Harnessers is a collective of senior developers, co-founded with Clément Bresson, helping solo developers and small teams who shipped fast with AI coding tools but now find themselves alone with a codebase too complex to maintain safely. We audit the code, fix what’s fragile (security, architecture, maintainability) and build a custom AI “harness” around the project so our clients can keep shipping at AI speed without the AI silently breaking things.

Services range from a fixed-price €1,000 audit with a live consultation, to quoted fixes and custom harnesses, to fractional engineering at a day rate for teams who want a senior developer on call without a full-time hire.