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Osvaldo Calles
Senior Software Engineer specializing in developer tools, cloud automation, and generative AI
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Built and deployed a production chatbot on osvaldocalles.com and iterated through real-world LLM engineering issues: model quota/cost tradeoffs (migrating to Nova Pro), RAG accuracy via semantic chunking, AWS IAM/guardrail/security pitfalls, and Lambda/API Gateway streaming constraints (prefers JS for streaming layer). Experienced with agent orchestration using Strands SDK (AWS-focused) and LangGraph (Vercel/container deployments), plus evaluation pipelines using LLM-as-evaluator, dashboards, and staged model rollouts.
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Key Strengths
- Deployed an LLM chatbot to production (osvaldocalles.com)
- Pragmatic model selection balancing quota limits, cost, and reasoning capability (switched to Nova Pro)
- Hands-on RAG quality improvement via semantic chunking
- AWS deployment troubleshooting across IAM, guardrails, and tool permissions
- Designed iterative agent evaluation approach (LLM-as-evaluator, dashboards, user feedback loops, model comparison and staged rollout)
- Orchestration framework experience (Strands SDK for AWS; LangGraph for Vercel/containers)
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