h
hartwell_labs

Bartosz Osiej

@hartwell_labs

Security Infrastructure Engineering Team

Polonia
Polacco, Inglese
Alcune informazioni sono riportate in lingua inglese.
Chi sono
Two-person security team from Poland. We build Rust/eBPF tooling: ransomware detection & response for Linux (~280k events/sec, one static binary, no kernel modules, SIEM sinks, 188 automated tests, CI on every push). Pentests on web + REST API where tenant isolation and RBAC get tested hardest - PL/EN report, reproducible steps, retest included. Open source: github.com/Hartwell-Labs... Continua a leggere

Competenze

h
hartwell_labs
Bartosz Osiej
offline • 
Tempo di risposta medio: 1 ora

Consulta i miei servizi

Gestione delle email
I will audit your email domain spf dmarc and caa and send the exact dns fix
A partire da30 USD / progettoMaggiori dettagli
CI/CD
I will build a ci cd pipeline that runs your tests, scans your code and publishes it
A partire da50 USD / progettoMaggiori dettagli

Portfolio

Esperienza lavorativa

Self_Employed

Founder & Principal Engineer

Self Employed • Lavoratore autonomo

Sep 2026 - Present • 1 mo

Built and shipped 11 open-source products, incl. an eBPF ransomware detection & response agent for Linux: ~280k events/sec, 188 tests, CI on every push. Wrote the company's public research programme (2,000+ domains audited).

Freelance

Freelance Engineer

Freelance • Freelance

Aug 2026 - Present • 2 mos

Security and systems integration work for clients, delivered through escrow contracts with fixed scope and written deliverables. • Web and REST API penetration tests (OWASP ASVS), reports in Polish and English, retest after fixes included • CI/CD pipelines on client VPS: GitHub Actions, deploy keys, health checks, rollback • Marketplace API integrations with automatic order import, idempotent re-runs, retry with backoff • Email deliverability: SPF, DMARC, DKIM, CAA on dedicated sending subdomains