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Senior Frontend Engineerwith 7+ years of experience building production React and Next.js applications, plus hands-onNode.jsand.NETbackend experience. - 🏢 Currently at Hyperbolic ApS (remote, Copenhagen) — Senior Frontend Engineer (Full-Stack scope), developing regulated pharmaceuticals manufacturing solutions.
- ⚡ Cut critical API latency from 20s to <1s, and reduced memory usage by 50%+ with list virtualization.
- 🌍 Delivered autonomously with distributed teams across EMEA and APAC in remote, async environments.
- 🚀 Proven at shipping high-impact frontend apps autonomously with measurable performance gains through virtualization, SSR, and image optimization.
- 🎓 B.Sc. in Computer Science & Engineering (MIST), MBA in Operations & Project Management (University of Mysore).
- 💭 Open to full-time remote opportunities — reach me at
saqlain.mahmud@yahoo.comor LinkedIn.
Jan 2025 – Present · Copenhagen, Denmark (Remote)
- Delivered end-to-end core features across multiple production releases in React while working fully async/remote with a distributed team supporting regulated pharmaceuticals manufacturing operations.
- Led migration of the entire regulated solution in production to React 19 (from v18) and Ant Design 6 (from v5), to match client requirements and eliminate deprecated dependencies.
- Designed and built multiple .NET APIs powering core production workflows across 3+ app modules, enabling the React frontend to support real-time regulated operations.
- Cut critical API latency from 20s to <1s through database indexing and denormalization.
- Wrote unit and integration tests with Vitest and React Testing Library across core React modules, catching regressions pre-release and maintaining 60%+ test coverage.
Feb 2024 – Dec 2024 · Dhaka, Bangladesh
- Led a sub-team of 2 frontend engineers on a regulated pharmaceuticals manufacturing solution to onboard, review and mentor them through multiple releases.
- Implemented virtualization with TanStack Virtual to reduce memory usage more than 50% so that users can interact smoothly without crashing.
- Established code review practices and frontend standards for a 3-person team, developed the design system with theming along with reusable components (based on Ant Design), improving delivery consistency across 10+ feature releases per quarter.
Mar 2022 – Jan 2024 · Dhaka, Bangladesh
- Raised Lighthouse SEO score from 53 to 84 with Next.js SSR and image optimization, and cut landing-page image sizes 80% for a social network platform.
- Built a React admin dashboard for an IoT startup managing smart public toilets, enabling real-time monitoring of 18 devices and cutting manual inspection rounds by 60%.
Sep 2019 – Feb 2022 · Dhaka, Bangladesh
- Built an end-to-end scheduling system (React, Nest.js) for a dental clinic, cutting server latency 15% and automating bookings to increase capacity 20%.
- Implemented real-time messaging with Socket.io and push notifications with Pusher.js, automating reminders for all bookings, reducing no-shows.
- Developed a Japanese career platform from scratch with React and Express.js, connecting working professionals to share insights about organizations.
Built from scratch an enterprise app that replaced the manual hand-building of very large, complex XML files with an automated, peer-reviewed workflow. Used daily in production of pharma products worth millions of dollars in Denmark and the US. Led a 2-engineer frontend sub-team, built a themed React/Ant Design component system, and owned performance across frontend and backend (list virtualization, API tuning, database indexing).
Tech Stack: React 19 · TypeScript · Ant Design · TanStack Virtual · .NET · Azure SQL · Azure Pipelines · Vitest
Built a centralized booking system for a Japanese dental clinic's branches that prevents scheduling conflicts and automates reminders to reduce no-shows.
Tech Stack: React · TypeScript · Material UI · Nest.js · Node.js · Socket.io · Pusher.js · MySQL · Jest
Built a social and collaboration platform that lets KSA game developers connect and work together on one platform instead of several tools. Handled Next.js SSR and image optimization for SEO.
Tech Stack: Next.js · React · TypeScript · Ant Design
Built the React admin dashboard that lets a startup monitor and control its smart public toilets in Dhaka in real time, reducing the need for manual inspection rounds.
Tech Stack: React · TypeScript · Ant Design · bhumijo.com
- MBA in Operations and Project Management (Online) — University of Mysore (Jul 2022 – Nov 2024)
- B.Sc. in Computer Science and Engineering — Military Institute of Science and Technology (Feb 2015 – Dec 2018)
- LangGraph.js: Building Agents with JavaScript — LinkedIn (Sep 2026)
- Prompt Engineering with LangChain — LinkedIn (Sep 2026)
- Frontend Developer (React) — HackerRank (Aug 2026)
- React: Design Patterns — LinkedIn (May 2022)
- MERN Stack Front To Back: Full Stack React, Redux & Node.js — Udemy (Feb 2019)