Senior Product Engineer (React + TypeScript, .NET)

Quick Facts

You’ll co-own product outcomes and lead end-to-end feature delivery—from hypothesis and architecture to deployment, monitoring, and user feedback.

Description

You’ll act as a real engineering partner for product discovery and build production features that translate hypotheses into measurable value. The role combines strong engineering decision-making (ADRs, DDD/bounded contexts), operational ownership (SLO/SLI, observability, DORA metrics), and full-stack delivery using React + TypeScript and .NET on Azure.

Requirements

• 6+ years of commercial fullstack engineering experience with production backend and frontend work
• Demonstrated co-ownership of product decisions (what to build and how)
• Ability to define feature success metrics upfront as leading indicators for business outcomes
• Independent use of product analytics (Amplitude) to inform prioritization
• Ability to write ADRs with options, criteria, and recommendations before major changes
• End-to-end ownership: deploy, monitor, and collect user feedback
• Operational maturity: SLO/SLI, structured logging, Application Insights (KQL + distributed tracing)
• DDD and bounded contexts experience, including integration design between contexts
• Backward-compatible API/versioning and safe, phased migrations with rollback
• Security and regulatory design awareness (UOFP, NIS2/KSC)
• CI/CD pipeline ownership
• Risk-based testing (unit/integration/E2E) and experience with feature flags/canary/dark launches

Hard Skills & Technologies

• React
• TypeScript
• .NET
• ASP.NET Core
• EF Core
• MediatR
• MS SQL Server
• Azure
• App Service
• Application Insights
• Service Bus
• Redux
• Zustand
• Jotai
• CI/CD
• KQL
• Distributed Tracing
• DDD
• Bounded Contexts
• CQRS
• Event Sourcing
• Saga
• Outbox
• Idempotency Keys
• SLO
• SLI
• Structured Logging
• Unit Testing
• Integration Testing
• E2E Testing

Benefits

• B2B agreement on partner terms (net PLN 25–30k range)
• 26 days per year without services while keeping agreed compensation
• Flexible remote or hybrid work; team meetings about once per month in Poznań or Katowice
• Equipment choice (Windows or macOS)
• Training and conference budget
• Medical package and sports card on preferential terms

AI tooling is part of the daily workflow, supporting your development pace and quality.