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Andrej A.
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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.

🇨🇿Prague, Czech Republic$150/hr100% JSS5.00 (3)Since May 2026

Earnings and projects

MRR
$2.2k

Last 6 months ÷ 5 months active (since Jun 2026)

World#20,390 / 412k
🇨🇿Country#32 / 669
Revenue, last 30 days
$553

Last 6 months: $11k

World#60,236 / 412k
🇨🇿Country#65 / 669
Total earnings
$11k

Billed in all: $11k

World#189,419 / 412k
🇨🇿Country#327 / 669
Per project
$2.2k

$2.2k in the last 6 months

World#72,249 / 412k
🇨🇿Country#135 / 669
Projects, last 6 months
5
100% fixed0% hourly
World#41,746 / 412k
🇨🇿Country#52 / 669
Projects in all
5
100% fixed0% hourly
World#266,044 / 412k
🇨🇿Country#480 / 669

Earnings, last 30 days

$10.9k+$553 earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$10.0k$10.5k$11.0kOct 9Oct 24Nov 8

Skill rankings: Top 6% in ChatGPT

Ranked by MRR among everyone on Upwork with the skill.

  1. #4pytest64 freelancers · 🇨🇿 #1Top 6%
  2. #13Code Refactoring118 freelancers · 🇨🇿 #1Top 11%
  3. #19Test-Driven Development172 freelancers · 🇨🇿 #1Top 11%
  4. #20Code Review218 freelancers · 🇨🇿 #1Top 9%
  5. #23AI Code Generator269 freelancers · 🇨🇿 #1Top 9%
  6. #37Test Automation445 freelancers · 🇨🇿 #1Top 8%
  7. #68FinTech802 freelancers · 🇨🇿 #1Top 8%
  8. #121Software Architecture964 freelancers · 🇨🇿 #1Top 13%