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Pavel Mg

@pavelmg

Backend Developer at a fintech startup building a payments product with a double-entry ledger and safeguards against double charges.

Poland

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At a fintech startup, I designed and built the backend of a pre-launch payments product with NestJS, TypeScript, PostgreSQL, and Redis. I implemented a double-entry ledger and payment state machine, with safeguards including idempotent payments and an audit trail.

At Edgio / Solara6, I delivered React and Next.js features across e-commerce and web projects. I redesigned a conversion-critical Product Detail Page template for multiple brands and built a custom Tiptap node for creating messages from Podium API templates.

I also resolved significant LCP issues using Cheerio for dynamic DOM manipulation at the CDN edge, and migrated a legacy Dynamics 365 frontend to Next.js by reconstructing its behavior from production.

At Compeerstaff, I led frontend development from the ground up, including a Tiptap chat interface and reports with real-time collaboration. At Beskarstaff, I delivered website improvements and supported two junior developers through onboarding, code reviews, and daily technical guidance.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Fintech Startup (NDA)

Jul 2026 - Present (3 months)

Designed and built the backend of a pre-launch payments product in NestJS, TypeScript, PostgreSQL, and Redis. Implemented a double-entry ledger, payment state machine, and integrated payment and e-ID providers with security measures.

NestJS TypeScript PostgreSQL Drizzle Redis BullMQ Zod OpenAPI Docker CI CD Vitest Claude Code Encryption Rate limiting

Senior Frontend Engineer

Edgio / Solara6

Aug 2022 - Jul 2026 (3 years 11 months)

Delivered frontend across diverse US-based e-commerce and web projects in React/Next.js, including redesigns, performance optimization, and bugfixing. Implemented custom Tiptap nodes, resolved LCP issues, and migrated legacy D365 frontend to Next.js.

React Next.js TypeScript Tiptap Cheerio CDN Core Web Vitals Lighthouse PageSpeed Insights Swiper D365 JavaScript HTML CSS SCSS

Senior Fullstack Developer

Beskarstaff

Nov 2024 - Jan 2026 (1 year 2 months)

Delivered features for production websites using Next.js and Nuxt, mentored junior developers, integrated PostHog analytics, and implemented SSG with i18n. Automated processes with Python and Selenium.

Next.js Nuxt PostHog Docker Docker Compose SSG i18n CMS Python Selenium Code Review Mentorship

Lead Frontend Developer

Compeers AI

Nov 2023 - Sep 2024 (10 months)

Led frontend architecture and development from the ground up in a startup environment. Developed rich-text chat interfaces and collaborative reports with Tiptap and Hocuspocus, and integrated Plotly for data visualization.

Tiptap Hocuspocus Plotly React TypeScript Frontend Architecture Collaboration Startups

Frontend Developer

Smart 3D

Apr 2022 - Aug 2022 (4 months)

Implemented landing pages based on design mockups, participated in feature planning, and collaborated with design team on UI decisions. Handled deployments and testing processes.

HTML CSS JavaScript Landing Pages UI Deployment Testing

Frontend Developer

Webstap

Aug 2021 - Apr 2022 (8 months)

Migrated a large-scale e-commerce platform from Next.js 9 to 12 with Effector state management. Designed and developed an interactive web UI using Fabric.js on HTML Canvas for a CLI boilerplate tool.

Next.js Effector Fabric.js HTML Canvas JavaScript TypeScript State Management Migration