Senior Python Developer

Location: Bangalore, India

Experience : 5-20 years

Employment Type: Full-time or Contract

Department: Engineering

Reports To: Engineering Manager / Technical Lead

About NexGen Architects:

NexGen Architects is a London-based firm with a global reach, specializing in MuleSoft for seamless integration projects that support our clients' businesses in operating more effectively. Our hands-on experience is demonstrated through the success of integration solutions tailored for each client.

We offer a full range of services to our clients, focusing on:

• Integration Architecture - Ensuring systems work together seamlessly
• Solutions Architecture - Addressing each business's unique challenges
• Enterprise Architecture - Aligning technology strategies with business needs

Our approach includes the availability of "Hands-On Architects" and the flexibility of "On-Demand Architect hiring" in MuleSoft, providing the right expertise when it's needed.

Website:

Role Overview:

We are looking for a Senior Python Developer to join our engineering team building enterprise-grade backend services and APIs. You will work on scalable, multi-tenant microservices with a focus on performance, reliability, and security.

In this role, you'll work in an AI-augmented development environment where AI tools assist with routine coding tasks, allowing you to focus on:

• System architecture and design decisions
• Complex algorithm design and optimization
• Database design and performance tuning
• Security architecture and compliance
• Code review and quality assurance
• Technical mentorship of junior developers

Key Responsibilities

1. Backend Development

Core Development Work:

• Build high-performance REST APIs using FastAPI/Django
• Design and implement microservices architecture
• Create efficient database schemas and queries (PostgreSQL)
• Implement caching strategies with Redis
• Build event-driven systems with message queues
• Write comprehensive unit and integration tests

Technical Standards

• Follow Python best practices (PEP 8, type hints)
• Achieve 80%+ test coverage with pytest
• Ensure API response times < 200ms (p95)
• Zero critical security vulnerabilities
• Multi-tenant data isolation enforced

2. Architecture & Design

Technical Leadership:

• Design scalable microservices architectures
• Create database schemas with proper normalization and indexing
• Define API contracts using OpenAPI/Swagger specifications
• Design event-driven architectures (pub/sub, CQRS, Event Sourcing)
• Create Architecture Decision Records (ADRs)
• Evaluate and recommend technologies and frameworks

Key Decisions You'll Make:

• Database patterns (CRUD vs CQRS vs Event Sourcing)
• Multi-tenant data partitioning strategy
• Caching approach (Redis, CDN, in-memory)
• Message queue selection (RabbitMQ, Kafka, Azure Service Bus)
• Resilience patterns (Circuit Breaker, Retry, Bulkhead)

3. Production Readiness & Quality

Quality Assurance:

• Review pull requests for code quality, security, and performance
• Validate OAuth 2.0, RBAC implementation
• Optimize database queries and prevent N+1 issues
• Ensure comprehensive logging, metrics, and tracing
• Review and improve test coverage

Quality Gates:

• 80%+ test coverage (unit + integration)
• Zero critical security vulnerabilities (OWASP Top 10)
• API p95 latency < 200ms
• Database queries < 100ms
• Zero hardcoded credentials
• Multi-tenant RLS (Row-Level Security) enforced

4. Collaboration & Mentorship

Team Collaboration:

• Work with frontend engineers on API contracts
• Collaborate with DevOps on deployment and monitoring
• Mentor junior developers on Python best practices
• Participate in sprint planning and retrospectives
• Share knowledge through documentation and tech talks

Required Technical Skills:

Core Technologies (Must Have)

Python Development:

• Python 3.10+ with async/await
• Type hints and mypy for static typing
• Decorators, context managers, generators
• Virtual environments and dependency management

Web Frameworks:

• FastAPI (preferred) or Django REST Framework
• Dependency injection patterns
• Async request handling
• Middleware and authentication.

Databases:

• PostgreSQL: Schema design, indexing, CTEs, window functions
• SQLAlchemy ORM with async support
• Alembic for database migrations
• Row-Level Security (RLS) for multi-tenancy
• Query optimization and EXPLAIN ANALYZE

Caching & Queues:

• Redis: Caching, pub/sub, distributed locks
• Message queues: RabbitMQ, Celery, or Azure Service Bus
• Background task processing

Testing:

• pytest with fixtures an parametrization
• Integration tests with real databases (NO MOCKS)
• Test coverage tools (coverage.py)
• API testing with

Cloud & Infrastructure (Must Have)

Azure Cloud:

• Azure Container Apps or App Service
• Azure Event Grid for event-driven architecture
• Azure Key Vault for secrets management
• Azure PostgreSQL Flexible Server

DevOps:

• Docker: Multi-stage builds, image optimization
• CI/CD: Azure DevOps or GitHub Actions
• Infrastructure as Code (Terraform basics)

Observability:

• Structured logging (JSON logs)
• Metrics and monitoring (Prometheus, Grafana)
• Distributed tracing (OpenTelemetry)
• Alerting and dashboards

Security (Must Have)

• OAuth 2.0 and JWT authentication
• RBAC/ABAC authorization patterns
• OWASP Top 10 prevention (SQL injection, XSS, CSRF)
• Secrets management (no hardcoded credentials)
• Data encryption (at rest and in transit)

Nice to Have

• AI/ML frameworks (LangChain, LangGraph, OpenAI API)
• GraphQL with Strawberry or Ariadne
• Kubernetes and Helm charts
• Kafka for event streaming
• Elasticsearch for search
• MuleSoft or other integration platforms
• Salesforce API integration
• Microsoft 365 / Graph API integration

Required Experience

Must Have (5+ years):

1. Python Development: 5+ years building production Python applications

2. Web APIs: 4+ years with FastAPI/Django/Flask (REST API design)

3. PostgreSQL: 4+ years with schema design, optimization, migrations

4. Cloud Platforms: 2+ years with Azure/AWS/GCP

5. Multi-Tenant SaaS: 2+ years building SaaS with tenant isolation

6. Testing: 3+ years with pytest, 80%+ coverage requirements

7. Production Systems: Experience with 99.9%+ uptime systems

Nice to Have:

• Experience with AI-assisted development tools (GitHub Copilot, Claude)
• AI/ML: LangChain, LangGraph, RAG systems
• MuleSoft Certified Developer
• Enterprise integration experience (Salesforce, SAP, Microsoft 365)
• Event-driven architecture (Kafka, Event Grid)
• Certifications: Azure Developer, AWS Developer, etc.

Required Mindset & Soft Skills

Critical Attributes:

1. Production-First Thinking

• Obsessed with reliability, security, and performance
• Think in terms of SLAs, uptime, disaster recovery
• Proactive about error handling and monitoring
• Zero tolerance for security vulnerabilities

2. Quality-First Approach

• Write clean, maintainable, testable code
• Thorough testing with real infrastructure
• Constructive and detailed code reviews

3. Systems Thinking

• Understand distributed systems challenges
• Consider scaling, failure modes, and recovery
• Balance trade-offs (consistency vs availability)

4. Continuous Learner

• Stay updated with Python ecosystem
• Learn new frameworks quickly
• Share knowledge with the team

5. Effective Communicator

• Clear technical documentation
• Explain complex concepts simply
• Mentor and support junior developers

Day-to-Day Activities

Sprint Planning:

• Review user stories and technical requirements
• Design database schemas and API contracts
• Estimate effort and identify dependencies
• Write High-Level Design documents

Development:

• Implement API endpoints and business logic
• Write database migrations
• Write unit and integration tests
• Review pull requests from team members
• Debug and optimize performance issues

Review & Ops:

• Complete code reviews
• Monitor production dashboards
• Address technical debt
• Update documentation
• Participate in retrospectives

Production Support:

• Monitor alerts and respond to incidents
• Investigate and fix production issues
• Optimize slow queries and endpoints

How to Apply

Interested candidates can apply through this LinkedIn post. Please ensure your profile is updated with relevant experience and qualifications.

What makes a strong application:

• GitHub profile with Python projects
• Open source contributions
• Technical blog posts
• Production system experience

Why Join Us?

1. Technical Excellence

• Work on challenging distributed systems
• Modern tech stack with Python 3.12+ and FastAPI
• Focus on quality, security, and performance

2. Growth Opportunities

• Clear career progression path
• Learning budget for certifications
• Mentorship and leadership opportunities

3. Great Team Culture

• Collaborative environment
• Knowledge sharing and tech talks
• Work-life balance prioritized

4. Impactful Work

• Build products used by enterprises
• Solve real scalability challenges
• Work with cutting-edge AI tools

Status: Actively Hiring Positions Available: 3-4 Senior Python Developers

Equal Opportunity Employer: We are committed to diversity and inclusion. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

We value: Innovation, Quality, Collaboration, Ownership, Growth Mindset, Work-Life Balanc