Backend Engineer

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.

Job Description

We are looking for motivated IT professionals with at least one year of industry experience. The ideal candidate should have hands-on experience in AWS, Azure, AI, or Cloud technologies, or should be enthusiastic and ready to upskill and shift to new and emerging technologies. This role is primarily remote; however, candidates may be required to visit the office occasionally for meetings or project needs.

Key Requirements

• Minimum 1 year of experience in the IT industry
• Exposure to AWS / Azure / AI / Cloud platforms (any one or more)
• Willingness to learn and adapt to new technologies
• Strong problem-solving and communication skills
• Ability to work independently in a remote setup
• Must have a proper work-from-home environment (laptop, stable internet, quiet workspace)

Education Qualification

• B.Tech / BE / MCA / M.Sc (IT) / equivalent

• Design, develop, test and maintain backend services and APIs using Java and Spring Boot.

• Architect and implement microservices to ensure scalability and robustness of

applications.

• Create and maintain data pipelines to handle large volumes of data efficiently.

• Collaborate with cross-functional teams to gather requirements and deliver high-quality software solutions.

• Participate in code and design reviews to minimize rework and catch issues early in the process.

• Optimize and improve the performance, scalability, and reliability of our systems.

• Conduct code reviews and contribute to best practices in software development.

• Stay updated with the latest industry trends and advancements in Java and backend development technologies

Rejolut is one of the award-winning fastest-growing emerging tech company which is working on leading technology like Blockchain, ML & AI, Complex mobile & web apps, IoT, etc.

The ideal candidate will be responsible for developing a highly scalable and secure code.

Responsibilities:-
- Able to take the Extreme Ownership of modules/product/projects
- Able to learn & implement new technology/framework/library at God Speed
- Able to come with an optimal solution for the business problem
- Can handle calls with the client & customer to know their feedback
- Writing clean code & able to dig into other's code or open-source code.

Desired Candidate Profile:-
- Good problem-solving skills are a must

- Expertise in Node.js development, Javascript (hands-on Experience )
- Exposure to developing APIs with Node JS
- Knowledge of Node.js and frameworks available for it such as Express, sails.js, StrongLoop, etc
- Knowledge of SQL and NoSQL database
- Knowledge of tools like Docker, Git, Postman, JSdocs, etc.
- Basic understanding of front-end technologies, such as HTML5, and CSS3
- Added advantage (Python or Ruby or Golang)
- Self-motivated and able to drive the team
- Good communication and interpersonal skills
- Experience in working in fintech is a plus

 How we are different 
 -We are a young and dynamic team who are obsessed with solving the business problem at scale.   

-We are a technology agnostic company that focuses more on finding the optimal solution to the business problem rather than technology.

 Why join us
 - We provide a huge learning curve. Spending 1.5-2 years with us will put you 3 years ahead in the career.
- We work only on cutting edge technology like React, React Native, Flutter, NodeJS, Python, Go, Svelte, ELM
- There are two technology Co-founder in the company who are pretty much hands-on and have earlier bult the Consumer application which is downloaded millions of times and are in leadership position in copanies like Samsung, Purplle, Loylty Rewardz.
- Get mentored by the best in the industry
- Flexible working hours
- Perks best in the industry

Java, Java8, Springboot, Microservices, core java, j2ee, JAVA, Springboot

backend, core java, java8, micro services

Responsibilities

1. Writing clean, high-quality, high-performance, maintainable code
2. Develop and support software including applications, database integration, interfaces, and new functionality enhancements
3. Coordinate cross-functionally to insure project meets business objectives and compliance standards
4. Support test and deployment of new products and features
5. Participate in code reviews

Skills & Qualifications

• 4-12 years of experience in Java Development.

• Excellent verbal and written English communication is a must. You may have to interact with clients directly.

• Technology agnostic approach is a must. Ready to adopt new technology and a faster learning curve.

• Writing scalable, maintainable and reusable code.

• Keen interest in SAAS based products and mobile applications.

• Experience working with Distributed Systems

• Java, Spring Boot, Microservices, API Design Experience with Event-Driven Architecture, Multithreading

• Kafka iOS Experience with Event Sourcing Reactive and Functional

• Programming Strong understanding of best practices for creating/working with Microservices

• Experience implementing Message Brokers and Messaging subsystems(experience working with Kafka a strong plus)

• Be open-minded, creative, and self-critical; be collaborative and communicative

• Have experience with and curiosity about agile and lean philosophies

• Experience working with small teams to ship products to market

• Have experience developing full-service consumer, employee and business applications

• Language agnostic and experienced polyglot Passion for Working Software and SOLID principles

• Experience with designing and refactoring complex systems

• Experience with Test-Driven Development (TDD) Interest in working in a pair-programming environment Deep understanding of design patterns and applying them in production environments

• Passion for enabling team members

• Java 8 or Java 11. Both are LTS. The project will be on Java11

• Spring Boot

• Git

• SQL

• AWS and AWS Aurora

• Microservices

• Multithreading

Perks

• Flexible time schedule.
• Work from home or work from anywhere.
• Health insurance.
• Team building activities.
• Training and conference tickets.

Responsibilities:

• Design and deliver scalable web services, APIs and backend data modules.
• Understand requirements and develop reusable code using design patterns & component architecture and write unit test cases
• Collaborate with product management and engineering teams to elicit and understand the requirements and develop solutions
• Stay current with latest tools, technology ideas and methodologies; share knowledge by clearly articulating results and ideas to key decision makers.

Required Qualifications:

• 6+ years of experience writing multithreaded programs running in Java
• Experience on Java, Spring Boot,, Apache Nifi ,  workingDocker, EKS, Azkaban, Jenkins
• Experience with Git and build tools like Gradle/Maven/SBT.
• Strong understanding of object-oriented design, data structures, algorithms, profiling, and optimization.
• Have elegant, readable, maintainable and extensible code style.
• Experience on AWS is preferable
• Knowledge on top algorithms like sorting, heap/stack, queue, search, etc.
• Familiarity with test-driven development
• Thrive in a fast-paced environment, with ability to deliver code of quality quickly.
• Attention to details. Strong communication and collaboration skills.
• BS in Computer Science or equivalent

Who are we?

We are a venture capital-backed software development company headquartered in Canada. We develop in-house products to disrupt one industry at a time and partner as a technology service provider to selected startups.

Who are you?

Experience in writing applications using Nodejs including Express or similar.
Must be good in MySQL or one of the databases such as Mongo.
Proficient in Javascript and good experience and knowledge of open source tools, frameworks, broader cutting-edge technologies around server-side development.
Excellent data structure, algorithm, and problem-solving skills.
Created and consumed various APIs in the past.
Should be an active contributor to developer communities like Stack Overflow, GitHub, Google Developer Groups (GDGs).
Customer-focused, react well to changes, work with teams, and able to multi-task.
Must be a proven performer and team player that enjoys challenging assignments in a high-energy, fast-growing, and start-up workplace.
Must be a self-starter who can work well with minimal guidance and in a fluid environment.

Some of the technologies we use are:
NodeJS
ExpressJS
Angular 9
AWS
Github
PSQL, MongoDB
Selenium