I build production systems for operationally complex, regulated workflows β fintech to healthcare β where software has to survive real-world mess: documents, permissions, mobile performance, audits, and practical AI behind deterministic, human-reviewed controls.
Now β Founding Engineer (contract) at a medical-travel platform: sole engineer for the React Native patient app, the Next.js coordinator dashboard, and the Node/Prisma/PostgreSQL backend.
Before β 4.5+ years at NayaOne, an FCA-regulated fintech platform serving 80+ financial institutions: Senior Frontend β Senior Full-Stack β Team Lead.
Selected outcomes:
- Killed a GraphQL N+1 on the hot path β 250ms β 75ms for 300+ daily users, every contract byte-identical
- Took an inherited React Native app from a 1.2 GB memory peak with OOM kills to a stable ~350 MB
- Analyzed 35K+ user sessions with an AI pipeline, exposed a 70% onboarding abandonment rate, and led the redesign that cut it below 5%
I treat AI output as evidence to check, never authority β coding agents run under my own design-and-review system, retrieval answers cite or refuse, and medical redlines live in code.
Recent open source: medical-tourism-rag β cite-or-refuse RAG over pgvector, live landing at medtourismatlas.com Β· whisperx-serverless β WhisperX + pyannote meeting transcription on a scale-to-zero GPU, $0 while idle.
Open to senior/staff IC roles β remote, GMT+3 with strong CET overlap.
π egorkravchenko.com Β· π Case studies Β· π CV Β· πΌ LinkedIn