Senior Full Stack Engineer

About the Position

Join Geniusee as a Senior Full Stack Engineer to design and develop scalable full-stack applications using React, Node.js, and TypeScript. We help businesses thrive through technology partnerships and strengthen the engineering community by sharing knowledge and creating opportunities. Here, you’ll find a safe, inclusive, and supportive environment where your voice is heard, and feedback is welcome.

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.

Requirements

General

• 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 AI coding assistants like Claude Code, Codex, Copilot, Cursor, or similar tools.
• Ability to effectively use AI coding assistants and review AI-generated code.

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.

We Offer

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.

About the Company

At Geniusee, we live by our values: Continuous Growth, Team Synergy, Taking Responsibility, Conscious Openness, and Result-Driven Mindset. Whether you want to work from home or from our offices in Kyiv, Lviv, or Warsaw with stable electricity and Wi-Fi, we’ve got you covered. Join us and make an impact.