Event-driven backends
Design and implementation of resilient services ready for scale.
- CQRS/ES aggregates, projections, and event stores
- Async execution with Tokio and Postgres
- Monitoring, logging, and rollback-friendly deployment
Grzegorz Aleksander Klementowski
Rust Systems Engineer
I help founders and engineering leaders ship production-grade Rust services, automate critical workflows, and unblock data flows that must never fail.
Every engagement starts with a measurable goal: increase throughput, reduce defects, or unlock a new product capability. I combine Rust expertise with a systems engineering mindset to move those numbers quickly.
Design and implementation of resilient services ready for scale.
Rust-powered CLI tools that remove manual work and enforce quality.
Bridging Rust services with SQL, analytics, and reporting pipelines.
Lean delivery process aligned with your roadmap.
Delivered an inventory core where every movement is event-sourced and auditable. Implemented aggregates, domain commands, and async projections to keep stock levels trustworthy even under heavy load.
Built a suite of production-style binaries solving complex data puzzles. Reinforced habits around parsing, graph processing, and simulation under test discipline that translates directly to client work.
do()/don't())Crafted CLI utilities that replace brittle scripting with typed, testable Rust code: grade calculators, Lotto simulator with UX polish, and system admin helpers for Linux teams.
std::process::Command
Deployed a collection of reliability-first utilities: swap management wrappers, ANSI color tooling, VCF generators, and pricing calculators with clear reporting.
Documented mastery of Rust fundamentals through extended book exercises. Every chapter includes original code, tests, and automated pipelines to ensure production hygiene.
Ongoing exploration of decentralized information systems in Rust. Focused on fault tolerance, predictable delivery, and lean code free of unnecessary dependencies.
We map desired business outcomes, technical constraints, and success metrics. Expect direct questions and a clear statement of work within two business days.
High-level architecture, risk analysis, and a scoped proof of concept. Stakeholders receive code walkthroughs and performance benchmarks before full build-out.
Weekly increments with CI in place from day one. You get automated reports, test coverage updates, and access to repositories, dashboards, and documentation.
Final hardening, observability setup, and production rollout. I handle knowledge transfer and remain available for iterative improvements or extended support.