Andrej A.
AI & Software Engineer | I build, fix & test: agents, automations, API
I build and fix software that ships - with tests, not promises. You get working, reviewed, merge-ready code from one engineer accountable for the result. What I do: - Build & fix AI features - LLM agents, RAG pipelines, Claude/OpenAI integrations, MCP servers. - Automations & integrations - APIs, webhooks, data pipelines, browser automation/scraping. - Code review, bug-fixes & test coverage - I find the root cause, fix it, and prove it with tests. How I work: AI-assisted for speed, but I personally own the architecture, review and tests - clean code that fits your repo's conventions, passes CI and lints clean, not a raw AI dump. 10+ years architecting software (fintech/payments: data models, state machines, integrations). Fully async and written - one person accountable, no hand-offs. I work straight from your spec or a reproducible issue with minimal back-and-forth. Recent open-source sample: a 14-test PR adding characterisation tests to a complex orchestration class (full suite green) - see my portfolio below.
Earnings and projects
Last 6 months ÷ 5 months active (since Jun 2026)
Last 6 months: $11k
Billed in all: $10,898$11k
$2.2k in the last 6 months
Earnings, last 30 days
Skill rankings: Top 6% in ChatGPT
Ranked by MRR among everyone on Upwork with the skill.
- #4pytest64 freelancers · 🇨🇿 #1Top 6%🇨🇿#1 of 1
- #13Code Refactoring118 freelancers · 🇨🇿 #1Top 11%🇨🇿#1 of 1
- #19Test-Driven Development172 freelancers · 🇨🇿 #1Top 11%🇨🇿#1 of 1
- #20Code Review218 freelancers · 🇨🇿 #1Top 9%🇨🇿#1 of 2
- #23AI Code Generator269 freelancers · 🇨🇿 #1Top 9%🇨🇿#1 of 1
- #37Test Automation445 freelancers · 🇨🇿 #1Top 8%🇨🇿#1 of 3
- #68FinTech802 freelancers · 🇨🇿 #1Top 8%🇨🇿#1 of 5
- #121Software Architecture964 freelancers · 🇨🇿 #1Top 13%🇨🇿#1 of 3