Senior Full Stack Engineer (Ref IN050)

We’re seeking a Senior Full Stack Engineer (React + TypeScript) to join our team and help build next-generation tools that power the global renewable energy transition. You’ll take ownership of impactful features, from concept to deployment, contributing directly to the quality and scalability of a platform used worldwide.

About the Client
Sitemark is a Belgian technology company accelerating the world’s shift to renewable energy through advanced data and AI-powered insights. Its all-in-one platform enables leading solar and energy companies to optimize productivity, quality, and performance across every stage of their projects. Trusted by top renewable energy players, Sitemark has supported more than 10,000 projects across 82 countries.

About the Project
You’ll be part of a team enhancing Sitemark’s intelligent platform, used by global energy providers to monitor, analyze, and optimize renewable energy assets through drone data and AI. The project combines cloud-native technologies, full-stack development, and modern engineering practices to deliver a scalable, data-driven system that powers decision-making for sustainable energy infrastructure.

Key Responsibilities:

• Lead the end-to-end development of new platform features, from planning and prioritization to implementation, testing, and deployment;

• Collaborate closely with product managers and engineering peers to shape both technical solutions and product direction;

• Contribute to architectural decisions, ensuring high performance, maintainability, and scalability;

• Write clean, efficient, and well-tested code following best practices;

• Participate in product brainstorming, refinement, and continuous improvement sessions;

• Proactively share knowledge and mentor peers within a small, agile team.

Qualifications:

• Strong fluency in JavaScript/TypeScript, React, and Node.js;

• Solid understanding of or strong interest in cloud infrastructure (PostgreSQL, Azure, AWS, Docker);

• Proven experience developing scalable, production-grade applications;

• Passion for writing clean, maintainable, reusable code with a focus on testing and best practices;

• Ability to quickly learn and adapt to new technologies;

• Collaborative mindset and self-driven approach to problem-solving;

• Experience with Python or Machine Learning is a plus.

In exchange for your skills, we offer:

• Supportive relationships, built on transparency and a flat structure, in a diverse and multinational team;

• Office in the center of historical Kraków, where your dog is always welcome;

• Flexibility when it comes to working from the office or home;

• Perks include Multikafeteria, Group Life Generali insurance, Signal Iduna, Multisport, language lessons 1:1;

• Sport and other events, including weekly running, squash, and team lunches on the house;

• Free tea, coffee, and all-you-can-eat fruits and nuts in the office.

The recruitment process includes:

• HR screening 30min zoom call;

• Technical Challenge: Coding round, Problem Solving round, Brainstorming round;

• Making an offer meeting.