Resume
Sanjay Santhanam
Backend & Systems Engineer
Profile
Backend and systems engineer with 4+ years of experience building reliable healthcare and financial platforms. Specialized in Java, Spring Boot, distributed services, event-driven processing, and product delivery across the stack.
Experience
Software Developer
Johnson & Johnson
Jun 2024 - Present
New Brunswick, New Jersey, United States · Hybrid
Architected a FHIR-compliant microservice using Java 17 and Spring Boot to streamline patient appointment scheduling across 15 hospitals, reducing average booking time by 35% and supporting 24/7 availability.
Java 17 / Spring Boot / FHIR / Microservices / React.js / API Gateway
Software Developer
Citi
May 2023 - Apr 2024
New York, United States · Remote
Built Spring Boot microservices for real-time credit card fraud checks using Kafka Streams and Oracle, supporting over 1M transactions per hour while improving detection accuracy by 15%.
Spring Boot / Kafka Streams / Oracle / Docker / REST APIs / Java 17
Software Development Engineer
Zentek Infosoft
Jun 2020 - Jul 2022
Jaipur, Rajasthan, India · Remote
Delivered a role-based enterprise HR portal using Java, Spring Boot, Angular, and MySQL, streamlining onboarding workflows and reducing manual HR processing time by 40%.
Java / Spring Boot / Angular / MySQL / AWS / REST APIs
Selected projects
FHIR Patient Scheduling
Designed a FHIR-compliant scheduling microservice in Java 17 and Spring Boot, connecting appointment workflows across a multi-hospital network while keeping booking available around the clock.
15 hospitals connected · 35% faster booking · 24/7 availability
Java 17 / Spring Boot / FHIR / Microservices
Real-Time Fraud Detection
Built Spring Boot services around Kafka Streams and Oracle to score credit-card activity in real time, balancing sustained throughput with higher detection accuracy.
1M+ transactions per hour · 15% accuracy improvement
Spring Boot / Kafka Streams / Oracle / Docker
Enterprise HR Portal
Delivered a role-based HR platform spanning Spring Boot, Angular, and MySQL to consolidate onboarding workflows and remove repetitive manual processing.
40% less manual processing
Java / Spring Boot / Angular / MySQL
Flight Delay Prediction
Trained an XGBoost arrival-delay model on the OpenFlights dataset and mapped cascading delays with operational visualizations for schedule planning.
94% prediction accuracy
Python / Scikit-learn / XGBoost / Matplotlib
CloudKey Authentication Service
Built a cloud authentication service with Firebase Auth, Google OAuth, API-key controls, and coordinated React and Node.js flows for safer, faster access.
30% faster login flow · 20% fewer access errors
Firebase Auth / Google OAuth / React / Node.js
A cross-platform, fully offline PDF workstation with native document tooling, on-device AI, a plugin SDK, and a self-hostable server. No uploads, accounts, cloud round-trips, or telemetry.
30+ PDF operations · 730+ Rust tests · 3 desktop platforms
Rust / Tauri / Svelte 5 / TypeScript
Skills
Languages: Java, TypeScript, JavaScript, Python, C/C++
Backend & Data: Spring Boot, Node.js, PostgreSQL, Kafka, Redis
Frontend: React, Angular, Next.js, Tailwind CSS, WebGL
Cloud & Delivery: AWS, Docker, Kubernetes, Terraform, Jenkins
Education
Master of Science in Computer Science
Syracuse University · Syracuse, NY
Bachelor of Engineering in Computer Science and Engineering
Anna University · Chennai, India
Research
4 publications and 40+ citations in computer vision and deep learning.