtering).
- ORMs: TypeORM, Mongoose.
- Messaging: AWS SNS/SQS, RabbitMQ, Kafka(Base knowledge).
- Google Pub/Sub: Integration for cross-platform event handling.
- Cloud & Infrastructure: AWS (S3, Lambda, CloudFront, SNS, SQS), Docker/Docker compose, Logging(Sentry, etc), OpenTelemetry.
- Frontend: React.
- Third-party Ecosystems: Stripe (Payments & Idempotency), Google Meet API, OpenAI API, Recall.ai, KYC(Jumio), Google/Apple/Fb API's, RevenueCat, Google/Apple pay, etc...
Domain Experience:
- MedTech/Telehealth: Integration of video consultations, scheduling, and AI analytics.
- EdTech & E-learning: CRM systems for course management and legal firm support.
- Real Estate & E-commerce: Property management, marketplaces, and cleaning service platforms.
- SaaS & ERP: Internal business activity management and high-complexity subscription engines.
Software Engineer with 9 years of experience in building high-performance backend systems and scalable architectures. I am a product-minded engineer who views technology as a tool to solve business challenges efficiently. My core philosophy is Pragmatic Architecture: I advocate for robust Modular Monoliths as a starting point, while possessing deep expertise in transitioning to Distributed Systems and Microservices when the scale demands it.
Technical Expertise:
- Runtime & Languages: Node.js (Expert), NestJS, TypeScript, Express.
- Data & Storage: * PostgreSQL Specialist: Schema design, Query optimization (EXPLAIN ANALYZE), Window Functions, Transactions, and Locking mechanisms.
- NoSQL & Search: MongoDB, Redis, ElasticSearch (Full-text search, complex filtering).
- ORMs: TypeORM, Mongoose.
- Messaging: AWS SNS/SQS, RabbitMQ, Kafka(Base knowledge).
- Google Pub/Sub: Integration for cross-platform event handling.
- Cloud & Infrastructure: AWS (S3, Lambda, CloudFront, SNS, SQS), Docker/Docker compose, Logging(Sentry, etc), OpenTelemetry.
- Frontend: React.
- Third-party Ecosystems: Stripe (Payments & Idempotency), Google Meet API, OpenAI API, Recall.ai, KYC(Jumio), Google/Apple/Fb API's, RevenueCat, Google/Apple pay, etc...
Domain Experience:
- MedTech/Telehealth: Integration of video consultations, scheduling, and AI analytics.
- EdTech & E-learning: CRM systems for course management and legal firm support.
- Real Estate & E-commerce: Property management, marketplaces, and cleaning service platforms.
- SaaS & ERP: Internal business activity management and high-complexity subscription engines.
Highlights
Selected Engineering Case Studies1. Event-Driven Telehealth Ecosystem (MedTech/AI)
The Challenge: Orchestrating a complex flow between payments, scheduling, and AI-driven analytics with high reliability and no data loss.
The Solution: Engineered a resilient pipeline integrating Stripe, Google Meet, and OpenAI.
Implemented a webhook-based state machine to manage session lifecycles (locking slots, handling payment timeouts, and automated scheduling).
Built an asynchronous processing flow using Google Pub/Sub and Recall.ai to capture session recordings and trigger an automated AI pipeline for transcription and summarization (GPT-4 API).
Ensured system stability through idempotent webhook handling and distributed locking.
2. Scalable Media Delivery & I/O Offloading (Cloud Infrastructure)
The Challenge: Reducing backend load and storage costs for high-volume image processing and file management.
The Solution: Architected a Serverless Media Pipeline that decoupled file I/O from the core Node.js application.
Implemented secure direct-to-S3 uploads using Presigned URLs, eliminating the bottleneck of multipart uploads through the main API.
Developed an on-demand image transformation service using AWS Lambda and CloudFront. This allowed for real-time resizing and cropping based on URL parameters with edge-level caching, significantly reducing storage overhead and improving global latency.
Looking for
Role: Senior Backend Engineer. I’m looking for a position where I can balance architectural decision-making with active development.Ideal Project: A product-driven company facing scalability challenges or building complex distributed systems.
Domains: FinTech, SaaS, MedTech, Marketplace, or E-commerce.
Comfortable with EU, UK, or Ukraine timezones (± 2 hours).
Skills
Node.js
9y
Nest.js
5y
Express.js
TypeScript
8y
JavaScript
9y
React.js
PostgreSQL
6y
TypeORM
5y
Elasticsearch
Redis
+ 10 more
RabbitMQ
WebSockets
Firebase
Docker
6y
Microservice architecture
Amazon AWS
AWS Lambda
AWS SQS
AWS SNS
Stripe
$100
/ mo
≈ $1200 /
year
Node.js
·
No experience
·
B2 - Upper Intermediate
·
Published
yesterday
Poland
·
Only remote
I've been working on personal backend projects focused on Node.js and Express. My main project is a veterinary clinic backend system where I designed REST APIs, handled database structure, authentication logic, and general application architecture. I also built an air quality manager project that processes and organizes environmental data. Through these projects I gained practical experience with JavaScript, Node.js, Express, PostgreSQL, Git, and Docker.
I mainly work independently, which taught me problem-solving, debugging, and writing structured, maintainable code. I pay attention to API design, data flow, and backend stability. Currently I want to improve my skills in scalable backend architecture, database optimization, automated testing, and gradually move toward fullstack development with React. My goal is to grow into a strong engineer who can work on real production systems in a team environment.
I mainly work independently, which taught me problem-solving, debugging, and writing structured, maintainable code. I pay attention to API design, data flow, and backend stability. Currently I want to improve my skills in scalable backend architecture, database optimization, automated testing, and gradually move toward fullstack development with React. My goal is to grow into a strong engineer who can work on real production systems in a team environment.
Skills
Node.js
Express.js
PostgreSQL
Docker
Git
HTML/CSS