Himanshu Kumar

Meet Himanshu

5.00 (8)

47 following40 followers

I build Replit apps and make sure nobody can break into them.

Fullstack software engineer, security engineer, and automation engineer specializing in Replit apps. I build new apps from scratch and fix broken ones, with a focus on cybersecurity, authentication, and production stability.

I'm a former HackerOne bug bounty hunter. I spent 2 years finding and reporting security vulnerabilities in production web apps: SQL injection, XSS, authentication bypasses, OWASP Top 10 across the board. I competed in Hack The Box CTFs.

Now I use that background to build apps that are secure from day one. Every auth system, every API endpoint, every database query I write is informed by knowing exactly how it could be exploited.

What I build:
• Full-stack web apps and MVPs (idea to deployed product in 7 days)
• Workflow automation systems that replace manual processes with code
• AI integrations using OpenAI and Claude APIs that work in production
• Secure multi-tenant SaaS platforms with OAuth, JWT, RBAC, and session hardening
• Security audits and penetration testing for existing apps

What I've shipped:
• Workflow Automation for Industrial Services (verified on Contra): automated workflows that saved 15+ hours/week in admin work
• Real-time booking automation platform with sub-second response times on AWS
• Secure multi-tenant auth system with OAuth, JWT, Redis caching, and row-level security
• AI-powered video generation pipeline with automated YouTube uploads

Stack: Python, Node.js, TypeScript, Next.js, Flask, Supabase, AWS, PostgreSQL, Redis, Stripe, Replit, OpenAI/Claude APIs.

I work fast, I communicate clearly, and I don't disappear mid-project. Every app I ship comes with security baked in, not bolted on after the fact.

Currently taking on: MVP builds, AI automation, secure SaaS projects, Replit app development, and security audits.

Replit ExpertCertified by Replit as highly skilled.

Earned $1k+Verified earnings from completed projects.

Identity verifiedVetted for secure and trusted collaboration.