Job location: Gurugram/Delhi Region (Hybrid)
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.
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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.
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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.
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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.
Sun King is the world’s leading off-grid solar energy company, combining cutting-edge product design, fintech, and field operations to deliver energy access for the 1.8 billion people who live without an affordable and reliable electric-grid connection.
Sun King has built a new kind of energy utility: distributed, green, customer-centric, and affordable. We bring clean, reliable, decentralized energy directly into people’s lives — from solar kits that provide first-time energy access to multi-kilowatt systems that serve both off-grid users and grid-connected customers powering larger homes, schools, hospitals, farms, offices, and light manufacturing.
Already, 25 million homes and businesses rely on Sun King for electricity supply and the appliances and services it enables: lighting, televisions, fans, refrigeration, and smartphones.
Sun King combines energy generation, energy-efficient appliances, installation, and financing into one seamless offering. Think of it as a distributed utility, designed for wherever energy is needed and designed to scale with its users as incomes and energy needs grow.
Sun King makes solar products affordable to low-income households and businesses via ‘pay-as-you-go’ (PAYG) purchase financing. Sun King installs solar after customers pay a small deposit. Customers then make small, manageable payments of as little as US $0.14 a day via mobile money or cash.
Instead of paying for expensive, polluting, and health-damaging kerosene for lighting or diesel for power, customers unlock savings through accessing solar power and after one to two years of payments, customers own their solar equipment outright.
Sun King collects payments digitally through mobile money systems and its 35,000 field agents — over 1 million payments each day. To date, Sun King has extended more than $1.4 billion in PAYG loans to customers.
Sun King began by powering homes and businesses with solar systems delivered through PAYG financing. Now, we’re using the same model to make smartphones and clean cooking equipment affordable: helping households connect to the digital economy and transition from wood-based fuels to modern, sustainable alternatives.
Sun King employs 3,500 full-time staff in 14 countries, with specialties spanning product design, data science, logistics, customer service, sales, software, operations, and more — all with a passion to serve off-grid families. Sun King is committed to gender diversity in the workplace. Women represent 42% of Sun King’s workforce.
