Backend Engineer Lead

About the role:

We are looking for a Backend Engineer to join a mature, scaled product platform that is already serving business-critical workflows. This role focuses on enhancing existing backend systems, improving reliability, performance, and scalability, and building new features on top of a well-established architecture.

The ideal candidate is strong at writing production-quality code, debugging complex distributed systems, and knowledgeable about how design decisions impact scalability, availability, and long-term maintainability. You will work closely with cross-functional teams to ensure the platform continues to perform reliably at scale while evolving with business needs.

What you will be expected to do:

• Develop, enhance, and maintain backend services for existing user, inventory, pricing, order, and payment management systems running at scale.
• Write clean, efficient, and highly reliable code using Java 8 and above and Spring Boot 2.7 and above.
• Own and improve production systems with a strong focus on performance, scalability, availability, and fault tolerance.
• Debug and resolve complex production issues involving services, databases, caches, and messaging systems.
• Contribute to low-level design (LLD) and actively participate in high-level architecture (HLD) discussions for new features and system improvements.
• Work with event-driven and asynchronous architectures, ensuring correctness and reliability of data flows.
• Optimize database schemas, queries, indexing strategies, and caching layers for high-throughput workloads.
• Partner with DevOps, QA, and Product teams to support smooth 24×7 production operations.
• Participate in code reviews, design reviews, and incident post-mortems to continuously improve system quality.
• Take end-to-end ownership of backend components, from design and implementation to deployment and production support.

You might be a strong candidate if you have/are:

• Bachelor’s degree in computer science, engineering, or equivalent experience.
• 2+ years of experience building and maintaining backend systems in production environments.
• Strong proficiency in Java with hands-on experience in Spring Boot–based microservices.
• Solid knowledge of data structures, algorithms, and backend problem solving.
• Strong experience with PostgreSQL or other relational databases in high-scale systems.
• Experience building and consuming RESTful APIs and working with asynchronous systems.
• Strong debugging and troubleshooting skills in live production systems.
• Good understanding of software engineering best practices, including testing, code reviews, CI/CD, and release management.
• Clear communication skills and the ability to partner effectively within a team.
• Hands-on experience with Kafka or similar messaging/event-streaming platforms.
• Exposure to distributed systems, microservices architecture, and scaling strategies.

Good to have:

• Experience using Redis, Elasticsearch, and MongoDB in production systems.
• Experience with monitoring, logging, and observability tools (e.g., Prometheus, Grafana, ELK).
• Familiarity with cloud infrastructure and containerized environments (Docker, Kubernetes).
• Experience participating in on-call rotations and handling production incidents.

What Sun King offers:

• Professional growth in a dynamic, rapidly expanding, high-social-impact industry
• An open-minded, collaborative culture made up of enthusiastic colleagues who are driven by the challenge of innovation towards profound impact on people and the planet.
• A truly multicultural experience: you will have the chance to work with and learn from people from different geographies, nationalities, and backgrounds.
• Structured, tailored learning and development programs that help you become a better leader, manager, and professional through the Sun King Center for Leadership.

About Sun King

Sun King is a leading off-grid solar energy company providing affordable, reliable electricity to 1.8 billion people without grid access. Operating across Africa and Asia, Sun King has connected over 20 million homes, adding 200,000 homes monthly.

Through a ‘pay-as-you-go’ model, customers make small daily payments (as low as $0.11) via mobile money or cash, eventually owning their solar equipment and saving on costly kerosene or diesel. To date, Sun King products have saved customers over $4 billion.

With 28,000 field agents and embedded electronics that regulate usage based on payments, Sun King ensures seamless energy access. Its products range from home lighting and phone charging systems to solar inverters capable of powering high-energy appliances.

Sun King is expanding into clean cooking, electric mobility, and entertainment while serving a wide range of income segments.

The company employs 2,800 staff across 12 countries, with women representing 44% of the workforce, and expertise spanning product design, data science, logistics, sales, software, and operations.

What we are looking

• You must have experience in Python, including development of microservices using flask/fastapi/sanic.
• You hold knowledge of at least one Python web frameworks
• You have experience in NoSQL databases such as MongoDB
• You are familiar with relational databases and unstructured data.
• You are familiar with some ORM (Object Relational Mapper) libraries.
• You have prior exposure to code versioning tools such as Git.
• You understand fundamental design principles behind a scalable application

Good to have

• Experience in cloud services such as AWS
• Knowledge of user authentication and authorization between multiple systems, servers, and environments
• Understanding of the threading concepts in Python and multi-process architecture

What you'll do

• Create database schemas that represent and support business processes
• Integrate multiple data sources and databases into one system.
• Develop and integrate RESTful APIs and services for business use cases
• Perform unit and integration tests on developed modules

Our client has a B2C startup in the Fintech space building the payment system for the

subscription economy. We have raised pre-seed funding from some of the leading

investors in the country. A small brief about their product - To build the payment

system for the subscription economy and make it easier to discover and manage

subscription payments in India and abroad. To give subscription merchants the

power to increase their offering by providing user subscription data, multiple login

authentication, distribution and one click subscription checkouts. To enable users to

participate in the subscription economy & increase adoption of new subscriptions.

The core team come from strong backgrounds having been alumni of IIT Madras,

IIM Calcutta as well as having worked with some of the top startups in the

ecosystem including Swiggy, Mckinsey, Barclays, etc..

What we're looking for

We are looking for an experienced Python developer to join our engineering team

and help us develop our mobile application. In this role, you will be responsible for

writing and testing scalable code, developing back-end components, and integrating

user-facing elements in collaboration with front-end developers.

To be successful as a Python developer, you should possess in-depth knowledge of

object-relational mapping, experience with server-side logic, and above-average

knowledge of Python programming.

As one of the earliest members in engineering, you will have the flexibility to design

the application and systems from ground up. As any early-stage start-up, we expect

you to be comfortable wearing various hats, and be proactive contributor in building

something truly remarkable.

Responsibilities

Coordinating with development teams to determine application requirements.Python Backend Developer

2

Writing scalable code using Python programming language.

Developing back-end components.

Implement business logic in the backend

Integrating user-facing elements using server-side logic.

Create restful APIs for a seamless integration with our mobile front end

Testing and debugging applications.

Assessing and prioritizing client feature requests.

Integrating data storage solutions.

Coordinating with front-end developers.

Reprogramming existing databases to improve functionality.

Developing digital tools to monitor online traffic.

Qualifications

4+ years of experience in Python, Django, Mongo, Express, MySQL, etc

Have built applications capable of serving high volume with low latency in

production

Following practices of agile development with continuous integration/deployment

A deep understanding and multi-process architecture and the threading

limitations of Python.

Experience in deploying applications in AWS cloud

Ability to collaborate on projects and work independently when required.

Knowledge in building applications for Fintech/payments domain is a bonus

Bachelor's or Master's degree in CS or equivalent from a reputed institution

At LambdaTest, We help developers and testers fix their applications across a combination of 2000+ browsers and Operating Systems by providing a complete cross-browser ecosystem on the cloud. As Backend Developer You will work with other Developers throughout the Software Development Life Cycle.

You will join a dynamic and fast-paced environment and work with cross-functional teams to design, build and roll out product that deliver the company’s vision and strategy.

What’s the Opportunity?

• As a hands-on engineering professional, you'll stay on top of the details and will be more focused on building a better, more efficient program and creating the best user experience and 
• Support and collaborate with our service engineers in getting to the bottom of issues and come up with robust solutions.
• Produce high quality software that is unit tested, code reviewed, and checked in regularly for continuous integration.
• Participate in a culture of code reviews, writing tech specs, and collaborating closely with other people.
• Design distributed systems using micro services architecture would be plus.
• Implementing high performance and non-blocking systems to serve traffic heavy SaaS based product.

Requirements and qualifications-

• Bachelor's degree in Computer Science or equivalent combination of technical education with 2-4 Years of work experience.
• Experience with one or more general purpose programming languages, including but not limited to:Python, Golang, NodeJs 
• A solid understanding of software construction
• The ability to naturally follow good development practices like test automation, CI/CD, source version control, etc.

Job description:

Core PHP (Knowledge of functions, Methods, PHP OOPS Concept, Ajax, MySQL, Jquery), Javascript, Basic knowledge of HTML, CSS, MVC Structure 

Knowledge about socket

• Experience in either of these Relational DB’s MS SQL Server / PostgreSQL / AWS Aurora DB / MySQL / Oracle / NOSQL DBs (MongoDB / DynamoDB / DocumentDB) in an application development environment and eagerness to switch DB.
• Design database tables, views, indexes
• Write functions and procedures for Middle Tier Development Team
• Work with any front-end developers in completing the database modules end to end (hands-on experience in parsing of JSON & XML in Stored Procedures would be an added advantage).
• Query Optimization for performance improvement
• Design & develop SSIS Packages or any other Transformation tools for ETL

• Banking / Insurance / Retail domain would be a plus.
• Interaction with a client a plus

• Knowledge in a Cloud Platform (AWS / Azure)
• Knowledge on version control system (SVN / Git)
• Exposure to Quality and Process Management
• Knowledge in Agile Methodology

• Team building (attitude to train, work along, mentor juniors)
• Communication skills (all kinds)
• Quality consciousness
• Analytical acumen to all business requirement
• Think out-of-box for business solution

• Good Programming Knowledge in Dot Net, MVC, Asp. Net and having an experience in Frontend ( Angular2+ Versions/ React JS) will be plus point.
•  Experience in OOPS, HTML5, CSS, AJAX, Javascript, JQuery
• Good Understanding of Agile- SCRUM methodologies.
• Thorough knowledge in OOPS Concepts
• Preferred Knowledge in MVC Framework

The ideal candidate is a highly resourceful and innovative developer with extensive experience in the layout, design and coding of websites specifically in PHP format. You must also possess a strong knowledge of web application development using PHP programming language and MySQL Server databases. 

Responsibilities

- Who can understand and demonstrate to maintain Data Quality in high volume data  systems.

- One who can understand and can deliver highly tested system

- Who can routines to test their own code using negative sql concepts.

- Who can use OOP concepts with same class being used everywhere.

- Knowledge in Angular.js and Laravel is mandatory

- College degree is not mandatory

- hike on last salary will be given

-Full time / Remote job

-Can share cv 

Thanks & Regards,

Annu