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Job Description – Senior Backend Engineer

Position: Senior Backend Engineer / Senior Backend Developer

Experience: 5–6 Years

CTC: ₹7.5 LPA – ₹12 LPA

Employment Type: Full-Time

About the Role

We are looking for an experienced and highly skilled Senior Backend Engineer to design, develop, and maintain a scalable Python-based Core API platform.

The ideal candidate should have strong expertise in FastAPI, async SQLAlchemy 2.0, PostgreSQL, and backend architecture patterns with a focus on reliability, correctness, security, and maintainability.

You will work on a modular monolith architecture supporting multi-tenant systems, state-driven business workflows, and high-performance backend services.

Key Responsibilities

Backend Development & Architecture

• Develop and maintain backend services using:

  • FastAPI

  • Async SQLAlchemy 2.0

  • Pydantic v2

  • Alembic

• Build scalable and maintainable modular backend systems with strong architectural discipline.

• Write clean, reusable, and strictly typed Python code following best practices.

API & Business Logic Development

• Design and implement secure, high-performance REST APIs.

• Implement:

  • RBAC (Role-Based Access Control)

  • Idempotent APIs

  • RFC 7807 compliant error handling

  • Audit logging and event-driven workflows

• Ensure accurate implementation of complex business rules and KPI/reporting logic.

Database Engineering

• Design and optimize PostgreSQL schemas and queries.

• Work with:

  • B-tree indexes

  • GIN indexes

  • Partial and expression indexes

  • Query optimization and execution plans

• Handle transaction management, advisory locks, and data consistency.

State Machine & Workflow Management

• Build and maintain robust state machine workflows for core business entities.

• Ensure:

  • Idempotent state transitions

  • Reliable event publication

  • Audit-grade traceability

Code Quality & Engineering Standards

• Enforce module boundary discipline and maintain CI/CD quality standards.

• Participate in code reviews, architecture discussions, and engineering best practices.

• Maintain strong typing standards using tools such as mypy --strict.

Collaboration & Problem Solving

• Collaborate with product, frontend, and DevOps teams for seamless delivery.

• Analyze existing systems and derive business logic from legacy implementations when required.

• Support migration strategies and coexistence between evolving systems.

Required Skills & Qualifications

• 5+ years of production experience in Python backend development.

• Strong hands-on expertise in:

  • FastAPI

  • Async SQLAlchemy 2.0

  • Pydantic v2

  • Alembic

• Deep understanding of asynchronous programming in Python.

• Strong PostgreSQL expertise including:

  • Query optimization

  • Indexing strategies

  • Transaction semantics

  • Advisory locks

• Experience implementing:

  • State machines

  • Idempotency patterns

  • Audit trails

  • RBAC

• Strong understanding of backend system design and modular architectures.

• Experience with CI/CD and engineering quality standards.

Preferred Skills

• Experience with:

  • TimescaleDB

  • Continuous aggregates

  • Hypertables

• Knowledge of:

  • Domain-Driven Design (DDD)

  • Bounded Contexts

  • Multi-tenant systems

  • PostgreSQL Row-Level Security (RLS)

• Experience handling migration phases across multiple systems.

Familiarity with event-driven architectures and distributed systems