Available for senior IC / tech-lead contracts
Systems thatsurviveproduction.
Fullstack developer with 10 years of end-to-end product delivery — from FinTech banking interfaces at Citi to multi-property infrastructure at scale. Strong in React/Next.js, TypeScript, Node.js and AWS, comfortable owning the whole delivery: architecture, API design, CI/CD and production monitoring. Currently focused on production LLM systems — RAG pipelines with hybrid retrieval, evals and enterprise security (RLS, audit trails).
- Role
- Senior fullstack
- Base
- Kraków, PL
- Mode
- Remote
10yrs
End-to-end delivery
≤700ms
p95 RAG retrieval
99.9%
Uptime across 200+ properties
<10ms
Webhook enqueue latency
How I work
MethodI don’t start with the model.
I start with the problem.
The best AI systems are good systems first. I map responsibility boundaries, data paths and the way quality gets measured before any tool gets picked — then make the database, not a convention, enforce the rules.
See the full stack- 01
RAG you can evaluate
Hybrid retrieval, reranking, golden test sets and grounded answers — quality is a number, not a feeling.
- 02
Backends without magic
Rust, Tokio and Axum for the hot path; Python and Node where iteration speed wins. Explicit over clever.
- 03
Security as a contract
Row-Level Security, ACLs, signed webhooks and append-only audit logs — enforced by the database, not by convention.
Selected work
Proof, not claims- 01
Interim Robots
Enterprise RAG · 2026 — Present
An answer is only useful when you can trace where it came from.
- 02
HookSync
Webhook infrastructure · 2025 — Present
Events delivered reliably — even when the receiver refuses to cooperate.
- 03
Tivod
OTT streaming · 2025 — Present
One of the few production attempts at a full-Rust web stack.
Key achievements
Ten years of deliveryEnterprise RAG in production
Built Interim Robots — an enterprise RAG platform for internal procedures: hybrid retrieval (RRF + reranking, p95 ≤ 700 ms), Postgres RLS isolation and an append-only audit log designed for EU AI Act Art. 12.
Edge migration at scale
Architected and delivered a Cloudflare (WAF + CDN) migration for 200+ web properties — 99.9% uptime for a pharmaceutical e-commerce ecosystem handling high-traffic peaks.
Public-sector platform under load
Built and scaled a Django/AWS backend for an EU-funded educational platform serving thousands of concurrent users — designed to absorb load spikes without infrastructure changes.
Streaming, end to end
Developed a PPV video streaming platform (Fightime.tv) from scratch in Rust + Next.js on AWS — ingest pipeline, auth, payment integration and CDN delivery.
Financial analytics SaaS
Engineered VerifyStock.com — real-time data feeds, Stripe billing, Supabase and multi-region AWS deployment.
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