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Software Engineer  /  Salt Lake City  /  40.76° N, 111.89° W

Vasil Vassilev

C# · Java · Python · Rust

I build systems software and break it on purpose: five memory-safety bugs found and fixed upstream in StormLib, an L3Harris-sponsored network-testing platform, and two businesses built from zero. Before that: five World Cups as a competition climber.

Open to software engineering roles · SLC or remote · B.S. May 2026

View work Download resume

Selected work

Security · Systems · Product
Impact AI voice receptionist for dental and legal practices: 24/7 call answering, lead qualification, appointment booking, and confidence-based human escalation.
Stack Retell AI · Twilio · n8n automation into CRM follow-up.
Link ringnest.cloud ↗
Impact Co-discovered five memory-safety bugs in StormLib, reported them upstream, and saw all five fixed by the maintainer.
Stack C++ · AFL++ · AddressSanitizer · OGHarn · GDB crash triage.
Link Read the write-up ↗ Upstream: #383 #384 #385 #386 #387
Impact Extended an open-source network-testing platform for military satellite communications in a five-engineer L3Harris-sponsored capstone.
Stack Rust · Python · TimescaleDB · Grafana · GitLab CI/CD.
Link Sponsor infrastructure, no public repo
Impact Built a cross-platform desktop editor with tokenizer-based syntax highlighting, file-tree navigation, and memory-optimized undo/redo.
Stack Python · PyQt6 · pytest · TDD, with a 1,000+ test suite gating the build.
Link View the code ↗
Impact Built a TCP game server that owns world state, broadcasts JSON updates, and handles concurrent real-time clients.
Stack C# · TCP/IP · multithreading · async I/O · MVC architecture.
Link View the code ↗
Impact Automated a seconds-long parking reservation race with precise final-moment execution, retries, and screenshot verification.
Stack Python · Playwright · real Chrome session automation.
Link View the code ↗
Impact Generates tailored one-page PDF resumes from a master resume and job description, optimized for applicant tracking systems.
Stack Python · Gemini API · LaTeX · Jinja2 content pipeline.
Link View the code ↗

Skills & tools

Languages C# · Java · Python · C++ · SQL · Rust · JavaScript · HTML/CSS
Frameworks FastAPI · React.js · Django · PyQt6 · .NET
Databases MySQL · TimescaleDB
Tools Git · Docker · AWS (Lambda, EC2, S3) · Linux/Unix · GitLab CI/CD · Grafana · n8n · Wireshark
AI & automation Retell AI API · Twilio API · Claude Code · Codex CLI · Amp · Gemini API
Practices OOP · REST APIs · Agile/Scrum · CI/CD · TDD · Database design · Fuzz-testing

Education

May 2026 B.S. in Software Development
University of Utah · 3.8 GPA
Capstone Industry-sponsored by L3Harris Technologies: five-engineer team, military satellite communications tooling.
Founder Two businesses built from zero, including ringnest.cloud.

Before engineering: World Cups

Competition climbing is months of structured preparation for a few minutes of execution, in public, with no second attempt. That is the working style this site's projects came out of.

▲ 5x World Cup competitor for Bulgaria, across multiple disciplines.
▲ Head coach of the University of Utah climbing team (2023), leading the team to a #1 national ranking.
▲ 3x national champion in 1:8-scale RC racing before that. Competing is a habit.
Vasil Vassilev competing for Bulgaria at a World Cup lead climbing event, mountains behind the wall
World Cup lead, Bulgaria #29
Vasil Vassilev leading a traditional climbing route on a granite face
Granite, on the sharp end

Let's build something
that holds.

Actively seeking software engineering roles, Salt Lake City or remote. Email is fastest; the contact form works too.

vvassilev515@gmail.com Contact form