Senior Backend Engineer

Locations: Bangalore & Mumbai

⏳ Experience: 3–15 Years

⚡ Notice Period: Immediate Joiners or Max 10 Days

Mandatory Skills:

✅ Strong Core Java

✅ Excellent Problem-Solving Skills

✅ Data Structures & Algorithms

✅ AI / LLM Knowledge

✅ Strong Coding Skills

Important:

Candidates must be available for a Face-to-Face Interview in Bangalore or Mumbai.

Only Immediate Joiners or candidates serving up to 10 days' notice period will be considered.

Core AI Backend Engineer – LLM Fine-Tuning

You know that moment when you don’t just debug code — you train a model, fine-tune it, and suddenly it understands your domain better than you expected? That’s the kind of magic we’re looking for.

We’re building something that turns chaotic social video data into crystal-clear business intelligence. Not just another API — but AI-backed architecture fine-tuned to our world. Systems that marketing teams thank you for, because they feel the intelligence, not just the infrastructure.

Either you feel the craft when you read this, or you don’t. This isn’t just another backend role. This is where you bring together scalable systems and cutting-edge LLMs to build something the world hasn’t seen before.

Who We Are

We’re a small, global team that ships fast. Every line of code and every model choice affects millions of video analysis requests.

Our engineers don’t just build APIs — they architect solutions, they optimize at scale, and now, they fine-tune models to make AI work in the real world. Our CPTO still codes. Our senior engineers make complexity look effortless. Our backend team sets a standard that others ask how we move so fast.

What We Need

We need someone who’s lived both sides of this life:

• Backend excellence: building high-scale, high-performance systems.
• LLM fine-tuning: hands-on with open-source models, not just calling APIs.

Someone who can sit with a requirement at 2pm and by 6pm not only has endpoints working, but also has a fine-tuned model running behind them — customized to our use case.

Your Craft

• JavaScript/TypeScript & NodeJS as core backend tools.
• Next.js for full-stack where needed.
• Rust when performance is non-negotiable.
• Golang/Python as comfortable tools of choice.
• MySQL/Postgres/Redis — wielded with intention.
• AWS ecosystem — your playground, not your puzzle.
• LLM/AI integration you’ve actually shipped.
• Open-source LLM fine-tuning experience:
• Bringing in open-source models (LLaMA, Mistral, Falcon, etc.).
• Fine-tuning/adapting them for specific domains.
• Optimizing for inference cost, latency, and accuracy.

The Reality

The work is beautifully complex. The scale is real and growing. The problems are the kind that wake you up at 3am with solutions.

If you get your energy from building backend systems and adapting LLMs to make them smarter for real-world use, you’ll probably fall in love with what we do. If you’re only interested in APIs without touching models, this won’t be your thing — and that’s completely okay.

How to Apply

If you’re reading this thinking “finally, a team that actually cares about real AI engineering” — we’d love to see something you’ve built.

Not just a resume. Show us your craft:

• An LLM fine-tuning repo.
• A domain-adapted model you worked on.
• A system design where you combined backend and AI.
• Or even a short write-up or voice note explaining what you’ve fine-tuned.

We’re genuinely excited to see what you’ve done and have a meaningful conversation about whether this could be magic for both of us.

🚀 We're Hiring! 🚀

opportunity 🌟

Looking for Backend + Flutter Developers proficient in Node, MongoDB, SQL, Google Cloud, Flutter, MVVM, Provider. Interested?

Fill this Google form for this Opportunity 🔥

https://forms.gle/1hLJ5g55TtvyJwnG8

salary = 5k to 20k

Remote work

Join WhatsApp group for furthur hiring task

Given in Google form.

• Core knowledge of PHP and Laravel frameworks

• Fundamental understanding of front-end technologies like HTML5, CSS3, and JavaScript. Check if the CSS, HTML, and JavaScript are accurate and consistent across different apps

• Basic knowledge in SQL and NoSQL databases is a plus.

• Build and maintain innovative web applications and websites using modern development tools.

• Document and continuously update the development process, project components, and task progress based on Organization requirements

• Solid experience working with PHP, the latest Laravel version.

• Design and maintain databases.

• Optimize performance by performing UI and back-end tests

• Scale, expand and improve our websites and applications, Perform debugging and troubleshooting on apps.

• Effectively communicate with clients and other teams when needed

• Update on current industry trends and emerging technologies and apply them to the development process

Rejolut is among the fastest-growing and award winning Tech companies working on leading technologies namely Blockchain, Machine Learning & Artificial Intelligence, Complex mobile & Web Apps, IoT, etc.Rejolut is a venture-backed company with clients in over several countries namely Malaysia Airlines,gba global,my-earth,biomes, Dlg-hub,etc.

We are looking for Tech geeks having hands-on experience and in love with building scalable, distributed and large web/mobile products and tech solutions. He/She must be an excellent problem solver with passion to self-learn and implement web technologies (frontend + backend). He/She would be responsible for the architecture design, code review, and technology build and deployment activities of the product. 

Responsibilities:-

- Own the product development from scratch.

- Architect scalable, distributed and large-scale web and mobile solutions from scratch.

- Code for fresh development and to troubleshoot and resolve issues.

- Writing reusable, testable, and efficient code.

- Creating database schemas that represent and support business processes.

- Design and implementation of low-latency, high-availability, and performant applications.

- Able to learn & implement new technology/framework/library at God Speed.

- Customer-focused, react well to changes, work with teams and be able to multitask.

- Experience and knowledge of open-source tools and frameworks, broader cutting edge technologies around server side development. 

Desired Candidate Profile:-

- A Bachelor's degree in Computer Science or related field(or combined with related experience)

- Strong Expertise in Node.js/Javascript

- Hands-on experience in writing Node.js applications

- Deep knowledge of Restful APIs, Web Services, command-line programs and solid design principles.

- Knowledge of Node.js and frameworks like Express.js,Sails.js,StrongLoop, Meteor,Loopback.js, etc

- Knowledge of SQL and NoSQL database(MongoDB)

- Knowledge of tools like Docker, Git, Postman, JSdocs, etc.

- Well versed with front-end technologies - HTML5, and CSS3, AWS, GCP, Azure, Good hold on CLI command, OS

- Proficiency in multiple programming languages, both dynamic(Javascript, Python, Ruby, etc.) and strongly typed object-oriented language.

- Implementing automated testing platforms and unit tests.

- Must be a proven performer and team player that enjoys challenging assignments in a high energy, fast growing and start-up workplace.

- Good communication and interpersonal skills

Rejolut - As a Career Differentiator

 - We are a young and dynamic team who are obsessed with solving futuristic and evolutionary business problems at scale with the next generation technology like blockchain, crypto and machine learning. Focuses on empowering people across the globe to be technically efficient, making advancements in technology and providing new capabilities that were previously thought impossible.

- We provide exposure to higher learning opportunities so that you can work on complex and cutting edge technology like React, React Native, Flutter, NodeJS, Python, Go, Svelte, WebAssembly. Strong expertise in  blockchain and crypto technology and working with the networks like Hedera Hashgraph, Tezos, BlockApps, Algorand, Cardano.

- We maintain high end transparency with clients and employees as Visibility unlocks Efficiency and trust unlocks Visibility.

- Company is backed by two technology Co-founders, well-versed with consumer applications and their work has been downloaded millions of times and have led teams in leadership positions in companies like Samsung, Purplle, Loylty Rewardz.

Benefits :

> Health Insurance

> Work from Home

> Fast growth and more visibility into the company

> Experience to work on the latest technology

> Competitive Learning Environment with supportive co-workers

> Employee friendly HR Policies

> Paid leaves up to certain limits

> Competitive salaries & Bonuses

> Liberal working atmosphere

> Get mentored by the best in the industry

Schedule:

- Day Shift/Flexible working hours

- Monday to Friday

What will we be building together?

1K Kirana Bazaar (1K) is building Bharat's first hyperlocal offline-online distribution platform. Our aim is to provide the benefits of technology and scale to the underserved first time internet users of Bharat. We use the efficiencies of the existing kirana store network and empower them with a full technology stack to fulfill all needs of our consumers.

Over the next 2 years our goal is to transform the lives of millions of new age consumers of Bharat and at the same time make the lives of thousands of retailers more fulfilling! With our end to end integrated supply chain and technology stack, we are already disrupting the traditional supply chain and bringing in innovation and gamification to the traditional shopping and consumption process. The growth process will demand exploration of technologies like Blockchain, Artificial Intelligence, IPFS, Distributed Computing, and IOT to name a few to fuel the idealistic model design for the making of an evolved #bharat. We visualise seamless access to every consumer or a mom & pop store in the deepest rooted corners of India.

What will you be driving with the team?

To build full-stack solutions for retail & supply chain from managing purchases to selling products to end consumers. You will work on solving some of the complex problems of the retail industry.

Your core responsibilities:

• Solve complex problems and follow good coding practices and complying with existing quality standards.
• Evaluate existing engineering processes and recommend improvements.
• Setup high-quality standards in production running code by performing diligent code reviews and rigorous unit test coverage.
• Brainstorm (sometimes, even prototype) features with the rest of the team based on your knowledge of the codebase.
• And of course, there's always bugs to fix, based on your personal experience or feedback from the team and the 1K community.

What will help you thrive in this role? 

• A bachelor’s degree in Computer Science or a related field is preferred.
• 6 month+ experience in software development.
• Knowledge of programming languages.
• Should possess a solid grasp of object-oriented programming, data structures, and software design.
• Experience with AWS infrastructure and distributed systems is a plus.
• Highly developed attention to detail.
• Ability to work well in a fast-paced environment.

Whom you will be sharing your workday with?

We are a language-agnostic engineering team of independent thinkers who understand the priorities of a rapidly growing startup and excel at choosing high impact projects. Our core beliefs are: 

• We are at the forefront of disrupting the traditional retail & supply chain industry by building distributed systems
• We are hardcore open source lovers and believe in the strength of the open-source community.
• We believe technology can change the way information is consumed.
• We use a data-driven approach to build new products and features.
• Build new tech solutions to improve business processes and enable our various departments to help service our teams better.
• We embrace and enable DevOps culture within the organisation.

And yes! We do have new furry friends coming to our office every day.

Work Perks

• Hybrid work environment with flexibility to work from anywhere. 
• A great salary, commensurate with experience.
• Unlimited vacation policy which means Paid Vacations.
• A relaxed & flexible working atmosphere.
• Weekly parties (Unofficial).
• Paid outings to remote work locations and industry events/conferences.
• Paid Health Insurance for you and your loved ones.

• Experience of using Python/ Django frameworks in building back end for Full Stack Applications
• Hands on experience on Web frameworks, Restful APIs and SOAP
• Strong command on SQL (or relevant query language or ORM queries)
• Knowledge of front-end technologies such as React Native, React.js, Angular.js or Javascript

• PHP Web Development experience - Core PHP and PHP frameworks.
• Strong knowledge of PHP web frameworks {such as Laravel, Yii, etc depending on your technology stack}
• Should have positive and adaptive behavior. Strong knowledge of the common PHP or web server exploits and their solutions
• Basic understanding of front-end technologies, such as JavaScript, HTML5, and CSS3
• Understanding client requirements & functional specifications
• Developing and maintaining dynamic websites and web applications
• Ensuring foolproof performance of the deliverable
• Must be proficient in PHP, MySQL, CSS, HTML, JavaScript, AJAX, XML
• Experience with Joomla, WordPress, Drupal, Magento would be added advantage.
• Must have the capacity to work independently and as a part of a team
• Eager to learn new web technologies

• 2-5 years of work experience, preferably in a startup
• An engineering degree preferably, from a top-tier school (or equivalent experience)
• Hands-on experience in developing end-to-end applications using Node.Js, ReactJs,
• Knowledge of HTML/CSS, web standards, best practices
• Experience of working with databases - MySQL, MongoDB
• Good understanding of asynchronous request handling, partial page updates, and AJAX
• An experience in writing clean, semantic code with cross-browser compatibility in mind
• Proficient understanding of code versioning tools, such as Git/SVN
• Excellent coding and debugging skills
• A passion and the ability to make beautiful, smooth, delightful web experiences
• A Will-Do attitude

• A team of aces, from top-tier schools and startups, to work with
• A fast-paced, data-driven, and fun work environment
• A huge appetite for new, disruptive, creative and implementable ideas
• An open work culture

• Competitive salary
• Great working environment, opportunity to work directly with the founders on very exciting real-life problems.
• Opportunity to grow really fast.
• Opportunity to hire a team & mentor them in the future.
• ESOPs

• Shortlist
• Intro call of 15min
• 1-2 Tech rounds
• HR round
• Offer rollout