Job Description – Full Stack Engineer (Trust Domain)

Location: Remote (Poland)

Salary: 250-380k PLN

Why this role matters

Help unlock the world’s engineering potential by shaping the future of technical hiring. Join Codility’s Trust team to pioneer the next generation of assessment integrity, ensuring our platform is secure, fair, and reliable for millions of candidates and enterprise customers globally.

What you’ll do

Pioneer AI-Powered Integrity

• Drive features across the full stack (Python/Django/FastAPI, React), taking full ownership from design to production and delivery.
• Embrace and apply AI/LLM tools and components pragmatically
• Develop fraud detection and proctoring solutions that balance security, accuracy and candidate experience.
• Improve detection signals and reduce false positives using data-driven approaches.

Scale and Optimize

• Make pragmatic architecture choices within established patterns
• Champion a culture of engineering excellence, building highly observable, scalable, and resilient systems (metrics, structured logs, traces) that minimize complexity and can handle sudden traffic spikes

Collaborate & Deliver

• Translate integrity needs into working features in partnership with Product and UX.
• Work closely with Data/ML engineers to integrate models and evaluation pipelines.
• Share knowledge: write clear design docs, participate actively in code reviews.

Elevate the Team

• Mentor peers through thoughtful code reviews and pairing.
• Bring fresh perspectives in AI-native engineering practices (prompt design, retrieval tuning, evaluation design).
• Model ownership and initiative: identify risks early, design mitigation options, propose solutions and explain tradeoffs; and see projects through to completion.
• Stay curious: propose new technologies, and apply them pragmatically.

What we’re looking for

• 5+ years of professional software engineering experience.
• Strong backend (Python/Django/FastAPI or similar) and will not shy away from frontend (React or similar).
• Track record of end-to-end customer outcomes delivery in distributed remote-teams.

Impact you’ll have

• Strengthen enterprise confidence in Codility’s assessments.
• Shape the next generation of integrity systems for technical hiring.
• Help the Trust team grow by bringing seniority and experience.