# Mihail Griniuc

> Software Engineer @ Koopel | CS Grad

Location: New York, New York, United States
Profile: https://flows.cv/mihail

I’m Mihail Griniuc, founder of Koopel, a peer-to-peer marketplace designed to make buying and selling used items simple, safe, and stress-free.

Before starting Koopel, I built a custom embroidery business on Etsy that generated over $500K in just a little over two years. That experience showed me how frustrating selling can be - from high fees to unreliable buyers to complicated processes.

I started Koopel to create the kind of marketplace I always wished existed. I built the website from the ground up and launched the mobile apps for early testers so anyone can list items quickly and shop with confidence.

I’m passionate about creating practical, easy-to-use tools that actually help people. If you’re interested in marketplaces, startups, or building something from scratch, I’d love to connect.

## Work Experience
### Full Stack Software Engineer @ Koopel
Jan 2025 – Present | New York City Metropolitan Area
Tech: React, React Native, Next.js, Node.js, PostgreSQL, AWS, REST APIs, LLM APIs (OpenAI/GPT)

• Built and deployed a full-stack nationwide peer-to-peer marketplace enabling secure buying and selling with shipping-first infrastructure.
• Developed the platform end-to-end (frontend, backend, APIs), and shipped a cross-platform mobile app (iOS + Android) for early users.
• Designed and implemented core marketplace systems including listings, search, user accounts, messaging, and transaction flows.
• Engineered trust and safety features such as escrow payments, account verification, and anti-fraud mechanisms to improve user reliability.
• Reduced user drop-off by 80% and improved page load performance by 70% through UX optimizations, performance tuning, and streamlined user flows.
• Shipped features rapidly in a fast iteration cycle, prioritizing based on user feedback and marketplace activity.

### Software Engineer @ Proficon Services LLC
Jan 2023 – Jan 2025 | New York, NY
Tech: Node.js, PostgreSQL, REST APIs, LLM APIs (OpenAI/GPT)

• Built an AI-powered B2B invoicing system that automated invoice generation from client activity, reducing
billing cycle time by 75% and minimizing manual errors
• Automated invoice validation, approval workflows, and PDF generation, reducing manual processing time
and eliminating billing bottlenecks
• Integrated Node.js and PostgreSQL-based services with internal accounting systems via REST APIs,
enabling real-time financial reporting and seamless data flow
• Integrated LLM-based text understanding to interpret unstructured client inputs and convert them into
structured invoice line items

### Software Engineer @ YRB CLUB LLC
Jan 2021 – Jan 2023 | New York, NY
Tech: Node.js, PostgreSQL, AWS

• Built and maintained internal tools that streamlined operations, reducing support workload and improving
system reliability
• Improved order fulfillment accuracy by 35% by designing automated database sync jobs and validation
scripts in Node.js
• Led a small engineering team, reviewed code changes, and improved delivery velocity through better task
breakdown and documentation
• Boosted customer retention by 20% by analyzing behavioral data and implementing targeted improvements

### Technical Support Specialist @ 1Voice
Jan 2020 – Jan 2020 | Brooklyn, NY
• Delivered exceptional customer service remotely from home, ensuring high satisfaction levels
• Provided comprehensive technical support solutions remotely
• Facilitated hardware and software setup for business owners and employees, both remotely and on-site
• Conducted remote product troubleshooting to identify and resolve issues efficiently
• Investigated and resolved customer-related issues related to services and servers, ensuring optimal functionality


## Education
### Bachelor of Science in Computer Science
Kingsborough Community College

### Bachelor of Science in Computer Science
Universitatea Tehnică a Moldovei


## Contact & Social
- LinkedIn: https://linkedin.com/in/mihail-griniuc
- Website: https://www.Koopel.com

---
Source: https://flows.cv/mihail
JSON Resume: https://flows.cv/mihail/resume.json
Last updated: 2026-04-01