Senior Full-Stack Software Engineer

Seeking a senior, part-time Full-Stack Software Engineer / Fractional Technical Lead to take ownership of an existing financial management application. Responsibilities include resolving banking API integration issues, establishing reliable automated daily transaction synchronization, and ensuring production security, accuracy, and stability. The role also involves overseeing development of a local AI-agent operating system, reviewing AI-generated code, and managing ongoing technical improvements. Approximately 5–10 hours weekly, with long-term potential.