- Experience: 1+ yrs - 3yrs
- Key Skills:
- Expert Proficiency in anyone the below programming language - Java, Node JS, PHP or GoLang
- Expert Computer Science fundamentals like Data Structures, Algorithms, Time Complexity, and others
- Strong Microservices, REST API, Git source control, CI/CD, and other latest technology trends
- Strong System Design, DB Design proficiency
- Strong knowledge in Design Patterns, best software development practices
- Good exposure to working in Open Source stack, E-Commerce, or Fintech domain.

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About Sun King
Sun King is the world’s leading off-grid solar energy company, delivering energy access to 1.8 billion people without reliable grid connections through innovative product design, fintech solutions, and field operations.
Key highlights:
- Connected over 20 million homes to solar power across Africa and Asia, adding 200,000 homes monthly.
- Affordable ‘pay-as-you-go’ financing model; after 1-2 years, customers own their solar equipment.
- Saved customers over $4 billion to date.
- Collect 650,000 daily payments via 28,000 field agents using mobile money systems.
- Products range from home lighting to high-energy appliances, with expansion into clean cooking, electric mobility, and entertainment.
With 2,800 staff across 12 countries, our team includes experts in various fields, all passionate about serving off-grid communities.
Diversity Commitment:
44% of our workforce are women, reflecting our commitment to gender diversity.
About the role:
The Backend Developer works remotely as part of the technology team to help Sun King’s EasyBuy business unit design and develop software to improve its field team operations.
What you will be expected to do
- Design and develop applications/systems based on wireframes and product requirements documents.
- Design and develop logical and physical data models to meet application requirements.
- Identify and resolve bottlenecks and bugs based on operational requirements.
- Perform unit tests on code to ensure robustness, including edge cases, usability, and general reliability.
- Write reusable and easily maintainable code following the principles of DRY (Don’t Repeat Yourself).
- Integrate existing tools and business systems, both in-house and external services, such as ticketing software and communication tools.
- Collaborate with team members and product managers to understand project requirements and contribute to the overall system design.
You might be a strong candidate if you have/are
- Have development experience: 1-2 years backend development experience and have strong problem-solving abilities, proficiency in data structures, and algorithms.
- Have a profound grasp of object-oriented programming (OOPS) standards and expertise in Core Java.
- Have knowledge of SQL, MySQL, or similar database management.
- Have Experience in integrating web services, such as SOAP, REST, JSON, and XML.
- Have familiarity with RESTful APIs for linking Android applications to backend services.
- Have preferred experience with version control systems like Git, but not mandatory.
- Have additional knowledge of web technologies like HTML, CSS, JavaScript, and frameworks like Spring or Hibernate would be advantageous.
What we offer (in addition to compensation and statutory benefits):
- A platform for professional growth in a rapidly expanding, high-impact sector.
- Immerse in a collaborative culture, energized by employees of Sun King who are collectively motivated by fostering a transformative, sustainable venture.
- A genuinely global environment: Engage and learn alongside a diverse group from varied geographies and backgrounds.
- Tailored learning pathways through the Sun King Center for Leadership to elevate your leadership and managerial capabilities.

Backend - Principal IC/Lead SDE
Minimum Requirements
- 8+ years development experience
- Solid Experience and knowledge of
- Coding and debugging using Object Oriented languages like Java, C++, Go or similar languages.
- Database design, Query optimizations, pitfalls (both SQL, NoSQL)
- Developing Scalable, distributed systems and patterns
- Developing REST and/or GraphQL based APIs
- Writing and driving Clean code in a team (via SOLID principles).
- Knowledge of writing unit tests
- NodeJS
Good to have
- Experience with GoLang/Python
- Experience with Microservices, designs and patterns
- Experience with Dockers/Kubernetes and orchestration
- Familiarity with Reactive programming and patterns like RxJs/RxJava, CQRS, Eventing systems
- Experience with automating DevOps lifecycle
- Proficiency with
Responsibilities
- Work with Product team and Drive design, development and deployment of the overall architecture and individual modules to support our Apps , website and internal tools
- Ensure the entire stack is designed and built for availability, speed, scalability, testability, debugging
- Design and development of our REST and GraphQL API
- implement and improve continuous integration and deployment
- Serve as a technical lead for the team
- Mentor team members


- Optimizing components for maximum performance across a vast array of web-capable devices and browsers
- Ability to understand business requirements and translate them into technical requirements
- You will ensure that these components and the overall application are robust and easy to maintain.
- Have a good understanding of design and user experience principles.
- Open-minded, flexible, and willing to adapt to changing situations
- Ability to work independently as well as on a team and learn from colleagues
- High adaptability in a dynamic start-up environment
- Ensuring technologies are used efficiently, profitably, and securely. Evaluating and implementing new systems and infrastructure.
- Excellent troubleshooting, analytical and problem-solving abilities with a tenacious commitment to finding the root cause of issues.
Qualifications :
- B. Tech/ B.E. /M. Tech/ BCA / MCA or a related technical discipline from reputed universities
Skills Required :
- Minimum 1+ years of experience in REST API development using python.
- Must have experience with anyone popular python frameworks like Django, Flask, and FastAPI Framework.
- Experience in designing and developing Restful Web services and Remote procedure calls.
- Able to integrate multiple data sources and databases into one system
- Knowledge of load testing and optimizing code for performance, security, and scalability
- Experience with Unit testing frameworks in Python
- Knowledge of modern authorization & authentication mechanisms.
- Able to create database schemes that represent and support business processes
- Knowledge of Version Control System & basics of CI/CD
- Write and maintain technical documentation
- Solid foundation in OOPS, Data structures, and Algorithms
- Knowledge of SDLC phases of project development.
- Experience in one or more No SQL Databases such as MongoDB, and Cassandra.
- Experience with event-based databases and programming
- Good experience in synchronous programming and thread-based programming.
- Experience with schedulers.
- Good to have knowledge of Linux shell commands.
- Good to have experience in Kubernetes & Docker
- Knowledge of any Cloud Service like GCP or AWS would be an added advantage
- Cares deeply about writing Quality, Testable & Modular code
- Good to have an understanding of NLP.


A quick overview of our stack:
Python, MySQL, NoSQL, Memcache, Bigquery, Microservices.
Responsibilities
As a backend developer, you would be responsible for building, scaling, and maintaining the multiple modules, encompassing - external integration, API management, building business and operation processes, designing and defining microservices, designing multi-input/output state machines
You will be given complete ownership of modules and processes. You will work with business, product, and UI teams to work on new features and products. You are expected to drive the services/modules to maximize its business impact and customer delight.
- Acumen for good, secure API design
- Write clear and effective API documentation
- Write/review test cases for code and process coverage
- Stickler for good, clear, secure coding, both oneself and team members by code review
- Reviewing designs, code, and processes from a system security standpoint
- Defining and building micro-services
- Building systems with positive business impact Tracking module health, usage, behavior tracking, measure and improve code and processes
Requirement
You will be working on multiple projects/modules. You are expected to write code to integrate - external providers, internal business and process tools, customer-facing applications, and partner-facing applications.
- At least 1-3 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
Good to have
- Focus on constant improvement of developer experience
- Building or Working knowledge of CI/CD
- Basic know-how of front-end technologies like AngularJS/React
- Have worked on additional languages like Javascript/Ruby
Job Location - Bangalore

What is the role?
You will be focusing on development of all server-side logic, definition, and maintenance of the central database. With your expertise in Node.js and as a full stack developer you will be managing the interchange of data between the server and the users.
Key Responsibilities
- Design and develop SaaS-based applications based on microservices architecture
- Driving innovations in the platform constantly
- Estimate efforts, identify risks, devices and meets project schedules
- Mentors/coaches engineers and provide technical leadership
What are we looking for?
An enthusiastic individual with the following skills. Please do not hesitate to apply if you do not match all of it. We are open to promising candidates who are passionate about their work and are team players.
- BS/MS in Computer Science or equivalent.
- 3-6 years of strong design/development experience in building massively large-scale distributed internet systems and products
- Strong understanding of DevOps tasks, CI/CD
- Excellent communication and interpersonal skills
- Have keen eye to detail
- Displayed effectiveness in being a team player, have a proven track record of performance
- Enjoys working on challenging assignments and is result oriented
- Self-starter, self-motivated and work with minimal supervision
- Agile and display flexibility in swiftly adapting to change in work requirement
Strong proficiency in –
- JavaScript, Node.js and frameworks available for it
- Code versioning tools, such as Git
- NoSQL and RDBMS systems
- Push-pull systems like Kafka, Redis
- Data structures & algorithms skills
Good to have experience –
- Programming languages like Python, Golang, ReactJs
Be familiar with –
- Designing highly available solutions, fault-tolerant systems, microservices architecture, REST APIs for on-premises, cloud (Google Cloud Platform or Amazon Web Services or Microsoft Azure), or hybrid infrastructure.
- Modern container technologies such as Docker, Kubernetes
- Server-side templating languages such as Jade, EJS etc
- Open source software, frameworks, and broader cutting-edge technologies
Whom will you work with?
You will closely work with the engineering team and support the Product Team of Plum.
What can you look for?
A wholesome opportunity in a fast paced environment that will enable you to juggle between concepts, interact and share your ideas and have loads of learning while at work. This role will help you learn what and how ledgers work in a high volume traffic system. Will learn microservice for a high availability system. Work with a team of highly talented young professionals and enjoy the benefits of being at Xoxoday.
We are
A fast growing SaaS commerce company based in Bangalore with offices in Delhi, Mumbai, SF, Dubai, Singapore and Dublin. We have three products in our portfolio: Plum, Empuls and Compass. Xoxoday works with over 1000 global clients. We help our clients in engaging and motivating their employees, sales teams, channel partners or consumers for better business results.
Way forward
We look forward to connecting with you. As you may take time to review this opportunity, we will wait for a reasonable time of around 3-5 days before we screen the collected applications and start lining up job discussions with the hiring manager. We however assure you that we will attempt to maintain a reasonable time window for successfully closing this requirement. The candidates will be kept informed and updated on the feedback and application status.
●Work closely with Principal Engineers to design, implement and deploy applications that impact
Rupeek’s business with an emphasis on Mobile, Payments, Core Platform and Analytics.
●Drive the architecture and design of large-scale, multi-tiered, distributed software applications, tools,
systems and services using object-oriented design, distributed programming, Java and C/C++.
●Gather business and functional requirements from external and/or internal customers and end-users,
and translate requirements into technical specifications to build robust, scalable, supportable solutions
that work well between a range of complex systems.
●Serve as technical lead throughout the full development lifecycle, end-to-end, from scoping, planning,
conception, design, implementation and testing, to documentation, delivery and maintenance.
●Provide design reviews for other engineers, including feedback on architecture and design issues, as
well as integration, performance and scalability.
●Manage engineers on multiple technical projects and ensure schedules, milestones, and priorities are
compatible with technology and business goals.

Demonstrable experience in Core Java (8 or higher) and Spring framework (Core, AOP, Batch, JMS).
Multithreading, Data structure, Algorithm, Eceptional handling,OOPS Concepts, collections
- Excellent customer facing skills that include conducting compelling technical briefing & demonstrations. The person should have a technical aptitude to implement new technologies and articulate the solutions to the customer.
- Java, Spring with Database & Unix - Preferred with Scala or Spark(Hadoop) background
- Proven knowledge in OOPS & Data Structures
- Strong experience of developing multi-threaded and synchronization application
- Demonstrated delivery experience of Micro services APIs using Springboot, Oracle PL/SQL development and activities like Performance tuning / Optimization.
- Experience of using Git/Bitbucket, Maven/Bamboo, & related tools.
- Good Understanding of Agile Delivery Methodology & experience in working with Scrum teams.




