Middle Full-Stack Engineer

Research & Development

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Ukraine, Europe, remote

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January 29, 2026

Our client is an early-stage startup seeking a Middle Full Stack Developer to support the development and evolution of a Telegram Mini App and its backend services.

This role is ideal for an engineer with strong hands-on experience who is comfortable working across the full stack — from frontend development within Telegram WebView to building and maintaining backend services. The successful candidate will contribute to production-ready features while growing their expertise in system design, scalability, and robust, real-world engineering practices.

The position offers the opportunity to work in a fast-paced startup environment, take ownership of meaningful technical decisions, and directly influence the product’s architecture and future growth.

Responsibilities

Implement backend services and core application logic under existing architecture guidelines;
Build responsive and performant user interfaces for Telegram WebView;
Develop features for Telegram Mini Apps using the Telegram WebApp API;
Implement secure validation of Telegram initData;
Contribute to the development of scalable and reliable backend components;
Work on real-time or event-driven features;
Take part in design and optimization of data models and storage layers;
Integrate with third-party services and external APIs;
Participate in maintaining automated build, test, and deployment pipelines;
Work with a monorepo codebase (frontend + backend);
Take part in code reviews and technical discussions.

Requirements

3+ years of professional full stack development experience;
Good knowledge of JavaScript / TypeScript;
Frontend experience with React, including SPA development;
Basic experience building or maintaining applications for Telegram Mini Apps / WebView;
Familiarity with the Telegram WebApp API and its core concepts;
Backend experience with Node.js and structured backend frameworks (such as NestJS);
Experience working with relational databases, preferably PostgreSQL;
Familiarity with Prisma or similar ORM tools;
Understanding of web security principles (request validation, data integrity);
Familiarity with real-time or event-driven systems;
Understanding of CI/CD pipelines (preferably GitHub Actions);
Experience working with Docker and containerized applications;
Ability to work independently and take ownership of complex features;
Upper-Intermediate English level.

Bonus points for

Experience with Redis (caching, sessions, rate limiting);
Experience with monorepo setups (pnpm / yarn workspaces);
Experience with Vite, TanStack Query, React Router;
Experience configuring Nginx as reverse proxy;
Experience integrating payments in Telegram Mini Apps;
Startup background.

We offer excellent benefits, including but not limited to

People-oriented management without bureaucracy;
Flexible schedule;
15 working days of annual paid vacation;
Paid sick-leaves;
Friendly and engaging professional team;
Opportunities for self-realization, career, and professional growth;
Accounting and legal support.

Middle Full-Stack Engineer

Responsibilities

Requirements

Bonus points for

We offer excellent benefits, including but not limited to

Application form

Team needs

Careers

Agile Fuel HQ

Middle Full-Stack Engineer

Responsibilities

Requirements

Bonus points for

We offer excellent benefits, including but not limited to

Application form

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Team needs

Careers

Agile Fuel HQ