• Backends and APIs. Go and Python services with clean data models, background jobs that survive crashes, and auth and billing (Stripe) that handle money carefully.
• AI features that are dependable and affordable. Streaming chat, structured generation with automatic review, cost metering against plan budgets, and pipelines whose output can be inspected and reproduced.
• Media pipelines. Audio and video processing with ffmpeg, speech-to-text, translation and voice synthesis behind small, swappable provider interfaces.
• Product UI. Server-rendered Go or Next.js interfaces with light and dark themes, built to be fast and clear.
• Systems tools. Small, fast Rust utilities that sit close to the operating system.

Both are commercial products, so their code is private. Each repository below is a public showcase with the product tour, screenshots and an engineering write-up.

Learnix An AI study tutor for Brazilian ENEM students: tutor chat, versioned notes, adaptive practice and flashcards. In development, preview online. Highlights: durable chat turns with a live event stream · exam questions written, then blind-reviewed by a second pass · real-cost usage metering per plan. Go SQLite htmx Stripe

Dubbline AI video dubbing with cloned voices and a transcript-first editor, where you fix single lines and only pay to re-voice what you touched. Highlights: translation with a per-line time budget and a fit loop that never cuts speech · content-addressed take cache · lease-based job queue. Python FastAPI PostgreSQL Next.js ffmpeg

Go Python Rust TypeScript PostgreSQL SQLite FastAPI Next.js htmx Docker ffmpeg Stripe

• Keep the backend modular so any frontend can sit on top of it.
• Make expensive or irreversible operations explicit, quoted before they run, and safe to retry.
• Write down the design: each product above has docs that match the code.
• Ship a working slice first, then harden it with tests and real usage.

Have a project in mind? Email me@bulgaaw.com or message me on X (@LinkyDevv). A short description of what you want built and your timeline is plenty to start with.

More about the work, and how a project with me goes, at bulgaaw.com.