Oleksandr A.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Software Developer | Python · Solidity · Rust · Blockchain I'm a software developer with 15+ years of freelance experience on Upwork. I build and review Python back-ends and tooling, smart contracts in Solidity, and Rust programs, with a focus on blockchain projects where correctness and security matter. What I can help with - Python: automation, APIs, data processing, scripts, and code review. - Smart contracts (Solidity): writing, testing with Foundry, and security-minded review (access control, reentrancy, arithmetic, and gas efficiency). - Rust: on-chain programs, CLI tools, and performance-sensitive components. - Mobile (iOS/Android): since 2011 I've built apps from scratch and updated older ones to current platform versions, in Swift, Objective-C, and Android. - Reviewing AI-generated code: checking it for correctness, performance, and clarity, with feedback that explains the problem and the fix. How I work I write clean, tested, maintainable code and I care about architecture, not just "getting it done". I communicate clearly, flag risks early, and deliver on time. My Master's degree in Economics, Accounting and Audit means I pay close attention to detail and can follow financial logic, which helps in fintech and DeFi projects. If you have a project that needs solid engineering, send me a message with the details and I'll reply with a clear plan and estimate.