Senior Full Stack (TypeScript) Engineer

Salary range: B2B - 35 E/h + VAT 💰 Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Poland. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

As a Senior Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow.

Build production AI agents: develop TypeScript services on AWS (Lambda, Step Functions, DynamoDB, Bedrock) using Strands or LangGraph and AI SDKs Design agent behavior: define what the model investigates and what code enforces Sandbox agents: build read-only runtimes, scoped tool access, worktree-contained reads, and budget/timeout guards against model misbehavior Evaluate AI features: build golden sets and production replays, calibrate judges, gate changes on recall, precision and false-positive rate, and compare models and effort levels before release Ensure observability: emit reason-coded metrics and structured logs, alert on failures, and investigate production misses in Splunk and Victoria

Metrics Run infrastructure: maintain Terraform roots across environments under tagging and permission-boundary rules; improve GitLab CI/CD for build, test, deploy and qual