Jobs

About the Role
 

We’re building an in-house batch payout and reconciliation platform for ERC-20 and TRC-20 tokens. You’ll own the end-to-end architecture - from hot-wallet key management and bulk on-chain transfers to monthly SLA reporting - supporting up to 10,000 concurrent transactions.

Key Responsibilities:

- Architect and build a high-throughput batch payout engine in Node.js, handling ERC-20 & TRC-20 token transfers

- Integrate with self-custodied hot wallets; securely manage private keys (AWS KMS, HashiCorp Vault, HSM, etc.)

- Implement nonce management, gas optimization (EIP-1559), and on-chain batch-transfer contracts

- Develop reconciliation logic using both on-chain data and off-chain data from CEXs/DEXs and Oracles

- Design retry strategies, error handling, and idempotent workflows for failed or reverted transactions

- Monitor system health, log all activities, and produce monthly SLA reports, tracking success rates, confirmation times, and uptime

Required Qualifications:

- 5+ years professional Node.js experience

- Deep familiarity with blockchain protocols - ERC-20 & TRC-20 standards, gas/bandwidth/resource models

- Hands-on experience with web3.js, ethers.js, tronweb, and CCXT

- Proven track record designing high-throughput systems with precise nonce and concurrency control

- Solid understanding of cryptographic key management best practices (hot wallets, KMS/Vault, HSM, multi-sig)

- Ability to troubleshoot complex blockchain issues - gas volatility, reorgs, token approvals, API rate limits, TRON resource constraints.

Mindset & Communication:

- Ownership mentality: you balance urgent deliverables with long-term architectural vision

- Organized and reliable: you prioritize critical tasks without sacrificing code quality

- Research-oriented approach: you evaluate tools and patterns, but focus on what works in practice

Nice-to-Have

- Experience writing or integrating batch-transfer smart contracts in a Node.js environment (e.g. OpenZeppelin MultiSend)

- Knowledge of The Graph subgraphs for DEX data analytics

- Prior work in crypto exchange integrations or fintech reconciliation systems

What is the purpose of this position?
We are looking for an experienced developer (4+ years of commercial experience) to strengthen our team. Currently, potential clients make many requests, so we want to engage a new specialist on board and provide fast staffing. As far as we use different sources for clients attraction, on some projects may be used time-tracking. Please pay attention to this. 

Qualifications you`ll need to bring:
— 3+ years of commercial experience with Node.js is a must
— Experience and understanding of core concepts of JavaScript
— ​​2+ years of hands-on experience with TypeScript
— Excellent knowledge of the development of scalable and highly available RESTful APIs using Node.js
— Understanding of Single Sign-on and token-based authentication, REST, JWT, OAuth
— The ability to use version control systems, in particular — Git
— ​​Familiarity with modern and upcoming standards
— Intermediate+ English level at least
— Ability to work self-managing and autonomously

It will be a plus
— Practical experience with complex mongoose aggregations
— Basic knowledge of three-layer architecture (transport layer, business logic layer, data layer)
— Basic knowledge of patterns (GoF band, SOLID, GRASP)
— Experience with unit and Integration testing with Mocha, Chai, Jest
— Experience in a frontend development using React

In this role, you will be in charge of:
— Developing the back-end part of a project
— Writing unit/integration tests
— Set up task runners and build tools
— Collaboration with a cross-functional team 

We offer:
— Remote Work Environment. Work from anywhere and be part of a geographically diverse team
— Stay Ahead of the Curve. Work with cutting-edge technologies
— Possibility of payment by PE account, Payoneer, or Wise
— Bonus & Referral system
— Paid 16 vacations and 14 sick leaves per year (after transferring to full-time cooperation)
— Flexible hours
— Compensation program for purchasing new laptops
— Paid professional certifications & educational courses
— Paid English classes
— Friendly atmosphere with quarterly team building
— No bureaucracy

Ready to try your hand? Do not pull the cat’s tail and send your CV without a doubt!

For those candidates who don’t get any feedback after applying: We are so thankful for your time and attention to our vacancy! However, sometimes we get more than 100 CVs at once, and it would take several days to answer them all. That’s why we reach out only to relevant candidates. We hope for your understanding.

We search for a «willing to learn» person who wants to learn and develop enterprise-level web applications/websites.

Skills & Requirements:

• You’ve got at least 1 year of experience in JavaScript

• You’ve worked with some of the modern JavaScript frameworks — Vue.js

• You have experience with Node.js

• You have experience with NoSQL databases (ideally MongoDB)

• You feel comfortable communicating in English

• You’re passionate about solving new problems

• You are always looking for the best solution

We are offering:

-Senior team;

-Regular review;

-Long-term employment;

-Challenging projects;

-Certifications;

Responsibilities:

-Code review.

-Functionality improvements to an existing solution

-Increasing system stability, testability, maintainability, and security

What we're looking for

We’re looking for a Senior Software Engineer who is passionate about clear communication, high-quality documentation, and building modern, scalable systems using TypeScript and Azure.

You’ll work on solutions that integrate with IoT devices and healthcare systems—creating secure, cloud-based infrastructure to collect, process, and act on real-world data. As one of the earliest members of the engineering team, you’ll help shape our technical strategy and lay the foundation for sustainable, long-term scale.

You are expected to proactively use AI-assisted tools (like Cursor, ChatGPT, and others) to support your work in coding, documentation, testing, debugging, and technical research.

Requirements: 

• 6+ years of development experience in general 
• Strong proficiency in TypeScript. Experience with other languages is a plus.
• Solid experience building and consuming REST APIs and working with JSON/XML data formats.
• Hands-on experience with Azure, especially deploying and maintaining App Services.
• Familiarity with Agile development and DevOps practices.
• Strong problem-solving and debugging skills.
• Excellent communication skills in English, both written and verbal.

What you'll do

1. Communicate clearly and document proactively — from architecture decisions and design proposals to clean, readable code. You help raise the communication bar across the team.
2. Design, build, and maintain scalable services and applications using TypeScript (Node.js, Azure Functions) in Azurebased environments.
3. Use AI tools to accelerate and enhance your development workflow, from concept to production.
4. Develop and support cloud-native solutions using Azure services such as App Services, Functions, Blob Storage, and Azure DevOps Pipelines.
5. Build and consume APIs and integrations using REST, JSON, XML, and other common formats.
6. Implement and improve CI/CD pipelines and automate DevOps workflows for efficient, reliable deployments.
7. Collaborate cross-functionally with product and implementation managers, Salesforce developers, and QA to deliver high-impact, end-to-end solutions.
8. Monitor, troubleshoot, and optimize production systems for performance and reliability.
9. Contribute ideas and feedback that improve the product, system architecture, and engineering practices.

What could be an advantage

• Experience with data engineering — we move and transform a large volume of data.
• Knowledge of event-driven architectures — core to our infrastructure design.
• Experience designing high-availability, fault-tolerant systems, especially in health tech or fintech contexts.

• Experience with health care specific data models like FHIR and ECD/EPDs.

   

Remote full-time position. Freelance contract.

Job Summary
 

As a Senior Back-end Engineer, you’ll lead the development of secure, high-throughput payment solutions that bridge blockchain and fiat ecosystems for our cutting-edge Skin Gambling and Casino Platform. Your expertise will directly enable seamless cross-chain operations and drive the future of digital financial services in a collaborative, globally distributed environment.
 

Required Qualifications

• 5+ years of professional back-end development experience with Node.js and TypeScript in production environments.
• Proven expertise in integrating crypto payment gateways and fiat processors.
• Hands-on experience with integration of RPC Node Providers (e.g., Infura, Alchemy) for cross-chain operations (ERC-20/BEP-20/TRC-20 tokens).
• Proficiency in PostgreSQL, including schema design, optimization, and ORM tools (Drizzle or equivalent).
• Strong knowledge of distributed systems using Redis, message brokers (NATS/Kafka), and real-time protocols (WebSockets).
• Experience deploying microservices via Kubernetes, Docker, and CI/CD pipelines (GitLab/GitHub Actions).
• Familiarity with monorepo management tools (e.g., Turborepo, Nx).
• Fluency in Ukrainian or Russian and proficiency in English for technical collaboration in a remote/global team setting.
• Ability to work within the CET/EET time zone.

Your Advantage

• Prior integration experience with ZEN.com’s payment ecosystem.
• Experience with Skin/NFT Gambling or Online Casinos.
• Exposure to front-end technologies like React, Next.js, and state management (MobX/Redux).
• Previous experience working in a start-up environment with rapid iteration cycles.
   

Key Responsibilities

• Design, develop, and maintain scalable back-end services for crypto and fiat payment processing using Node.js, TypeScript, and PostgreSQL.
• Integrate and optimize payment gateways for cryptocurrencies (ERC-20/BEP-20/TRC-20) and traditional fiat systems, ensuring secure and low-latency transactions.
• Implement cross-chain payment solutions by interfacing with RPC Node Providers for deposits, withdrawals, and balance synchronization.
• Architect event-driven systems leveraging NATS, Redis, and WebSockets for real-time transaction monitoring and notifications.
• Optimize database performance and integrity using Drizzle ORM, including complex querying and indexing strategies.
• Collaborate with front-end teams to define APIs and ensure seamless integration with React/Next.js applications (full-stack exposure).
• Establish CI/CD pipelines via GitLab and Turborepo, deploying containerized services (Docker) on Kubernetes clusters.
• Conduct code reviews, troubleshoot production issues, and implement observability tools for system health monitoring.
• Drive security best practices for payment handling, including encryption, audit trails, and compliance checks.

We are looking for a Middle Backend Developer to join the technical team of a fast-growing SaaS business focused on document processing and conversion. In this role, you will play a key part in the development and scaling of a flagship web product used by millions worldwide.

Location: remote

What You’ll Do:

• Design and implement new functional modules and integrations to expand the product’s capabilities.
• Ensure high code quality and standardization of development approaches.
• Speed up development and release cycles of new product versions.
• Define and develop product architecture, including technology choices, project structure, and scalable infrastructure to support a large user base.

The team has already achieved impressive results:

• Over 4 million users every month.
• More than 50 tools for efficient document management.
• Users from over 30 countries rely on the product.

Tech Stack: TypeScript, Node.js, Nest.js, PostgreSQL/MySQL, Redis, React, Redux, Next.js, SQS.

Responsibilities:

• Development and maintenance of both frontend and backend applications using Nest.js, React, Next.js, Node.js.
• API integration between frontend and backend, query optimization, working with HTTP, gRPC, SSE, GraphQL.
• Database work (PostgreSQL (RDS), Redis): schema design, query writing, performance optimization.
• Development and maintenance of microservices architecture; containerization with Docker.
• Managing technical debt and refactoring code.
• Code reviews and ensuring high code quality through unit and e2e testing (Jest, Playwright).
• CI/CD and DevOps processes with GitHub Actions.
• Writing clean, maintainable, and well-documented code.

Requirements:

• 2+ year of commercial experience with Node.js, Nest.js, TypeScript
• Basic knowledge of React, Next.js.
• Side projects, participation in hackathons, coding competitions, or other technical activities are a big plus.

The company offers:

• Learning & development: internal training sessions and expert-led workshops with specialists from Ukraine and abroad.
• Career growth: a culture of fast career development; many team leads and managers have grown internally.
• One of the best benefits packages: competitive compensation, 20 paid vacation days, paid sick leave, medical insurance.
• Well-being program: mental health support (therapy compensation), yoga and meditation classes in the office.
• Support during the war: stability and safety for you and your family, uninterrupted work environment, and participation in initiatives to rebuild Ukraine.

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:

• Proficiency in Node.js, with a strong understanding of core principles, performance optimization, testing, pipelines, deploying, monitoring, scaling, etc.
• Experience with PostgreSQL, particularly in performance optimization.
• Ability to configure and manage message brokers such as RabbitMQ.
• Familiarity with caching mechanisms like Redis.
• Competence in writing and maintaining unit, integration, and E2E tests.
• Solid understanding of software architecture design, including UML and design patterns.
• Knowledge of RestAPI and OpenAPI specifications.
• Experience with Git flow for version control.
• Working experience 
   At least 5+ years of hands-on experience with Node.js.
• Minimum 3 years of experience working with relational databases (PostgreSQL).
• At least 3 years of experience in test implementation (unit, integration, E2E).
• Demonstrated experience in developing new features and enhancing existing services.
• Experience in handling complex problems and providing effective solutions.
• Consistent improvement of code organization and application design.
• Management skills (if needed) 
• Potential for team leadership and management responsibilities.
• Ability to mentor and guide team members.
• Strong organizational skills and the ability to manage multiple tasks effectively.
• Experience or aptitude in making architectural decisions and leading development initiatives.
• Domain experience / Preferable companies (FinTech, E-commerce, gambling etc.) 
      

  Experience in FinTech, E-commerce, or gambling sectors is preferred.

  Proven experience in performance tuning and handling high-load systems.

  Background in working with microservices architecture and optimizing their performance.

Additional requirements (foreign language) 
    

  Strong command of English, particularly for reading and writing technical documentation (Upper-Intermediate level).

  Ability to maintain emotional well-being and manage stress effectively.

  Proactive approach to learning and staying updated with the latest technologies and best practices.

  Capability to create and maintain clear and concise documentation in English.

•    Express.js
•    Nest.js (good to have)
•    Typescript  
•    Unit/Integration/E2E testing
•    Jest
•    CucumberJS
•    RabbitMQ
•    Redis
•    Software Architecture Design/UML/Design Patterns
•    PlantUML (good to have)
•    RestAPI
•    OpenAPI Spec
•    Postgresql
•    Sequelize
•    Prisma (good to have)
•    Kubernetes
•    Understanding Go code (would be a plus)
•    Solid understanding OOP/Solid/Quality Gates 

Responsibilities:

•  Development of new features and system implementations: Creating new functionalities, integrating new systems, and ensuring compliance with product requirements.
• Refactoring existing code: Optimizing and improving existing code according to established guidelines, ensuring system stability and performance.
• Optimizing PostgreSQL performance: Configuring, optimizing, and monitoring the PostgreSQL database to ensure high performance and reliability.
• Setting up and configuring message brokers: Working with RabbitMQ to ensure efficient message processing, resolving issues with queues and retries.
• Testing and quality assurance: Writing and maintaining integration, unit, and E2E tests, ensuring high test coverage, controlling code quality, and participating in CI/CD processes. 

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.

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:

• Proficiency in Node.js, with a strong understanding of core principles, performance optimization, testing, pipelines, deploying, monitoring, scaling, etc.
• Experience with PostgreSQL, particularly in performance optimization.
• Ability to configure and manage message brokers such as RabbitMQ.
• Familiarity with caching mechanisms like Redis.
• Competence in writing and maintaining unit, integration, and E2E tests.
• Solid understanding of software architecture design, including UML and design patterns.
• Knowledge of RestAPI and OpenAPI specifications.
• Experience with Git flow for version control.
• Working experience 
   At least 5+ years of hands-on experience with Node.js.
• Minimum 3 years of experience working with relational databases (PostgreSQL).
• At least 3 years of experience in test implementation (unit, integration, E2E).
• Demonstrated experience in developing new features and enhancing existing services.
• Experience in handling complex problems and providing effective solutions.
• Consistent improvement of code organization and application design.
• Management skills (if needed) 
• Potential for team leadership and management responsibilities.
• Ability to mentor and guide team members.
• Strong organizational skills and the ability to manage multiple tasks effectively.
• Experience or aptitude in making architectural decisions and leading development initiatives.
• Domain experience / Preferable companies (FinTech, E-commerce, gambling etc.) 
      

  Experience in FinTech, E-commerce, or gambling sectors is preferred.

  Proven experience in performance tuning and handling high-load systems.

  Background in working with microservices architecture and optimizing their performance.

Additional requirements (foreign language) 
    

  Strong command of English, particularly for reading and writing technical documentation (Upper-Intermediate level).

  Ability to maintain emotional well-being and manage stress effectively.

  Proactive approach to learning and staying updated with the latest technologies and best practices.

  Capability to create and maintain clear and concise documentation in English.

•    Express.js
•    Nest.js (good to have)
•    Typescript  
•    Unit/Integration/E2E testing
•    Jest
•    CucumberJS
•    RabbitMQ
•    Redis
•    Software Architecture Design/UML/Design Patterns
•    PlantUML (good to have)
•    RestAPI
•    OpenAPI Spec
•    Postgresql
•    Sequelize
•    Prisma (good to have)
•    Kubernetes
•    Understanding Go code (would be a plus)
•    Solid understanding OOP/Solid/Quality Gates 

Responsibilities:

•  Development of new features and system implementations: Creating new functionalities, integrating new systems, and ensuring compliance with product requirements.
• Refactoring existing code: Optimizing and improving existing code according to established guidelines, ensuring system stability and performance.
• Optimizing PostgreSQL performance: Configuring, optimizing, and monitoring the PostgreSQL database to ensure high performance and reliability.
• Setting up and configuring message brokers: Working with RabbitMQ to ensure efficient message processing, resolving issues with queues and retries.
• Testing and quality assurance: Writing and maintaining integration, unit, and E2E tests, ensuring high test coverage, controlling code quality, and participating in CI/CD processes. 

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.

 We’re looking for a Backend Developer with team leadership experience who can take ownership of server-side systems, data flows, and API architecture, while coordinating and guiding a team of engineers. You will contribute directly to the codebase and also drive technical structure and quality.
 You'll play a key role in turning complexity into clarity - coordinating with non-technical and technical teams to ensure shared understanding and consistent execution.
 Clear communication, system thinking, and process-oriented work are essential.  

Responsibilities

-Lead a team of developers: provide technical guidance, review implementation, and support growth.

-Design and implement backend services, APIs, and asynchronous processing logic.

-Collaborate with product and engineering peers to turn specifications into maintainable systems.

-Integrate external and internal APIs.

-Build reliable processing logic: scheduling, retries, error handling, monitoring.

-Coordinate planning, task breakdown, estimation, and prioritization processes.

-Ensure code quality through standards, reviews, and well-defined development workflows.

Requirements

-5+ years of experience in full-stack software development.

-Proficient in Node.js and TypeScript.
-Advanced SQL knowledge.
-Strong understanding of asynchronous programming and task queue management (e.g., BullMQ, RabbitMQ).
-Experience leading or mentoring engineers on delivery, structure, and quality.
-Comfortable using structured approaches to planning and managing work (Agile, OKR, issue tracking).
-English proficiency for written specs, documentation, and video calls.

Work Approach

-Structured, delivery-focused thinking: prioritizes clarity, traceability, and maintainability.

-Supports other developers in solving complex problems, improving their workflow, and growing professionally.

-Balances quick implementation with architectural clarity and forward-thinking decisions.

-Aligns development goals with broader product and operational objectives.

-Brings consistency and clarity into planning, reviews, and progress tracking.

-Works closely with non-technical team members to ensure that engineering efforts align with real-world needs and constraints.  

Bonus Points

-Previous work in early-stage companies or rapidly evolving environments.

-Familiarity with Docker, CI/CD pipelines, and deployment automation.

-Participation in technical planning, including writing proposals, RFCs, or implementation outlines.
 

Appexoft is looking for a motivated Trainee or Junior Node.js Developer to join our team in Lviv (office format). We would love to hear from you if you are eager to grow in backend development and work with modern technologies.
 

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

Про компанію Appexoft

Appexoft is Software Development Company that provides a full range of top-quality IT services. Our mission is to develop first-class applications and Websites to provide our clients with the best solutions for maximizing their profits and converting their ideas into reality.

Skills

• Commercial experience in software development projects
• Working experience with Next.js, Node.js, React, PostgreSQL, Tailwind, Prisma
• Strong knowledge of JavaScript
• Hard-working, smart, proactive, goal oriented, open in communication, not afraid to voice your own opinion
• Willing to take part in business and design decisions and analysis
• Experience with Python - preferable
   

Do not hesitate to apply if you are missing specific experience.

We Offer

• WFH and flexible working hours

Requirements

• Develop new products and develop existing ones of Valid-X company.

• Proactively take part in design and marketing discussions, take responsibility for products from the technology side.

   

Project description

• Social wiki platform website (similar to Wikipedia and Fandom)
• Tech stack: Next.js, Node.js, PostgreSQL, Prisma, Vercel

• Other projects

   

Про компанію Valid-XWe are a growing company with interesting projects, a fun work environment, great perks and flexibility. Valid-X is known for its transparent approach to software development. Check out our job openings and send us your CV.

The software development company and digital solutions provider. The company has created over 65 cutting-edge products spanning 20 different markets.
Our team of around 1 200 tech-savvy professionals successfully deliver scalable projects that are custom-made to the customers’ needs.
We also strive to create a culture centered around personal and professional growth for employees, in a positive and welcoming environment.

We are looking for a skilled Senior Node.js Developer

✅ Requirements:
✔️Strong knowledge of JavaScript and the ECMAScript 6 standards
✔️3+ years of commercial experience with Node.js
✔️5+ years of commercial experience in web development
✔️Commercial experience working with high-loaded SQL or NO SQL databases
✔️Commercial experience in implementing the REST, GraphQL, and WebSockets
✔️Understanding of the TDD principles and experience in writing tests
✔️Understanding of microservice architecture principles
✔️Experience with GIT version control system
✔️Experience with RabbitMQ
✔️Experience with Redis
✔️Experience with databases MongoDB, MySQL
✔️At least an Intermediate lvl of English

✅ Will be a plus:
✔️2+ years of hands-on experience developing CI/CD/Micro Services architecture/Containers
✔️Experience with Kubernetes,
✔️Experience with Nats
✔️Experience with TypeScript

✅ Duties and opportunities:
✔️In-house platform development
✔️3rd party API integrations
✔️Actively participate in developing new features from scratch
 

✅ We offer excellent benefits, including but not limited to:
✔️Working with the latest technologies (Nest, Kubernetes, mongo, graphQL, MySQL, etc)
🧑🏻‍💻Learning and development opportunities and interesting challenging tasks;
🏋️‍♂️ Company fitness corner in the office for employees;
📚 Opportunity to develop language skills and partial compensation for the cost of language classes;
🎁 Birthday celebration present;
🏝 Time for proper rest and 24 working days of Annual Vacation;
🍲 Breakfasts and lunches in the office (partially paid by the company).

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:
— 1+ year of commercial experience specifically in Web3/blockchain development
— 2+ years of experience in back-end development overall
— Node.js, Nest.js
— MSSQL, MySQL, PostgreSQL
— RabbitMQ, Redis Cache, BullMQ
— JIRA, Gitflow
— Hands-on experience with EVM-based blockchains (Ethereum, Polygon, BSC, etc.)
— Solid understanding of EVM architecture and smart contracts (Solidity)
 
Tech stack:
— Node.js, Express, Nest.js, Microservices, Reddis, RabbitMQ;
— MYSQL, MSSQL, PostgreSQL;
— TheGraph (Subgraph), Moralis, Alchemy, Infura, Event indexing back-end;
— Azure, AWS, Google Cloud;
— Docker, Kubernetes.

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)

Will be a huge plus:
— Web3/Ethers libraries;
— React development experience;
— Experience with DEX/CEX integration (Uniswap, PancakeSwap, Binance API);
— Solidity / Hardhat / Foundry.

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.
 

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.

We are a rapidly growing startup building an advanced management and analytics platform for companies operating on fan platforms such as OnlyFans, Fansly, and others.

Our platform helps businesses efficiently manage large numbers of accounts and teams, offering powerful tools for operational optimization and revenue growth.

At the core of our system are powerful automation workflows, advanced data collection, and actionable insights that help our users optimize their operations.
 

The Role

We’re looking for an experienced backend engineer to take a leading role in this project. You’ll be responsible for designing system architecture, hands-on coding, and driving technical decisions.

What You’ll Do:

• Lead the development of the statistics subsystem, focusing on analytics and reporting.
• Design and implement microservices to automate key processes for our users.
• Build and maintain high-performance databases like ClickHouse, TimescaleDB and other specialized tools to handle large-scale data and optimize analytics flow.
• Work with large volumes of events and data streams, ensuring optimal performance and reliability.
• Collaborate with cross-functional teams to ensure seamless integration of automation and statistics features.
• Continuously optimize existing systems for performance, scalability, and reliability.

Your Expertise:

• Strong experience with Node.js, focused on backend development and building scalable, high-load systems.
• Experience with high-load databases such as ClickHouse, TimescaleDB, DynamoDB, Spark, and Cassandra, to handle and process large volumes of data efficiently.
• Expertise in real-time data processing, with a focus on streaming analytics and optimizing performance.
• Experience designing and implementing microservices, ensuring high availability, fault tolerance, and scalability.
• Strong knowledge of performance optimization for low-latency systems that can handle large-scale data processing.
• Solid understanding of cloud platforms (AWS, GCP, etc.) and containerization technologies (Docker, Kubernetes) for scalable deployments.
• Excellent problem-solving skills, with the ability to design efficient solutions for high-traffic data processing.
• Familiarity with event busses and message queues (e.g., Kafka, RabbitMQ, SQS) for real-time data processing.