Jobs

Required Technologies:

Node.js, Express.js / Nest.js
JavaScript (ES6+) / TypeScript
SQL (PostgreSQL, MySQL), NoSQL (MongoDB, Redis)
REST API, GraphQL, WebSockets
Git (GitHub/GitLab), Docker (preferred)
Postman for API testing
 

Nice to Have:

Understanding of OOP, SOLID principles, and design patterns
Experience with testing frameworks (Jest, Mocha, Chai)
 

Requirements:

English level: B1 or higher
Strong motivation to learn and develop in backend engineering
 

We Offer:

Interesting and challenging projects
Vast opportunities for professional development
Competitive salary
Friendly team of professionals
Comfortable working environment

# Senior Backend Engineer (Node.js) - AI-Driven Gaming Platform

Location: Remote | Team: AceGuardian at A5 Labs

## About the Role

We're building cutting-edge AI-driven experiences that redefine industry standards in online gaming. As our Senior Backend Engineer, you'll drive technical initiatives across teams to build scalable web applications, in-app solutions, and integrations that power our innovative gaming platform.

## What You'll Build

- Highly-available and performant gaming applications

- Scalable backend systems for global audiences

- MVPs and production-ready solutions for online poker games

- Integration systems with various service providers

- Robust microservices architecture

## Required Skills

- 7+ years backend development (3+ years in senior/lead role)

- Strong Node.js expertise

- Advanced TypeScript/JavaScript knowledge

- REST APIs, GraphQL, gRPC, and WebSockets

- Testing frameworks (Jest)

- Databases (PostgreSQL, MongoDB, DynamoDB)

- Caching and queues (Redis, RabbitMQ, Kafka)

- High-load and concurrent systems

- Microservices and distributed systems

- Security best practices

## Nice to Have
 

- Experience with NestJS

- DevOps and CI/CD pipelines

- Cloud platform expertise (AWS, Cloudflare)

- Background in gaming or high-concurrency applications

## About Us
 

AceGuardian at A5 Labs combines gaming expertise with AI technology to revolutionize both gaming and real-world problem-solving. Our team focuses on building advanced AI agents through reinforcement learning, game-solving, fine-tuning, and planning, tackling challenges like anti-cheat detection and optimal gameplay.

## What We Offer

- Remote-first environment

- Opportunity to work on innovative AI projects

- Collaboration with experts in AI and game development

- Flexible work environment

- Career growth in a fast-growing company

- Supportive and dynamic team
 

Ready to help build the future of AI-powered gaming technology? Join us in creating resilient, scalable systems that power the next generation of online gaming experiences. We'd love to hear from you!

Good day, we have built a Snapchat style platform to help people sell items in bulk and FAST!!!

We have a very talented iOS developer and backend developer and are now looking to hire a new full stack / front end developer to support our new release(s).

Our backend is written in NodeJS and ExpressJS so you must be an expert in NodeJS.  We're also doing some API development so please have good experience here as well.

Other parts of our stack:
- Front end = ReactJS
- Back end = NodeJX
- Code is on Github
- Hosting = AWS EC2
- Web server = NGINX
- Process manager = PM2
- Database = Firesale Real Time DB
- Storage = Firebase Storage
- Ai = OpenAI and Deepgram
- Video/Audio support = FfMpeg

About the Project

We are building a modern platform focused on large-scale data processing for the media & analytics industry. The backend is powered by a microservice architecture with a strong emphasis on performance and scalability.

Your Responsibilities

• Develop and maintain backend microservices using Node.js and TypeScript
• Implement REST APIs, authentication, data processing, and caching
• Write unit/integration tests
• Collaborate with DevOps, product, and QA teams
• Contribute to documentation and clean code practices

Requirements

• 4+ years of experience with Node.js (ideally with TypeScript)
• Solid understanding of REST APIs and SQL databases (especially PostgreSQL)
• Experience with Docker, Git
• Ability to read and understand technical documentation in English

What We Offer

• Vacation: 15 bussines days
• Sick leave: 7 bussines days
• 6 public holidays
• Salary in crypto
• Remote

Akvelon is a known USA company, with offices in places like 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.

We are looking for a skilled Senior FS SDE for a large-scale logistics and maritime industry project. The project focuses on developing innovative software solutions to optimize cargo operations, improve efficiency, and streamline logistics processes for ports and terminals worldwide.

Requirements:

• Proficiency in JavaScript and TypeScript
• Strong experience with Node.js in a backend environment
• Experience with React
• Solid understanding of RESTful APIs and backend architecture
• Familiarity with version control tools, especially Git
• Strong problem-solving skills and attention to detail.
• Excellent communication and teamwork abilities.

Overlap time requirements: 2-3 hrs with PST

Working conditions and benefits:

• Paid vacation, sick leave (without 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
• Flexible working schedule: 8 hours per day, 40 hours per week
• Personal Career Development Plan (CDP)
• Employee support program (Discount, Care, Health, Legal compensation)
• Paid external training, conferences, and professional certification that meets the company’s business goals
• Internal workshops & seminars
• Corporate library (Paper/E-books) and internal English classes.

Looking for an exciting career? Apply now and become part of our success story 🚀

We are looking for a Full Stack Developer with a focus on BackEnd.
Remote work format (We consider candidates who live geographically in Ukraine and do not plan to go abroad)

Requirements:
 

— You have been working with NodeJS 1+ years;
— Have experience with at least one of the NodeJS frameworks (Express, NestJS);
— Experience with SQL/NoSQL: PostgreSQL, MySQL, MongoDB, DynamoDB;
— Experience with various ORM like Sequelize, Type ORM, Prisma ORM;
— Experience with Next.js, React.js will be a plus;
— You have experience with WebSockets;
— Fundamental understanding of OOP principles;
— Upper-intermediate English proficiency, with the ability to effectively communicate technical issues and discuss project requirements.
— Conversational English;

— Experience with AWS (S3, EC2, Cloudfront, Lambdas, Amplify, Cognito etc), Google Cloud Platform will be a plus;

— Familiar with Docker;

— Friendly relationships with Git;

— Microservices and monolithic design patterns knowledges.

Soft Skills:

— Excellent problem-solving skills;

— Strong communication and collaboration abilities;

— Ability to work independently and within a team;

— Detail-oriented and organized.

Cooperation format:
 

- Outstaff, transparent business model, full-time

- Projects via Upwork with foreign clients

We offer:

– Projects with foreign clients

– Growth prospects in FullStack (React, Next.js)

– Frontend mentoring and team support

– Transparent model: outstaffing, stable employment

– Comfortable atmosphere without micromanagement

— Work within a friendly team;

— Fixed salary $

— Paid vacation and sick leave;

— Required technical literature available on demand;
— Do you want a cool workshop, seminar or conference — come, talk and trip!

We are looking for a Full Stack Developer with a focus on Back-End.
Remote work format (We consider candidates who live geographically in Ukraine and do not plan to go abroad)

Requirements:

— 1 year of commercial experience in the industry.

— Full-stack experience designing.

— Excellent JavaScript/TypeScript skills and strong proficiency in React.
— Experience with Next.js will be a plus.

— Familiarity with the MERN stack and experience with Nest.js will be a plus.

— Familiarity with building back-end APIs, monolith and microservice applications.

— Experience using RESTful APIs and basic authentication mechanisms.

— Ability to showcase previous work via live web pages and Github/Gitlab/Bitbucket.‍

— Upper-intermediate English proficiency, with the ability to effectively communicate technical issues and discuss project requirements.

Soft Skills:

— Excellent problem-solving skills;

— Strong communication and collaboration abilities;

— Ability to work independently and within a team;

— Detail-oriented and organized.

Cooperation format:
 

- Outstaff, transparent business model, full-time

- Projects via Upwork with foreign clients

We offer:

– Projects with foreign clients

– Growth prospects in FullStack (React, Next.js)

– Frontend mentoring and team support

– Transparent model: outstaffing, stable employment

– Comfortable atmosphere without micromanagement

— Work within a friendly team;

— Fixed salary $

— Paid vacation and sick leave;

— Required technical literature available on demand;
— Do you want a cool workshop, seminar or conference — come, talk and trip!

We are looking for a Middle/Senior Full-Stack (Node.js + React.js) Developer.

Required:

• At least 4+ years in commercial development;
• English — Intermediate or higher.

Backend:

• Node.js (4 years of commercial experience);
• TypeScript;
• Nest.js;
• MySQL/PgSQL;
• RMQ, Redis;
• SOLID, Patterns knowledge/experience.

Frontend:

• React.js (3 years of commercial experience);
• TypeScript;
• Redux/RTK/Mobx;
• Thunk/Saga;
• Hooks;
• SASS, Bootstrap, or something similar.

We offer:

• Maximum flexibility;
• Professional trainings, conferences and certifications;
• Corporate events and benefits;
• Professional literature;
• English courses;
• Discount program.

OBRIO is an IT company with Ukrainian roots inside Genesis business ecosystem. Our team consists of more than 250 talented professionals whose ambitions and striving for success help us build the best products on the market. We have offices in Kyiv and Warsaw.

We are developing Nebula — the biggest brand in the spiritual niche. Nebula has over 60 million users worldwide and has been ranked as the № 1 lifestyle app of the day in the Apple Store and Play Market in the USA, Canada, and Australia several times. Nebula is available on iOS, Android, and Web.

Our mission is to make people happier by improving the quality of their relationships.

Here are some details we would like to share with you:

• Nebula is #1 in its niche in terms of downloads and revenue targets;
• 60 million users worldwide;
• Users from 50+ countries;
• 4.8 — our average AppStore rating (with more than 215 thousand ratings).
• OBRIO’s achievements and team’s expertise were shared in Tier-1 international and Ukrainian media, organizations, and brands such asForbes Ukraine, TechCrunch, VECTOR, The Next Web, Tech.eu, Entrepreneur Media, Fast Company, AIN, IT Arena, MEGOGO, DOU, Projector Institute.
• OBRIO — a Forbes-recognized lovemark brand with the highest eNPS.
   

Who are we looking for?

To strengthen our team, we are looking for a Lead Back-End Engineer to join our Retention Team and take ownership of the backend strategy, architecture, and performance for user engagement and retention solutions. This is a mission-critical role with direct impact on product performance and user lifetime value.
 

Your impact:

• Provide strong technical leadership and mentorship to backend engineers;
• Design, build, and scale backend architecture focused on retention-related services;
• Ensure high code quality and maintainability through thorough code reviews and technical guidance;
• Collaborate closely with product managers, QA engineers, data analysts, and DevOps to deliver integrated, cross-functional solutions;
• Make informed technology decisions to optimize system performance and scalability;
• Implement and champion CI/CD best practices to improve development efficiency;
• Participate actively in sprint planning and drive sound, strategic technical decisions.
   

About you

• You have 4+ years of backend development experience with a proven track record of leadership
• You are highly skilled in Node.js, PostgreSQL, Redis, and RabbitMQ;
• You excel at collaborating with teams and motivating engineers to deliver their best work;
• You have a proactive, solution-oriented mindset and can navigate ambiguity effectively.

Nice-to-Have: Experience with Grafana, ELK stack, MongoDB, and Go is a plus.
 

 Why OBRIO is the best place to work?

• Unleash Your Ambitions: Our company was built by ambitious people who never settle for less. By joining OBRIO, you’ll have the chance to unleash your own ambitions and achieve your career dreams.
• We don’t just give you opportunities for growth and development, we give you maximum autonomy and believe we can’t do without you and your active thinking.
• Collaborate in a Team Environment: We believe that success is a team effort. When you join OBRIO, you’ll have the chance to collaborate with talented individuals who share your passion for achieving outstanding results.
• At OBRIO, we’ve gathered influential experts, all of whom are open to sharing their knowledge and ready to help solve issues based on their experience. This is the company where you can quickly reach your potential and advance your career.
   

Our benefits:

• Work from the comfort of your home or from one of our offices in Kyiv or Warsaw. The choice is yours!
• Enjoy 20 annual vacation days and unlimited sick leave, all covered by the company;
• Don’t worry about getting the right equipment, we’ve got you covered if necessary;
• Stay healthy with access to a corporate doctor online, and health insurance options in Ukraine or a fixed amount towards insurance abroad after your probation period;
• Keep learning with our extensive corporate library, internal online meetings, and lectures;
• Grow your skills with our training compensation program;
• Take advantage of our supportive corporate culture, including assistance with relocation, advice on legal stay abroad, housing support, and help for third-country nationals;
• Have fun with our online events and team-building activities
   

Here’s what our hiring journey looks like: Initial Screening ➡️ Team Interview ➡️ Skills Assessment ➡️ Final Check ➡️ Job Offer.
 

Let’s team up and reach for the stars together!

What is the project idea?

The project was founded back in 2014 with the goal of connecting private and government universities with regular people like we are. You have a variety of auditoriums, gyms, classrooms, and other venue options available for community use – schedule facility uses and manage requests from the community all in one place.

Just imagine that you’re a football player and you can rent a football field at Harvard to play with your friends. Amazing, right?

What exciting things is the product doing for the community?

The product is transforming the way public and private spaces are discovered, reserved, and used across communities – all online and accessible anywhere.

Requirements and responsibilities

Hard skills

– 3+ years of working experience using Node.js;
– Hands-on experience with MongoDB;
– Experience with Serverless and Lambda functions (pet-project also works);
– Understanding NoSQL (MongoDB, relations, triggers, etc.);
– Experience working with Jira and Confluence (understanding what is A/C, DoD, and Scrum ceremonies);
– Experience in building schemas, validations, and models using Mongoose in Node.js applications;
– Upper-intermediate or higher level of English.
Working hours:
⏰ Important to have the ability to stay till 8-9 pm CET, at least 2-3 times per week.

It would be a plus:

– Experience with other programming languages;
– Experience with MongoAtlas;
– Degree in a technical field.

Responsibilities

– Development of the web application with search functionality;
– Development of the Client application’s structure;
– Direct communication with the development team and customers;
– Participation in sprint planning and task evaluation;
– Ensuring the code tests coverage.

How many stages of the interview are there?

– Interview with the Recruiter – up to 30 min.;
– Interview with PM – up to 30 min.;
– Technical interview – up to 1 hour;
– Interview with the client – up to 1 hour.

We offer

01

Work vibe

• Flexible full-time/part-time hours
• No micromanagement—time logging is for accounting only
• High-quality equipment (MacBook or your own device)
• Dynamic, low-bureaucracy environment
• Team events, swag, and a great crew to hang with
  
  02
• Holidays and leaves
• 20 days of paid annual vacation;
• 15 days of paid sick leaves;
• Possibility to use vacation during probation;
• Days off on all government holidays.
  
  03
• Education
• $100 annual education allowance
• Mentorship program—learn or lead
• English lessons with biannual reviews
• Certification cost reimbursement
• Free access to Udemy courses on request
  
  04
• Perks
• Social package: medical insurance, sports compensation, or psychological training
• IT Club Loyalty card (Lviv IT Cluster)
• No overtime—work-life balance matters
• Transparent payments in EUR/USD, on time every month
• Assistance with military reservation procedure

We’re building Firesale — a platform where sellers create AI-powered listings by simply recording a video. Buyers see beautiful, interactive posts generated automatically. It’s fast, visual, and redefines how products are presented and discovered.

Everything is built from scratch with a modular, service-oriented architecture using NestJS and NextJS.

Watch the intro video (1 min)
📺 https://youtu.be/hU2vJU8fo0w?feature=shared

The ideal candidate profile includes:

• 6+ years of commercial software engineering experience
• 3+ years in a senior-level position
• 3+ years of hands-on backend development experience (NestJS, modular microservices)
• 3+ years of hands-on frontend development experience (React, Next.js)
• Strong grasp of DDD, Clean Architecture, KISS
• Ability to build and own complete features from UI to backend integration
• Self-directed, detail-oriented, and committed to code quality

Nice to have:

• Familiarity with NATS
• Exposure to event-driven systems
• Exposure to CI/CD pipelines (GitHub Actions, Docker)

Role & responsibilities:

• Initial focus on frontend: building key UI flows, interactions, and responsive forms
• Integrate with backend services via REST and SSE
• Help define and maintain architectural consistency and code quality
• Collaborate directly with the founder/CTO, shaping the product from day one

What we offer:

• Modern architecture: no legacy, no shortcuts, full control
• Async collaboration, flexible hours, remote-first
• Direct impact: everything you build will ship to real users
• Fast feedback loop, deep technical discussions, and strong product/tech alignment
• Opportunity to grow into a core engineering or lead role

Backend Developer (NestJS + Web3)

🚀 Alton is building a cutting-edge DeFi & SocialFi platform on the TON blockchain. We are looking for a Backend Developer to help us scale our infrastructure and build the backend logic behind our Web3 platform.

🔧 Responsibilities

• Develop and maintain backend services using NestJS
• Work with PostgreSQL and Redis for core data storage and caching
• Help integrate ClickHouse for advanced analytics (coming soon)
• Collaborate with the frontend, smart contract, and data teams
• Design scalable APIs and systems for the DEX and other DeFi products

✅ Requirements

• 1.5+ years of experience in backend development with NestJS
• Solid experience with PostgreSQL and Redis
• Understanding of scalable API architecture and microservices
• Basic knowledge of Web3 and smart contract interactions
• Familiarity with working in TypeScript-based environments

🌐 Nice to have

• Experience or understanding of:
  • TON blockchain, particularly working with blueprints and ton/core
  • ClickHouse or similar analytical DBs
  • Rust, Tokio, or Axum (bonus for data engineers)
  • Web3 libraries and blockchain indexing tools

💎 What we offer

• Remote-first and flexible working conditions
• Work with a passionate, agile team aiming to build a Web3 unicorn
• Deep involvement in TON and DeFi ecosystems
• Token Option plan (early contributor allocation)
• Opportunity to shape technical architecture and backend design from early stages

📍 Location

Remote / Hybrid (negotiable)

💬 Ready to build the future of DeFi?

Apply on Djinni or drop us a message — we’d love to talk!

We're building cutting-edge AI-driven experiences that redefine industry standards in online gaming. As our Backend Engineer, you'll drive technical initiatives across teams to build scalable web applications, in-app solutions, and integrations that power our innovative gaming platform.

A must have for this job is a bachelors degree in a technical domain (preferably Computer Science) and 2 years of full-time experience with backend development (at least one year with Node.js).

## What You'll Build

- Highly-available and performant gaming applications

- Scalable backend systems for global audiences

- MVPs and production-ready solutions for online poker games

- Integration systems with various service providers

- Robust microservices architecture

## Required Skills

- 3+ years backend development

- Advanced TypeScript/JavaScript knowledge

- REST APIs, GraphQL, gRPC, and WebSockets

- Testing frameworks (Jest)

- Databases (PostgreSQL, MongoDB, DynamoDB)

- Caching and queues (Redis, RabbitMQ, Kafka)

- High-load and concurrent systems

- Microservices and distributed systems

- Security best practices

## Nice to Have
 

- Experience with NestJS

- DevOps and CI/CD pipelines

- Cloud platform expertise (AWS, Cloudflare)

- Background in gaming or high-concurrency applications

## About Us
 

AceGuardian at A5 Labs combines gaming expertise with AI technology to revolutionize both gaming and real-world problem-solving. Our team focuses on building advanced AI agents through reinforcement learning, game-solving, fine-tuning, and planning, tackling challenges like anti-cheat detection and optimal gameplay.

## What We Offer

- Remote-first environment

- Opportunity to work on innovative AI projects

- Collaboration with experts in AI and game development

- Flexible work environment

- Career growth in a fast-growing company

- Supportive and dynamic team
 

Ready to help build the future of AI-powered gaming technology? Join us in creating resilient, scalable systems that power the next generation of online gaming experiences. We'd love to hear from you!

🟡 Requirements:

• Minimum 2+ year of commercial experience with React and Node
• Experience in developing and maintaining database-related solutions
• Ability to read and clearly understand technical requirements and acceptance criteria (AC)

• English proficiency at Intermediate+ level

   

🟡 Would be a plus:

• Experience with TypeScript
• Experience with PostgreSQL & MongoDB
• Experience working with Slack API, Jira API, or MS Teams API

• Familiarity with Docker

   

   

🟡 Responsibilities:

• Participate in team ceremonies such as daily standups, sprint reviews, retrospectives, and backlog refinement
• Provide regular updates on progress and blockers
• Perform code reviews of teammates’ work
• Understand and implement features based on acceptance criteria and requirements

• Propose and implement technical solutions tailored to the problem context

   

🟡 Conditions:

• Full-time position, flexible hours
• Mentoring and career development
• Remote work
• State holidays
• 15 days of paid vacation per year
• 10 days of paid sick leave per year
• English study compensation
• We are ready to invest in your education
• Performance reviews

We are building a cutting-edge financial white-label platform that empowers businesses and individuals to manage their finances seamlessly. Our platform integrates state-of-the-art technology to offer:

• A neo-banking experience with mobile apps operating over robust payment gateways.
• Open and closed-loop mobile wallets.
• Embedded KYC modules for user data collection and validation.
• Virtual card support with payment capabilities at physical and online merchants.
• Advanced business tools: team management, invoicing, QR-code payments, and real-time analytics.
• A currency exchange feature with real-world rate integration.

Our system is designed with scalability and performance in mind, employing a microservices architecture powered by NestJS, RabbitMQ, and PostgreSQL, with Kubernetes and Docker as key enablers for flexible deployment.

We are looking for a highly skilled Senior Back-End Developer to join our team and contribute to the next phase of our product development. 

If you are passionate about crafting high-quality, scalable systems and enjoy working in a fast-paced, innovative environment, we want to hear from you!

Your Responsibilities

• Design, develop, and optimize back-end services using TypeScript and NestJS within a microservices architecture.
• Build and integrate secure APIs for payment gateways, KYC modules, and business functionalities.
• Collaborate closely with cross-functional teams, including front-end, mobile, and DevOps, to ensure seamless integration and high performance.
• Optimize database design and queries for PostgreSQL to handle high transaction volumes.
• Implement robust messaging solutions using RabbitMQ.
• Ensure the security and compliance of the system with financial industry standards.
• Contribute to architectural decisions and guide best practices for back-end development.

Your Skills and Experience

• 4+ years of professional experience in back-end development, with a focus on TypeScript and NestJS.
• Strong expertise in microservices architecture and message brokers (RabbitMQ or similar).
• Advanced knowledge of relational databases, particularly PostgreSQL (optimization, indexing, and migrations).
• Experience with containerization and orchestration tools: Docker and Kubernetes.
• A solid understanding of API security, encryption, and authentication mechanisms (OAuth2, JWT).
• Proven track record of delivering high-performance, scalable systems in a production environment.
• Familiarity with CI/CD pipelines and cloud platforms (AWS, Azure, or GCP) is a plus.
• Excellent problem-solving skills and the ability to mentor junior team members.

What We Offer

• A unique opportunity to work on a high-impact, innovative financial platform.
• Competitive salary and performance-based bonuses.
• Flexible working hours and remote-first culture.
• Opportunities for professional growth and technical leadership.
• A collaborative and inclusive team environment.

Join us in reshaping the future of financial technology. Apply now to make your mark!