Grzegorz W.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.

Expert-Vetted Software Engineer | 25+ Years of Experience I'm an Expert-Vetted Software Engineer with over 25 years of professional development experience, specializing in Trading Software, Algorithmic Trading Systems, and Embedded Firmware Development. With $100K+ earned on Upwork, 80+ completed jobs, and a 96% Job Success Score, I have a proven track record of delivering reliable, high-quality software solutions. TRADING SOFTWARE & ALGORITHMIC TRADING I develop custom trading applications, indicators, automated strategies, and market analysis tools for retail and professional trading environments. • MetaTrader 4/5 (MQL4/MQL5) - Expert Advisors, custom indicators, automated strategies, risk management tools, and trade management panels. • TradingView (Pine Script v5/v6) - Custom indicators, strategies, alerts, screeners, and webhook integrations. • Python - Trading bots, backtesting frameworks, market scanners, data analysis, and exchange API integrations. • C++ / C# - High-performance trading applications, desktop platforms, market data processing, and API integrations. • Trading APIs - REST, WebSocket, broker/exchange connectivity, and real-time market data. EMBEDDED SYSTEMS & FIRMWARE DEVELOPMENT I also design and develop embedded software for microcontrollers and connected devices, combining low-level programming with practical hardware integration. • ESP32 / ESP32-S3 - Firmware development, Wi-Fi, Bluetooth, interactive applications, and device connectivity. • STM32 - Embedded C/C++, peripheral integration, and microcontroller programming. • Hardware Interfaces - SPI, I2C, UART, GPIO, sensors, and displays. • Development Tools - PlatformIO, Arduino Framework, and embedded debugging. • Embedded UI - TFT displays, graphical interfaces, and resource-efficient applications. CORE TECHNOLOGIES C++, C#, Python, MQL4/MQL5, Pine Script, Embedded C, ESP32, STM32, REST APIs, WebSockets, SQL, Windows/Linux. WHY WORK WITH ME? I bring more than coding skills. My background includes software architecture, complex system integration, debugging, optimization, and long-term development of commercial applications. My hands-on understanding of financial markets, trading strategies, technical analysis, and risk management allows me to approach trading software projects from both a developer's and a trader's perspective. Whether you need a custom trading platform, an automated strategy, a TradingView indicator, or firmware for an embedded device, I can help turn your requirements into a reliable, maintainable solution. Let's discuss your project.