Our Stack

One language end-to-end. The cloud CSMS is CitrineOS (TypeScript, Linux Foundation Energy) speaking OCPP to our chargers; charger firmware runs EVerest (LF Energy) on Linux-class units and a lightweight OCPP client on MCU-class units. The app never talks to the CSMS directly — it talks to a dedicated Node + TypeScript backend-for-frontend that owns auth, tariffs, payments and a realtime session gateway.
App: React Native + Expo (EAS), TypeScript — default choice, open to a merits-based challenge from you.
Device link: BLE provisioning and local control fallback; WebSocket/push for live session data.
Backend you integrate with: Node/TypeScript BFF · GraphQL/REST · shared type definitions.
Platform underneath: CitrineOS CSMS · OCPP 1.6J & 2.0.1 · EVerest firmware · PostgreSQL· RabbitMQ.
Payments: Razorpay / UPI (autopay mandates, Scan&Charge; guest flows).

What We Are Looking For
6+ years mobile engineering; at least one connected-hardware app shipped to production (smart home, wearables, appliances, EV, medical…).




Hands-on with BLE provisioning, flaky device connectivity, and firmware/app version skew — with opinions formed the hard way.
Production realtime experience: WebSockets, push pipelines, optimistic UI, reconnection logic.
Robust React Native + TypeScript (preferred) or deep Flutter with willingness to argue the stack on merits.
Payments integration in a consumer app (UPI/Razorpay a plus).
Release ownership: store submissions, staged rollouts, crash triage, analytics.
Comfortable with ambiguity, direct work with founders, and hiring/mentoring a small team.

Nice to Have
EV charging / energy domain exposure (OCPP, EVSE, home energy) · offline-first architecture.
Expo/EAS in production · native modules (Bluetooth, background tasks) on iOS and Android.
Early-stage or founding-engineer experience.

Pay: From ₹50,000.00 per month

Perks:
Adaptable schedule

Work Location: In person

📌 Lead Mobile Engineer Kochi
🏢 Watten Power Manufacturing
📍 Kochi