Full-Stack Mobile/Web App Developer

Company DescriptionANX Labs (formerly Antariksha Labs) is reshaping education and innovation through practical, hands-on learning. We build advanced hardware modules and a developer platform for learners, educators and professionals. Our work covers satellite-inspired and modular hardware, aerial platforms and scalable research projects. We also work closely with academic institutions, industry partners and creators to build data-driven solutions across industries.Through ANX Labs, you will work on an energy-technology venture in our ecosystem. It builds IoT metering hardware, a consumer energy app and a multi-tenant facility-management console. The product helps buildings and households see where their electricity goes, what it costs, and what is unsafe. It does this with live telemetry, tariff intelligence and AI-assisted analytics.Role DescriptionThis is a part-time, remote role for a hands-on engineer who can build, ship and lead. You will own delivery across a Flutter mobile app and a React-based web console. You will guide a small team of developers who work across both frameworks. You will also write production code yourself.You will wear several hats:Developer: build screens, APIs and data flows across mobile, web and backend.Team lead: plan sprints, review pull requests, unblock teammates and keep quality high.DevOps owner: run CI/CD, containerised deployments, environments, secrets and monitoring.Business-facing engineer: turn requirements from non-technical stakeholders and executives into scoped tasks, estimates and clear status updates.

Responsibilities

Build and maintain a cross-platform mobile app in Flutter/Dart (state management, navigation, offline caching, push notifications via FCM/APNs, deep links, app-store releases).Build and maintain a React/TypeScript web console, using Next.js or Vite, a component library, design tokens, dark/light theming, and canvas/SVG/WebGL data visualisation. It will include line, bar, heatmap, gauge and topology charts.Keep UI behaviour and shared logic consistent across Flutter and React. This covers an API client, auth and role resolution, entitlements, and formatting helpers.Design and build REST APIs with FastAPI (Python) and, where needed, Node.js/TypeScript. Use OpenAPI 3.1 contracts, Pydantic validation, versioned routes, cursor pagination, idempotency keys and problem-details error handling.Model data in PostgreSQL (Supabase). This includes schema design, migrations, indexing, time-partitioned tables, JSONB columns, views, and Row-Level Security (RLS) policies for multi-tenant data isolation.Implement authentication and authorisation: JWT/OAuth2, role-based access control (RBAC), MFA, and audit logging.Build real-time features with WebSockets, Server-Sent Events or database change subscriptions, with throttled live updates and graceful handling of stale or missing data.Work with IoT data pipelines. This means MQTT topics and QoS, message queues (RabbitMQ), idempotent ingestion, de-duplication, and late or out-of-order data. It also means a hot-state cache (Redis/Valkey) and serialisation formats such as JSON and Protobuf.Support analytics and AI features: DuckDB/Parquet queries, scheduled jobs, LLM and RAG integration (embeddings, pgvector, Ollama), and grounded, citation-backed answers.Run DevOps: Docker, Railway deployments, GitHub Actions CI/CD, environment and secret management, TLS, logging, metrics and alerting (Prometheus/Grafana, Sentry), and release management.Write unit, widget, integration and API tests (pytest, Jest/Vitest, Flutter test), enforce code-review standards, and keep technical documentation current.Present progress, risks and trade-offs to business and leadership teams in plain language.Qualifications2–5 years of professional experience in software development, with shipped production work.Working knowledge of both Flutter/Dart and React/TypeScript. You do not need to be an expert in both, but you must be able to build and review in either.Solid grounding in JavaScript/TypeScript, HTML5 and CSS3, including responsive design, Tailwind or CSS-in-JS, and accessibility basics.Backend experience with Python (FastAPI) or Node.js. You should understand async programming, REST design and API versioning.Strong SQL and PostgreSQL skills: normalisation, query optimisation, indexing, transactions and migrations.Experience with Git/GitHub workflows: branching, pull requests, code review and semantic versioning.Hands-on experience with Docker and CI/CD pipelines, and with deploying to a cloud or PaaS platform.Knowledge of Protobuf, GraphQL, Next.js SSR/SSG, PWA, Capacitor, or React Native.Familiarity with authentication and security basics: JWT, OAuth2, CORS, CSRF/XSS and secrets handling.Experience integrating third-party and external APIs: webhook handling, retries with exponential backoff and jitter, rate limiting, and idempotent writes (for example, payment gateways, weather APIs, push services).Familiarity with the medallion (bronze/silver/gold) architecture on S3-compatible object storage. This includes Parquet/Apache Iceberg tables, dbt transformations, Airflow scheduling, and querying with DuckDB or Polars.Clear written and spoken communication, including the ability to explain technical trade-offs to non-technical stakeholders and executives.Reliability and ownership. This is part-time, so we need people who commit to their hours and deliver.Bonus Qualifications: Supabase (Auth, Realtime, Storage, RLS), Firebase/FCM, or similar backend-as-a-service tools.MQTT, WebSockets or other real-time and IoT messaging experience.Redis, RabbitMQ, Celery/Arq, or background-job patterns.Data visualisation (Chart.js, ECharts, D3, Recharts, canvas/WebGL) and dashboard UX.State management: Riverpod/Bloc/Provider (Flutter) and Redux/Zustand/React Query (React).Monorepo tooling, OpenAPI/AsyncAPI, and observability (OpenTelemetry, Grafana).LLM/RAG exposure: embeddings, vector search, prompt grounding and evaluation.Interest in energy, utilities, IoT, smart meters or hardware-connected software.Prior experience mentoring juniors or leading a small project.Working Arrangement: Part-time and remote. You set your own hours inside an agreed weekly schedule, with a few overlap hours for stand-ups and reviews.Who this suits: professionals with a full-time job who want meaningful side work, and people changing careers or between roles who want a real engineering team to join. We expect commitment and consistency in either case.Compensation: ₹12,000–₹15,000 per month.Growth path: strong performers will be considered for a full-time position after 3–6 months of consistent, positive work.