Sony Kalladamannil Koshy

Senior Java / Backend Engineer

Designing resilient backend platforms with a product-first mindset.

Mississauga, Canada · Canadian Citizen | TN Visa Eligible (No H-1B Lottery)

Snapshot

9+ years delivering backend systems across retail, payments, and HR tech.

Specializing in Spring Boot, distributed messaging, and service observability.

Trusted partner for mission-critical launches and peak-season stability.

MicroservicesCloudObservability

Availability

Open for freelance backend engineering engagements.

About

Engineering with clarity and ownership.

I help teams ship reliable backend platforms by combining thoughtful system design with hands-on delivery. My focus is on services that stay fast and observable at scale: consistent APIs, well-defined domain boundaries, and automation that supports long-term velocity.

From modernizing monoliths to orchestrating event-driven workflows, I partner closely with product and SRE teams to ensure the backend is a confident foundation for customer experiences.

Skills

Tooling that keeps systems steady.

Java 17 / Spring Boot
Microservices & APIs
Event-driven Architecture
Kafka / RabbitMQ
AWS / GCP
Kubernetes / Docker
PostgreSQL / MongoDB
Observability / SRE

Experience

Built with enterprise scale in mind.

Home Depot Canada

Senior Java / Backend Engineer

2022 - Present
  • Modernized core fulfillment services into domain-focused microservices.
  • Improved checkout reliability with idempotent APIs and circuit breakers.
  • Led incident reviews and performance tuning for peak traffic events.

Tata Consultancy Services (TCS)

Backend Engineer

2019 - 2022
  • Built integration layers for enterprise retail and payments clients.
  • Shipped CI/CD automation that shortened release cycles by 30%.
  • Partnered with QA and product to scale test coverage.

Speridian Technologies

Software Engineer

2016 - 2019
  • Delivered Spring-based services for HR and finance platforms.
  • Owned data migration scripts and backend monitoring dashboards.
  • Mentored junior engineers on clean architecture patterns.

Projects

Focused, high-impact builds.

Voice Conversation Microservice

Real-time backend that orchestrates speech-to-text, intent routing, and response synthesis with sub-second latency.

JavaSpring BootWebSocketsgRPCRedisKafka

Awards

Recognition for reliability and delivery.

Client Excellence Award

Recognized for stabilizing payment processing during seasonal spikes.

Delivery Champion

Led a cross-team migration to containerized workloads ahead of schedule.

Mentor of the Quarter

Supported onboarding and coaching for new backend engineers.

Contact

Freelance inquiries

Let me know what you are building, your timeline, and the outcomes that matter most.