Full Stack Software Development Engineer II New Bengaluru, Karnataka, India

Sigmoid; Bengaluru; On-site; INR 2,000,000 - 3,400,000; Full time

Job summary

Sigmoid is hiring a Full Stack Software Development Engineer II to build scalable, user-focused web apps. You will own frontend interfaces with React/TypeScript and robust API services using Node.js or FastAPI.

You will design relational data models in PostgreSQL, create RESTful APIs, apply SOLID principles, and contribute to testing and agile ceremonies while mentoring junior engineers on the team.

Qualifications

• 3-5 years of hands-on React, TS, Tailwind, and Shadcn UI experience.
• Server-side development with Node.js or Python (FastAPI).
• Proficiency with PostgreSQL relational databases.
• Familiarity with RESTful APIs, microservices, and CI/CD.
• Strong understanding of SOLID, design patterns, and clean architecture.
• Experience with unit/integration testing (Jest, RTL, PyTest).
• Agile/Scrum experience and ability to mentor juniors.

Responsibilities

• Design and build scalable, responsive web interfaces and services.
• Model, query, and optimize relational data in PostgreSQL; design RESTful APIs.
• Apply clean coding principles and SOLID patterns across the stack.
• Implement comprehensive tests to maintain high coverage and quality.
• Collaborate with cross-functional teams and mentor engineers.

Skills

React

TypeScript

Tailwind CSS

Shadcn UI

Node.js

Python (FastAPI)

RESTful APIs

PostgreSQL

SOLID

Jest

Agile/Scrum

Tools

Prisma

Drizzle

TypeORM

SQLAlchemy

Docker

Kubernetes

Job description

Full Stack Software Development Engineer II

Job Title: Full Stack Software Development Engineer II (SDE II)

About the Role

As a Full Stack SDE II in Sigmoid's Product Engineering team, you will take ownership of building scalable, reliable, and user-centric web applications. You will collaborate closely with product managers, designers, and system architects to drive features from design to deployment, ensuring robust frontend performance, clean backend services, and efficient database architectures.

Key Responsibilities

Full Stack Development

• Design and build responsive, high-performance web interfaces using React, TypeScript, Tailwind CSS, and Shadcn UI, backed by reliable API services using Node.js or Python (FastAPI).

Database & API Design

• Model, query, and optimize relational data structures in PostgreSQL.
• Design, build, and maintain clean RESTful APIs and microservices.

Code Quality & Best Practices

• Apply SOLID principles, basic design patterns, and clean code principles to write maintainable, scalable, and self-documenting code.

Testing & Quality Assurance

• Implement comprehensive test suites using Jest, React Testing Library, or backend testing frameworks (e.g., PyTest) to maintain high code coverage and prevent regressions.

Agile Execution

• Actively participate in Agile ceremonies (sprints, stand-ups, retrospectives, and planning) to deliver quality code incrementally.
• Partner with cross-functional teams and mentor junior engineers through constructive code reviews and technical guidance.

Requirements & Qualifications

Technical Skills

Frontend

• 3-5 years of hands-on experience with React, TypeScript, Tailwind CSS, and modern UI component libraries like Shadcn UI.

State & Data Fetching

• Experience with modern client-side state management and data-fetching libraries (TanStack Query, Zustand, or Redux Toolkit).
• Strong expertise in server-side development using Node.js or Python (FastAPI).

ORMs & Data Layer

• Experience with ORMs or Query Builders such as Prisma, Drizzle, TypeORM, or SQLAlchemy.

Database

• Strong expertise in relational database modeling, query optimization, indexing, and management with PostgreSQL.

System Design & Patterns

• Practical experience applying SOLID principles, basic software design patterns (Factory, Singleton, Observer, etc.), and clean architecture principles.

API Development

• Solid grasp of API design standards, authentication/authorization using OIDC and OAuth 2.0, and backend-frontend integration.

Testing

• Proficiency in unit, integration, and component testing using Jest, React Testing Library, and PyTest.

Methodologies

• Strong operational knowledge of Agile/Scrum software development workflows.

Culture & Mindset

Analytical & Data-Driven

• Problem-solver who relies on metrics, root-cause analysis, and objective evidence to make sound technical and design choices.
• Thrives in a fast-paced, high-growth environment, displaying high ownership, adaptability, and resilience.
• Balanced builder who can lead initiatives and mentor peers while remaining deeply hands-on in code implementation and debugging.

Communication

• Exceptional written and verbal communication skills to articulate technical concepts, align with stakeholders, and author quality documentation.

Nice to Have

Database & Caching

• Experience with caching strategies using Redis, or exposure to NoSQL databases (e.g., MongoDB).
• Exposure to GraphQL, microservices architecture, and event-driven patterns (e.g., Kafka, RabbitMQ).
• Hands-on experience with containerization (Docker, Kubernetes), CI/CD pipelines, and cloud infrastructure (AWS, GCP, or Azure).

Security & Performance

• Understanding of web security best practices (OWASP Top 10, OAuth2, JWT) and web performance optimization techniques.