jaghall

Senior full-stack engineer based in Costa Rica, seeking a founding or early-stage startup role with real LLM work; open to contract or a paid trial and does not need sponsorship.

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Remote Costa Rica contract senior

Skills

JavaSpring BootAngularTypeScriptAzure SQLAzure Entra IDAzure OpenAILLM structured outputsLLM validationClaude CodeMCPagent pipelinesReactNext.js

Domains

backend frontend cloud AI/LLM startup SaaS M&A integration

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Location: Costa Rica (UTC-6)
Remote: Yes (also open to hybrid in Costa Rica's Central Valley)
Willing to relocate: US citizen based in Costa Rica
Technologies: Java/Spring Boot, Angular/TypeScript, Azure (SQL, Entra ID, OpenAI), LLM features (structured outputs, validation), Claude Code + MCP agent pipelines; some React/Next.js
Résumé/CV: https://www.linkedin.com/in/jagdishhall
Email: [email protected]
GitHub: github.com/wabbajag
Prompt rules alone had GPT-4o inventing IDs to satisfy them. Moving them into a strict response schema got 8 of 10 structural checks passing. The feature is still in build.
Sole engineer since early 2025 on a pre-revenue M&A integration SaaS, after 6 months paired with a senior engineer.
Looking for a founding or early engineer role at a funded pre-seed to Series A startup with real LLM work. No sponsorship needed, full US-hours overlap. Contractor is fine. Open to a paid 4-week build as a trial.

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