Jobs

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

About us:
Cowchain have successfully completed 120+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.

Required skills:
— At least 3-year commercial experience in the Backend development
— Node.js experience is A MUST
— Ability to use Solscan to analyze data;
— Compiling, signing and sending transfer transactions;
— Compiling, signing and sending swap transactions;
— Transaction mult-signatures
— Pump.fun / Jupiter / Raydium;
— Bignumber.js / bn.js
— Understanding of gas, priority fee, token account creation
— Meme-coin creation Pump.fum/Meteora
— JIRA, gitflow

Tech stack:
— Node.js, Nest.js, Microservices
— MYSQL, MSSQL, PostgreSQL
— TheGraph (Subgraph), Event indexing back-end
— Azure, AWS, Google Cloud
— Docker, Kubernetes

Will be a plus:
— EVM-based blockchains (Ethereum, Avalanche, Polygon, Binance Smart Chain, Velas, Hedera etc)

What will you do:
— New features development;
— Bugfixes and support existing solutions;
— Participate in project architecture discussions;
— Build solutions from scratch as well as join on-going development process;
— Have fun)

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

FAVBET Tech develops software that is used by millions of players around the world for the international company FAVBET Entertainment.
We develop innovations in the field of gambling and betting through a complex multi-component platform which is capable to withstand enormous loads and provide a unique experience for players.
FAVBET Tech does not organize and conduct gambling on its platform. Its main focus is software development.

Main areas of work:

• Betting/Gambling Platform Software Development — software development that is easy to use and personalized for each customer;
• Highload Development — development of highly loaded services and systems;
• CRM System Development — development of a number of services to ensure a high level of customer service, effective engagement of new customers and retention of existing ones;
• Big Data — development of complex systems for processing and analysis of big data;
• Cloud Services — we use cloud technologies for scaling and business efficiency.

Requirements:

• 4+ years of commercial experience in Node.js (Fastify/Koa/NestJS would be a +).
•    Strong skills in relational and NoSQL databases (PostgreSQL, MySQL, Redis, MongoDB).
•    Strong expertise in TypeScript.
•    Experience with CDN implementation and performance optimization
•    Unit/integration/load tests
•    Understanding of design patterns, clean architecture.

•    Proven track record in developing scalable, enterprise-level solutions

   

  Responsibilities :

•   Implementation of API migration to a new approach
•    Development of new features and new parts of the services
•    Handling complex problems that might arise during solution development and provide field support with creative and rapid solutions  
•    Constantly improving code organization and evolving application design
•    Writing new and updating existing integration tests

We offer:

• 30 days off per year (vacation and sick days) — we value rest and recreation. We also comply with the national holidays.
• Medical insurance for employees and the possibility of training employees at the expense of the company and gym membership.
• Remote work; after Ukraine wins the war — our own modern lofty office with spacious workplace, and brand-new work equipment (near Pochaina metro station).
• Flexible work schedule — we expect a full-time commitment but do not track your working hours.
• Flat hierarchy without micromanagement — our doors are open, and all teammates are approachable.

During the war, the company actively supports the Ministry of Digital Transformation of Ukraine in the initiative to deploy an IT army and has already organized its own cyber warfare unit, which makes a crushing blow to the enemy’s IT infrastructure 24/7, coordinates with other cyber volunteers and plans offensive actions on its IT front line.

About the Role

We are seeking a talented and experienced Senior Node.js Developer to join our growing team. In this role, you will lead the backend development of scalable web applications and APIs, contribute to architecture decisions, and mentor junior developers. You should have a deep understanding of server-side JavaScript and a strong grasp of modern web development practices.

Key Responsibilities

• Design, develop, and maintain backend services and APIs using Node.js.
• Collaborate with front-end developers, DevOps, and product teams to deliver high-quality features.
• Optimize application performance and scalability.
• Write clean, efficient, and well-documented code.
• Participate in code reviews and provide mentorship to junior developers.
• Ensure best practices in security and data protection are followed.

• Stay current with emerging technologies and development trends.

   

Requirements

• 6+ years of professional experience in Node.js development.
• Strong knowledge of JavaScript (ES6+), asynchronous programming, and RESTful API design.
• Experience with frameworks such as Express.js or NestJS.
• Proficiency in working with databases (SQL and NoSQL).
• Familiarity with Git, CI/CD pipelines, and cloud platforms (AWS, GCP, or Azure).
• Solid understanding of software engineering principles and Agile methodologies.

• Strong communication and teamwork skills.

   

Nice to Have

• Experience with TypeScript.
• Knowledge of GraphQL, WebSockets, or Microservices architecture.
• Familiarity with Docker and container orchestration (e.g., Kubernetes).

Benefits

• Competitive salary and performance bonuses.
• Flexible working hours and remote options.
• Professional development and learning opportunities.
• Collaborative and inclusive team culture.

A fast-growing fintech startup building cutting-edge blockchain solutions looking for an experienced Backend Developer( Node.js Developer (NestJS) | Fintech, Blockchain, Highload) to join our remote team.. We work at the intersection of finance, crypto, and highload systems

Tech stack we use:

Node.js, NestJS, Kafka, RabbitMQ
MongoDB, PostgreSQL, Redis
Docker, Kubernetes, Web3
Microservices, CI/CD

Requirements:

• 2+ years of commercial experience with Node.js and NestJS
• Strong understanding of microservice architecture principles
• Hands-on experience with Kafka or RabbitMQ
• Experience working with databases: MongoDB, PostgreSQL, Redis
• Solid background in fintech, blockchain, or highload projects (ideally more than one)
• Good grasp of asynchronous processes and ability to write async code
• Experience building REST APIs and working with WebSocket/Socket.IO (WS/WSS)
• Confident Git and Gitflow user
• Ability to read and work with existing codebase
• Skilled in logging and debugging

Nice to have:

• Experience with TypeScript
• Understanding of Docker and CI/CD
• Exposure to Web3 integrations

 What we offer:

• Fully remote work
• Flexible working hours
• Direct access to C-levels — your ideas matter here
• Open-minded team always ready to test new tech

• Gifts on special occasions

   

AIstats is an innovative ecosystem of football products, combining advanced big data analysis and computer vision technologies. Our goal is to enhance football understanding for fans and create new game analysis opportunities for professionals.

We are a fast-growing team of 30 people based in Poland. Recently, we secured investments from Google executives and leading mobile company founders, which helped us increase our company’s value fourfold in the past year.

Our Products

• AIstats Mobile App – a consumer product for fans and bettors, which has already reached 100K MAU since its launch in September.

• AIstats Business Solutions – analytics tools powered by ML models and computer vision technologies, helping clubs and scouts make more informed decisions.

   

Team Culture and Values

AIstats is the place for those who want to transform the industry! We are building a long-term business to lead football analytics. Our goal is not just to create a product but to build an entire ecosystem. We value ambition, responsibility, and a results-driven mindset. At AIstats, there’s no micromanagement - only trust, autonomy, and freedom to experiment. We work top-down, focus on big goals, and seek people ready to make a real impact.

Job Overview

We are currently looking for a talented Backend Developer to join our growing team.

Key Responsibilities

• Development of new HTTP and WebSocket endpoints with integration of third-party APIs (REST/gRPC/GraphQL - depending on tasks).
• Writing unit and integration tests to ensure correct operation of APIs, including boundary cases and work with external services.
• Performing load testing and code profiling to identify bottlenecks and improve performance.

• Working closely with frontend, analytics and product teams - from discussing specifications to implementing solutions in production.

   

Requirements

Must have:

• Strong knowledge of Node.js and TypeScript, experience in REST/WebSocket API development.
• Strong working knowledge of Redis, including usage for caching, pub/sub messaging, and real-time analytics.
• Experience with microservice architecture and interaction between services via RabbitMQ, Redis, TCP connections.
• Knowledge of PostgreSQL (query writing, indexing, transactions, migrations).
• Experience with Docker, understanding of how docker-compose works.
• Proficiency with Socket.io, understanding of its features (e.g., rooms, reconnect, persistence, etc.).

• Experience in configuring logging, debugging and profiling backend code.

   

Will be a plus:

• Experience with Elasticsearch: setting up and using it for full-text search.
• Strong SQL skills and hands-on experience with PostgreSQL. Knowledge of column-oriented databases and OLAP systems (e.g. DuckDB, ClickHouse) is highly valued.
• Experience working with cloud platforms (AWS, GCP, Azure) — especially with serverless architectures like Cloud Functions / AWS Lambda and cloud storage solutions (e.g. S3, Cloud Storage, Blob Storage).
• Experience with CI/CD and build automation in a Docker environment.

• Team development experience: code review, git flow, Jira/YouTrack/Linear.

   

Goals for the probationary period:

• Familiarize with the product architecture, internal processes and the stack used.
• Integrate the first HTTP/WebSocket endpoints into the backend by connecting third-party APIs.
• Participate in ongoing tasks to fix bugs and improve stability.
• Demonstrate strong time management skills and a sense of ownership — ability to take responsibility for tasks and deliver them on time.

• Gain hands-on experience with cloud infrastructure, particularly working with S3 (or similar object storage) and Cloud Functions / serverless environments.

   

What we offer

• A dynamic work environment with a passionate team focused on sports and technology.
• Paid sick leave (6 days) and 24 days of flexible vacation.
• Opportunities for professional growth and career development.
• Full remote work options and flexible working hours.

Founded in 2012, Playson is a leading iGaming supplier recognized worldwide. We provide our customers with a high-end micro-service-based platform as a service that aims to process billions of financial transactions per day. We provide a cross-regional setup and are chasing latency reduction down to zero. We highly invest in delivering the best game experience and smooth connection regardless of the internet coverage and bandwidth of the game clients.

Role Overview:

One of our teams is looking for a Tech Leader - Node.js to participate in developing our cutting-edge solution, where milliseconds matter. Our problem statement is not straightforward, as we aim to achieve high-end results in all important technical aspects of our business:

• best availability,
• lowest possible latency in all transaction processing operations and in every micro-service,
• the most efficient resource usage.

If you’re a product-passionate person, your mind is keen to solve deep tech engineering problems, and you have a fast "PoC first" approach with a deep sense of ownership, we would love to hear from you.

Why Join Us?

• Be a key player in a major tech transformation.
• Work on projects that impact millions globally.
• Enjoy a supportive, flexible work environment.
• Grow your skills with continuous professional development opportunities.

To succeed in the role, you will have:

• Degree in Computer Science or related field.
• Proficiency in Node.js/TypeScript.
• Knowledge of Kubernetes.
• 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.

Preferred additional qualifications:

• Experience with large-scale microservices architecture.
• Familiarity with cloud providers (AWS)
• Understanding of application security and industry best practices.

What will you be doing?

• Developing and maintaining backend applications for our gaming platforms.
• Optimizing existing systems for performance and scalability.
• Leading technical decisions and influencing our SaaS solutions.
• Collaborating with a distributed team to create new features.
• Conducting code and architectural reviews.
• Solving complex business problems with innovative solutions.
• Participating in on-call rotations within the squad to ensure the reliability and availability of our systems.

What you get in return:

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

The recruitment process includes the next steps:

1. HR Interview - 30 min

2. Meeting with Head of Platform 30-45 min

3.Technical interview with live coding 90 min

4. Final Interview with Solution Architect & CTO - 60 min

If the job description rings a bell - take action and apply!

Looking forward to welcoming you to the iGaming world!

Ambitious goals request a quick ability to maneuver through changes in the world. Playson is all about that.

Join us today! 🙌

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

About us:
Cowchain have successfully completed 120+ projects mainly on EVM-based blockchains such as Ethereum, Polygon, Arbitrum, Base including Coinmarketcap leaders with 180M+ total capitalization and 20M+ daily trading volume in Move2Earn, Play2Earn and DeFi industries.
 

Required skills:

— At least 1-year commercial experience in backend development
— Node.js & Nest.js — A MUST
— TypeScript
— PostgreSQL with Drizzle ORM
— Understanding of Onion Architecture
— Experience working with EVM networks and smart contracts
— Event indexing via The Graph / Subgraph
— REST & WebSocket APIs development
— GitFlow, Jira
— Experience with React, Next.js, Zustand
— SCSS, responsive UI
— axios for API calls
— Experience with blockchain data providers (Infura, Alchemy, QuickNode)

What will you do:
— New features development
— Bugfixes and support existing solutions
— Participate in project architecture discussions
— Build solutions from scratch as well as join on-going development process
— Have fun

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

We are looking for a passionate Back-End Developer to implement AI solutions aimed at achieving business goals (CLAi automates a multitude of business operations simple and complex alike. That includes
document reading, data entry, CRM management, calendar scheduling, and automated appointment booking.).

This role offers the opportunity to work on cutting-edge project and collaborate with a team of talented researchers and engineers in a stimulating and dynamic environment.

What you’ll do

• GraphQL APIs: Design schemas, resolvers, and gateways (Apollo Federation), enforce contracts, manage schema lifecycle (versioning, persisted queries), and mitigate N+1 with DataLoader.
• LLM integration: Orchestrate OpenAI and other providers (tool calling, guardrails, evals, cost controls), build prompt pipelines and caching.
• Email at scale (DKIM/SMTP/AWS SES):
  • Set up SES identities, DKIM signing, SPF/DMARC alignment.
  • Implement SMTP pipelines, retries, idempotency, and rate limiting.
  • Handle bounces/complaints via SNS → SQS, suppression lists, deliverability monitoring.
• Messaging & chat: Build reliable SMS flows (Twilio/Telnyx/SMPP), delivery tracking, and real-time chat (WebSockets/Event streams), search and threading.
• (Preferred) Voice automation: SIP/WebRTC basics, IVR/ASR/TTS; experience with FreeSWITCH/Asterisk is a plus.
• Horizontal scale & reliability: Stateless services on Kubernetes, partitioning, queues/streams (Kafka/RabbitMQ/NATS), back-pressure, circuit breaking, SLOs/on-call.
• Metrics & analytics: Instrument with OpenTelemetry; usage metering (e.g., OpenMeter); ship analytics dashboards (Metabase/Superset/ClickHouse/Timescale/Postgres).
  
   

Minimum qualifications

• 4+ years building production backends with Node.js + TypeScript.
• GraphQL expertise (NestJS/Apollo): schema design, federation, auth patterns, persisted queries/CDN caching.
• Hands-on LLM integration (OpenAI/Anthropic/Vertex, etc.).
• Email delivery with AWS SES + DKIM/SMTP and operational deliverability (SPF/DMARC, feedback loops).
• SMS integrations (Twilio/Telnyx/SMPP) and real-time systems (WebSockets/SSE/pub-sub).
• Strong RDBMS skills (PostgreSQL), plus Redis; testing (unit/integration), observability (logs/metrics/traces).
• Containers/Kubernetes, CI/CD, IaC basics.
  
   

Nice to have

• Voice/telephony: SIP/RTP/WebRTC, FreeSWITCH/Asterisk, ESL; STT/TTS/Whisper.
• Event-driven microservices, gRPC, and GraphQL Federation at scale.
• Analytics stack: ClickHouse/Timescale; embedded dashboards.
• Usage-based billing/metering, multi-tenant isolation, GDPR/PII handling.
• Vector search/RAG and embeddings.
  
   

Our stack (you don’t need all of it)

• Node.js, TypeScript, NestJS, GraphQL (Federation), REST (auxiliary), gRPC
• PostgreSQL/Timescale, Redis; ClickHouse
• Kafka/RabbitMQ/NATS
• Kubernetes (EKS), Terraform, Docker
• OpenTelemetry, Prometheus/Grafana, Loki
• OpenAI + other LLMs; Whisper/STT/TTS
• AWS SES (DKIM/SMTP), Twilio/Telnyx/SMPP, WebSockets
  
   

United Tech is a global IT product company shaping the future of real-time social connection. With millions of users across North America, Europe, LATAM, and MENA, we build next-gen mobile and web apps for live-streaming and social networking. Our platforms enable connection at scale fast, interactive, and deeply engaging. The market is projected to exceed $206B by 2030, and we are already leading the evolution. Founded in Ukraine, scaling worldwide

About your role: Join us in creating a next-generation global video chat platform. You will join at the start of product development, shaping its architecture and backend without the burden of legacy systems. This is your chance to influence key decisions, work on cutting-edge technologies, and create a cross-platform solution for web and mobile that will scale globally

In this role, you will

• Take part in team processes (grooming, sprint planning)
• Develop and deliver product tasks to the production environment
• Work on reducing and preventing technical debt
• Create technical designs for product epics
• Decompose epics into clear, executable tasks
• Conduct technical investigations and propose solutions

It’s all about you

• 4+ years of commercial experience in backend development
• 3+ years of experience with Node.js backend development
• Hands-on experience with relational and non-relational databases (MongoDB, Postgres, Redis)
• Strong background with SOA/Microservices (communication, development process)
• Solid understanding of patterns (DDD, event-driven, SOLID, CQRS)
• Experience working with WebSockets (ws, socket.io)
• Experience with messaging systems (BullMQ, RabbitMQ, Kafka)
• Cloud expertise (AWS, GCP, etc.)
• Proven track record in scaling and high-load products
• Upper-Intermediate English or higher

What we offer

Care and support: 

• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• Up to 10 additional days off for public holidays
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Team building events, corporate gifts, and stylish merch
• Financial and legal support
• Position retention and support for those who join the Armed Forces of Ukraine
• Participation in social initiatives supporting Ukraine
   

Comfortable working environment:

• Work from our Kyiv hub or remotely with a flexible schedule 
• Modern equipment or depreciation of your own tools
   

Investment in your future:

• Collaborate with a highly-skilled team of Middle & Senior professionals, sharing practical cases and expertise in the social networking niche
• 70% of our heads and leads have grown into their roles here – so can you!
• Performance-oriented reviews and Individual Development Plans (IDPs)
• Reimbursement for professional courses and English classes
• Corporate library, book club, and knowledge-sharing events
   

Hiring process

• Intro call
• Technical Interview
• Reference check
• Offer
   

We’re looking for a talented person to join our Development team. Your role will encompass back-end development via Nest.js (Node.js)

You will work closely with developers, designers, QA, and PM.

Read before applying:

• We are looking for an entry-level specialist.
• The first step will be a test task. After that, an interview.
• After hiring, we will assign a mentor, who will review every PR.

• We have a process (expertise) in how to grow you from junior to a strong middle-level.

   

About you

At least 1 year of professional experience in Nest.js (Node.js).

Experience in teams of 2-5 persons.

Understanding of the project development life-cycle.

Understanding of Agile / Scrum.

Hard Skills 

- TypeScript

- Node.js

- REST API

- Nest.js

- PostgreSQL

- MongoDB

- Understanding of principles of Functional Programming (FP) and Object-Oriented Programming (OOP)

- Dependency Injection (DI)

- Difference between SQL and NoSQL

- Writing clean, scalable code

following SOLID

- Experience with CI/CD

- Basic understanding of web security principles (OAuth, JWT, CORS)
 

What we offer 

1. 22 days off and 12 sick days paid by the company annually.
2. Paid national holidays.
3. Health insurance.
4. English classes.
5. GYM.
6. Team building twice per year.
7. Welcome box.
8. Paid overtime.

To avoid spam, please write on top "Ready to complete a test task." I'll share a link to the test task.

Thank you and good luck!

CEO Anatolii

We are looking for a highly skilled Middle Node.js Developer to join our dynamic team! If you’re up for a challenge and enjoy working in a collaborative environment, we’d love to hear from you 🚀

Requirements:
— Experience with:
• JavaScript, Typescript;
• Node.js, Express or Nest.js;
• REST API;
• MySQL or PostgreSQL;
• TypeORM or Sequelize;
• Docker;

• GCP;
• Basics of Linux;
— Understanding of basic principles of LLM models, AI Agents, RAG Architecture Model;
— General knowledge of LangGraph/LangChain frameworks;
— Confident written and spoken English (B2 level or above);
— Effective communication and collaboration skills;
— Critical thinking and accountability;
— Excellent time management skills and ability to adapt to a fast-paced work environment;
— Bachelor’s or Master’s degree in a technical field.

Would be a plus:
— Experience with:
• RabbitMQ;
• MongoDB;
• Websocket, SocketIO;
• AWS, Azure;
• Test frameworks;
— Experience with LangGraph/LangChain frameworks;
— Developing agent workflows and applications powered by large language models (LLMs);
— Strong understanding and hands-on experience with front-end technologies and architecture;
— Ability to find creative solutions to complex architectural or coding issues.

We offer:
• Transparent financial motivation;
• Remote workplace or a comfortable office in the center of Kyiv;
• 18 working days of paid leave annually;
• Unlimited sick days;
• Salary review twice a year;
• Compensation for our English-speaking club — 100%;
• Compensation for any AI tool of your choice — 100%;
• Compensation for coworking spaces — 100%;
• Compensation for gym memberships and professional courses — 50% (after the trial period);
• Compensation for any English courses — 50% (after the trial period);
• Compensation for sessions with a psychologist — 50% (after the trial period);
• Medical insurance (after the trial period).

Interview Stages:
Screening Interview ➡️ Technical Interview ➡️ Job Offer

If you have the skills, passion, and determination we’re looking for, apply now to become part of our exciting journey ⭐️

Who are we looking for?

We are looking for an "independent fighting unit" who is ready to join our Team and start working together on our projects immediately or after training.

Tasks?

Your tasks will focus on the skills and expectations listed below and the use of new approaches and technologies.

Why did the job open?

We want to invite a new specialist to the company's staff due to the increase in the number of projects and the opening of a branch.

Requirements:

- B1 English (Upper-Intermediate)+

- At least 2+ year of commercial experience with JavaScript

- At least 2+ years of commercial experience with Node.js

- Experience with Typescript, Nest.js

- Experience with RDBMS and NoSQL databases

- Experience with implementing automated testing platforms and unit tests

- Experience with REST/GraphQL

- Experience with cloud services such as AWS, GCP or Azure

- Experience with CI/CD processes

- Experience in integrating with external APIs

- SOLID understanding of object-oriented programming

- Flexibility and ability to adapt to changes

- Ability to work closely with Product Managers and Engineering Team-members

Good to have:

- Experience with Unit/E2E testing

- Understanding design, and architecture principles

- Experience with message brokers, like RabbitMQ, SQS, etc

- Experience with JS web-frameworks React/Vue/Angular etc

At FluidLabs, we are launching a new direction in collaboration with DocuSign — one of the world’s leading players in digital signatures and contract management.
This is a rare opportunity to join a large-scale project and become a top-tier expert across the entire DocuSign product ecosystem, building unique expertise with true global value.


Key responsibilities:

• Design, develop, and maintain back-end services using Node.js and TypeScript
• Build and optimize serverless applications on AWS Lambda
• Work with DynamoDB (data modeling, performance tuning, query optimization)
• Set up monitoring, logging, and alerting via AWS CloudWatch
• Implement and maintain secure authentication/authorization flows with OAuth2/OIDC
• Collaborate with front-end engineers, architects, and product managers to deliver scalable solutions
• Write clean, maintainable, and well-tested code (TDD when possible)
• Participate in code reviews, provide feedback, and ensure high code quality
• Contribute to technical discussions, propose solutions, and share knowledge with the team

• Troubleshoot production issues, optimize performance, and ensure system reliability

   

Must-have technical skills:

• Strong proficiency in TypeScript
• Hands-on experience with Node.js (building and maintaining production-grade applications)
• Proven experience with AWS Lambda (serverless architecture)
• Practical knowledge of AWS DynamoDB (NoSQL data modeling, queries, performance tuning)
• Experience with AWS CloudWatch (monitoring, logging, metrics, alerts)

• Solid understanding and implementation of OAuth2 / OIDC (authentication & authorization flows)

   

Nice to have:

• Experience working with DocuSign products and building integrations on top of them
• Hands-on experience with event-driven architectures (SQS, SNS, Kinesis, RabbitMQ, WebSockets)
• Familiarity with broader AWS ecosystem (API Gateway, S3, Step Functions, IAM policies)
• Solid grasp of CI/CD workflows (GitLab CI, GitHub Actions, or similar)
• Knowledge of software design principles (SOLID, DDD, TDD)

• Some exposure to frontend frameworks (React, Next.js) for seamless integration

   

What we offer:

• Long-term collaboration on meaningful projects
• A passionate team with a healthy, positive culture
• Enterprise-level projects with real technical challenges
• Room to grow — both professionally and personally
• Partial tax compensation
• Referral bonuses for successful candidate recommendations
• Paid holidays and time off
   

Work terms:

• Working hours: 11:00–20:00 (Kyiv time)
• Vacation: 24 paid days per year
• Trial period: 3 months
  
   

We are seeking a Senior Backend Developer for one of our project, who based in Europe.

This opportunity is ideal for proactive technologists who thrive in fast-paced startup environments and want to make a major impact on the future of digital trade.

Responsibilities

• Collaborate with a culturally diverse global software development team to drive the delivery of world-class web applications.
• Influence technical direction, system design, and standards, and mentor team members for technical excellence.
• Design and implement scalable and robust backend services and APIs with usability and clarity in focus.
• Work hands-on with advanced technologies: encryption, digital signatures, blockchain, PDF processing, message queues, and asynchronous background tasks.

Requirements

Core Skills

• 3+ years with JavaScript and TypeScript.
• 3+ years experience building modern SaaS or B2B apps using NestJS, TypeORM, and various software architectures.
• 3+ years designing REST APIs and implementing authentication methods.
• 3+ years working with database systems, SQL, and performing code reviews.
• 1+ year of blockchain development or maintenance is a strong plus.

Infrastructure

• Experience with AWS SDK v3, RDS, S3, SQS, SES, Redis/ElastiCache, Cognito, DynamoDB.
• 3+ years working with Docker (Kubernetes is a plus).

Frontend (Nice to have)

• 1+ years with NextJS, ReactJS, Redux/RTK, and SCSS.

Process

• 3+ years in Agile/Scrum environments, working with functional/non-functional requirements and specifications.
• 3+ years using Jest for code quality and automated testing.
• Strong analytical skills to detect and remediate bugs.
• 5+ years of version control experience (Git) and code review.

Soft Skills

• Excellent communication, ownership, and commitment to code quality and business timelines.
• Results-driven, independent, and entrepreneurial mindset.

This is a full-time remote position for candidates based in Europe (excluding Ukraine).

Our UK-based customer is building a new multi-tenant platform for asset management – a complex, interconnected system designed to unify disparate data sources and ontologies into a single, collaborative environment.
The platform requires advanced interoperability between different domains, offline-first functionality with data synchronization, and scalable architecture to support multiple clients and access levels.

This is a long-term project (6–12 months minimum), where you will have the opportunity to shape architecture, solve challenging data problems, and work alongside a highly collaborative team in an agile environment.

Responsibilities

• Design and develop core system components, including:
  • multi-tenant data management and synchronization,
  • interoperability across heterogeneous systems,
  • rule evaluation and advanced data processing.
• Contribute to architectural decisions and implementation of shared libraries.
• Implement offline-first capabilities and data sync mechanisms.
• Collaborate with product owners, architects, and other developers in an agile setup (daily standups, task boards, CI/CD).
• Ensure scalability, reliability, and maintainability of the system.

• Stay adaptable and contribute across the stack as needed.

   

Required Skills & Experience

Core skills and knowledge: 

• TypeScript
• AWS Lambda, EC2
• Computer Science & Advanced Knowledge:
• Strong foundations in algorithms and data structures.
• Set Theory & Categorization Theory – frameworks for organizing and classifying data.
• Formal methods – use of mathematical models and logic in software verification.
• Exposure to meta programming, compiler theory, abstract syntax trees/graphs, semantic graphs, knowledge graphs.
• Basic understanding of ML concepts (e.g., loss functions, optimization).

To know or strong desire and ability to learn: 

• Gherkin (optional)
• AWS Neptune (optional)

• Gremlin (optional)

   

Communication

• English proficiency: B2+ (comfortable in technical discussions, daily standups, and documentation).

   

Nice to Have

• Experience with graph databases or ontology-driven systems.
• Building Progressive Web Applications (PWA).
• Hands-on knowledge of large-scale, multi-tenant architectures.

What We Offer

• A chance to work on an innovative project from the ground up.
• Remote-first, flexible work environment.
• Initial contract of 6+ months, with potential extension.
• Collaborative, international team culture.