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Joseph Chagnon

@josephchagnon

Message

Senior software engineer building full-stack, cloud-native and AI/LLM products that improve performance and engagement.

United States

Message

What I'm looking for

I’m looking to lead end-to-end delivery of AI-enabled, high-scale products—owning RAG/agent workflows, APIs, and observability—within a team that values reliability, performance, and collaborative engineering.

I’m a Senior Software Engineer with 11 years building full-stack, cloud-native and AI-focused products across healthcare, enterprise software, and eCommerce. I specialize in React/TypeScript, Node.js, Python, GraphQL, PostgreSQL, and production LLM systems—RAG pipelines, semantic/vector search, agents, and recommendation workflows.

Across teams at Highmark Health, Walmart, and IBM, I’ve engineered distributed, event-driven microservices with Kafka, Docker/Kubernetes, Redis, and observability to improve reliability and frontend performance by 40%. I deliver measurable outcomes—like 34% higher member engagement and 42% lower API latency—and I prioritize secure authentication and HIPAA-aligned access using OAuth2/OpenID Connect/Auth0 and Azure KeyVault, while mentoring engineers through reviews and production debugging.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Highmark Health

Sep 2022 - Present (3 years 9 months)

Led engineering for CareConnect and CareMatchAI features used by 3M+ members, increasing member engagement by 34%. Built semantic search and agentic workflow automation, and reduced API response latency by 42% through caching, SQL optimization, and performance tuning.

React TypeScript GraphQL PostgreSQL Semantic Search Caching Kafka

Senior Software Engineer

Walmart

Jun 2017 - Aug 2022 (5 years 2 months)

Built and scaled eCommerce and SmartSuggest capabilities across shopping, checkout, and fulfillment workflows at high transaction volume. Improved frontend performance by 40% via React/Next.js modernization and implemented recommendation and experimentation capabilities to enhance product discovery.

React Next.js TypeScript GraphQL PostgreSQL Redis Kubernetes Kafka Recommendation Systems A B Testing

Full Stack Engineer

IBM

Jun 2015 - May 2017 (1 year 11 months)

Developed features for an Enterprise Integration Application Suite, building reusable React components and GraphQL/REST APIs for enterprise clients. Standardized delivery by introducing Docker-based development environments and automated CI/CD pipelines, supporting maintainable, test-driven Agile delivery.