Hello, I'm Sandeep Kumar Mandal.I'm a Frontend Tech Lead.

Associate Tech Lead

January 2023 – Present · Hyderabad

UI Tech Lead | Frontend Architecture | Performance & Scalability

Aspire is a leading B2B financial operating system helping businesses across Southeast Asia manage spend, payments, and cash flow at scale.

As a UI Tech Lead, I led the design and development of scalable, high-performance frontend systems while mentoring and empowering a team of engineers. I played a key role in defining UI architecture, enforcing coding standards, and driving best practices across performance optimization, accessibility, and responsive design.

I collaborated closely with product managers, designers, and backend teams to deliver seamless, end-to-end user experiences aligned with business goals.

Key contributions

• Own frontend architecture across Aspire's core product — setting direction for structure, performance, and engineering standards
• Built scalable UI systems supporting 150+ global currencies and multi-region product expansion
• Achieved ~90% automated test coverage across the frontend using Cypress and Playwright
• Drove measurable Core Web Vitals improvements across key product surfaces
• Defined coding standards, component architecture, and frontend best practices adopted org-wide
• Mentored frontend engineers on performance, accessibility, and scalable design patterns
• Partnered with product, design, and backend teams to ship end-to-end features at scale

Senior Frontend Engineer

July 2021 – January 2023 · Bengaluru, Karnataka

Key contributions

• Joined Aspire as a Senior Frontend Engineer, contributing to the foundation of the product before being promoted to Tech Lead
• Built and shipped core product features across Aspire's spend management platform
• Established frontend testing practices and component patterns that scaled with the team
• Collaborated closely with design and backend teams on multi-currency and payment flows
• Drove early performance optimisation efforts that laid the groundwork for later Core Web Vitals improvements

Senior Software Engineer

May 2020 – June 2021

Key contributions

• Engineered and maintained frontend systems serving 100k+ requests per minute across RummyCulture and RummyTime
• Owned end-to-end frontend architecture for both platforms — structure, performance, and delivery standards
• Revamped the entire RummyCulture website from scratch, improving Web Vitals score from 30 → 90+
• Built RummyTime independently as sole frontend engineer — owned architecture, infrastructure setup, and launch, shipping with a 95+ Web Vitals score
• Delivered internal dashboards including Game History and Champions Leaderboard as part of the widgets team

UI Engineer

April 2019 – May 2020

Key contributions

• Architected the entire frontend from scratch — established structure, tooling, and engineering standards for a greenfield product
• Built and shipped Videolake (lake.videoken.com) — an enterprise video exchange platform — from zero to production
• Developed Enterprise Search (search.videoken.com) — an AI-powered video search experience for large organisations
• Revamped the core product dashboard (v2-dashboard.videoken.com) and the public-facing website (videoken.com)
• Enforced code quality through regular reviews and maintained best practices across the frontend codebase
• Partnered directly with designers and product managers to translate product vision into shipped features

Sr. UI Developer

November 2017 – April 2019

Key contributions

• Built and shipped five internal platforms from scratch — Rupeek Campaigns (in-house marketing tool), IMS (Inventory Management), Audits, Insights (analytics UI), and Payments
• Revamped the entire public-facing website (rupeek.com) — improving structure, performance, and user experience
• Built engineering.rupeek.com independently in a single day
• Developed reusable, scalable frontend abstractions powering multiple internal tools across the org
• Maintained code quality standards through regular reviews and enforced frontend best practices team-wide

Web Developer

May 2016 – November 2017

Key contributions

• Built frontend interfaces for multiple web applications from scratch, translating design specs into production-ready code
• Developed responsive, cross-browser compatible UIs across a range of client and internal projects
• Maintained and improved existing web applications, ensuring performance and accessibility standards were met

UI Developer

September 2015 – May 2016

• Front-end from PSD; responsive layouts, accessibility, and cross-browser compatibility.
• CMS, YouTube, Google Maps, and live chat integrations.