Senior Full Stack Engineer

At Geniusee, we help businesses thrive through technology partnerships and strengthen the engineering community by sharing knowledge and creating opportunities 🙌
We live by our values: Continuous Growth, Team Synergy, Taking Responsibility, Conscious Openness, and Result-Driven Mindset. Here, you’ll find a safe, inclusive, and supportive environment where your voice is heard, and feedback is welcome 🤗
Whether you want to work from home or from our offices in Kyiv / Lviv / Warsaw with stable electricity and Wi-Fi, we’ve got you covered.

Join us and make an impact 💜

About the project: Payment backend platform.

Requirements:
● 5+ years of commercial software development experience;
● Upper-Intermediate English (spoken and written);
● Strong understanding of OOP, SOLID, Functional Programming, and design patterns;
● Experience with Git and standard branching workflows;
● Strong architectural mindset and problem-solving skills;
● Experience working in FinTech is a strong plus.

Backend (Node.js):
● 5+ years of commercial experience with Node.js and TypeScript;
● Experience with NestJS or similar backend frameworks;
● Hands-on experience with AWS services;
● Experience with Serverless and Event-Driven Architecture;
● Strong knowledge of SQL and relational databases (PostgreSQL/MySQL);
● Experience designing scalable APIs and secure backend services.

Frontend (React.js):
● 4+ years of commercial experience with React and TypeScript;
● Experience with TanStack Query, GraphQL (Apollo), and Vite;
● Experience with MUI, Shadcn/UI, and Tailwind CSS;
● Experience building responsive and modern user interfaces.

AI-Assisted Development:
● Experience with Claude Code, Codex, Copilot, Cursor, or similar AI tools;
● Ability to effectively use AI coding assistants and review AI-generated code.

Responsibilities:
Software Development:
● Design, develop, and maintain scalable full-stack applications using React, Node.js, and TypeScript;
● Build secure APIs, modern user interfaces, and event-driven solutions;
● Integrate databases and third-party services.

Architecture & Engineering:
● Design scalable application architecture and backend solutions;
● Deliver clean, maintainable, and well-tested code;
● Improve application performance, scalability, and reliability.

Collaboration:
● Participate in planning, estimation, technical discussions, and code reviews;
● Collaborate with cross-functional teams and stakeholders;
● Contribute to engineering best practices and AI-assisted development workflows.

Nice to Have:
● Experience with workflow automation tools (e.g., n8n);
● Experience with event-driven technologies (Kafka, SNS/SQS, EventBridge, RabbitMQ);
● Experience integrating LLM APIs (OpenAI, Anthropic) or building AI-enabled applications;
● Experience with Business Intelligence (BI) tools.

What will you get:
Career growth & projects
● Competitive salary based on your skills and experience, and a benefits package.
● Regular performance appraisals to support your career development.
● Professional development support: online courses, certifications, and study compensation (including English courses).
● A modern tech stack across challenging, long-term projects.

Health & well-being
● Paid vacation (18 working days) and sick leave (15 days).
● VIP medical insurance or sports coverage.

Work environment & flexibility
● Remote work from anywhere in the world or in one of our offices in Kyiv, Lviv, or Warsaw.
● Necessary equipment to perform your work.

Culture & community
● A collaborative and open culture where contributions are recognized.
● Regular corporate online & offline activities.
● Geniusee Charity Fund, making a difference beyond tech.