Java J2ee Programmer

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

Position Overview

We are seeking a skilled Developer to join our engineering team. The ideal candidate will have strong expertise in Java and Python ecosystems, with hands-on experience in modern web technologies, messaging systems, and cloud-native development using Kubernetes.

Key Responsibilities

• Design, develop, and maintain scalable applications using Java and Spring Boot framework
• Build robust web services and APIs using Python and Flask framework
• Implement event-driven architectures using NATS messaging server
• Deploy, manage, and optimize applications in Kubernetes environments
• Develop microservices following best practices and design patterns
• Collaborate with cross-functional teams to deliver high-quality software solutions
• Write clean, maintainable code with comprehensive documentation
• Participate in code reviews and contribute to technical architecture decisions
• Troubleshoot and optimize application performance in containerized environments
• Implement CI/CD pipelines and follow DevOps best practices
•  
• Required Qualifications
• Bachelor's degree in Computer Science, Information Technology, or related field
• 4+ years of experience in software development
• Strong proficiency in Java with deep understanding of web technology stack
• Hands-on experience developing applications with Spring Boot framework
• Solid understanding of Python programming language with practical Flask framework experience
• Working knowledge of NATS server for messaging and streaming data
• Experience deploying and managing applications in Kubernetes
• Understanding of microservices architecture and RESTful API design
• Familiarity with containerization technologies (Docker)
• Experience with version control systems (Git)
•  
• Skills & Competencies
• Skills Java (Spring Boot, Spring Cloud, Spring Security)
•  
• Python (Flask, SQL Alchemy, REST APIs)
• NATS messaging patterns (pub/sub, request/reply, queue groups)
• Kubernetes (deployments, services, ingress, ConfigMaps, Secrets)
• Web technologies (HTTP, REST, WebSocket, gRPC)
• Container orchestration and management
• Soft Skills Problem-solving and analytical thinking
• Strong communication and collaboration
• Self-motivated with ability to work independently
• Attention to detail and code quality
• Continuous learning mindset
• Team player with mentoring capabilities

Experience : 4 - 8 Years

Primary Skills

• BE/BTech/MTech with 1 year of experience in .NET Framework like C#.Net and ASP.Net
• Atleast 1 year of experience on Web Application development with ADO.Net, HTML, CSS, JavaScript/Jquery
• Good experience in Writing Complex SQL Queries using any of the RDBMS Database like Oracle, SQL Server etc
• Experience in Creating and Testing Stored Procedures and Functions

Secondary Skills

• Ability to analyse the existing code in the application and identify the Program Logic
• Experience in implementing AJAX through Javascript/Jquery
• Experience in Creating Reports and Documents using Crystall Reports
• Experience in creating Front End Validations using JavaScript/Jquery
• Experience in doing Manual or Automated Test will be a plus

Desired Skills

• Good communication Skills
• Good conceptualization skills
• Good visualization ability
• Good analytical capability
• Quality focused
• Good problem solving ability

Location : Bangalore

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 :

- B.E in computer science or related fields.

- 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 Java, database(Oracle), OOPS, Java Swing, Javafx

- Self-Motivated, flexible & Innovative.

Role / Purpose - Lead Developer - API and Microservices

Must have a strong hands-on development track record building integration utilizing a variety of integration products, tools, protocols, technologies, and patterns.

• Must have an in-depth understanding of SOA/EAI/ESB concepts, SOA Governance, Event-Driven Architecture, message-based architectures, file sharing, and exchange platforms, data virtualization and caching strategies, J2EE design patterns, frameworks
• Should possess experience with at least one of middleware technologies (Application Servers, BPMS, BRMS, ESB & Message Brokers), Programming languages (e.g. Java/J2EE, JavaScript, COBOL, C), Operating Systems (e.g. Windows, Linux, MVS), and Databases (DB2, MySQL, No SQL Databases like MongoDB, Cassandra, Hadoop, etc.)
• Must have experience implementing API Service architectures (SOAP, REST) using any of the market-leading API Management tools such as Apigee and frameworks such as Spring Boot for Microservices
• Should have Advanced skills in implementing API Service architectures (SOAP, REST) using any of the market-leading API Management tools such as Apigee or similar frameworks such as Spring Boot for Microservices 
• Appetite to manage large-scale projects and multiple tracks
•  Experience and knowhow of the e-commerce domain and retail experience are preferred

We are looking for a passionate Software Engineer to design, develop and install software
solutions. You will form part of a team that will build infrastructure to revolutionize the way
real-estate transactions work in India.
We are looking for a solid Rockstar engineer who can hack around multiple technologies and
build highly scalable, low latency, distributed systems with RESTful services, the latest frontend
MVC frameworks, native apps for android & IOS, and part of building core front-end frameworks.
The pace of our growth is incredible – if you want to tackle hard and interesting problems at
scale, and create an impact within an entrepreneurial environment, join us!

Job Responsibilities:
Execute full software development life cycle (SDLC)
Develop flowcharts, layouts, and documentation to identify requirements and solutions
Write well-designed, testable code
Produce specifications and determine operational feasibility
Integrate software components into a fully functional software system
You will build robust secure and scalable micro-services to power the NoBroker platform for end customers.
● You will be contributing to NoBrokers customer success cloud and enable data-driven
decisions using bots, machine learning & artificial intelligence algorithms.
● You will be responsible to implement RESTful services with metric-driven KPIs. You will
be working closely with other team members to develop world-class reusable UI
components.

Primary Requirements:
B.Tech/B.E. from a reputed college or related technical discipline with 2+years of hands-on
experience in the following Technology and programming methodology :
● Proven work experience as a Software Engineer or Software Developer
● Experience designing interactive applications
● exposure in building RESTful APIs, Hands-on working experience with the Scalable and
fault-tolerant application.
● Working experience with databases like SQL and NoSQL (MySQL, MongoDB,
Redis, and elastic search)
● Provenance experience with any ORM tools like JEE, Spring, Hibernate.
● Experience with test-driven development
● Proficiency in the software engineering tool
● High adaptability in a dynamic start-up environment.