Himanshu Kumar

Meet Himanshu

5.00 (8)

Followed by Kraig M, Deniz U, and Malick M

47 following40 followers

Most Replit developers build your app. I build it and make sure nobody can break into it.

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. I know how attackers think because I used to be on that side of the wall.

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:
- Operations OS for Cascade Water 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.

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