Backend Engineer Job at Wissen (Mumbai)

Backend Engineer

Wissen

Location:
India , Mumbai

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

As our Core Backend Engineer, you are responsible for the product backend that users interact with — the APIs, data models, integrations, and business logic that power our platform. You will work closely with the founder and the rest of the engineering team, taking full ownership of the backend layer from Day 1. This is not a maintenance role — you will be designing and building systems that have never existed before in this domain.

Job Responsibility:

Design and own the core FastAPI application — schemas, auth, APIs, and business logic
Build the RAG pipeline backend — document chunking, embedding, Pinecone indexing, and retrieval APIs
Build the AI drafting module — LLM prompt chains, template APIs, and domain-specific rule engine
Implement real-time case activity processing using a Kafka-based event bus
Build case management APIs — docket sync, hearing calendar, deadline tracking, and alerts
Design and build the expert marketplace backend — profiles, booking, and payments
Build multi-stakeholder APIs with role-based access for different user types
Integrate third-party services — payments, WhatsApp notifications, e-sign, eKYC, and e-stamp
Own backend reliability — monitoring, security hardening, and data privacy compliance

Requirements:

4–6 years of backend engineering experience, with at least 2 years in a product company
Strong Python (3.10+) — you write clean, well-tested, production-ready FastAPI or Django REST code
PostgreSQL — complex schema design, query optimisation, migrations (SQLAlchemy + Alembic)
Experience building and consuming REST APIs — versioning, pagination, rate limiting, error handling
AWS — EC2, RDS, S3 at minimum
MSK or equivalent messaging experience a strong plus
Redis — caching, sessions, pub/sub
Docker and GitHub Actions — containerisation and CI/CD pipelines
Auth — JWT, OAuth2, role-based access control

Nice to have:

Experience with RAG pipelines — vector embeddings, Pinecone or equivalent vector DB, reranking
LLM integration experience — Claude / OpenAI API, prompt engineering, cost management
Kafka or AWS MSK — event-driven architecture, producer/consumer patterns
Payment gateway integration — Razorpay or equivalent
Experience with compliance-sensitive products (fintech, legaltech, healthtech)
Knowledge of India-specific APIs — Razorpay, Aadhaar eKYC, e-sign platforms

Additional Information:

Job Posted:
May 03, 2026

Employment Type:

Fulltime

Work Type:

Hybrid work

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