Jobs

Become part of United Tech as an experienced Node.js Backend Developer, contributing to high-performance, scalable products using modern technologies

About the team: join our Backend team, where collaboration and growth are at the heart of everything we do. We are a close-knit group of developers, Product Managers, DevOps, and QA specialists, all dedicated to helping our products thrive. With mentorship from seasoned experts and a strong sense of ownership, everyone here has a voice and can make a real impact.

Working in the social networking niche, we embrace challenges and celebrate progress. This is a dynamic field where you will stay on top of trends, tackle high-load systems, and dive into complex problems. The market is still growing, and there’s plenty of opportunity to carve out your own path and make a difference!
 

Know someone perfect for this role? Recommend a candidate and receive a bonus up to $1500
 

In this role, you will:
 

• Participate in team processes (grooming, sprint planning)
• Develop and deliver product tasks to the production environment
• Handle technical debt tasks
• Create technical designs for product epics
• Decompose epics into actionable tasks
• Investigate and resolve complex issues

It’s all about you:
 

• 4+ years of commercial backend development experience
• 3+ years of Node.js backend experience
• Proficiency with relational and non-relational databases (Postgres, MongoDB, Redis)
• Experience with SOA/Microservices architecture (communication, patterns, development process)
• Knowledge of WebSockets and messaging systems (RabbitMQ, Kafka)
• AWS experience (S3, Aurora, Cloudfront)
• Experience with scaling and high-load systems
• Strong Computer Science fundamentals
• Intermediate English level or higher

What we offer
 

• Care and support: 
• 20 paid vacation days, 15 sick days, and 6 additional days off for family events
• 100% medical insurance coverage
• Sports and equipment reimbursement
• Online yoga class with an instructor from the Ukrainian Yoga Federation
• 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
• Tech Interview
• Final Interview 
• Reference check
• Offer
   

What We Expect

• Excellent knowledge of JavaScript and TypeScript, with experience writing tests (preferably Jest)
• Strong understanding of SQL and the HTTP protocol
• Understanding of data structures and experience writing algorithms

Interview Stages

1. Complete a technical task (building a web service) independently within 1-2 days.
2. Technical screening interview (45-60 minutes).
3. Live coding session (2 hours) - candidate can use Google but not Chat GPT or similar tools.

Interview Topics

1. JavaScript ES6

2. Typescript 

3. Promises

4. SQL

5. Data structures

6. REST APIs / HTTP protocol

7. Docker

8. nest.js 

9. DevOps / Cloud compute / CI/CD

About the Position

• Compensation: a flat monthly rate or hourly (tracked via Toggl.com)
• Holidays, sick days and vacation: standard for Ukraine (21 vacation days | 5 sick leave days | 11 holidays)
• Trial period: 3 months

We are building a smart and powerful new platform that allows any customer to find, purchase, connect, and manage digital products in a new and completely seamless way.

Our platform aims to simplify the entire customer journey from selection, to purchase and on through connection and launch by challenging the status quo and antiquated way of doing things like setting up DNS, managing subscriptions, not being able to easily switch between products and add-ons, and revolutionizing those processes through the smart use of technology to bring forth better and more meaningful solutions.

Your expertise:

• Strong proficiency with JavaScript (ES6+)
• Knowledge of TypeScript and willingness to work with it
• Understanding and experience with Node.js server-side development
• Knowledge and experience with Docker
• Knowledge and experience with SQL
• Experience with one of the big cloud providers (AWS / Azure / GCP)
• Understanding the nature of asynchronous programming and its quirks and workarounds
• A strong culture of clean code and engineering excellence
• Understanding of Object-Oriented programming paradigm
• Understanding of SOLID principles in practice
• Knowledge of software design patterns & ability to apply them consciously
• Knowledge and experience with automated testing platforms and unit tests
• Understanding of HTTP protocol
• Knowledge of web security threats and ways to mitigate them
• Proficient understanding of Git
• Experience with DevOps practices — the ability to work with an application on all lifecycle stages: development, environment creation, maintenance on real environments
• Systematic approach to problem-solving
   

Will definitely be a plus:

• Knowledge other than JavaScript / TypeScript programming languages
• Understanding of client-side scripting
  • understanding of event loop, micro and macro tasks, and their influence on code
  • understanding the browser as a platform and browsers instruments for code debugging
• Experience with React and its infrastructure
• Competent use of English (reading, writing, and speaking)
   

What’s in it for you?

• Opportunity to deal with top-notch technologies and approaches in a world-leader product company with millions of customers
• Opportunity to make a difference for online privacy, freedom of speech, and net neutrality
• Decent market rate compensation depending on experience and skills
• Developed corporate culture: no micromanagement, culture based on principles of truth, trust, and transparency
• “You build it, you own it” mentality in most contexts
• Support of personal and professional development
  • coverage of costs of external trainings, conferences, professional literature
  • support of experienced colleagues
  • in-house events and trainings
  • regular knowledge sharing in teams
  • English classes and speaking clubs
• Life-balance support
  • truly flexible schedule, no time-tracking at all
  • 25 working days of vacation
  • 5 days of paid sick leave per month (if necessary) without providing a medical certificate
  • generous maternity leave program
• Professionally strong environment, friendly and open atmosphere, ability to influence the product development and recognition for it

You will be involved into:

• Full cycle development, implementing new features on BE (on FE on occasion)
• Introduce expertise and capability to deliver desired functionality
• Design, implementation, and coverage with tests of the system according to the product vision
• Validate software functional and non-functional requirements
   

Job Description

• Collaborate on the development and integration of AI-driven features, leveraging the latest advancements in LLM and NLP
• Conduct research and experiments to explore innovative AI methodologies and incorporate cutting-edge models into customer care products
• Take responsibility for the entire lifecycle of feature developments, from initial discussions with product teams, defining requirements and providing estimates, to actual coding in collaboration with the team, monitoring performance and delivering robust solutions to end-users
• Optimize system performance, reliability and stability, making sure our service remains seamless and accessible
• Participate in technical discussions to improve existing architecture and developer experience

Requirements

• 5+ years of experience as a Server Engineer
• Proven ability in designing server solutions, API design, and handling technical discussions
• Experience implementing and integrating gen-AI models, particularly large language models (LLMs) into production systems
• Passion for product development
• Understanding of business objectives and goals and how to transform business problems into actionable tasks
• Strong communication skills
• Proficiency with Large Language Models, including prompt engineering, fine-tuning, automatic evaluation and Retrieval-Augmented Generation (RAG) — an advantage

About the Team

The Chatbot team’s mission is to make the Customer Care Chatbot the principal choice for users seeking solutions during their Wix experience. We are committed to developing an AI Chatbot that leverages Wix’s knowledge and relies on contextual cues to determine the most appropriate next action to facilitate the user’s journey.

About Wix

Wix makes it possible for anyone to succeed online.

Since 2006, we’ve grown to around 5,500 employees in 22 countries, launched over 40 products, and serve over 243 million users and their visitors worldwide.

At Wix, we push you to innovate, evolve in non-traditional ways, and collaborate. We operate in small teams that work closely together at a high level.

Although we’re already industry leaders in web creation and business, our work is nowhere near done. Our goal is to become the main engine of the Internet so we can create a more open web for all.

We’re proud to be an equal opportunity company. Wix was built around the idea that everyone has the right to be successful, online. This same vision defines us as a company: creating a work environment where everyone is welcome, and anyone has the right to succeed.

At Enjoy Gaming, we’re a passionate team of industry experts, backed by market specialists and foreign investment. We’re thrilled to create live dealer shows and slots. We’re making our games to provide an even better gaming experience.
Our core values of ownership, communication, and honesty drive everything we do.
Join us and be part of our innovative journey in the gaming world!
We are currently seeking a Senior  Node.js Developer. You will collaborate closely with Product Owner, and other developers to transform complex requirements. You will also have the opportunity to mentor junior developers and contribute to the architectural decisions that shape our projects.
 

About you:
— 6+ years experience with backend in NodeJS/Express.
— Strong Knowledge of Nest JS / Typescript.
— Strong Knowledge of  SQL and NoSQL.
— Experience WebSockets and REST API.
— Experience using messaging and task-processing frameworks (e.g., BullMQ, RabbitMQ, etc.)
— Understanding of security, vulnerabilities, and approaches to avoid them.

— English level intermediate or higher.

Will be a plus:
— Experience in optimizing the performance of highly loaded systems
— Good understanding of GCP
— Experience with JavaScript, React.js
— Working principles with Docker/Docker compose

 

Responsibilities:
— Writing high-quality code
— Documentation: Create and maintain code and architecture documentation
— Collaborating with teams: Working closely with other developers, QA, designers, Product Owner, to ensure the successful delivery of projects
— Keeping an eye on security
— Participate in planning
— Solving complex problems
 

What you get in return:
— Competitive Salary: Competitive salary fixed in EUR with yearly performance reviews
— Tax Coverage: The company provides tax coverage
— Remote Work Option: Choose to work remotely, providing greater flexibility and comfort
— Corporate Benefits: Medical insurance, psychologist, English-speaking club
— Paid Vacation: 20 working days of paid vacation + 10 time off in lieu , including national holidays
— Paid Sick Leave: 10 working days
— Professional Development: Get reimbursement for professional development courses and training
— Self-Development: Get reimbursement for language courses, sports, massage, or life coach

📍 Remote | Full-time

🧩 Tech stack: Node.js, TypeScript, NestJS, PostgreSQL, Redis, Docker

🌍 Clients: UK, EU, USA

💬 English: Intermediate+

We’re looking for a Back-end Developer (Node.js) to join our team and help build a new scalable product from scratch — for international eCommerce markets.

This is a long-term role with full involvement in architecture, logic, and delivery. You’ll work closely with a cross-functional team (PM, Front-end, QA, Design) and participate in decision-making.

 What you’ll do:

Develop and maintain scalable back-end services using NestJS + TypeScript;

Design relational data models using PostgreSQL;

Implement efficient data access via TypeORM;

Optimize app performance using Redis caching;

Build and document RESTful APIs (GraphQL experience is a plus);

Work with Docker to containerize services;

Participate in deployment and CI/CD setup;

Collaborate with team members to shape features, resolve issues, and review code.

 Requirements:

1+ year of commercial experience with Node.js and NestJS;

Solid knowledge of TypeScript and backend architecture principles;

Experience with PostgreSQL and ORM (TypeORM or similar);

Working knowledge of Redis;

Experience with Docker in development environments;

Understanding of RESTful APIs and authentication (OAuth2, JWT);

Git workflow familiarity and team collaboration experience;

Intermediate English or higher — ability to read docs and discuss tasks with the team.

Nice to have:

Experience with GraphQL;

Knowledge of CI/CD tools (e.g., GitHub Actions);

Familiarity with message brokers (e.g., RabbitMQ, Kafka);

Previous experience in eCommerce or SaaS projects.

We offer:

Full-time remote work in a growing product-oriented team;

Involvement in building a new product architecture from day one;

Regular performance & salary reviews;

Supportive team, direct communication, no bureaucracy.

We are specifically looking for a JavaScript/Node.js Developer with experience working with AI integrations. We are ready to offer assignments on ongoing AI-related projects.  

Requirements: 

• 4+ years of commercial experience with back-end development using Node JS  
• 1+ years of commercial experience with integrations with LLMs (OpenAI ChatGPT, Anthropic Claude, or similar) 
• Willing to keep up with AI trends, ability to investigate new approaches 
• Intermediate or higher English  

Would be a plus: 

• Experience with Azure AI Services or Amazon Textract 
• Experience with Langchain or LLamaIndex 
• Experience with Nest JS 
• Experience with modern frontend frameworks React.js or Vue.js 
• CI/CD processes experience 

• Knowledge of Unit Testing frameworks 

   

Responsibilities: 

• Development of new functionality  
• Investigate and integrate AI services 
• Constantly learn and extend the expertise  
• Take part in code reviews 
• Create and maintain tech documentation

Please note
By clicking the “Apply” button for the vacancy, you automatically consent to process your personal data.

We sincerely appreciate each response and the expressed interest in our job opening. If we do not contact you within a week, it means that, at this moment, your CV has not been selected for further consideration for this position. Nevertheless, we will keep your resume in our candidate database and will definitely inform you if a vacancy that matches your experience becomes available.

Ascendix Technologies is a global technology company delivering innovative cloud and AI-powered solutions since 1996. With offices across Europe and a remote-first culture, we combine deep technical expertise with a forward-looking mindset to build scalable, intelligent applications. 

Are you passionate about Node.js and eager to work in a cutting-edge environment where AI is integral to the development process? At 

Ascendix, we embrace “vibe coding” — a collaborative approach where developers write approximately 50% of their code with AI assistance. This role is for you if you want to be at the forefront of AI-augmented software development. 

As a Node.js Developer with AI expertise, you will: 

• Develop backend services primarily in Node.js, leveraging AI tools to generate roughly half of your codebase. 
• Collaborate closely with AI coding assistants (e.g., OpenAI, Anthropic models) to accelerate development while maintaining high code quality. 
• Experiment with AI-driven workflows and continuously improve the integration of AI-generated code into production systems. 
• Participate in code reviews, ensuring AI-generated contributions meet maintainability and security standards. 

• Document technical solutions and share AI best practices within the team. 

   

What We Expect 

• Minimum 4 years of professional experience with Node.js and backend development. 
• Hands-on experience working with AI and Large Language Models (LLMs) in software development over the past year. 
• Comfort with writing and reviewing code where approximately 50% is AI-generated, embracing a vibe coding mindset. 
• Be an advanced user of Cursor, Github Copilot, Windsurf, Trae, or similar AI-first IDEs. 
• Hands-on Experience with using UI generating assistants like v0.dev, lovable, replit, bolt, or similar. 
• Strong English communication skills (Intermediate+). 
• Familiarity with cloud AI services (Azure AI, AWS Textract) and frameworks like NestJS is a plus. 
• Understanding of CI/CD pipelines and automated testing.

Please note
By clicking the “Apply” button for the vacancy, you automatically consent to process your personal data.

We sincerely appreciate each response and the expressed interest in our job opening. If we do not contact you within a week, it means that, at this moment, your CV has not been selected for further consideration for this position. Nevertheless, we will keep your resume in our candidate database and will definitely inform you if a vacancy that matches your experience becomes available.

We are looking for enthusiastic backend addition to our perspective team! Our company highly evaluates the professional with next personal skills:

Adaptivity
Responsibility
Openness to grow with the team
Initiative 

Our company uses next stacks and frameworks:
NestJs
NodeJs
PostgreSQL
GraphQL
The work is remote, 5/2 
The communication within the team is on English!

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 2-years commercial experience in the back-end development;
— Node.js Nest;
— MSSQL, MySQL, PostgreSQL;
— RabbitMQ, Redis Cache, BullMQ;
— JIRA, gitflow;
— EVM-based blockchains (Ethereum, Avalanche, Polygon, Binance Smart Chain, Velas, Hedera etc);
— Deep understanding of EVM 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.


 

About the job

As a Senior Back-end Engineer, you will contribute to the development of our cutting-edge Gambling and Casino Platform, architecting secure, scalable services that ensure real-time transaction processing, high traffic reliability, and seamless third-party integrations. Your focus will be on optimizing performance, enforcing compliance, and building resilient APIs and algorithms to power critical features like odds calculation, payments, and user authentication.

Collaborating with cross-functional teams, you will drive the platform’s technical backbone, ensuring uptime and efficiency for global users. Your work will set industry standards through innovative back-end solutions, rigorous testing, and a commitment to maintaining mission-critical system integrity.

Responsibilities:

• Design, develop, and maintain backend services for our Gambling and Casino platform.
• Optimize and scale PostgreSQL databases for high performance and reliability.
• Collaborate with the engineering team and other stakeholders to deliver seamless integrations and new features.
• Write clean, maintainable, and well-documented code following best practices.
• Troubleshoot and debug issues, ensuring the stability and performance of the system.
• Participate in code reviews and contribute to ongoing technical growth and improvement.
• Stay up-to-date with industry trends and technologies to continuously improve our product.
  
   

Requirements & Skills
Experience

• 5+ years of experience in software development with JavaScript/TypeScript and Node.js, preferably for complex high-load web applications in iGaming or Fintech domains.
  
   

Technical Skills

• Proficiency in JavaScript/TypeScript.
• Expertise in Node.js, Nest.js, TypeORM, PostgreSQL, and Redis.
• Understanding of SQL and NoSQL database architecture, optimization, and management.
• Experience with real-time communication technologies (e.g., WebSockets).
• Experience writing and executing tests, including unit, integration, and failure tests.
• Understanding of RESTful APIs, microservices architecture, and event-driven systems.
• Knowledge of Docker, Kubernetes, and the concepts and benefits of CI/CD processes.
• Understanding of SOLID, GRASP, CQRS principles, GoF design patterns, and DDD concepts.
• Knowledge of Event Sourcing, including events, aggregates, projections, and event streams.
• Knowledge of traditional monolithic architectures, microservices architecture, and hexagonal architecture's emphasis on separation of concerns.
• Understanding and practice of Agile development methodology and its Scrum and Kanban frameworks.
  
   

Our recruitment process typically follows these stages: 

• Application screening
• Interview Stages (2-3 weeks):
• Job Offer
• Referrals: Employment and Background Check

Project Overview:
We’re developing a cutting-edge dental application that connects dental practices with laboratories to streamline workflows and enhance patient care.

Tech Stack:

• Language: Strong expertise in TypeScript;
• Backend: NestJS, Prisma, PostgreSQL;
• Messaging: Kafka or RabbitMQ;
• Cloud: AWS (S3, EC2, Lambda);
• DevOps: Kubernetes;
• Security: JWT, crypto libraries;

• Additional: Zod, RxJS.

   

Responsibilities:

• Develop and maintain backend services using NestJS and Prisma;
• Design and optimize PostgreSQL database schemas and queries;
• Build robust, event-driven systems with Kafka or RabbitMQ;
• Manage cloud infrastructure and serverless functions on AWS;
• Implement secure authentication and authorization flows using JWT;
• Support containerized deployment pipelines via Kubernetes;
• Contribute to architecture decisions and codebase improvements.

Requirements:

• 3+ years of backend development experience;
• Strong knowledge of TypeScript and Node.js;
• Deep understanding of scalable backend architectures;
• Hands-on experience with AWS and Kubernetes;
• Familiarity with security best practices and cryptographic libraries;
• Bonus: experience with RxJS and schema validation using Zod.

What We Offer:

• Flexible remote work;
• Competitive salary;
• A product with meaningful impact in healthcare;
• Opportunity to work with modern cloud-native technologies.

MustardHub is a B2B SaaS startup in the employee benefits, rewards & recognition space.

We've built our MVP in 2023, confirmed the hypothesis with several large customers, and are now underway building the v1 from ground-up.

This position is for an experienced, autonomous back-end developer. We're a very small team, led by the two co-founders, with an 2 FE & 2 BE devs, BA/PM, QA, and a talented designer. 

About You:

- 5-7+ years experience building large, complicated codebases

- You've worked on large B2B or B2C SaaS products

- You understand what working in early-stage startups is like

- Your English is good enough to have conversations with patient fluent speakers

- You are EXCITED about being on the ground floor of a startup that changes how companies approach employee rewards & benefits management

- You're using modern AI coding tools like Cursor, v0, Claude Code and/or others to increase your output 2-4x.

Our Tech Stack:

- Typescript: React, Nest, GraphQL/Apollo, Postgres. 

We're based in Austin, TX (US) but the development team is expected to be all remote. The other team members are in Ukraine and the rest of Eastern Europe. You're expected to have at least a few hours overlap with the CDT timezone each day.

Location: Remote

Job Type: Project Contract 4 months

Start Date: ASAP (As Soon As Possible)

Please note: This is a contract position with an immediate start date. We are looking for a candidate who can quickly integrate into our team and begin contributing from day one.

About Us

TechChain Solutions is a dynamic technology firm focused on building high-performance financial platforms. We create sophisticated tools that empower users to navigate complex market environments with speed and reliability. Our team is driven by innovation, and we are currently developing a new trading platform from the ground up.

The Role

We are seeking a skilled Middle Nest.js Developer to join our core backend team. You will step into a project with a well-structured, high-quality codebase and play a key role in implementing complex business logic within our microservices architecture.

Your primary focus will be the automation of trading operations on Centralized Exchanges (CEX). You will be responsible for translating trading strategies into robust, high-performance code, building out the logic for working with orders, and ensuring seamless, low-latency integration with various exchange APIs. This is a hands-on role where you will be writing the code that powers our automated trading bots.

Key Responsibilities:

1. Develop and Maintain Backend Services with Nest.js and TypeScript. Your core task will be to write clean, efficient, and reliable code within our existing microservices architecture, focusing on the implementation of trading-related features.
2. Work with Databases using Prisma ORM. You will be responsible for writing queries, managing data, and working with schemas in PostgreSQL, using Prisma as the primary tool for database interaction.
3. Work with a Large, Existing Codebase. You will need to quickly get up to speed with our current architecture, understand how the services interact, and continue development while adhering to our established quality standards.
4. Integrate with Third-Party CEX APIs (REST & WebSocket). You will implement the logic to connect with centralized exchanges to fetch order books, manage trades, and handle real-time market data.
5. Implement Trading Logic and Automation. You will translate trading strategies and business requirements into functional code, building out the core logic for our Order Service and automating actions with exchanges.
6. Collaborate with the Team. You will work closely with the Backend Lead, other developers, and the frontend team to define and ship features in a fast-paced environment.

Required Qualifications & Skills (Must-Haves):

• 2.5+ years of professional experience in backend development with Node.js and TypeScript.
• Strong, hands-on experience building applications with the Nest.js framework.
• Solid experience with relational databases, specifically PostgreSQL, and practical skills using Prisma ORM.
• Hands on using CEX DEX
• Experience integrating with complex third-party APIs.
• Experience with message broker technologies (we use BullMQ).
• Proficiency with Git and modern development workflows.

• A proactive mindset with strong problem-solving skills.

   

How to know if you are the right fit:

• You understand the differences between a CEX (Centralized Exchange) and a DEX (Decentralized Exchange) and have hands-on experience using both.
• You are comfortable working within an existing microservices architecture and can quickly adapt to a large codebase.
• Will be a big plus if you have practical experience building trading bots or other systems that automate actions with exchange APIs.
• You understand the difference between a Limit Order and a Market Order and understand what is Order Book and hot it works.
• You have a strong interest in the Crypto/FinTech space and are eager to work on a high-performance trading platform.

What We Offer:

- Competitive compensation.

- A fully remote and flexible work environment.

- The opportunity to work on a high-impact, greenfield project with a modern tech stack.

- A focused and collaborative team culture.

Location: Remote

Job Type: Project Contract 4 months

Start Date: ASAP (As Soon As Possible)

Please note: This is a contract position with an immediate start date. We are looking for a candidate who can quickly integrate into our team and begin contributing from day one.

About Us

TechChain Solutions is a dynamic technology firm focused on building high-performance financial platforms. We create sophisticated tools that empower users to navigate complex market environments with speed and reliability. Our team is driven by innovation, and we are currently developing a new trading platform from the ground up.

The Role

We are looking for a skilled Middle Nest.js Developer with a strong practical background in blockchain and Web3 technologies. You will join our team to focus on the implementation and maintenance of our DEX-focused services, working primarily on the logic involving wallets, on-chain transactions, and smart contract interactions, which is the core of our platform's on-chain operations.

Your main tasks will be to develop microservices and work within a large codebase, writing the code that interacts directly with multiple blockchains (EVM, Solana, TON), managing secure transaction signing, and implementing logic for DEX trading strategies. This is a hands-on role where you will work with libraries like Ethers.js, solana/web3.js, and ton/ton to build reliable and secure on-chain solutions within our existing Nest.js microservices architecture.

Key Responsibilities:

1. Develop and Maintain Backend Services with Nest.js. Your primary responsibility will be to write clean, secure, and efficient TypeScript code, focusing on on-chain interactions, wallet management, and transaction processing.
2. Work with Databases using Prisma ORM. You will manage data related to wallets, groups, and transactions in our PostgreSQL database using Prisma.
3. Work with a Large, Existing Codebase. You need to be able to quickly understand our current microservices architecture and contribute high-quality code that aligns with our standards.
4. Implement DEX-related Logic. You will write code that interacts with Automated Market Maker (AMM) protocols (like Uniswap), handles token transfers (ERC-20 & SPL), and manages the lifecycle of on-chain transactions.
5. Contribute to our Asynchronous Task System. You will work with our existing transaction processing system built on BullMQ and Redis to ensure reliable and scalable on-chain operations.

Required Qualifications & Skills (Must-Haves):

• 2.5+ years of professional experience in backend development with Node.js and TypeScript.
• Strong, hands-on experience building applications with the Nest.js framework.
• Solid experience with relational databases (PostgreSQL) and practical skills using Prisma ORM.
• Deep, practical experience with Web3 libraries for at least one of the following blockchains: EVM-compatible chains (using ethers.js/web3.js), Solana, or TON.
• Solid understanding of blockchain fundamentals: transactions, the mempool, gas, blocks, and smart contracts.
• Hands-on experience interacting with ERC-20 and/or SPL token contracts.

• A proactive and security-first mindset, especially when dealing with private keys and on-chain funds.

   

How to know if you are the right fit:

• You understand what GAS is, why it's needed, what is difference between sending ETH and ERC20 tokens. You are familiar with the concept of a dedicated "gas wallet".
• You know the DIfference betwen DEX and CEX. You understand what is Automated Market Maker (AMM) on a DEX works and can explain its key differences from a traditional Central Limit Order Book (CLOB) found on CEXs.
• You have practical experience sending tokens between wallets and calling methods on smart contracts.
• You are excited by the challenge of building a secure and scalable system that manages a large number of wallets and performs on-chain actions.

What We Offer:

- Competitive compensation.

- A fully remote and flexible work environment.

- The opportunity to work on a high-impact, greenfield project with a modern tech stack.

- A focused and collaborative team culture.