MERN Stack Developer

Senior AI Engineer — Ruby on Rails

Techjays · Coimbatore / Chennai · Hybrid · Immediate – 30 Days Notice

About Techjays

We're the AI Reimagination Company — and that's not a tagline we put on a deck. It's what we actually do.

Techjays helps global enterprises rebuild the way they operate using AI at the core: not as a pilot, not as a feature, but as a foundational layer across products, workflows, and infrastructure. We're an Anthropic partner, which means our engineers get early access to frontier models and tools before they hit the market.

Our team includes engineers and leaders from Google, Akamai, NetApp, ADP, Cognizant Consulting, and Capgemini. We run like a high-agency startup, but we build production systems that real enterprise clients depend on.

Every project is greenfield. Every line of code you write ships.

What This Role Actually Is

This isn't a "keep the monolith alive" job.

You'll be designing and building new AI-powered features, integrating LLM APIs into production Rails applications, and using Claude Code as a core part of your daily workflow — not as an experiment. You'll work directly with US-based enterprise clients alongside Product Managers, AI Business Consultants, and Delivery Excellence Managers.

Your architecture decisions will have visible business impact.

What You'll Own

• Design, build, and maintain production-grade Ruby on Rails applications for US enterprise clients — from architecture to deployment
• Integrate LLM APIs (Claude, GPT-4, Gemini) into the Rails stack, building AI-powered features that drive real business outcomes
• Use Claude Code daily as your AI development partner — for generation, debugging, documentation, and velocity
• Build responsive, performant React front-ends from wireframes and design specs
• Own RESTful and GraphQL API design for client applications and third-party integrations
• Drive database design and optimisation — schema, queries, indexing, and migrations on PostgreSQL/MySQL
• Lead code reviews and raise the technical bar through constructive feedback
• Document architecture decisions, API contracts, and implementation patterns

Must-Haves

• 6+ years of deep, production-grade Ruby on Rails experience — advanced framework patterns, background jobs (Sidekiq/Redis), design patterns, best practices
• Hands-on experience with Claude Code (Anthropic) for AI-assisted development — this is central to how we build
• Strong React skills — hooks, component architecture, state management, wireframe to production
• Expert-level PostgreSQL/MySQL — schema design, query optimisation, indexing, performance tuning
• Proven experience designing RESTful and GraphQL APIs at scale
• Experience integrating third-party LLM APIs (OpenAI, Anthropic, Google Gemini) into production Rails apps
• Strong software architecture fundamentals — MVC, service objects, design patterns, testability
• Deep comfort with Git, Gitflow, and PR-based collaboration workflows

Good to Have

• Python for scripting, automation, or backend service integration alongside Rails
• AWS familiarity — EC2, S3, RDS, Lambda — for deployment and infrastructure
• MongoDB or NoSQL in polyglot persistence architectures
• Vector databases (Pinecone, pgvector, Weaviate) for LLM application development
• LangChain, LangGraph, or similar orchestration frameworks for AI agents
• SaaS multi-tenancy patterns and high-traffic web application experience
• Open source contributions or a strong public GitHub profile

Why Join Techjays

• Claude Code is standard practice here, not a side experiment — you'll use it every day to ship faster and smarter
• Anthropic partner access — early visibility into frontier AI tools and capabilities before the market sees them
• Greenfield only — you'll design architecture, not inherit technical debt
• Global client exposure — your engineering decisions translate directly to measurable business outcomes for US enterprise clients
• Team pedigree — you'll learn alongside engineers who've shipped at real scale at Google, Akamai, and NetApp
• AI is the product here, not a feature. You'll spend your career at the intersection of software engineering and AI systems

What We're Looking For Beyond the Resume

• Builder mindset — you think in systems, not tickets
• Ownership — you take features from idea to production
• Structured thinking in ambiguous, fast-moving environments
• Clear communicator, collaborative team player

What We Offer

• Competitive compensation
• Hybrid work — Coimbatore office or remote flexibility
• Paid holidays and flexible time off
• Medical insurance for self and family (up to ₹4 Lakhs per person)
• Opportunity to work on production-grade AI systems for global clients
• A culture built on clarity, integrity, and continuous growth

Location: Coimbatore / Chennai — Hybrid Notice Period: Immediate to 30 days preferred

Role Overview:

We are looking for a detail-oriented and experienced Full Stack Developer to join our growing team in India. This is a remote, full-time opportunity to work on high-impact

projects using modern web technologies. While specific project discovery is underway, we’re looking to onboard developers with a solid foundation across front-end and back-end technologies who are comfortable working in agile environments. You will be collaborating directly with a US-based client and must be available to work the UK shift.

Key Responsibilities:

·        Develop and maintain scalable and performant full-stack web applications

·        Collaborate with UI/UX designers and backend teams to implement responsive, user- friendly interfaces

·        Write unit tests using Jest and ensure code quality and reliability

·        Develop RESTful APIs using Node.js and NestJS framework

·        Utilize Docker Compose for local development and deployment

·        Manage and optimize MySQL databases, including views, stored procedures, and performance tuning

·        Implement access control mechanisms using identity providers like Okta or Auth0

·        Document APIs using tools like SwaggerUI and Postman

·        Participate in sprint planning, code reviews, and team stand-ups via JIRA and Confluence

·        Use Git for version control and manage merge requests and branches effectively

·        Integrate application loggers for monitoring and diagnostics

Must-Have Skills:

·        Proficiency in HTML, CSS, SASS/SCSS

·        Strong hands-on experience with Angular 18 or higher

·        Familiarity with Angular Material or similar UI component libraries

·        Experience with Node.js and NestJS 10+

·        Working knowledge of Docker Compose

·        Strong SQL skills and experience with MySQL

·        Understanding of authentication and authorization best practices with Okta, Auth0, etc.

·        Comfort using Postman, SwaggerUI, Git, and logging tools

·        Familiarity with agile development processes and using JIRA and Confluence

Nice to Have:

·        Experience with form builders like Formsite or FormSort

·        Knowledge of data encryption best practices

·        Prior experience in the public health or POSIT (Public Health Informatics) domain

Qualifications:

·        Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field

·        3–6 years of experience in full-stack development

·        Strong communication skills and the ability to work independently in a remote team environment

Availability to work UK shift hours to ensure overlap with the US-based client

Equal Opportunity Statement:

BigRio is an equal-opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, national origin, sex, sexual orientation, gender identity, age, pregnancy, status as a qualified individual with disability, protected veteran status, or other protected characteristic as outlined by federal, state, or local laws. BigRio makes hiring decisions based solely on qualifications, merit, and business needs at the time. All qualified applicants will receive equal consideration for employment.

1. Must have Experience in React, Nodejs.
2. Experience with the CI Systems.
3. Experience with any of the Cloud Platforms Such as GCP,AWS.
4. Experience with Continuous Integration environments.
5. Experience in end-to-end testing frameworkS Like Puppeteer / Cypress / Protractor/ Other selenium testing framework.
6. Experience with JavaScript Unit Testing Frameworks Like Jest/Mocha.
7. Experience in TypeScript.

We are looking for a driven, talented full-stack developer, obsessed with coding to join our development team. We have been called the hottest SaaS startup in the interior design space many times, so if you join us, you’ll have the rare opportunity to build a product like Canva from scratch! Not just that, you’ll get to learn various exciting technologies that power products like Figma. 

So if you’re smart, curious about new digital technologies, and moonstruck about the quality of your code: You have a love-hate relationship with code bugs – you hate to see them, but if they do pop up once in a while, you are amazingly efficient at throwing them out of your code, with love. - this job is yours!

Requirements:

• 3 years experience on MongoDB, Express, VueJs/ react.js and NodeJs(MEVN stack)
• Hands-on with JavaScript with detailed knowledge of browser peculiarities
• working experience on Node.js/Python/Java, on the server; Express JS; MongoDB and VueJs/react.js/NuxtJs on client side.

Oh and just like everyone else, we love bonuses too. Any work experience in the below would be a sweet add on:

• Experience with cloud technologies such as AWS

• Creating robust and secure RESTful web services in XML and JSON, JavaScript, jQuery

JavaScript, jQuery, Angular or node, HTML, CSS, API consumption, DB knowledge, building responsive web apps.