Hey there — I'mKhaja Mujahiddin Mohammed

My name is Khaja, and I love building systems that feel intentional — fast APIs, clean event flows, and AI that stays honest to its sources. With 5+ years across healthcare, payments, and connected vehicles, I work the full backend pipeline: design, implementation, CI/CD, observability, and production ownership.

@app.post("/events")
async def publish(event: Event):
    await producer.send_and_wait(
        "platform.events",
        event.model_dump_json().encode(),
    )
    return {"status": "queued"}

Mission: combine creative systems thinking with a whole lot of polish — experiences that spark trust, not just demos.

Experience

1. Senior Software Engineer - Data Platform

   Optum (UnitedHealth Group) • Hartford, CT • Jul 2025 – Present

   • Owned design and deployment of distributed ETL and microservice platform components using Python, FastAPI, and PySpark on AWS/Azure, improving throughput by 35%.
   • Architected resilient REST APIs and async messaging pipelines with Kafka and SQS, cutting downstream API latency to sub-100ms at peak loads.
   • Implemented rigorous CI/CD workflows using GitHub Actions and Docker, reducing integration bugs by 25% and achieving zero-downtime releases.
   • Established comprehensive logging and observability with CloudWatch and Datadog, decreasing Mean Time to Resolution (MTTR) by 40%.
   • Mentored 4 junior engineers, led weekly code reviews, and enforced SOLID object-oriented standards across cross-functional teams.

2. Software Engineer

   Staples • Chennai, India • Jan 2022 – Jul 2023

   • Re-architected core B2B payment gateway microservices using Java 17, Spring Boot, and PostgreSQL, lifting authorization success from 97% to 99.7%.
   • Optimized relational database queries, indexing strategies, and multi-tier Redis caching, slashing p95 reporting API response times from 800ms to 600ms.
   • Engineered near-real-time data synchronization between MongoDB order datastores and PostgreSQL warehouses across 40+ regional markets.
   • Built robust unit and integration test suites in JUnit and PyTest, maintaining 90%+ code coverage across all production services.
   • Participated in 24/7 on-call rotation for high-throughput transactional services, maintaining 99.9% uptime during Black Friday peaks.

3. Software Engineer

   SRIK Consulting (Client: BMW Group) • Hyderabad, India • Aug 2019 – Dec 2021

   • Developed async vehicle telemetry ingestion services for 50,000+ connected vehicles using Java, gRPC, and Kafka Streams.
   • Designed partitioned PostgreSQL and Redis schemas for 100M+ configuration records, accelerating dealer feature onboarding by 50%.
   • Containerized enterprise legacy monolith into Docker microservices deployed on AWS EKS, increasing release frequency 3x.
   • Constructed backward-compatible gRPC and Protobuf API contracts, reducing cross-team platform integration times from 3 weeks to 5 days.
   • Authored architectural decision records (ADRs), runbooks, and wiki operational documentation for 15+ distributed microservices.

Skills

Education

Certifications

• Oracle Cloud Infrastructure — Multicloud Architect Associate
• Oracle Analytics Cloud (OAC)