Developer-first startups and API platforms building command-line interfaces (CLIs), client SDKs, VS Code extensions, and interactive documentation frequently search to hire a freelance DevTools, CLI (Go Cobra/BubbleTea, Python Typer/Rich, Node.js Commander) & multi-language SDK programmer. I am Aldian Fazrihady, a Senior Freelance Full Stack & Systems Programmer available via Upwork.

Core Developer Tools, CLI & SDK Engineering Capabilities

  • Cross-Platform CLI Binaries (Go Cobra / BubbleTea / GoReleaser & Python Typer): Shipping zero-dependency macOS (Homebrew tap), Linux (`apt`/`rpm`), and Windows (`winget`/`scoop`) CLI binaries with OAuth2 device-code login (`rfc8628`), interactive terminal UIs (TUI), and auto-update checks.
  • Automated Type-Safe Client SDKs (OpenAPI 3.1 / Stainless / Speakeasy / Fern): Generating idiomatic Python (`httpx` sync + async, Pydantic v2), TypeScript (`fetch`, ESM/CJS dual packages), and Go SDKs published automatically to PyPI and npm on every API release.
  • VS Code & JetBrains IDE Extensions: Building Language Server Protocol (LSP) extensions, inline AI code actions, and sidebar webviews.

Frequently Asked Questions

How do you authenticate a developer CLI without asking users to copy-paste API keys?

I implement the OAuth 2.0 Device Authorization Grant (or localhost loopback PKCE callback) so running `yourcli login` opens the browser, authenticates via SSO, and stores tokens securely in the OS Keychain (macOS Keychain / Windows Credential Manager / Linux Secret Service).

How can we hire you as a freelance DevTools & SDK programmer?

Message me on Upwork.

About the Author — Hire Freelance Programmer Aldian Fazrihady

Aldian Fazrihady is a Top-Rated Senior Freelance Programmer, Freelance Full Stack Developer, and AI Application Engineer with 15+ years of production software engineering experience and Google Cloud Professional Cloud Architect & Data Engineer certifications. He specializes in building custom LLM & autonomous AI agents, RAG pipelines, Next.js/React PWAs, Python (Django/FastAPI), Go microservices, and serverless cloud infrastructure on Google Cloud Run and AWS.

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