Pawel Budnik

Led a greenfield marketplace using Python (FastAPI) with AI-driven recommendations; improved p95 latency and sustained 99.95%+ uptime through async optimization and performance budgets. Introduced GraphQL gateway and React Query caching, reducing frontend network calls by 34% and improving time to interactive. Built payments, invoices, and subscriptions with idempotent APIs, reducing charge errors by 41% and lowering customer support tickets. Delivered AI/RAG knowledge search behind secure endpoints; mean time to resolution decreased by ~31%. Implemented OAuth2/JWT with scoped RBAC; external audit passed with 0 high-severity findings. Set up GitHub Actions pipelines with Testcontainers; deployment frequency moved to daily with 97% success. Added OpenTelemetry traces and Grafana/Datadog dashboards; MTTD decreased 55% and MTTR 40%. Optimized Core Web Vitals through code-splitting and image CDN; LCP improved 23% and CLS stabilized. Established API standards (timeouts, pagination, error en

Deployed Python (FastAPI) microservices on Azure App Service with CI/CD pipelines; optimized autoscaling and caching, improving response latency by 28% and cutting cloud spend ~20% through resource tuning. Modernized customer portal to React with SSR where needed; LCP improved 18% and key funnels conversion rose. Built REST/GraphQL services in Spring Boot/NestJS with Redis caching; p95 on hot endpoints dropped 27%. Implemented Kafka event streams and outbox pattern; duplicate processing fell below 0.1%. Launched admin suite in Angular with NgRx; time-to-dashboard decreased 35% and data errors fell. Embedded CI in Jenkins/GitHub Actions; change failure rate reduced from 15% to 7%. Added OpenTelemetry/Prometheus metrics; triage speed improved and SLOs reliably met. Wrote contract tests and Testcontainers setups; integration escapes reduced 33%. Built partner-sync adapters in Python (FastAPI); throughput doubled with typed clients and structured retries. Broke out invoicing into a .NET (C

Built NestJS services and React admin portals; p95 improved 30% and uptime held at 99.9% across three consecutive quarters. Deployed Kafka + CDC for near-real-time sync; data freshness moved from minutes to seconds and reprocessing time dropped 56%. Launched a customer-facing AI/RAG FAQ; ticket deflection improved 23% and satisfaction scores increased 8 points. Implemented OAuth2/JWT with key rotation and scope-based access; 100% of token replay attempts blocked in red-team tests. Established GitHub Actions CI with contract tests; change failure rate decreased from 15% to 7% within two quarters. Migrated key flows to React with accessibility and performance upgrades; LCP improved by 18% and conversion rose 6% on targeted funnels. Ran incident post-mortems and SLO tracking; major incidents per quarter dropped from 6 to 3.