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Hi, I'm
Cezary Choduń
I'm a Senior Software Engineer with +6 years of experience in building backend services at scale.
Professional Journey
Contributing through
Coding
Designing
On Call
Testing
Monitoring
Chacking 😉
Cast AI - Senior Software Engineer
Developed a high-performance database proxy focused on connection pooling, query routing, and integrated caching to improve the scalability and reliability of distributed systems.
Jan 2026
RedStone - Software Engineer
Redesigned and evolved high-throughput backend APIs while building data ingestion pipelines capable of processing large volumes of blockchain data.
Jan 2025
Samsara - Software Engineer II
Optimized backend services running on AWS by improving application performance, scalability, and autoscaling behavior across distributed systems. Collaborated closely with enterprise customers to design backend and algorithmic solutions using Go.
Feb 2024
Google - Software Engineer
Developed playlist analytics features for YouTube Studio, delivering both user-facing functionality and the backend services powering analytics workflows. Utilized Java, Go, TypeScript, and SQL to build APIs, data processing pipelines, monitoring systems, and production-ready analytics infrastructure in collaboration with product, UX, and research teams.
Apr 2022
Avenga & Flairstech - Java Developer (Contractor)
Contributed to enterprise Java applications during a large-scale technology transition, delivering new features while modernizing CI/CD workflows and deployment processes. Built Java backend services, SQL-based data processing solutions, and GDPR-compliant data aggregation pipelines for enterprise customers.
Jun 2021
Syncron - Java Developer
Developed backend integrations between enterprise applications and business intelligence platforms to enable reliable data synchronization and reporting capabilities. Worked primarily with Java and enterprise integration technologies, delivering maintainable production-ready backend services.
Jul 2020
Associate Python Web Developer (Internship)
Developed new functionality for internal web applications while improving database performance and engineering workflows. Utilized Python, JavaScript, SQL, and CI/CD tooling to build backend features and optimize application reliability.
Sep 2019
My Stats
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Merged PRs
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GitHub Stars
Academic Background
Completed two years of a Bachelor’s program in Computer Science at the University of Warsaw, building a strong foundation in algorithms, data structures, software engineering, and computer systems. Chose to leave the program after receiving a compelling software engineering opportunity, transitioning into full-time industry roles and continuing professional development through hands-on experience with large-scale production systems.
Awards & Achievements
2018
Quarterfinalist, Google Code Jam 2018
I reached the quarterfinals of Google Code Jam 2018, Google’s global competitive programming competition focused on solving challenging algorithmic problems under time constraints. I ranked among the top 10% of participants worldwide, demonstrating strong algorithmic problem-solving skills and the ability to perform in a highly competitive international environment.
Top 0
% Worldwide
Mar 2018
Finalist of the Polish Olympiad in Informatics
I was a finalist in the 25th Polish Olympiad in Informatics, one of Poland’s most prestigious programming competitions. The Olympiad focuses on solving challenging algorithmic and computational problems, and I ranked among the top 100 high school competitors in Poland.
Top 0
in Poland
Projects & Open Source Contributions
Personal Project
FreeLLM — Intelligent LLM Gateway for Free-Tier AI
Designed and developed FreeLLM, an open-source proxy that provides seamless access to large language models by intelligently orchestrating requests across the free tiers of multiple AI providers. The system monitors token and request quotas in real time, automatically routing traffic to the least-utilized available model through an OpenAI-compatible API, enabling applications and AI agents to maximize free-tier capacity without hitting rate limits.
How I build
“Creativity is just connecting things. When you ask creative people how they did something, they feel a little guilty because they didn’t really do it, they just saw something. It seemed obvious to them after a while. That’s because they were able to connect experiences they’ve had and synthesize new things.”
