
- Coordinating with the design team, apps team.
- Understanding the nature of asynchronous programming, event-based programming, its quirks, and workarounds.
- Working on system design problems, understanding various tech frameworks, what specific problems they solve, what new problems they give rise to, and architectures that work at scale.
- Taking risks, and learn quickly from your mistakes.
- Brainstorming between various approaches, doing small experiments to test hypotheses, aligning the team to follow a particular approach, being thorough in your research.
- Collaborating well with others, knowing that better solutions come from working together
- Pushing for continuous improvement to existing processes.
Desired Candidate Profile
What you need to have:- Bachelor's degree in Computer Science (or related field)
- Hands-on experience with MERN stack.
- experience in Agile/SCRUM methodology and modern tools like Jira, Slack, GitHub, etc.
- Exposure to messaging systems like Kafka/Rabbit MQ, Docker, Kubernetes, CI/CD.
- Microservices architecture, orchestration between various services, error-handling.
- Project Management, Reporting
- Insatiably curious.
- Obsessed with putting the best-in-class systems in place

Similar jobs
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.
About the Role
We are seeking a highly skilled and motivated Senior Backend Developer with strong expertise in Node.js and AWS to join our dynamic team. The ideal candidate will have solid backend development experience, with additional working knowledge of PHP and Python. Exposure to frontend frameworks like React.js and Angular will be considered a strong advantage.
Key Responsibilities
• Design, develop, and maintain scalable backend systems and APIs using Node.js.
• Deploy, manage, and optimize applications on AWS cloud infrastructure.
• Collaborate with cross-functional teams (frontend, product, QA) to deliver end-to-end solutions.
• Ensure application performance, security, and scalability.
• Write clean, maintainable, and testable code following industry best practices.
• Work with databases (SQL/NoSQL) to design efficient data models and queries.
• Integrate third-party services and APIs when required.
• Contribute to code reviews, technical discussions, and mentoring of junior developers.
• Support continuous integration and deployment pipelines.
• Troubleshoot, debug, and optimize existing applications.
Requirements
• 4+ years of backend development experience.
• Strong expertise in Node.js and hands-on experience with AWS services (EC2, S3, Lambda, etc.).
• Good working knowledge of PHP and Python.
• Strong understanding of RESTful API design, microservices architecture, and databases (MySQL, PostgreSQL, or MongoDB).
• Working knowledge of React.js and Angular is preferred.
Job DescriptionWe are seeking an experienced HubSpot CRM Developer to join our team. The ideal candidate will have a strong background in HubSpot development, integrations, and dashboard creation while working with cross-functional teams to optimize CRM functionality.
Key Responsibilities:● Develop, customize, and optimize HubSpot CRM to meet business needs.
● Integrate HubSpot with other technologies and external business intelligence tools like Power BI and Tableau.
● Build and maintain dashboards and reports to support marketing, sales, operations, and finance teams.
● Work with backend technologies (PHP, Python, Node.js, etc.) to implement integrations and automation.
● High proficiency in JavaScript.
● Develop and maintain scripts in any suitable scripting language to support CRM functionality.
● Ensure seamless data flow and synchronization between HubSpot and external platforms.
● Collaborate with multiple teams to understand data requirements and optimize CRM processes.
Requirements:● 7-10 years of relevant experience in HubSpot development and integration.
● Strong expertise in backend development using any PHP, Python, or Node.js.
● High proficiency in JavaScript and any scripting languages.
● Experience in HubSpot API integration with other platforms.
● Proficiency in dashboard and reporting tools like Power BI and Tableau.
● Ability to work independently (IC role) while collaborating with cross-functional teams.
● Must have experience in handling end-to-end projects from scratch.
● Exposure to multiple industries/domains is preferred (not limited to a single company for 5-10 years).
- Bachelor’s degree in Computer Science, Engineering, or related field.
- 3-5 years of professional experience in web development with a strong focus on JavaScript stack technologies.
- Proven experience in integrating blockchain technology into web applications, with a deep understanding of blockchain protocols, smart contracts, and decentralized applications (dApps).
- Proficiency in multisignature, multiparty computation and 3rd party Node provider integration
- Experience with public blockchain platforms such as Bitcoin, Ethereum, etc.
- Solid understanding of RESTful APIs and web services.
- Strong problem-solving skills and the ability to troubleshoot complex issues.
- Excellent communication and collaboration skills.
- Ability to thrive in a fast-paced, agile environment and adapt to changing priorities.
- Experience with continuous integration and deployment (CI/CD) pipelines is a plus.
- Experience in setting up Bitcoin core, and Geth node is a plus
Responsibilities:
Lead the design and development of sophisticated, high availability, and secured
server-side applications with a primary focus on Golang.
● Collaborate with cross-functional teams to understand requirements, architect
solutions, and deliver high-quality software products.
● Mentor and guide junior engineers, sharing your engineering expertise and best
practices to foster skill development within the team.
● Analyze and optimize performance, scalability, and reliability of existing Golang
applications, making strategic improvements where necessary.
● Design and implement automated unit and integration tests to ensure code quality,
maintainability, and stability.
● Stay up-to-date with the latest advancements in software technologies,
recommending their adoption when appropriate.
● Champion code reviews, architectural discussions, and technical documentation to
maintain high development standards.
● Troubleshoot and resolve complex issues, providing innovative solutions to overcome
challenges.
● Contribute to the recruitment and hiring process by participating in interviews,
evaluating candidates, and providing input on hiring decisions.
Requirements
Bachelor's or Master's degree in Computer Science, or a related field.
● 3+ years of experience in software development, with substantial experience in
Golang and cloud infrastructure.
● Expert-level proficiency in designing and developing high-performance, concurrent
applications with Golang.
● Experience with distributed systems, microservices architecture, and containerization
(e.g., Docker, Kubernetes).
● Solid knowledge of software testing methodologies and tools, including unit testing
and integration testing for Golang applications.
● Demonstrated ability to lead projects, collaborate effectively with teams, and mentor
junior engineers.
● Excellent problem-solving and analytical skills, with the ability to tackle complex
technical challenges.
● Having prior experience in the FinTech domain would be an added advantage.
Our young and rapidly growing team at Zycus is looking to fill out vacant positions for Lead Engineers. We are a well established SAAS based company, with 20+ years of AI legacy and experience in the industry. Once you join us, you will get to innovate and experience the latest technologies including Artificial Intelligence, Machine Learning and AWS Cloud. We are looking for candidates well versed with Java/J2EE, Spring boot, Microservices, Hibernate, JMS/ Kafka/ Rabbit and most importantly an expert in design patterns. Exposure to Cloud platform, Full stack environment and Agile methodology, would be a plus.
We are looking for curious, collaborative candidates who are willing to learn and ready to take up new exciting endeavors. You are going to work together with the team on complex innovative projects in the industry. We are basically looking for an enthusiastic candidate with a coding experience of about 5-10 years, with a hands-on experience in Software Product Development and ownership.
You could be a perfect fit if you,
- understand use cases and product requirements, can design, develop, review (code/design), unit test, module test, integration test, documentation for PDLC.
- are an expert in maintaining, enhancing, bug fixing and following standard documentation process laid down for the project.
- follow the defined PDLC process and participate in improving the process, work with cross functional team to achieve project delivery goal.
- ensure all the work meets or exceeds predefined quality standards through exhaustive testing, peer reviews SQA process standards.
- are able to build solution which is easily scalable, high speed/ real-time performance, configurable, deploy-able and secure in SaaS environment using any open source tech stack.
- are able to identify, track and mitigate risks to the product
- are responsible for planning product iterations and releasing iterations on schedule.
Requirements
- 5-10 years’ experience in Java, J2EE and associated technologies (Spring, Hibernate, Web Services, Micro Services, Spring boot)
- Technical Skills: Core Java, Advanced Java, J2EE, Exception handling, Collections, Oops, UML, Oracle, Jenkins, Maven & Linux
- Should be able to build solutions which is easily configurable, deploy able and secure in SaaS environment.
- Must have worked spring boot Extensively.
- Strong hands on development experience in Java, J2EE.
- Product development experience in agile environment will be a big plus though not mandatory.
- Highly Tech Savvy and hands-on.
- Strong evidence of a solution/product created ground up.
Product Development:
- Has in-depth knowledge on technology and end to end development processes.
- Has the ability to recommend new processes/alternatives to meet Product development requirements and rolling them out the team.
Benefits
Five Reasons Why You Should Join Zycus
- Cloud Product Company: We are a Cloud SaaS Company and our products are created by using the latest technologies like ML and AI. Our UI is in Angular JS and we are developing our mobile apps using React.
- A Market Leader: Zycus is recognized by Gartner (world’s leading market research analyst) as a Leader in Procurement Software Suites.
- Move between Roles: We believe that change leads to growth and therefore we allow our employees to shift careers and move to different roles and functions within the organization
- Get a Global Exposure: You get to work and deal with our global customers.
- Create an Impact: Zycus gives you the environment to create an impact on the product and transform your ideas into reality. Even our junior engineers get the opportunity to work on different product features.
About Us
Zycus is a pioneer in Cognitive Procurement software and has been a trusted partner of choice for large global enterprises for two decades. Zycus has been consistently recognized by Gartner, Forrester, and other analysts for its Source to Pay integrated suite. Zycus powers its S2P software with the revolutionary Merlin AI Suite. Merlin AI takes over the tactical tasks and empowers procurement and AP officers to focus on strategic projects; offers data-driven actionable insights for quicker and smarter decisions, and its conversational AI offers a B2C type user-experience to the end-users.
Zycus helps enterprises drive real savings, reduce risks, and boost compliance, and its seamless, intuitive, and easy-to-use user interface ensures high adoption and value across the organization.
Start your #CognitiveProcurement journey with us, as you are #MeantforMore
A backend developer works alongside front-end developers, full stack developers, programmers or UX specialists to create comprehensive digital solutions for business needs. They make sure the website is scalable and that it can still function when hit by large loads—be that traffic or demanding scripts. They are also tasked with
maintaining and testing existing back-end elements to ensure they’re as fast and efficient as possible. Data storage also comes under their remit, which requires them to have a good knowledge of data security and compliance.
Duties and responsibilities:
• Analyses, designs, develops, and codes REST API using NodeJS more programming languages, Web and Rich Internet Applications.
• Supports applications with an understanding of system integration, test planning, scripting, and troubleshooting.
• Assesses the health and performance of software applications and databases.
• Establishes, participates, and maintains relationships with business units, customers and subject matter experts to remain apprised of direction, project status, architectural and technology trends, risks, and functional/integration issues.
• Defines specifications and develop programs, modifies existing programs, prepares test data, and prepares functional specifications.
• Analyses program and application performance using various programming languages, tools and techniques.
• Manage staff of 2-3 & manage microservices of software most effectively and efficiently.
• Reviews project proposals evaluate alternatives, provides estimates and makes recommendations.
• Designs and defines specifications for systems.
• Identifies potential process improvement areas and suggests options and recommends approaches
System Design Concepts:
- Scaling
- API Gateway
- Microservices
- Message Queue
Qualifications:
Graduation - B. Com + IT Certification/ B.Sc. - IT / B.Sc. Comp Sc./ B.Sc. IT/ BE-IT/ BE-Comps
Technical Skills:
Oracle, SQL, Java, Node JS, REST API Debugging.
Soft Skills:
Client Management; Good interpersonal skills; Good Communication

As part of the engineering team, you would be expected to have
deep technology expertise with a passion for building highly scalable products.
This is a unique opportunity where you can impact the lives of people across 150+
countries!
Responsibilities
● Own architecture, design, development, and implementation of different modules/features of the services
● Design, develop, deploy and support web applications.
● Discover opportunities for performance improvements
● Recommend ways to improve reliability, efficiency and code quality
● Focus on continuous delivery and reducing complexity
● Carry out code reviews and manage pull requests
● Build applications based on micro-services architecture
Requirements
● Overall 1-3 years of experience in Backend development.
● B.E/B.Tech in CS or equivalent streams from institute of repute (IITs, NITs, BITs,
IIITs or equivalent)
● Strong object oriented design skills & knowledge of design patterns
● Experience designing & developing distributed systems involving multiple web services, databases (both SQL and NoSQL), caches, queues, etc. taking into consideration scalability, availability, fault tolerance, consistency, etc. of the overall system
● Well-aware of and enforces development best practices: Unit Tests, Code Reviews,
Integration Tests, CI/CD, Monitoring, Alerting, etc
• Strong Nodejs experience with knowledge and understanding of ES6/7/8.
• Experience with DevOps.
• Understanding multi-threading concepts.
• Experience with NoSQL Databases.
• Proficiency with code versioning tools, such as Git, Github, Bitbucket.
• Experience working with common project management tools and Agile
development workflow
• Ingenuity, creativity, drive and determination are a must
Responsibilities:
- Should be able to write web services for the app.
- Manage projects from conceptualization, all the way through deployments by collaborating with everyone.
- Take initiatives to optimize.
- Keep up with the latest trends and tools and keep updating.
Our Tech Stack:
- On the backend, we use Node JS
- For the frontend, we use React
Skills
Mandatory:
Nodejs, Mongo DB, Express js, AWS Experience, Experience with mail, and phone authentication.
Must have exp in kafka and integrating with other data sources










