Associate Staff Engineer(Cloud)

• Develop, enhance, and maintain Java-based applications using Spring Boot and related frameworks.
• Design, implement, and optimize Microservices with RESTful APIs.
• Build and manage Spring Batch jobs, including scheduling, chunk processing, partitioning, and error handling.
• Apply object-oriented design (OOD) and GoF design patterns (Factory, Singleton, Strategy, Observer, etc.).
• Write clean, maintainable, and scalable code following best coding standards.
• Integrate applications with databases (SQL/NoSQL) and messaging systems (Kafka/RabbitMQ).
• Participate in code reviews, technical discussions, and architectural decisions.
• Troubleshoot production issues and ensure application performance, scalability, and reliability.
• Work in an Agile/Scrum environment and collaborate with cross-functional teams.

Technical Skills Required

• ** Core Java 8+**, OOP, Collections, Multithreading
• ** Spring Boot**, Spring MVC, Spring Data JPA
• ** Spring Batch** (Job/Step configuration, Tasklets, Readers/Writers, partitioning)
• ** Microservices** (REST, API Gateway, service discovery, resilience patterns)
• ** Design Patterns** (Factory, Singleton, Adapter, Strategy, Builder, Observer, etc.)
• ** Databases:** MySQL/PostgreSQL/Oracle, MongoDB (optional)
• ** Messaging:** Kafka / RabbitMQ (preferred)
• ** Build tools:** Maven/Gradle
• ** CI/CD:** Jenkins, GitLab CI, or similar
• ** Cloud:** AWS / Azure / GCP (optional but preferred)
• ** Testing:** JUnit, Mockito

Why Reelo

In today’s customer-centric world, small and mid-market F&B and retail businesses need to market like the best brands — but collecting, understanding, and acting on customer data is often complex, expensive, and time-consuming. Solving this is why Reelo exists.

Reelo is a new-age customer marketing platform that helps restaurant and retail businesses grow revenue, acquire more customers, and build stronger brands — simply and effectively.

While it’s easier than ever to start a business, it’s harder than ever to grow one. Most businesses struggle with two things: getting customers to make their first purchase, and getting them to come back again and again. Reelo makes this easier by enabling smart, automated customer engagement without adding to already overloaded teams.

We’re building something big, meaningful, and lasting — and we’re looking for curious, driven people who want to do purposeful work and grow together.

About the Opportunity

We are looking for a Senior Backend Developer (MERN Stack) to design, build, and scale backend systems that power modern web and mobile applications. The ideal candidate brings strong technical expertise, a deep understanding of backend architecture, and the ability to translate product requirements into reliable, high-performance solutions.

This role requires high ownership, accountability, and technical leadership. You’ll work across Node.js based microservices, optimize MongoDB queries, design APIs, and drive integrations with internal and external systems — ensuring scalability, security, and maintainability.

What will you do ?

• Design, develop, and maintain RESTful and APIs using Node.js and Express.
• Write clean, modular, and testable code following engineering best practices.
• Architect and optimize MongoDB data models for scalability and performance.
• Lead integrations with external APIs and internal services.
• Ensure backend reliability, scalability, observability, and security.
• Participate in code reviews, mentor junior developers, and contribute to system design.

What you need ?

• 2+ years of backend development experience in Node.js, Express.js, and MongoDB.
• Strong understanding of REST APIs, and microservice architecture.
• Proficiency in JavaScript (ES6+), asynchronous programming, and API design patterns.
• Hands-on experience with AWS ecosystem.
• Familiarity with Git, CI/CD pipelines, and agile workflows.
• Excellent problem-solving skills, system-level thinking, and attention to detail.
• Experience or hands-on working with React Native mobile applications is a strong plus.
• Prior experience in SaaS, high-scale, or data-driven platforms is an advantage.

The firm :

It’s an amazing time to be joining SalaryBox as we continue to transform attendance and payroll for over 60 million MSME’s in India.

We launched the app in Jan 2021, and now have more than 2 million downloads of the app. We support more than 200k businesses and operate at scale.

Backed by Y-Combinator, SalaryBox is India’s leading attendance and payroll app. Considered to be the engine of economies around the world, the MSME segment in India alone has ~63 million units, and employs ~100 million people. The sector accounts for 27% of GDP and is crucial to the functioning of the economy.

We are on a mission to make work easier for these business owners, managers, and employees so that they can focus on the things they do best.

Today, SalaryBox is a fun bunch of analytical and ambitious folks building the first-of-its-kind technologies for the MSME ecosystem. We are here to enhance the employee experience of over 10 million end consumers in the next twelve months. Our mission is big, so we act with urgency in everything we do. We find creative ways to test ideas and learn today so that we focus on the right things tomorrow.

About the Role

We are looking for a Senior Backend Engineer with at least 3 years experience. You will be an integral part of building the back-end architecture and developing core systems.

Responsibilities:

• Architect and develop our core systems from scratch.
• Deploy and maintain the product on AWS.
• Make strategic technical decisions.
• Commit to best practices for testing, logging, and deployments
• Help build the engineering team & subsequently mentor junior developers.

Requirements:

• 3+ years’ experience as a backend engineer.
• Expert in Python and Django.
• Experience with databases (Postgres, Redis etc. ).
• Good understanding of platforms (Docker, AWS).
• Basic understanding of Dev Ops.
• Previous experience architecting and scaling back-end systems
• Hands-on attitude and ability to drive solutions to completion.

• Experience in Web and Mobile Applications
• Agility and ability to adapt quickly to changing requirements and scope and priorities
• Experience in Java, Python.
• Deep understanding of data structures and microservices.
• Knowledge of Node.js
• Understanding the nature of asynchronous programming and its quirks and workarounds
• Familiarity with front-end technologies
• User authentication and authorization between multiple systems, servers, and environments
• Interaction with multiple data sources
• Good understanding of SQL
• Understanding fundamental design principles behind a scalable application
• Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform.
• Implementing automated testing platforms and unit tests
• Proficient understanding of code versioning tools, such as Git .

• At least 2-5 years of working experience in web services, preferably in Python
• Should have built and released APIs in production
• Experience working with RDBMS and NoSQL databases
• Designing thoughtful, extensible data models
• Knowledge of identifying, defining and building micro-services
• Working knowledge of GCS, AWS, Azure or any other cloud provider
• Aggressive problem diagnosis and creative problem-solving skills
• Good communication skills - written and spoken