David V.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.

I specialize in distributed systems programming, bringing over 22 years of expertise to the table. My journey began with Golang and Bitcoin, leading me to master low-level programming across networks, databases, and peer-to-peer networking. I excel in crafting original algorithms, including hash functions and fast state machine encoders. My proficiency extends to UDP real-time multicast networking, cryptography, and a variety of APIs such as IPC and OpenAPI. I have a strong background in blockchain development, having built advanced systems for notable projects and developed a matchmaking server for a gamer social network. If you're seeking a seasoned back-end developer who can tackle complex challenges and deliver innovative solutions, let’s connect. I look forward to contributing to your project.