Unfurling manuscript…

Arpan Das — pencil sketch portrait

The Architect of Spirals

Arpan Das

"From Kafka's beetle to Nietzsche's hammer — I architect spirals that never break."

Kafka Metamorphosis sketch — beetle transforming into Lambda Backend Software Engineer · 4+ Years · Node.js & AWS · Millions of Events Daily

The Architect of Spirals — hand-drawn illustration of a cyber-Kafka figure cooking code in a wok
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Journal Entry

§ On building backends like soya aloo stir-fry

Backend Software Engineer with 4+ years building high-throughput distributed systems using Node.js and AWS. Like a perfect soya aloo stir-fry — balanced, spicy under pressure, and nourishing millions — I architect backends that handle millions of events daily without breaking a sweat (or the budget).

Experienced in event-driven architectures, caching systems, asynchronous processing, and large-scale messaging platforms. Strong focus on system reliability, performance optimization, and scalable backend infrastructure — from Lambda pipelines processing 1M SMS/hour to Redis Lua scripts cutting auth reads by 90%.

"I have declared war on flaky deploys. What does not kill my pipeline makes it stronger."
— Nietzsche, if he were a DevOps engineer

Between commits, I cook soulful meals and publish open-source tools like Limitly. Code and kitchen: both demand patience, heat management, blue-green rollouts, and the courage to taste before you serve.

Hand-sketched Kafka Metamorphosis — beetle morphing into a Lambda function

Die Verwandlung · Ch. 1

"I awoke one morning from uneasy dreams and found myself transformed in my bed into a Senior Backend Engineer."

Not Gregor Samsa's beetle — a production-hardened Lambda with opinions about SQS backpressure, Redis Lua scripts, and why your queue should spiral like Uzumaki but never actually break.

Uzumaki spiral icon — infinite queue motif

Uzumaki · Redis queues

Uzumaki spiral cluster — distributed systems motif

Eternal loops · Bull jobs

Metamorphosis beetle to Lambda transformation icon

Metamorphosis · Junior → Architect

The Pantry

Every great feast starts with well-stocked staples

🌶️

Base Spices

Languages

JavaScript, TypeScript — the sturdy rice base of every distributed dish.

🍳

The Wok

Backend Technologies

Node.js, Express.js, Fastify, REST APIs, WebSockets, Microservices, Authentication & Authorization, API Design.

🍽️

Plating Station

Frontend Technologies

React.js, HTML5, CSS3, Tailwind CSS, Material UI, Redux Toolkit, Context API, React Query, Responsive UI.

🥒

Quick Pickle Burst

Databases & Caching

MongoDB, Redis, Elasticsearch, Redis Lua Scripts, Cache-Aside Pattern, Distributed Caching.

🔥

The Fire

Cloud & DevOps

AWS (Lambda, ECS, Fargate, EC2, SQS, S3, CloudWatch, ELB), Docker, Kubernetes, Git, GitHub Actions, GitLab CI/CD, Linux.

📨

The Conveyor Belt

Messaging & Distributed Systems

Bull Queue, Redis Pub/Sub, MongoDB Change Streams, Event-Driven Architecture, Queue-Based Systems, Provider Routing.

🛡️

The Thermometer

Monitoring & Reliability

AWS CloudWatch, Logging, Fault-Tolerant Systems, Retry Mechanisms, Blue-Green Deployment, Performance Optimization.

🧪

Fusion Blends

AI & Integrations

Google Gemini API, RAG, Vector Search, Embedding Models, Recraft Vectorize, Recraft V3 SVG, Zoho Extension SDK, Stripe SDK.

🔧

Side Tools

Other

Socket.IO, Postman — the tasting spoons and thermometers of API craftsmanship.

The Kitchen Logs

Dashed pencil lines connecting every role

Uzumaki spiral — timeline motif

Guni SMS

Senior Backend Engineer
Feb 2022 – Present

Messaging Platform · 1M SMS/MMS per hour (278 msg/sec sustained)

Engineered and scaled backend infrastructure for a high-throughput messaging platform — asynchronous processing, provider routing, and real-time communication workflows.

Click to unfold the full kitchen log →

  • Architected a multi-stage AWS Lambda bulk messaging pipeline (L1→L2→L3) using SQS, S3, Redis, and MongoDB to process 1M SMS/MMS messages per hour, with provider batching reducing outbound HTTP requests by 99% and Redis DLR caching enabling high-speed inbound reply correlation.
  • Engineered scalable multi-provider SMS reply processing pipelines using AWS Lambda, SQS, Redis, and MongoDB, processing 100k+ MO messages/day with provider-agnostic webhook orchestration.
  • Owned production deployment reliability by leading blue-green deployment strategies using AWS ELB, enabling seamless feature rollouts with minimal disruption and faster rollback recovery.
  • Designed AWS Lambda + SQS pipelines to handle high-throughput workloads, increasing processing capacity 10× while maintaining system stability.
  • Designed and optimized a distributed multi-provider messaging routing layer with automated fallback strategies, reducing SMS costs by 33% and MMS costs by 50%.
  • Designed and implemented Redis-backed authentication and user-profile caching using Lua scripts, Pub/Sub invalidation, and cache-aside patterns, reducing auth-related MongoDB reads by 90%.
  • Built distributed cache invalidation and high-throughput Redis pipelines using ioredis, Redis Pub/Sub, and MongoDB change streams, improving multi-instance consistency and reducing API latency on cache hits by 60–85%.
  • Engineered distributed background job processing using Bull and Redis queues, offloading asynchronous workloads and reducing average request latency by 60%.
  • Designed and maintained scalable REST and WebSocket services using Node.js (Express/Fastify), supporting real-time messaging workflows.
  • Implemented real-time data updates using Socket.IO and MongoDB Change Streams, reducing redundant API calls by 40%.
  • Designed and developed a Zoho CRM extension using React.js, JavaScript, Zoho Extension SDK, and REST APIs for SMS/MMS within Zoho CRM.
  • Led backend security hardening initiatives, supporting ISO 27001 certification readiness and reducing operational security risks.
  • Mentored junior developers, reviewed critical backend changes, and promoted scalable engineering practices.

FluidFit.ai

Senior Software Engineer (Contract)
Dec 2025 – Feb 2026

Remote, USA · Multimodal AI media pipelines

Architected and optimized multimodal AI media pipelines integrating Google Gemini APIs for image and video generation — improving reliability, consistency, and operational scalability.

Click to unfold the full kitchen log →

  • Engineered high-performance image processing services using Sharp and Jimp, implementing advanced enhancement controls including brightness, contrast, sharpness, shadows, highlights, opacity, and midtone correction.
  • Integrated and orchestrated multiple generative AI models including Imagen 4, Veo 3.1, GPT Image 1.5, Qwen Image, and ImagineArt with provider fallback strategies.
  • Owned the complete development lifecycle of vector generation and image vectorization features, building React.js frontends and integrating Recraft Vectorize, Recraft V3 SVG, and Google Gemini APIs for automated SVG asset creation and transformation.

Signature Dishes

Recipes that scale from home kitchen to feast for millions

stl-javascript

npm · Open Source

A concise, well-tested library of core data structures and algorithms for JavaScript — stacks, queues, priority queues, circular queues, segment trees, and binary search trees. Built for learning, teaching, and lightweight production use.

npm install stl-javascript

OpenFeature.dev

Open Source

Contributed PHP getting-started documentation using Docusaurus to improve developer onboarding and adoption of standardized feature flagging practices. Because deploys should be reversible, not regrettable.

OpenFeature.dev →

Marginalia

Field notes on backends, systems, and the craft of building

Read all articles on Hashnode →

Education

Dr. A.P.J. Abdul Kalam Technical University

Bachelor of Technology

Computer Science & Engineering

Lucknow, India · Aug 2018 – June 2022

Foundations in computer science — later tempered in the fires of production messaging platforms, Lambda pipelines, and the relentless will to build systems that endure.