Full-Stack & Mobile Developer

The role

You’ll own the whole Samayo codebase: backend, web frontend, AI chat, payments and infrastructure. You’ll also build our Android and iOS apps in React Native, using the existing API. It’s a small team where you’ll build, ship, deploy and fix things when they break.

What you’ll doBackend and AI

• Own and extend the FastAPI (Python) backend: APIs, the Postgres schema and migrations, auth, caching and rate limiting.
• Improve the AI features: streaming chat (SSE), prompts, routing between LLM providers, token cost tracking and fallbacks.
• Maintain integrations with Razorpay, MSG91 (OTP SMS and WhatsApp), Resend, Google Maps and Google Sheets.

Web

• Own the web app: a mobile-first, plain-JavaScript PWA with a multi-step onboarding funnel, streaming AI chat, Razorpay checkout and consultation booking.
• Build and tune the marketing funnel: landing pages tailored to each ad, GTM and Meta Pixel events, and A/B tests to improve conversion.
• Keep the web app fast and reliable on low-end Android phones, slow networks and in-app browsers (Instagram, Facebook).

Mobile

• Build and ship the React Native apps for Android and iOS, with the same features as the web app: onboarding, birth-chart readings, streaming AI chat, wallet and consultation booking.
• Manage Play Store and App Store releases, push notifications, deep links, in-app payments and crash monitoring.
• Turn designs into polished, animated screens on web and mobile.

Infrastructure and quality

• Run infrastructure on AWS: deployments, Docker services, managed Postgres and Redis, monitoring and cost control. Set up CI/CD.
• Write tests for the backend and frontend, review code and keep documentation up to date.

Must have

• 2–4 years of professional development, with apps you’ve shipped to production.
• Strong Python and hands-on FastAPI (or Django/Flask), including async code.
• React Native, with at least one app published on the Play Store or App Store.
• Strong JavaScript (ES6+, modules, DOM, async code) that doesn’t depend on a framework. TypeScript and React fundamentals.
• Solid HTML and CSS: responsive, mobile-first layouts, animations, cross-browser fixes.
• Streaming APIs in the browser (SSE or fetch streams), and safe rendering of user and AI content without XSS holes.
• Web performance basics: Core Web Vitals, lazy loading, testing on real devices.
• PostgreSQL (schema design, migrations, query tuning) and Redis.
• Hands-on AWS: EC2/ECS, RDS, S3, CloudFront, IAM, CloudWatch. Docker.
• REST API design, JWT and OTP auth, and third-party APIs and webhooks.
• Git and GitHub, pull-request workflow, CI/CD with GitHub Actions.
• Can work independently and communicate clearly.

Good to have

• Experience with LLM APIs (Anthropic Claude, OpenAI, Gemini): streaming, prompt engineering, cost optimisation.
• Three.js or WebGL, and React Native animation libraries (Reanimated, Skia).
• Conversion work: GTM, Meta Pixel, link tracking parameters, A/B testing.
• Razorpay integration, and Apple/Google in-app billing rules.
• Expo/EAS, Firebase Cloud Messaging, Sentry.
• Frontend testing (Jest, Playwright) and PWA features (service workers, offline support).
• Supabase, Railway, Vercel, and Terraform or AWS CDK.
• numpy/pandas, Hindi/Devanagari typography, or an interest in Vedic astrology.

Tech stack

• Backend - Python 3.11, FastAPI, Pydantic, psycopg3, Alembic, PostgreSQL, Redis, pytest
• Web - Plain JavaScript (ES modules), HTML/CSS, Three.js, PWA, Razorpay Checkout.js, GTM and Meta Pixel
• Mobile - React Native
• AI - Anthropic Claude, Google Gemma, OpenAI-compatible gateways
• Integrations - Razorpay, MSG91, Resend, Google Maps and Sheets APIs
• Infra - Docker, GitHub Actions, AWS, Railway, Vercel and Supabase

How to apply

Send your resume, GitHub profile and links to apps you’ve published to [email protected]

Pay: ₹600,000.00 - ₹900,000.00 per year

Benefits:

• Flexible schedule

Work Location: In person