About the project

• We’re looking for a Principal Engineer to lead the evolution of our platform as we transition from a monolithic codebase to a modern, service-oriented architecture. Your decisions will define how we scale over the next 5 years, influencing everything from system design to engineering culture.
• This is a high-impact, hands-on leadership role where you’ll shape architecture while staying connected to real-world implementation. You’ll collaborate closely with senior leadership, engineering squads, and product partners to define and execute a pragmatic, scalable technical roadmap. Executive leadership is fully aligned on platform modernization, and you’ll be at the forefront of that effort.
• Beyond technical excellence, we value strong collaborators who can foster a culture of mentorship, promote in-person engagement within our local engineering teams, and cultivate global partnerships with distributed peers. You’ll be surrounded by experienced, motivated engineers who are eager to build, grow, and elevate the systems and people around them.

Your responsibilities

• Own the architecture and delivery of core backend systems using modern, service-oriented design patterns.
• Lead the migration from a monolith to a microservices-based platform, guiding both technical execution and cultural adoption.
• Establish engineering standards for Node.js, MongoDB, Kafka, AWS, Docker, and Kubernetes, ensuring they scale with the business.
• Collaborate with engineering squads, leadership, and the business to shape the technical roadmap and evaluate trade-offs for long-term success.
• Mentor engineers across squads, growing their architecture and design skills while embedding quality and scalability into our culture.
• Influence cross-functional initiatives, from DevOps integration to platform reliability to developer experience improvements.
• Stay connected to code while shaping systems holistically - you're not expected to do all the coding, but you're comfortable diving into critical paths when needed.

Our requirements

• 10+ years of backend software engineering experience, including at least 2+ years in staff, principal, or architect-level roles.
• Demonstrated experience designing and evolving distributed systems and leading large-scale technical migrations (e.g., monolith to microservices).
• Strong proficiency in Node.js and production experience with MongoDB, Kafka, and cloud platforms (AWS preferred).
• Experience operating within Docker/Kubernetes-based environments at scale.
• Ability to influence cross-team direction, mentor senior engineers, and drive consensus on complex trade-offs.
• Comfortable communicating architecture to diverse audiences - from hands-on devs to senior executives.
• Passion for scalable design, performance tuning, and thoughtful abstraction - you think like a systems builder.

Technologies we use

What we offer

• A high-growth, friendly, and engaging work environment with opportunities for career development.

• Additional vacation days for better work-life balance.

• Modern office in Warsaw’s Powiśle district with Vistula River views, recreational facilities, and great nearby restaurants.

• Thoughtfully designed private medical package to take care of what matters most.

• Sports card to fuel your active lifestyle.

• Life and accident insurance for peace of mind.