Associate Full Stack Developer

Sigma Infosolutions Ltd.; United States; On-site; USD 60,000 - 90,000; Full time

Job summary

Sigma Infosolutions Ltd. is seeking an Associate FullStackDeveloper to join our team in Atlanta, US. This Junior role focuses on building and maintaining a multi-tenant SaaS platform using the PERN/MERN stack, with emphasis on Node.js, React, and scalable REST APIs.

You will collaborate with product, design, and engineering teams to deliver high-quality production-grade code. The candidate should be proficient in PostgreSQL/NoSQL, REST APIs, and modern front-end techniques; familiarity with AI

Qualifications

• Experience building multi-tenant SaaS apps using PERN/MERN stacks.
• Strong React.js with Hooks, Context API, and state management.
• Skilled in designing RESTful APIs and database design (SQL/NoSQL).

Responsibilities

• Develop, enhance, and maintain features for a multi-tenant SaaS platform using PERN stack.
• Implement tenant-aware architecture with RBAC and secure API design.
• Design and optimize scalable REST APIs and responsive front-end components.
• Integrate AI capabilities (LLM APIs, embeddings, RAG) into product features.
• Support CI/CD pipelines, cloud deployments, and environment configurations.
• Monitor logs, troubleshoot production issues, and provide Tier-1/2 support.

Skills

PERN/MERN stack

React.js

Node.js

REST APIs

SQL/NoSQL design

Git

Docker

AWS

GraphQL

AI tooling integration

Tools

Express.js

PostgreSQL

Sequelize

Prisma

Mongoose

Next.js

Redux

Zustand

Job description

Job Title: Associate FullStackDeveloper

Experience: 0-1 Years

Location (Preferred): Atlanta, US

Job Summary

Looking for a FullStackDeveloper with expertise in NodeJS, React and ability to work with Databases. The ideal candidate should be comfortable designing and developing web applications while collaborating closely with product, design, and engineering teams.

Key Responsibilities

• Develop, enhance, and maintain features for a multi-tenant SaaS platform using the PERN stack (PostgreSQL, Express.js, React.js, Node.js)
• Implement tenant-aware architecture (organization-level isolation, RBAC, secure API design, row-level data controls)
• Design and optimize scalable REST APIs and responsive front-end components
• Actively utilize AI-powered engineering tools to enable rapid prototyping, faster iteration cycles, and high-quality production-grade code delivery.
• Integrate AI capabilities (LLM APIs, embeddings, RAG-based workflows, AI assistants, automation agents) into product features
• Implement prompt guardrails, validation logic, and secure AI usage patterns
• Optimize database performance in shared-schema or shared-database SaaS models
• Support CI/CD pipelines, cloud deployments, and environment configurations (dev/staging/prod)
• Monitor logs, troubleshoot runtime issues, and resolve production defects
• Provide structured Tier-1/Tier-2 technical support during assigned shifts, including debugging tenant-specific vs system-wide issues
• Document solutions, FAQs, and technical workflows to improve customer experience and internal knowledge base
• Escalate architectural, performance, or security-sensitive issues appropriately

Required Technical Skills

• Strong experience withJavaScript based App development on PERN/MERN stack
• Expertise inReact.js, includingHooks, Context API, and state management (Redux / Zustand preferred)
• Development experience withNodeJS/NextJS
• Strong understanding ofSQL and NoSQL database design principles
• Experience in building and consumingREST APIs
• Basic knowledge ofGraphQLis a plus
• Familiarity withORMs/ODMssuch asSequelize, Prisma, or Mongoose
• Proficiency withGit, branching strategies, and code review practices
• Understanding ofDocker,CI/CD pipelines, and cloud platforms (AWS)

Nice to Have

• AWS (EC2, S3, RDS, Lambda basics)
• Docker
• Basic understanding of:

oOAuth/JWT authentication

oWeb security (OWASP fundamentals)

oLogging & observability

• Experience with ticketing systems (Jira, ClickUp, Zendesk, etc.)

Soft Skills

• Strong problem-solving and analytical skills
• Good communication and collaboration abilities
• Ability to take ownership and work independently
• Adaptable and eager to learn new technologies