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We take over existing backends and modernize them without stopping delivery.
Most platforms cannot stop shipping while their foundations get fixed. We take over codebases we did not write, map them, then modernize in slices. Our track record here includes moving some twenty services from Node 14 through 18 to 22 and AWS SDK v2 to v3, legacy endpoints moved to serverless, error handling harmonized from opaque 500s to explicit, documented codes, all while the platform kept releasing every sprint.
Services, dependencies, data flows, and where the bodies are buried.
What breaks first, what costs most, what blocks the rest.
Smallest safe steps, each one shipped and verified in production.
Dead code removed, docs updated, your team owning the result.
Yes, that is the normal starting state. Characterization tests go in first, so changes are measured against how the system actually behaves.
Almost always refactor in place. Rewrites stall delivery and rediscover old bugs; slices keep shipping.
That is the default: code review, pairing and shared conventions, so the knowledge stays when the mission ends.
Small reversible steps, feature flags where needed, and observability wired before the risky change, not after.
Tell us what you are working on. Reply within 24 hours, one-page diagnostic within 48.