
Roles & Responsibilities
What You'll Do
• Design and build the core Node.js services and REST APIs from scratch, built to scale as we grow.
• Own system design end to end: service boundaries, data flow, caching, queueing, failure modes, and scale.
• Ship AI/ML-powered features, including LLM and agentic capabilities.
• Use LLMs and agentic tooling across the SDLC, from design and code generation to testing and debugging.
• Model data and optimize SQL/NoSQL queries for performance; integrate with third-party platforms.
• Debug production issues, own reliability, and set the engineering standards the rest of the team will grow into.
Ideal Candidate
What You'll Bring
• Experience: 6+ years building production backend systems in Node.js for B2C products at meaningful scale.
• System Design: This one matters a lot to us. You can reason clearly about scalability, reliability, and trade-offs under real constraints.
• Fundamentals: Strong grasp of API design, service-oriented architecture, data structures, algorithms, and clean code.
• Databases: Depth in SQL and/or NoSQL, data modeling, query optimization, and performance tuning.
• AI-Native: You already use LLMs and agentic approaches to maximize your own efficiency as an engineer.
• Mindset: You enjoy the pace and breadth of a small team, and you are happy picking up whatever moves the product forward.

About TalentXO
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Senior Backend Engineer
Node.js, System Design & Production Platforms
📍 Mumbai (On-site) | Full-time | 5+ years
About the Role:
Unico Connect is an AI-first technology partner that builds custom mobile, web, and AI products for clients across multiple geographies.
We are hiring a Senior Backend Engineer to own the backend architecture of a complex production AI platform on a dedicated client engagement: API design and data modelling, multi-tenancy, orchestration of long-running agent workloads, and the services that manage user projects and generated output.
We are open to full stack engineers whose primary strength and interest is backend. If you have shipped full stack work but the backend is where you do your deepest engineering, you are a fit for this role.
The mandatory requirement for this role is hands-on production experience as a senior backend engineer building complex, scalable systems in Node.js, with end-to-end ownership of architecture, data, and operations on at least one live platform.
The role is hands-on and architectural.
Expect to design system architecture, lead a small group of backend engineers, build the hardest parts yourself, set engineering standards, and partner closely with frontend, AI, and DevOps engineers.
A typical week includes an architecture decision on a new service, hands-on implementation of a critical path, a code review with mid-level engineers, and a working session with the AI engineer on an integration contract.
Responsibilities:
System Architecture
Own the backend architecture across engagements.
Make and document decisions on service boundaries, data models, API contracts, deployment topology, and trade-offs.
Hands-on Backend Delivery
Lead by example on complex modules, performance-critical paths, and high-risk areas using Node.js (Express, NestJS, Fastify) with TypeScript.
Pick up Python (FastAPI) where engagements require it.
Database Design and Performance
Drive PostgreSQL schema design, indexing, query optimisation, migrations, and capacity planning.
Set the data-modelling standard across the pod.
Caching, Queues, and Workflows
Design caching (Redis), event-driven patterns (Kafka, RabbitMQ, SQS, NATS), and long-running workflow orchestration (Temporal, BullMQ, Celery, or equivalent).
Handle retries, idempotency, and failure recovery.
Multi-Tenancy and Platform Patterns
Design and implement multi-tenant data isolation, RBAC, audit logging, and resource quotas appropriate to enterprise-grade products.
API and Integration Design
Set the standard for REST, GraphQL, and gRPC contracts.
Drive versioning, authentication (OAuth, JWT, SSO), security by default, and developer ergonomics.
Observability and Operations
Instrument services with OpenTelemetry, Prometheus, and Grafana.
Define SLOs, lead incident response, and write postmortems.
Code Quality and Mentorship
Run code reviews, define conventions, mentor mid-level engineers, and raise the engineering bar.
AI-Assisted Engineering Discipline
Use Claude, Cursor, and similar tools day to day.
Set the team standard for prompts, patterns, AI-assisted review, and validation of AI-generated backend code.
Client Engagement
Represent Unico Connect in technical conversations with customers.
Defend architectural decisions, communicate trade-offs, and manage scope.
Requirements:
Hands-on Production Experience as a Senior or Lead Backend Engineer in Node.js (Mandatory)
Must have personally built and shipped complex production systems in Node.js, owning architecture, data, and operations on at least one live engagement.
Full stack engineers whose deepest work is on the backend qualify.
POCs and internal tools alone do not qualify.
5+ Years of Professional Backend Engineering Experience
With at least 1 to 2 years in a senior or lead role with direct responsibility for technical decisions and team output.
Deep Node.js and TypeScript Proficiency
Strong with Express, NestJS, or Fastify.
Comfort with async patterns, streams, worker threads, and performance profiling.
Python as a Strong Plus
Hands-on production experience with FastAPI, Django, or Flask is a meaningful advantage.
Willingness and demonstrated ability to pick up Python as engagements demand is required.
PostgreSQL Depth
Schema design, normalisation, indexing, query performance, migrations, and at least one production system where you owned the data model end to end.
Caching and Event-Driven Architecture
Hands-on with Redis (or equivalent) and message queues or event-driven patterns (RabbitMQ, SQS, Kafka, NATS).
AWS Depth
Hands-on production experience with EC2, S3, RDS, IAM, VPC, ECR, and at least one of EKS, ECS, or Lambda.
Comfort owning deployment, monitoring, and cost.
System Design and End-to-End Ownership
Able to take an ambiguous problem, break it into components, evaluate alternatives, produce an architecture that holds up under review and load, plan execution, and ship with limited supervision.
AI-Assisted Engineering Experience
Daily use of Claude, Cursor, Copilot, or equivalent.
Strong discipline for reviewing and validating AI-generated backend code.
Excellent Written and Spoken English
Experience working directly with international clients.
Confident defending architectural choices in writing and in review.
Nice to Have:
- Workflow orchestration (Temporal, Airflow)
- GraphQL (Apollo, gRPC)
- Sandboxed execution environments
- Multi-tenant SaaS experience
- OpenTelemetry instrumentation
- Prior agency or consulting experience
About the Role
We are seeking a highly skilled Tech Lead who can drive the development of high-performance, scalable products while contributing hands-on to coding, architecture, and system design. You will work closely with a small engineering team, guiding them in technology decisions, quality delivery, and best practices while also taking ownership of key modules yourself.
Key Responsibilities
- Lead end-to-end product development from design to deployment.
- Act as both a technical contributor and mentor within a small, agile team.
- Architect scalable, robust, and secure backend and frontend systems.
- Participate in and guide:
- System design & architecture decisions
- Algorithmic analysis and performance optimization
- Database modeling and API design
- Write clean, maintainable, high-quality code.
- Own deployment pipelines and ensure reliable production releases.
- Collaborate with cross-functional stakeholders to translate requirements into actionable technical plans.
- Conduct code reviews, enforce coding standards, and ensure engineering excellence.
- Troubleshoot and solve complex technical challenges in production environments.
Required Technical Skills
- Strong expertise in Node.js and/or Python.
- Hands-on experience with TypeScript and React.js for frontend development.
- Knowledge of Go (Golang) is a strong advantage.
- Deep understanding of:
- Data Structures & Algorithms
- System Design
- Distributed systems concepts
- Microservices architecture
- Experience with deployment using:
- Docker, Kubernetes, or similar orchestration tools
- CI/CD pipelines
- Cloud platforms (AWS / GCP / Azure)
- Strong understanding of databases (SQL and NoSQL).
Soft Skills
- Strong leadership and ability to guide a small development team.
- Clear communication with technical and non-technical stakeholders.
- Ownership mindset with focus on delivering quality, on time.
- Problem-solver with the ability to make quick and correct technical decisions.
Preferred Qualifications
- 4–10 years of experience in software development.
- Prior experience in a startup or fast-moving product environment.
- Experience deploying and managing real-world products at scale.
What We Offer
- Opportunity to build and influence real products end-to-end.
- A collaborative, high-ownership environment.
- Freedom to experiment and drive product and engineering decisions.
- Deployment and production support.
- Strong knowledge of SQL database and experience in writing queries with and without ORM.
- Designing and creating RESTful APIs for internal and partner consumption
- Experience of code versioning tools, such as Git, Bitbucket, Github
Job Summary:
We are looking for a skilled and experienced Java Developer to join our team. As a Java Developer, you will be responsible for developing and maintaining our applications using Java, Spring framework, and other related technologies. The ideal candidate should have a strong understanding of object-oriented programming principles, as well as experience with a variety of technologies such as SQL, NoSQL, and cloud computing.
Responsibilities:
- Design, develop, and maintain our applications using Java, Spring framework, and other related technologies
- Write clean, efficient, and optimized code for applications
- Collaborate with cross-functional teams to understand user requirements and deliver high-quality solutions
- Develop and maintain backend systems using Spring framework
- Work with databases, including SQL and NoSQL
- Ensure code quality and maintain documentation
- Troubleshoot and debug applications
- Stay updated with emerging trends and technologies in Java development
- Work with other teams to deploy and maintain applications
Requirements:
- 3-7 years of experience in Java development
- Strong understanding of object-oriented programming principles
- Experience with Java, Spring framework, and related technologies
- Familiarity with databases, including SQL and NoSQL
- Knowledge of cloud computing is a plus
- Excellent problem-solving and debugging skills
- Strong communication and collaboration skills
- Ability to work independently and as part of a team
- Bachelor's degree in computer science or a related field
Key Skills:
- Strong proficiency in Java programming language
- Experience with Spring framework, including Spring Boot and Spring MVC
- Familiarity with cloud platforms such as AWS, GCP, and Azure
- Experience building RESTful APIs
- Knowledge of microservices architecture
- Familiarity with SQL and relational databases such as MySQL and Postgres
- Familiarity with NoSQL databases such as MongoDB and Redis
- Experience with messaging systems such as Kafka and RabbitMQ
- Experience with containerization tools such as Docker and Kubernetes
- Understanding of software development principles and experience with SDLC methodologies
- Experience with Git version control and build tools such as Maven and Gradle
- Familiarity with front-end technologies such as Angular and React is a plus
- Strong problem-solving and analytical skills
- Good communication and interpersonal skills
- Ability to work independently and take ownership of tasks
- Experience with test-driven development and unit testing frameworks such as JUnit and Mockito
- Familiarity with CI/CD tools such as Jenkins is a plus
- Familiarity with caching technologies such as Redis is a plus
- Working knowledge of design patterns and software architecture principles is a plus.
- 3+ years of working experience using NodeJS
- Knowledge on Express and/or React Js added advantage
- Experience in MongoDB and/or Postgres
- Experience in designing and developing serverless applications
- Knowledge of SOLID principles, Design patterns
- Good debugging skills using modern Dev Tools
- Experience with RESTful API development and integration
- Microservice experience is preferred
- Experience in Unit tests, code reviews
- Experience in cloud platforms – AWS is a plus
- Ability to up-skill in new technologies
- Innovative thinker with strong problem-solving skills
Functional Competence
- NodeJS
- NPM
- RESTful API
- Microservice
- MongoDB
- Postgres
- Be proficient in server-side development and optimization of data, including database creation and management and debugging
- Integrate data from various back-end services and databases
- Create and maintain software documentation
- Create user-friendly and intuitive interfaces
- Create and analyze reliable and secure back-end functionality
- Maintain, expand, and scale our website
- Remain knowledgeable of emerging technologies/industry trends and apply them into operations and activities
- Collaborate with front-end developers and web designers to match visual design intent
- Bachelor of Engineering/Technology in computer science, software engineering, programming, or equivalent
- Proficiency with languages such as Python, Golang, and Javascript (Node.js, Vue.js)
- Proficiency with MongoDB and MySQL
- Understanding of object-oriented programming
- Experience with the design and implementation of APIs
- Understanding of code versioning and management with Git
- Understanding of code deployment tools such as Jenkins, Capistrano, and ElectricFlow
- Track record of successfully managing multiple company or customer websites
- Excellent time-management and communication skills
quality delivery
● Estimate engineering effort during multiple stages of the product life cycle
● Coach engineering teams in accomplishing architecture, design and implementation
goals Focus on details of software development, design, implementation and
debugging
● Have high technical competence, strong technical background with track record of
individual technical accomplishments
● Ability to play the role of the architect for the team
● Strong sense of ownership/ can do attitude and high attention to detail
● Work with designers, business analysts, and product managers to estimate and
plan projects in an Agile environment
Skills & Experience:
● Hands-on experience in developing, designing & scaling complex
systems Backend: Primarily Node.js and Python
● Databases: Elastic search, DynamoDB, MongoDB, MySQL and Redis
(cache) Web: React, Vue
● Strong Experience in REST API based Microservices development & integration that
includes long running orchestration services
● Preferred AWS Services experience across - S3, DynamoDB, EC2, AWS Lambda, ECS,
ElasticSearch Service, Route 53, API Gateway, CloudFront, CloudFormation, etc.
● Experience with continuous integration and deployment automation tools such as
Jenkins, Salt, Puppet, Chef, Ansible, Travis CI etc
● Experience with gRPC protocol and graphQL frameworks
● The ideal candidate should be willing to commit fully to the company and drive the
company forward
Minimum 3+ Years of hands-on experience in developing Python Applications.
Excellent knowledge of Python and experience in or in-depth understanding of core Python
Knowledge in Lists, Tuples, and Dictionaries
Excellent knowledge of Python Constructor- Parameterized and Non-Parameterized
Must have experience in core python concepts about data structure, OOPS concepts, XML parsing, XML to JSON, optimizations
Developers should have developed Web Based applications., back end, SQL
Agile and scrum methodology
Should not be test automation, Application development frame work
Excellent Communication Skill
Good to Have
Django/ Flask
Strong Hands-on experience in HTML, CSS, DTL(Django Template Language), SASS.
knowledge of SQL









