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Bestine Payyappilly

Building India’s Largest Financial Literacy Platform · Full-Stack & Mobile Developer · Fintech | EdTech | Consumer Apps

Bengaluru

5+ years of work experience

Streak (YC W22)
Mar 20242 y 5 moPresent

Bengaluru, Karnataka, India

Product Engineer with ~5 years shipping consumer products end to end: the interface, the API behind it, the payments inside it, and the release that ships it. At Streak (YC W22) I was sole mobile architect for a teen fintech app with 500k+ downloads on iOS and Android, owning architecture, release engineering, and on-call across React Native, Swift, and Kotlin, mentoring 4 engineers, and working with the founders on what to build next. I also built and own the education platform the business runs on, taking it from zero to 500+ schools and 100,000 participants: a React to Next.js migration run on a documented runbook and rollback path with no downtime at cutover, checkout across 4 payment gateways verified server-side instead of trusting client callbacks, and production AI on the Claude API with RAG on pgvector and a LangGraph multi-agent pipeline, A/B tested with 500 students. On my own I designed and shipped Synqed, an Android to Mac continuity app in Kotlin and Swift that keeps notifications, files, and calls on an encrypted link over your own Wi-Fi, with no cloud or account behind it. Based in Bangalore.
Streak (YC W22)
Oct 20241 yr 4 mosJan 2026

Hybrid

• Sole mobile architect for a fintech app, overseeing both iOS and Android platforms with over 500,000 downloads. • Developed a comprehensive payments ecosystem for teenagers, including prepaid cards and gamification features. • Engineered a robust 7-layer security stack with custom native modules for secure payment flows.
Streak (YC W22)
Aug 20222 yrs 3 mosOct 2024

Bengaluru, Karnataka, India

Streak (YC W22)
Feb 20226 mosJul 2022

Bengaluru, Karnataka, India

Techolution
Dec 20213 mosFeb 2022

Remote

Tago Care
Oct 20213 mosDec 2021

Remote

Worked as a React-Native developer for Tago Care.
GitHub
@bestinepayyappilly
Personal portfoliobestinepayyappilly.com

Bestine’s AI Stack

anthropic apis
anthropic apis
claude code
claude code
claude
claude
cursor
cursor
notebooklm
notebooklm
openclaw
openclaw

Education

SRM IST Chennai

Bachelor of Technology - BTech, Electrical, Electronics and Communications Engineering

SRM IST Chennai

20184 yrs2022

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Headline

Building India’s Largest Financial Literacy Platform · Full-Stack & Mobile Developer · Fintech | EdTech | Consumer Apps

About

I learnt a new language and submitted a phd assignment for a friend for free beer and pizza.

Location

Bengaluru

AI stack

anthropic apis

claude code

claude

cursor

notebooklm

openclaw

Work experience

Senior Software Engineer 2 at Streak (YC W22), Mar 2024 - Present · 2 y 5 mo, Bengaluru, Karnataka, India, Product Engineer with ~5 years shipping consumer products end to end: the interface, the API behind it, the payments inside it, and the release that ships it. At Streak (YC W22) I was sole mobile architect for a teen fintech app with 500k+ downloads on iOS and Android, owning architecture, release engineering, and on-call across React Native, Swift, and Kotlin, mentoring 4 engineers, and working with the founders on what to build next. I also built and own the education platform the business runs on, taking it from zero to 500+ schools and 100,000 participants: a React to Next.js migration run on a documented runbook and rollback path with no downtime at cutover, checkout across 4 payment gateways verified server-side instead of trusting client callbacks, and production AI on the Claude API with RAG on pgvector and a LangGraph multi-agent pipeline, A/B tested with 500 students. On my own I designed and shipped Synqed, an Android to Mac continuity app in Kotlin and Swift that keeps notifications, files, and calls on an encrypted link over your own Wi-Fi, with no cloud or account behind it. Based in Bangalore.

Senior Frontend Developer/ Senior Mobile Developer at Streak (YC W22), Oct 2024 - Jan 2026 · 1 yr 4 mos, Hybrid, • Sole mobile architect for a fintech app, overseeing both iOS and Android platforms with over 500,000 downloads. • Developed a comprehensive payments ecosystem for teenagers, including prepaid cards and gamification features. • Engineered a robust 7-layer security stack with custom native modules for secure payment flows.

Frontend Developer at Streak (YC W22), Aug 2022 - Oct 2024 · 2 yrs 3 mos, Bengaluru, Karnataka, India

React Native Developer at Streak (YC W22), Feb 2022 - Jul 2022 · 6 mos, Bengaluru, Karnataka, India

Javascript Developer at Techolution, Dec 2021 - Feb 2022 · 3 mos, Remote

React Native Developer at Tago Care, Oct 2021 - Dec 2021 · 3 mos, Remote, Worked as a React-Native developer for Tago Care.

Education

Bachelor of Technology - BTech, Electrical, Electronics and Communications Engineering, SRM IST Chennai

Public links

github: https://github.com/bestinepayyappilly

bestinepayyappilly.com: https://bestinepayyappilly.com/