Senior Backend Engineer

Location: Remote (Poland; B2B or Employment contract possible)

The role

Help unlock the world’s engineering potential by shaping the future of technical hiring !

You will join Codility’s Hire team, responsible for core hiring workflows across Screen, Interview and Events, as well as Trust - the systems that help protect assessment integrity and reduce cheating. This team builds the tools and workflows behind how companies screen engineers, run technical interviews and manage hiring.

Impact you’ll have

Shape core product experiences.

Help customers run better technical hiring processes globally.

Contribute across the stack to deliver thoughtful, reliable product improvements.

What you’ll do

• Build product features end to end, with a strong focus on Python backend development using Django and FastAPI, while contributing to React and other parts of the stack where needed.
• Work closely with Product, Design and engineers to turn problems into simple, effective solutions.
• Make pragmatic technical decisions and build scalable, resilient and observable systems.
• Contribute to cloud and infrastructure work where needed, with AWS being the main environment.
• Help move the product forward, not just within a narrow ownership area.
• Contribute to product iteration in a distributed team where engineers have real ownership and a say in what gets built and how.
• Use AI and LLM tools pragmatically where they add real value.

What we’re looking for

• Strong backend engineering experience, ideally in Python (Django and/or FastAPI)
• Some frontend (React) experience, with the ability to contribute anywhere across the stack when needed.
• Track record of building and shipping product features end to end.
• Experience working in a distributed product team with ownership, iteration and meaningful engineering input.
• Good product judgment and strong instincts around tradeoffs, maintainability and user impact.

Nice to have

• Experience with PostgreSQL, Redis, Celery, AWS, Docker and Kubernetes.
• Experience building or operating observable production systems.
• Experience with real-time collaboration features, experimentation, analytics, search or ranking.

How you’ll work

• Remote-first across Poland.
• One-team mindset: no silos and no “not my problem”.
• Pragmatic, product-minded engineering with a strong sense of ownership.
• Flexibility to contribute wherever the team needs you most.