Full-Stack Engineer (React & Kotlin)

We are hiring on behalf of our client a global innovator in fitness and wellness technology. Their mission is to empower people to live fit strong long and happy lives by delivering integrated experiences to millions of members anytime anywhere.

As a Full-Stack Engineer you will join the e-commerce team responsible for scaling a billion-dollar online business. Youll play a key role in shaping and executing the technical roadmap delivering robust high-performing solutions across both frontend and backend systems. Working closely with Product Design Marketing and international engineering teams youll influence architectural decisions promote engineering best practices and help evolve a modern microservices-based platform. This role combines hands-on development with technical leadership mentorship and strategic thinking.

Key takeaways:

Stack: Kotlin Spring React TypeScript JavaScript nice to have: AWS

Salary:

• Mid: 20 000 PLN - 24 000 PLN gross on the Contract of Employment
• Senior: 25 000 PLN - 30 000 PLN gross on the Contract of Employment

Working model: Hybrid - 3 days/week from the office

Location: ul. Grzybowska Warsaw

Recruitment process:

1. A call with Motife Recruiter
2. Interview with Hiring Manager
3. Panel interviews with the team (coding architecture and cross-collaboration interviews)

Responsibilities:

Full-Stack Development

• Design and build high-performance user-friendly web experiences using modern frontend technologies.
• Develop and maintain scalable backend services and APIs using Kotlin.
• Deliver clean testable and maintainable code that sets a quality benchmark for the wider team.

Architecture & Technical Skills

• Contribute to architecture and system design decisions with a focus on scalability reliability and performance.
• Lead technical discussions architecture reviews and design documentation.
• Drive the evolution of microservices and backend-for-frontend patterns.

Engineering Excellence

• Champion best practices across Agile DevOps and SRE principles.
• Support continuous improvement across tooling processes and delivery pipelines.
• Promote a culture of quality ownership and continuous learning.

Requirements:

Technical Expertise

• 4 years of professional software engineering experience.
• Strong experience with Kotlin or Java and Spring.
• Proven background in API development and distributed systems.
• Experience working with relational databases such as PostgreSQL.
• Familiarity with containerization and CI/CD tools (Docker Kubernetes GitHub Actions).

System Design & Scalability

• 3 years of experience contributing to system architecture and technical design.
• Understanding of reliability scalability and performance considerations in production systems.
• Experience working with microservices-based architectures.

Mindset & Collaboration

• Strong product-focused and user-centric mindset.
• Comfortable working in fast-paced evolving environments.
• Excellent communication skills and ability to collaborate cross-functionally.
• Passion for learning experimentation and continuous improvement.

What we offer:

• 100% paid medical care
• Multisport
• Creative tax (KUP)
• Home office allowance
• MacBook Pro

Apply now

If this sounds like your next step wed love to hear from you! Please apply via our careers page and submit your CV in English.

Required Experience:

IC