Building high-throughput backends & modern digital products.
I'm Harsh Jadav, a Software Engineer specializing in scalable API architectures, high-concurrency backend services, and modern digital platforms. Proven track record architecting FirmsLedger (10,000+ US manufacturers directory) and backend infrastructure integrating 1,200+ games.
Core Production Stack
Harsh Jadav
Software Engineer
Backend & Full-Stack Systems
Philosophy
Iliketurningcomplicatedengineeringproblemsintosimple,reliabledigitalproducts.
Featured Work
Selected Projects
Production systems, high-concurrency backends, and client products delivered with precision.
FirmsLedger
B2B Manufacturing Directory
A free, SEO-first B2B directory of 10,000+ US manufacturers across 11 industries and 95 specialties. Features automated AI fact-checked company profiles, an RFQ marketplace, and edge deployment on Cloudflare Workers.
iGaming Platform
Gaming Backend Platform
Production backend for a multi-provider gaming platform — architected services supporting 1,200+ games with real-time session management, multi-provider wallet operations, and idempotent transaction processing.
PhishEye
ML Cyber Threat Intelligence
Enterprise-grade cybersecurity platform combining a 30-dimension Random Forest ML classifier (96.98% CV accuracy, 99.56% ROC-AUC) with real-time heuristic forensic engines, terminal CLI, and REST API.
ChillSpace
Full-Stack Rental Marketplace
Full-stack Airbnb-style rental platform with real-time booking workflows, JWT authentication, third-party payment gateway integration, and clean RESTful API contracts.
Additional Projects & Systems Directory
5 ProjectsCapabilities
Services & Expertise
From initial concept to deployment — scalable architecture built for growth.
Full-Stack Applications
High-performance web applications, programmatic directories, and management platforms engineered for speed, clean UX, and production stability.
Backend & Distributed Systems
High-concurrency RESTful APIs, modular monolith architectures, idempotent wallet transactions, Redis caching, and robust relational schemas on PostgreSQL.
AI & Intelligent Automation
Production AI pipelines including local LLM speech assistants, automated fact-checking pipelines, NLP workflows, and custom automation tools.
Track Record
Professional Experience
Production-level engineering across backend infrastructure, AI workflows, and software development.
Jan 2026 – Present
Backend Engineer
- Architected a NestJS/TypeScript modular-monolith casino backend serving 1,200+ games across 2 direct providers (OnlyPlay, Jacktop) and 1 major aggregator (EGS) aggregating 25+ game studios, with real-time session management on PostgreSQL, Prisma, and Redis.
- Engineered an idempotent seamless-wallet engine for debit, credit, rollback, and settlement callbacks, using session-level mutex locking to eliminate double-spend and race conditions.
- Secured provider callbacks with HMAC-SHA256/MD5 signature verification and kept multi-currency balances consistent through exchange-rate locking and automated reconciliation.
- Integrated the Payram crypto gateway with replay-protected webhooks and automated payouts; built a GGR affiliate revenue-share module on EventEmitter2 events with row-level locking (
SELECT ... FOR UPDATE). - Built bet-cycle simulation and dual-ledger E2E suites that verified zero-discrepancy balances before certification; shipped to AWS via multi-stage Docker builds and GitHub Actions CI/CD.
Tech: NestJS · TypeScript · PostgreSQL · Prisma ORM · Redis · AWS · Docker · Swagger
Jun 2025 – Dec 2025
AI Engineer
- Optimised multilingual NLP processing pipelines supporting AI-powered dubbing workflows across 5+ target languages
- Contributed to audio-processing and speech-synthesis integrations for production-scale dubbing workloads
- Worked on prompt engineering strategies and LLM-based translation pipelines
Tech: Python · NLP · Speech Synthesis · AI/ML
Jan 2025 – Apr 2025
Full-Stack Developer Intern
- Designed RESTful API endpoints and built MERN stack UI features in an Agile team environment
- Developed React components and Node.js backend services end-to-end
Tech: MongoDB · Express.js · React.js · Node.js
Jun 2024 – Jul 2024
Python Backend Intern
- Designed and tested backend REST APIs using Django, structuring data models and endpoints for internal business tools
- Wrote database queries and optimized relational schema design in PostgreSQL
- Collaborated in an Agile workflow, reviewing pull requests and writing clean, documented backend code
Tech: Python · Django · REST APIs · PostgreSQL
About & Background
Quick Facts
Software Engineer focused on reliability, performance, and clean product execution.
I'm Harsh — a software engineer based in Ahmedabad, India. I architect and ship production digital products end-to-end: from high-concurrency database schemas and edge serverless APIs to intuitive frontend user experiences.
My core production experience is at an iGaming platform, where I architected backend infrastructure integrating 1,200+ games across certified external providers with real-time wallet operations, idempotent transaction handling, and automated reconciliation.
Outside of corporate production, I architect and scale platforms like FirmsLedger (a 10,000+ US manufacturers directory running on Cloudflare Workers and Neon Postgres), ML threat intelligence engines like PhishEye, and local voice assistants like VoiceDesk. I adapt quickly to whatever technologies best solve the core business challenge.
Academic Foundation
B.E. Computer Engineering — SAL College of Engineering
Sept 2021 – May 2025 · CGPA: 7.43 / 10
Tooling & Technologies
Technical Capabilities
Engineered with modern frameworks, reliable database solutions, cloud platforms, and production AI tools.
Frontend
6Backend
6Databases & Storage
8Cloud & Edge
6AI & ML
5APIs & Tooling
6Contact
Have something worth building?
Let's talk →
Whether you need a full-stack web app, high-concurrency API infrastructure, or intelligent AI integrations — I'd love to discuss how I can help.