I'm Ajith Kumar Karudasevai (@ajithakdev). I design resilient cloud architecture, optimize complex databases, and build developer tools. Currently engineering healthcare SaaS at The Valor Solution.
Multi-tenant workflows, queue systems, and event-driven backends with Amazon SQS.
MongoDB/DocumentDB aggregation pipelines, compound ESR indexing, and query plan tuning.
High-performance CLI tools and contributions to open-source in Rust and C.
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Developer utilities that never leave your browser.
19 client-side tools: an API client with cURL import, JWT signing and decoding, hashing, password and NanoID generation, timestamp and cron helpers, JSON to TypeScript, regex tester. No backend, no tracking, installs as a PWA and works offline.
A speed test in your browser toolbar.
Browser extension that measures download, upload, ping, jitter and packet loss against Cloudflare's edge, rates readiness for calls, streaming and gaming, keeps a local history and exports a PDF report. Ships with a self-hostable Express server.
Every electricity bill in Tamil Nadu, one screen.
Tracks TNEB bills for many meters at once without logging in to the portal. Reads the portal's captcha in-process with Sharp and Tesseract in under a second, and keeps the meter list encrypted in the browser with AES-GCM. Tamil and English.
A curated shopping storefront, run from the edge.
Mobile-first affiliate storefront with search, budget filters and short links for social posts, plus a private admin for the catalogue. Redirects return at once and log clicks in the background; outbound fetches are guarded against SSRF.
Engineering notes from real production bugs.
The writing site: incident-style write-ups of bugs, their root causes and the verified fix. Static Astro with full-text search, a full-content RSS feed and dual-theme code highlighting.
The Valor Solution
Co-designed and shipped our in-house Form Builder platform to replace a paid third-party vendor, covering dynamic validation, presigned S3 uploads, and SQS-driven EMR workflows. Built a business-hours-aware fax routing service with RingCentral APIs and retries. Re-engineered DocumentDB aggregations, dropping our patient-list pipeline latency from 26s to 19s and moving high-volume jobs to paginated batches to prevent OOM errors. Hardened multi-tenant API security and introduced pytest CI quality gates.
The Valor Solution
Contributed to backend API development, bug fixes, and MongoDB schemas in Node.js and TypeScript. Earned a full-time Junior Software Developer promotion after consistently delivering production features and clean code.
Anna University Regional Campus Madurai
Maintained 150+ computer systems across 3 university labs. Supported students and faculty with Linux and Windows administration, network troubleshooting, and day-to-day lab infrastructure.
Investigations, performance tuning, and architectural decisions.
Read all postsOpen for collaboration, system design discussions, and engineering roles.
ajithakdev