Backend Software Engineer · 4+ years · Node.js & AWS · backends that move millions of events a day without flinching.

I build the unglamorous plumbing that keeps things running: messaging pipelines, caching layers, queues that never lose a job — spirals that loop forever but never collapse. Outside of production code, I cook, I read about systems and psychology, and I'm slowly collecting passport stamps.

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Guni SMS — Senior Backend Engineer (Feb 2022 – present)

• Built a multi-stage AWS Lambda pipeline (SQS, S3, Redis, MongoDB) processing 1M SMS/MMS per hour
• Designed Redis-backed auth caching with Lua scripts + Pub/Sub invalidation — cut MongoDB auth reads by 90%
• Built a multi-provider routing layer with automatic fallback — cut SMS costs 33%, MMS costs 50%
• Led blue-green deployments on AWS ELB for zero-downtime rollouts

FluidFit.ai — Senior Software Engineer, Contract (Dec 2025 – Feb 2026)

• Architected multimodal AI media pipelines across Gemini, Veo, and Imagen with provider fallback
• Shipped image-processing services (Sharp/Jimp) and SVG vectorization tooling end to end

• limitly — distributed rate limiter, 6 frameworks, 4 storage backends, 20K+ req/sec on a single Redis node at p95 < 5ms. npm install limitly
• stl-javascript — core data structures (stacks, queues, segment trees, BSTs) for JS, built for teaching and lightweight production use
• Contributor, OpenFeature.dev — PHP onboarding docs

"From a certain point onward there is no longer any turning back. That is the point that must be reached." — Franz Kafka

Also known as: the point you git push --force and accept your fate.

"I am a cage, in search of a bird." — Franz Kafka

Also known as: a Kubernetes pod, in search of a process that won't crash-loop.

"One morning Gregor Samsa woke to find himself transformed in his bed into a horrible vermin." — Franz Kafka, The Metamorphosis

Also known as: what happens when you wake up to 47 failed CI runs and one very angry on-call alert.

"There are no facts, only interpretations." — Friedrich Nietzsche

Also known as: "It's not a bug, it's a feature" — the original source code comment.

"He who has a why to live can bear almost any how." — Friedrich Nietzsche

Also known as: a clear spec can survive even the worst legacy codebase.

"Whoever fights monsters should see to it that in the process he does not become a monster." — Friedrich Nietzsche

Also known as: whoever fights memory leaks should see to it that they don't introduce three more.

🌀 Every loop here terminates — eventually, probably, citation needed.

Field notes on backend systems — Redis internals, rate limiting tradeoffs, replication, partitioning. Read on Hashnode →

B.Tech, Computer Science & Engineering — Dr. A.P.J. Abdul Kalam Technical University (2018–2022)

📫 dasarpan471@gmail.com · 🐙 github.com/adasarpan404