I Build Secure,Scalable SoftwareThat Drives Results.
Full Stack Engineer specializing in high-performance SaaS platforms, AI agent security, and bank-grade security architecture. Based in Jacksonville, FL.
Professional Journey
Nov 2025 – Present
Berlin, DE (Remote)
Core Full Stack Engineer at Stealth Startup (Fintech/Security)
Focusing on high-performance frontend architecture and financial compliance.
- ›The Win: Reduced server load by ~20% and improved Time-to-Interactive (TTI) by migrating legacy systems to Next.js 15 Server Actions.
- ›The Tech: Implemented Stripe Connect for multi-vendor marketplaces and secured the platform against XSS/CSRF attacks using HttpOnly cookies.
- ›The Scale: Managed production Linux VPS environments ensuring 99.9% uptime during high-concurrency events.
Aug 2025 – Present
Jacksonville, FL
Lead Product Engineer at Gerfach.com
Architected a zero-knowledge environment variable management platform to solve DevOps security leaks.
- ›The Innovation: Engineered a client-side encryption engine (AES-256-GCM) where the server never sees raw user secrets.
- ›The Speed: Built a "deploy-anywhere" Docker architecture allowing users to spin up self-hosted instances in under 120 seconds.
- ›The Quality: Achieved 95+ Lighthouse performance scores by minimizing client-side JavaScript.
Jun 2023 – Nov 2025
Remote
Contract Software Engineer at High-Scale Architecture & Data Engineering
Delivered full-cycle engineering solutions for US and EU clients, focusing on backend infrastructure.
- ›The Architecture: Decoupled monolithic legacy code into 12 scalable Node.js microservices handling 15,000+ daily requests.
- ›The Optimization: Rescued a bottlenecked 800GB+ PostgreSQL database, reducing query time by 40% (600ms to 360ms).
- ›The Pipeline: Built Python/Node.js ETL pipelines to process 500GB/month of raw data, slashing processing windows from 12 hours to 3 hours.
Expected Aug 2026
Kyiv, Ukraine
B.S. Computer Science at National Aviation University
Focus: Distributed Systems & Network Security.
Results That Speak
vs-mcpaudit – MCP Security Scanner
View LiveAI agents using MCP servers are deployed without security audits. No existing tools actively test running MCP servers for vulnerabilities like SSRF, injection, or data exfiltration.
Built a CLI security scanner with 8 audit modules (6 passive, 2 active) that stress-tests live MCP servers. Includes fuzzing for command injection, path traversal, SQLi, and XSS, plus SARIF output for CI/CD integration.
First-to-market MCP security tool with 7,500+ LOC, 12 test suites, and enterprise features (compliance mapping, CI mode, git hooks). Published as an open-source CLI on npm.
Gerfach.com – Zero-Knowledge Secrets Manager
View LiveDevOps teams were leaking secrets through insecure .env file sharing, creating compliance risks and security vulnerabilities.
Built a zero-knowledge platform with client-side AES-256 encryption where the server never sees raw user data, plus a "deploy-anywhere" Docker architecture.
Reduced server hosting costs by 20% and achieved a 95+ Lighthouse score, cutting page load times in half compared to competitor tools.
Real-Time Financial Intelligence Platform
Investment firms lacked real-time portfolio analytics, making decisions based on 15-minute-delayed data.
Engineered a WebSocket-powered dashboard with streaming AI analysis and Stripe subscription billing for multi-tier access.
Processing 10,000+ real-time data points per second with sub-100ms latency, enabling clients to make faster investment decisions.
How I Can Help
Whether you need a dedicated engineer on your team or a fixed-scope project delivered end-to-end.
Embedded Engineer
Full-time / Long-term
I embed directly into your engineering team, own features end-to-end, and ship production code daily. Available for W-2, 1099, or B2B arrangements.
- Full-stack feature ownership (frontend + backend)
- Code reviews, architecture decisions, and mentoring
- Direct collaboration with product, design, and QA
- Proactive security audits and performance optimization
MVP Sprint
6 weeks
I take your idea from spec to production-ready MVP. Includes architecture design, core feature development, cloud deployment, and a launch-ready product with CI/CD pipeline.
- Full-stack application (Next.js 15 + Python/Node backend)
- Cloud deployment (AWS/Vercel) with CI/CD
- Authentication, database, and API architecture
- Weekly demos and async communication
Architecture & Security
8–12 weeks
I design and implement production-grade platforms with bank-level security. Zero-knowledge encryption, RBAC, compliance-ready infrastructure, and performance optimization.
- AES-256 encryption & zero-knowledge architecture
- RBAC, audit logging, and compliance frameworks
- Database optimization & microservices design
- Security audit and performance review
What People Say
"Volodymyr delivered exceptional work on our fintech platform. His security-first approach and attention to detail made all the difference in passing our compliance audit."
Michael Chen
CTO, Fintech Startup
— Financial Dashboard
"The migration to Next.js 15 was seamless. Our load times dropped significantly and the codebase is now much more maintainable. He communicated proactively at every step."
Sarah Mueller
Engineering Lead, Berlin
— Platform Migration
"Outstanding communication and German-level precision in his work. Highly recommend for any security-sensitive project."
Thomas Weber
Product Manager, EU Client
— Security Audit