Juan Vistro
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Résumé

Juan Vistro

Principal Software Engineer — Architecture, AI & Full-Stack Systems

Montpelier, VT · +1 857-389-2965 · JPMBVistro@gmail.com

Professional summary

Hands-on engineering leader with 9+ years of experience building and operating full-stack products, cloud platforms, and AI-enabled systems. Led shared AI platform capabilities and technical modernization across multiple engineering teams at Moderna, combining architecture, production delivery, AWS operations, regulated-industry collaboration, design reviews, junior/intern mentoring, and cross-functional alignment. Deep experience across React/TypeScript, Python/FastAPI, C#, REST APIs, distributed systems, CI/CD, RAG, agentic workflows, and AI observability. Brings product-minded technical strategy, executive-stakeholder partnership, and calm ownership from early exploration through production support.

Technical skills

AI & agentic systems

AI platforms, multi-agent orchestration, tool interfaces/tool calling, RAG, embeddings, pgvector/vector search, evaluation harnesses, Langfuse/LLM observability, model routing, prompt/context assembly

Full-stack & APIs

React, Next.js, TypeScript, Node.js/NestJS, Python/FastAPI, C#, REST APIs, SQL, data modeling, background jobs, queues, rate limiting

Cloud & delivery

AWS (EC2, ECS, ECR, S3, CloudWatch), Docker, GitHub Actions, CI/CD, observability, production operations, on-call, incident response

Technical leadership

Architecture, design reviews, engineering standards, cross-team planning and alignment, junior/intern mentoring, hiring evaluation, stakeholder communication, product/design partnership

Experience

Software Engineer / Cross-Department UX Lead | Moderna

July 2023–September 2026

  • Led shared production AI platform capabilities and developer workflows used by 100+ engineers from technical design through implementation, evaluation, deployment, adoption, and support.
  • Architected TypeScript/Node.js multi-agent workflows coordinating planning, implementation, validation, review, remediation, and human approval through reusable tool interfaces.
  • Established AI evaluation, privacy, testing, approval, retry, model-routing, cost-control, audit, and Langfuse observability patterns for production workflows.
  • Built, deployed, and operated a production FastAPI proxy on AWS for migration validation across 12+ legacy services using ECS, ECR, EC2, S3, CloudWatch, queues, SQL, and rate limiting.
  • Led technical modernization across 12 engineering teams and three verticals, coordinating dependencies, shared implementation patterns, and adoption across engineering and product.
  • Led formal technical design reviews, surfaced implementation and integration risks, and drove architectural decisions before development.
  • Mentored junior and intern engineers from proof of concept through production and supported delivery continuity during a management transition.
  • Owned production reliability and operational decisions for assigned product areas, including on-call, incidents, SLOs, capacity, and load considerations, while partnering with product and design.
  • Worked in Moderna's regulated-industry environment, collaborating with research scientists and GxP teams on development-side capture and automation workflows.

Founder / AI Platform Engineer | Private Health-Adjacent Product

January 2026–Present (part-time)

  • Personally built and own product engineering for a confidential Next.js/React and TypeScript application, including role-based authorization, privacy controls, data modeling, deployment, discovery, and user testing; reached MVP in approximately two months and production approximately two months later.
  • Designed a TypeScript/Node.js multi-agent delivery system with deterministic orchestration, durable artifacts, reviewer/remediation cycles, approval gates, risk controls, and PR handoff.
  • Built RAG-backed document search with embeddings, pgvector, retrieval ranking, context assembly, source attribution, and freshness indicators.
  • Implemented model routing, retry limits, context caching, repetition budgets, and cost aggregation to balance reliability, latency, and AI spend.

CTO & Co-Founder | Impact Innovations

April 2023–Present (part-time)

  • Own technology strategy, solution architecture, and technical roadmaps for nonprofit and social-impact clients, translating ambiguous needs into platform decisions, integrations, automations, and data workflows.
  • Own the engagement's technology platform, including GitHub Actions, build/deployment and observability tooling, internal APIs, query optimization, and Supabase infrastructure-as-code.
  • Partner with organizational and executive leaders on discovery, vendor evaluation, solution scoping, implementation planning, architecture, data quality, risk, and business outcomes.

Software Engineer | DraftKings Inc.

July 2021–January 2023

  • Built customer-facing applications and key workflows using React, TypeScript, C#/.NET, HTML, and CSS.
  • Partnered with product, design, backend, and engineering stakeholders from technical planning through implementation, review, and production launch.
  • Owned production reliability and operational decisions for assigned product areas, including on-call and incident response.

Software Engineer | Resilient Coders

January 2021–June 2021

  • Built mobile-first MERN applications with mapping, Twilio integration, and custom client-facing interfaces.

Freelance Software Engineer | Freelance

April 2017–June 2021

  • Delivered frontend and full-stack web applications for independent clients using React, TypeScript, Node.js, Next.js, WordPress, and AWS, including UI implementation, APIs, testing, and Git-based delivery.

Certifications

Quadrant Three Leadership Coach — Concord Leadership Group