Available for work

Shantanu Bhusari

I build backends that solve the right problem at the right scale. Go, distributed systems, event-driven microservices — 2+ years in production across platforms that had to handle real traffic. I care about what the product needs to do, and I make sure it can be shipped safely.

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// 06Experience

Freelance Backend Engineer

Leifii MediaJan 2024 – Feb 2026 · Remote, India

–Designed service communication strategy across two e-commerce platforms (15 and 20 services): gRPC for internal latency-sensitive calls, AWS SQS for async event distribution — chosen over Kafka for operational simplicity at this scale.
–Diagnosed Lambda cold start bottleneck (6–9s) caused by Fiber framework overhead (5–10MB) and MongoDB init cost in FaaS context. Documented root cause analysis and migration path to minimal Lambda handlers.
–Built event-driven order state machine: payment_confirmed → delivery_shipped → invoice_generation_queued — explicit event transitions rather than mutable status fields, enabling reliable async fan-out to notifications, inventory, and invoicing services.

Freelance Backend Engineer

Northen AgencyApr 2023 – Jun 2024 · Remote, India

–Delivered 3 production SaaS backends (automotive, fitness, logistics) using Node.js, Express.js, MongoDB — monolithic architecture appropriate for project scale and timeline.
–Built serverless logistics platform on AWS Lambda: sub-10s execution for trip tracking and billing. Single-function deployment pattern (Express wrapped in serverless-http) — later recognised as an anti-pattern and documented in subsequent Lambda work.