Senior Java Developer/ Tech Lead

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

Job Title: Java Full Stack Developer (React & Java )

Experience: 6 to 10 Years

Location: Pune

Notice Period: Within 15 days

Job Description:

• Looking for passionate Java Full Stack Developers with strong expertise in React and Spring Boot Microservices to join our dynamic team. If you are looking for a challenging role in a collaborative environment and are ready to join immediately, we would love to hear from you!
• Key Responsibilities:
• Design, develop, and maintain scalable web applications using Java, Spring Boot, and Microservices architecture.
• Build responsive and dynamic front-end interfaces using React.
• Collaborate with cross-functional teams to define, design, and ship new features.
• Ensure the performance, quality, and responsiveness of applications.
• Write clean, maintainable, and efficient code following best practices.
• Participate in code reviews, unit testing, and integration testing.
• Troubleshoot and resolve technical issues across the full stack.

Required Skills:

• 5+ years of hands-on experience in Java Full Stack Development.
• Strong proficiency in Spring Boot, RESTful APIs, and Microservices.
• Front-end development experience with React.js.
• Solid understanding of HTML5, CSS3, JavaScript, and TypeScript.
• Experience with SQL/NoSQL databases (e.g., MySQL, MongoDB).
• Familiarity with CI/CD pipelines, Git, and Agile methodologies.
• Excellent problem-solving and communication skills.

Founding Engineer:

As a Founding Engineer, you'll be responsible for designing, building, and launching our product to customers. Specifically,

• Since our team is lean and we plan to keep it that way - you’ll be one of the first five engineers in leading the zero-to-one journey of a product our customers are hungry for
• Lead technical design and implementation of the frontend and backend of the product with coaching and mentorship from world-class technical architects
• Have knowledge of (or learn) how to work with Shopify’s CLI
• Iterate quickly to create delightful user experiences, working closely with customers/ design partners
• Help us hire a world-class engineering team in the months ahead
• Our team is currently fully remote (with offices to be opened in Bangalore and Mumbai over next few months) and cross-border across San Francisco, Boston, and India - help us cultivate a remote-first, inclusive, diverse, and friendly culture
• Work directly with the founders with an ownership mindset

Skills and Experience:

• Prior experience working with backend tech stacks (e.g. Spring Boot, Ruby on Rails, Django, Laravel)
• Experience with service service-oriented architecture, writing REST APIs, unit testing, and architectural design
• Understanding of modern web stacks and architecture (HTTP, REST, GraphQL, WebSockets)
• Experience with SQL and NoSQL databases and other technologies (e.g. Mysql, Redis, Kafka)
• Prior experience working with frontend tech stacks (e.g. React, Angular, Vue.js)
• Prior experience working with frontend UI frameworks (e.g. Bootstrap, Tailwind CSS)

Roles and Responsibilities 

1) Understand client requirements and functionalities. 

2) Write well-designed, testable, efficient code. 

3) Responsible for solving complex technical issues. 

4) Ensure quality projects are delivered within defined timelines. 

5) Active involvement in client communication to understand functional requirements. 

6) Maintain high standards of quality for code, documentation and other deliverables. 

Required Skills 

1) Good experience in Angular/React

2) Hand on Node.JS./Express JS 

3) Database : MYSQL/MongoDB 

4) Experience in Java Script, Typescript. 

5)Good experience in HTML5, CSS3, JavaScript, Jquery 

6) Experience working in an Agile environment. 

7) Good communication skills.

Role & Responsibilities:

• Individuals are responsible for all traditional development activities analysis, design, coding, testing, and documentation.
• Add new features to existing Windows and Web-based applications in Visual Studio 2019. Interacting with internal team.
• Transform business and design needs into innovative products.
• Drive all projects to completion within deadlines.
• Perform thorough testing to find issues ahead of time.
• Engineering software needs more precise analysis & coding skillset
• Enhance skillset by working with fortune 500 clients
• Interacting with internal team.

Qualifications:

• E in computer science or related fields.
• Hand on development experience with web & database technologies (MS SQL).
• Excellent programming & communication skills Strong problem solving, judgmental, and decision-making skills.
• Ability to work at the tactical and strategic levels of IT initiatives.
• Impressive hands-on experience in .Net technologies. Impressive hands-on experience and knowledge with C#, SQL, JSON, XML, Win Forms & MVC, Angular, JavaScript, jQuery , HTML/CSS.
• Self-Motivated, flexible & Innovative

Job Location- DEHRADUN

Experience of using .NET Core framework.

·   Web development experience in HTML5, http://asp.net/">ASP.NET, C#, .NET Core, CSS3, JavaScript, Angular 2+.

·   Good experience in MVC/ Web API/ Web services.

·   Good experience in Entity framework, SQL server (Writing Complex Queries, Store Proc.) and reporting.

·   Object Oriented Programming, Design Patterns, Solid Design Principle (Mandatory For 4+ Experience).

·   Familiar with version control/ development tools such as GIT,CI/CD, Subversion, Bitbucket, TFS, Hudson, Bamboo or equivalents.

·   Agile/ Scrum development on complex applications/ products across distributed teams. Use of Jira/ Ace/ Trello (or similar tools) is essential.

·   Good exposure of client communication (voice & text chat through Skype).

·   Strong analytical skills.

Job responsibility:

• Hire and mentor a team of high-calibre front-end and Backend engineers
• Design and develop new user-facing full-stack applications.
• Building reusable components and front-end, backend libraries for future use
• Optimizing pages for maximum performance across a vast array of web-capable devices and browsers
• Optimize Backend to high scale.

Skills and Experiences:

• 6+ years of experience in software development with minimum 1 year as a tech lead.
• Experience in NodeJS, ReactJS, PostgreSQL, Redis, AWS.
• Deep understanding of at least one of React JS / Vue JS and its core principles
• Deep understanding of NodeJS.
• Experience with common front-end development tools such as babel, webpack, npm
• Familiarity with at least one code versioning tools such as Git, SVN etc.
• Good understanding of quality JavaScript code (Object oriented and commonly used design patterns)
• Capable of debugging complex issues in JavaScript
• Experience in building complex single page applications with front end and backend.
• Experience with production full stack environment debugging and DevOps experience.
• Familiarity with RESTful APIs
• Hands on coding experience.

Good to have:

• Advanced knowledge of HTML5, CSS3 and responsive web development.
• Experience with writing unit test cases with JS frameworks.
• Experience with high scalable applications.