# Greg J.

> Building @ Se.ro, Founder @ Gexx.ai

Location: Greater Boston, United States
Profile: https://flows.cv/gregj

Experienced builder for platforms large and small. I bring 10+ years of experience in building products from the ground up and accelerating businesses towards product market fit. 

I'm passionate about technology and love learning about cutting-edge innovations. If you're working on something exciting and need help pushing your product to the next level, let's connect!

## Work Experience
### Senior Software Engineer @ Serotonin
Jan 2025 – Present | Boston, Massachusetts, United States

### Founder @ gexx
Jan 2025 – Present | Boston, Massachusetts, United States

### Software Engineer @ Klaviyo
Jan 2025 – Jan 2025 | Boston, Massachusetts, United States

### Senior Software Engineer @ Serotonin
Jan 2024 – Jan 2025

### Lead Engineer, Core Product @ PIN (Power in Numbers)
Jan 2023 – Jan 2023 | Boston, Massachusetts, United States
• Spearheaded an agile engineering team focused on rapid deployment, code quality, and user experience, and customer satisfaction.
• Architected a modern full-stack application using TypeScript, React, and Remix, leveraging Prisma for robust database management.
• Orchestrated cloud infrastructure migration to MongoDB on GCP and Fly.io/Docker, significantly improving application performance and scalability.

### Lead Engineer, Core Product @ Dispense
Jan 2021 – Jan 2022 | Boston, Massachusetts, United States
• Built on mapping libraries to help dispensaries visualize legal delivery zones, creating a more resilient and trustworthy cannabis delivery system.
• Orchestrated an extensive migration effort from Vue.JS to React.
• Modernized and simplified a complex legacy codebase, enhancing security and scalability of internal and external REST APIs.
• Improved build pipeline stability and speed by transitioning from Wercker to GitHub Actions, utilizing Esbuild for faster build times.

### Software Engineer II, Client Event Infrastructure @ Twitter
Jan 2020 – Jan 2021 | Cambridge, Massachusetts, United States
• Designed and built an extensive client-event collection system for Twitter web
• Collaborated with web engineers to implement React Hooks guidelines and migration strategies at Twitter.
• Developed a tool to convert Thrift schemas into Flow types, enhancing efficiency and accuracy.
• Utilized internal metrics tooling to monitor video client-event data and resolve anomalies on the web platform.

### Senior Software Engineer, Web Platform @ 128 Technology
Jan 2017 – Jan 2020 | Burlington, Massachusetts, United States
• Designed and implemented a real-time asset management system for distributed network routing devices.
• Developed an open-source MUI based component library for React applications.
• Redesigned router UI's for mobile support-engineers, enhancing searchability and navigation efficiency.

### Software Engineer I, Web Infrastructure @ Northrop Grumman
Jan 2015 – Jan 2017 | Newport, Rhode Island, United States
• Developed a robust management system for manual aggregation in complex simulation environments.
• Implemented feedback from management and stakeholders for a smooth transition to a new product.
• Mentored new engineers and interns to help them acclimate to the environment.


## Education
### Bachelor of Science - BS in Computer Science
University of Massachusetts Dartmouth


## Contact & Social
- LinkedIn: https://linkedin.com/in/gregermendle

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Source: https://flows.cv/gregj
JSON Resume: https://flows.cv/gregj/resume.json
Last updated: 2026-03-28