Jerin Joseph

A multi-tenant membership platform for AICPA and CIMA, serving 600K+ members. The architecture is a hybrid — microservices, event-driven messaging, and deep integrations with third-party SaaS services covering CRM, CMS, billing, product management, and authentication. The kind of system where understanding how everything connects matters as much as writing the code.

• ▸Architected and delivered high-impact features for a multi-tenant membership platform (AICPA/CIMA) serving 600K+ members, built on a serverless, event-driven microservices architecture with React and GraphQL.
• ▸Drove end-to-end performance optimization of backend APIs, reducing load latency by 93% through profiling, async workflow redesign, API batching, and overfetching reduction.
• ▸Modernized testing strategy by introducing Vitest, achieving 50% faster unit tests and improving development feedback loops across CI/CD pipelines.
• ▸Led proof-of-concept adoption of AI-assisted development (Claude Code), defining shared context architecture, configuration standards, and team workflows.
• ▸Owned root cause investigation of complex cross-system production incidents impacting payments and subscription workflows.
• ▸Mentored engineers through onboarding documentation, data-flow diagrams, pair-programming sessions, and knowledge-sharing workshops.

Two years in the transportation industry, spanning both product engineering and embedded systems — full-stack work on React frontends and Java APIs, alongside real-time software for onboard computers and event recorders operating under strict reliability constraints.

• ▸Delivered full-stack enhancements across React frontends and Java/Spring Boot REST APIs, improving platform stability and security.
• ▸Redesigned a high-traffic application dashboard with client-side processing, memoization, virtualization, and lazy loading — reducing load times by 45%.
• ▸Automated build and deployment workflows with a Bash-based tooling solution, saving more than 15 minutes per build cycle.
• ▸Enhanced and maintained real-time software modules for locomotive onboard computer and event recorder systems under strict reliability constraints.

A large-scale warehouse management system built on Java, PL/SQL, and Oracle DB, supporting 8 geographically distributed U.S. locations. High-volume and mission-critical — the kind of environment where careful root cause analysis matters more than moving fast.

• ▸Managed a large-scale warehouse management system built on Java, PL/SQL, and Oracle DB, supporting 8 geographically distributed U.S. locations.
• ▸Diagnosed and resolved production issues via root cause analysis, reducing recurring incidents and support tickets by 25%. Recognised with the Infosys Insta Award.
• ▸Revamped an internal IBM MQ message reprocessing tool, adding multi-queue support and Excel-based data ingestion for automated re-queuing.