Colby Baker
Software engineer at CVS Health: backend APIs and LLM systems for healthcare. On my own time I ship products end to end, like Aspicio.
- Java
- Python
- TypeScript
- Spring Boot
- FastAPI
- React
- LangGraph
- GraphQL
- PostgreSQL
- Kubernetes
- ≈16.5 sfaster welcome turn in CVS's AI health assistant, measured end to end
- 92.1%lab-question recall in the assistant, up from 84.3%
- 58%faster scheduling test suite, 5m33s to 2m22s
- 427merged PRs and 402 code reviews at CVS Health
May 2026 – present · CVS Health · internal work
Health Agent AI Team
The patient-facing AI health assistant in CVS Health's consumer health app. I built its debugging platform, improved answer accuracy and speed, and built the evaluation that gated new designs.
- 92.1%lab-question recall, up from 84.3%, measured on 554 real lab panels
- ≈16.5 sfaster welcome turn, measured end to end
- 30–40%of the team adopted my debugging platform without a formal rollout
- 64%blinded reviewer preference for specialist answers (p = 0.0083)
- Python
- LangGraph
- FastAPI
- React
- Multi-agent routing
- Offline evaluation
- Guardrails
- TypeScript
- SQLite
- Splunk
- OpenTelemetry
- Structured logging
- Envelope encryption
- PHI/PII redaction
Jun 2024 – May 2026 · CVS Health · internal work
API Scheduling Team
APIs and data flows behind appointment scheduling for CVS Health's in-person and virtual care. I also owned releases and built the team's tracing, test speedups and an LLM triage bot.
- 58%faster full test suite (5m33s → 2m22s); one group 185 s → 6 s
- 19 morelease owner; 11 services shipped to UAT in one day with my automation
- 1.6%lost trace correlation found and fixed in a 16.5k-event audit
- 17scheduling repositories cleared of dependency vulnerabilities
- Java
- Spring Boot
- GraphQL
- Cassandra
- REST
- MySQL
- GitHub Actions
- Harness
- Snyk
- OpenTelemetry
- Splunk
- Structured logging
- Python
- LLM routing
- Slack API
May – August 2023 · CVS Health · internal work
Digital Engineering Intern
My first engineering role, on CVS Health's API development team, working within enterprise API standards and processes.
- Self-servemetrics and exports for leadership, replacing manual requests to developers
- React
- TypeScript
- MySQL
- Apigee
- Chakra UI
- SwaggerHub
- Apigee Edge
- Jenkins
- Splunk
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Projects
-
October 2026
Spotify Classic Lyrics
A one-click desktop fix that puts Spotify's lyrics back beside your library and playback controls, on Windows and macOS.
- Electron
- Node.js
- GitHub Actions
-
July 2026
Aspicio
An astrology platform with interactive birth charts, a 3D sky and relocation maps. Its positions match NASA JPL Horizons to within 0.0005″ in every cell of a 1,250-cell test grid.
- Next.js
- TypeScript
- Three.js
- Supabase
-
December 2024
Music Search App
A Java tool that walks the folders you choose, reads every MP3's ID3v1 and ID3v2 tags, and indexes the songs by title and artist.
- Java
- Maven
- mp3agic
-
June 2022
OpenAI Chatbot
A chat interface on OpenAI's text-davinci-002 completion model, built five months before ChatGPT launched.
- Vue 3
- Vite
- OpenAI API
School projects (2021–2024): ProShop course project · React, Redux, Node.js Library Database API · Node.js, Express, PostgreSQL Weather Database · Node.js, Express, PostgreSQL Summoner Spell Generator · Node.js, Express, EJS
Experience
-
May 2026 – present
Health Agent AI Team, CVS Health
The patient-facing AI health assistant
- Python
- LangGraph
- FastAPI
- React
- Multi-agent routing
- Offline evaluation
- Guardrails
- TypeScript
- SQLite
- Splunk
- OpenTelemetry
- Structured logging
- Envelope encryption
- PHI/PII redaction
-
Jun 2024 – May 2026
API Scheduling Team, CVS Health
Appointment APIs for in-person and virtual care
- Java
- Spring Boot
- GraphQL
- Cassandra
- REST
- MySQL
- GitHub Actions
- Harness
- Snyk
- OpenTelemetry
- Splunk
- Structured logging
- Python
- LLM routing
- Slack API
-
May – August 2023
Digital Engineering Intern, CVS Health
First enterprise engineering role
- React
- TypeScript
- MySQL
- Apigee
- Chakra UI
- SwaggerHub
- Apigee Edge
- Jenkins
- Splunk
Skills
- Languages and frameworks
- JavaPythonTypeScriptJavaScriptSQLSpring BootFastAPIReactNext.jsNode.jsLangGraphRESTGraphQL
- AI systems
- LLM applicationsMulti-agent routingOffline evaluationGuardrailsPrompt design
- Infrastructure and delivery
- KubernetesDockerGitHub ActionsHarnessArgo CDSnykVercel
- Data and observability
- PostgreSQLMySQLCassandraRedisSplunkOpenTelemetry