Backend and platform engineer with 14+ years building distributed systems, APIs, and business-critical backend software.

Strongest in Java/Spring, event-driven systems, SQL/PostgreSQL, and turning ambiguous requirements into production systems that stay understandable under load. Recent public work focuses on AI-native tooling, multi-model orchestration, developer workflow automation, and practical software that solves real operational problems.

48-component AI platform built solo — takes a WhatsApp voice note and turns it into a tested pull request. Cross-LLM verification where no model evaluates its own output, 14 AI models across 5 providers, 100% branch coverage as a CI gate, and 27 verification scripts enforcing quality at every stage.

Smart routing proxy for Claude Code that preserves premium reasoning capacity and controls cost by delegating execution-heavy work to other models when it is safe to do so.

Chrome extension plus backend for extracting, tracking, and analyzing car listing data over time. A practical product with browser automation, AI-assisted extraction, and cloud deployment.

Chrome extension that adds the one filter GitHub was too afraid to ship: hide the tests. One click and the diff shrinks 32-34%*. Built entirely by a frontier LLM. Methodology: vibes.

Small but useful browser extension that turns Rancher's unreadable JSON logs into a filterable log viewer people can actually use.

Most of the production-scale work behind my profile comes from backend and platform roles across startups, scale-ups, and enterprise teams:

• built a 48-component AI platform with 400K+ lines of TypeScript, cross-LLM verification, and 100% branch coverage
• owned billing-critical backend systems on workloads around 100M events per day, including usage aggregation across 100 processing nodes
• currently build secure external APIs in a 35+ microservice platform, including OAuth2 security, contract-first design, and resilient integrations
• handled a zero-downtime migration of 10M+ records and built an event-driven workflow engine that became a platform foundation for third-party vendors
• worked on backend systems for remote monitoring and incident handling across 100,000+ vehicles and motorbikes
• moved into technical team leadership, led a 7-10 person team, and technically screened 50+ candidates during a major hiring phase
• built a Salesforce-integrated renewal workflow that saved work equivalent to 2 full-time roles

Java, Spring Boot, Spring WebFlux, TypeScript, Node.js, Python, PostgreSQL, MySQL, Redis, Kafka, Docker, Kubernetes, Terraform, AWS, GCP, Azure.

• clear contracts and explicit failure handling
• CI/CD, observability, and production ownership
• pragmatic architecture over theory-first debates
• AI as leverage, not as a replacement for engineering judgment

• Email: [email protected]
• LinkedIn: linkedin.com/in/piotrbuchman

Less noise, more signal.