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Client is a profitable, rapidly scaling unicorn.
Client Company is a profitable, rapidly scaling unicorn which is extremely well capitalized. Client has a very strong moat in the consumer lending space on the back of which it is entering into additional large markets such as E-comm and UPI.
Client company is now entering its next phase of growth from a fast-scaling startup to a robust, high-scale financial platform serving millions of users daily. You'll design systems built for 10x100x growth, make the key technical trade-off calls, and stay deeply hands-on. Beyond building, you'll mentor engineers and work directly with founders and product teams to translate business goals into scalable, reliable systems.
This role is an opportunity to:
- Shape the next-generation architecture for a high-throughput fintech system
- Build systems designed to scale 10x–100x from current volumes
- Solve real-world problems across performance, reliability, and financial-grade security
Responsibilities
- Design and evolve the platform architecture to support 10x–100x growth
- Own systems end-to-end from the first design decision to production impact
- Lead system design discussions and set the long-term technical direction for the platform
- Identify scale bottlenecks early and drive solutions
- Mentor and elevate engineers through design reviews, code quality, and architectural thinking
- Partner directly with founders and product teams to turn business priorities into scalable systems
- Operate with high ownership in a fast-paced environment where priorities evolve quickly
- Drive projects independently own timelines, coordinate with teams, and see delivery
- Conduct rigorous code reviews and champion engineering best practices across the team
- Proactively identify gaps in the system and come up with concrete approaches to address them
- Solve technical problems across the company not just confined to a single pod
- Challenge existing architecture with data and reasoning push back when it’s the right call, and drive adoption of better approaches.
Requirements
- 7–12 years of experience in backend or platform engineering
- Strong computer science fundamentals (preferably from IIT, BITS, NITs)
- Strong proficiency in backend development (Node.js, Java, Go, or equivalent)
- Proven experience scaling systems through high-growth startup phases (1→10 or beyond)
- Track record of building and owning critical platforms or systems from scratch
- Exposure to high-volume transactional systems; fintech or lending is a strong plus
- Bias for action - moves fast, makes sound decisions, owns outcomes end-to-end
- Comfortable navigating ambiguity and evolving priorities in a startup environment
- Strong problem-solving skills ability to break down complex technical challenges and arrive at pragmatic, well-reasoned solutions
- Hands-on experience with platform engineering developer tooling, shared services, infrastructure abstractions, or internal platforms
JOB DESCRIPTION
Experience: 3-8 years
Wissen Technology is now hiring for a Java Developer - Mumbai with hands-on experience in Core Java, algorithms, data structures, multithreading and SQL. We are solving complex technical problems in the industry and need talented software engineers to join our mission and be a part of a global software development team. A brilliant opportunity to become a part of a highly motivated and expert team which has made a mark as a high-end technical consulting.
Required Skills:
- Exp. - 3-8 years
- Experience in Core Java and Spring Boot.
- Extensive experience in developing enterprise-scale applications and systems. Should possess good architectural knowledge and be aware of enterprise application design patterns.
- Should have the ability to analyze, design, develop and test complex, low-latency client- facing applications.
- Good development experience with RDBMS.
- Good knowledge of multi-threading and high-performance server-side development.
- Basic working knowledge of Unix/Linux.
- Excellent problem solving and coding skills.
- Strong interpersonal, communication and analytical skills.
- Should have the ability to express their design ideas and thoughts.
🧠 Job Description: Senior Java Developer (8+ Years Experience)
Location: Mumbai, India
Employment Type: Full-time, Hybrid mode of working
Company: Wissen Technology
Website: www.wissen.com
🚀 About Wissen Technology
Wissen Technology is a specialized technology consulting firm delivering cutting-edge solutions to global leaders in Banking & Finance, Telecom, and Healthcare. Established in 2015 and part of the Wissen Group (founded in 2000), Wissen has scaled rapidly with impressive impact and recognition.
- 🌍 Offices in US, UK, India, Australia, Mexico, and Canada
- 👥 1700+ Wissen Technology professionals; part of a 4500-strong Wissen Group
- 🏆 Great Place to Work® Certified
- 🧠 Featured as a Top 20 AI/ML Vendor (CIO Insider, 2020)
- 📈 Achieved 400% revenue growth in 5 years (with zero external funding)
- 💼 Delivered $1B+ worth of projects to 50+ Fortune 500 companies
Learn more about our work and thought leadership:
📄 Articles by Wissen | 💼 LinkedIn
About the Role
We are seeking an experienced Senior Java Developer with 8+ years of hands-on expertise in building scalable, high-performance applications. The ideal candidate will have strong fundamentals in Java, OOPS, Multithreading, Spring concepts, and SQL, and will play a key role in designing, developing, and optimizing enterprise-grade solutions.
Key Responsibilities
- Design, develop, and maintain complex applications using Core Java and Spring frameworks
- Apply advanced Object-Oriented Programming (OOPS) principles to deliver clean, modular, and reusable code
- Implement and optimize multithreaded applications for high-performance systems
- Work with SQL databases for efficient data modeling, query optimization, and integration
- Collaborate with cross-functional teams to gather requirements and translate them into technical solutions
- Conduct code reviews, troubleshoot issues, and ensure adherence to best practices
- Mentor junior developers and contribute to technical knowledge sharing within the team
- Ensure application scalability, performance tuning, and security compliance
Required Skills & Qualifications
- Bachelor’s/Master’s degree in Computer Science, Engineering, or related field
- 8+ years of professional experience in Java development
- Strong expertise in Core Java, OOPS, and Multithreading
- Hands-on experience with Spring concepts (Spring Core, Spring MVC, Spring Boot preferred)
- Proficiency in SQL and database design (MySQL, Oracle, PostgreSQL, etc.)
- Solid understanding of software development life cycle (SDLC) and Agile methodologies
- Strong analytical, problem-solving, and communication skills
🌟 Why Wissen?
Join a company that combines start-up agility with enterprise stability. Work alongside some of the brightest minds from institutions like MIT, Wharton, IITs, IIMs, and NITs. Be part of mission-critical projects for Fortune 500 giants, and grow in a culture that invests in your future.
Job Description
- 3+ Years Java/JEE development experience in an enterprise.
- Experience in Grails Web Framework and Groovy Language will be a plus.
- Must have experience integrating Grails code with front-end JavaScript frameworks including Jquery.
- Must have experience working with XML and JSON using Grails or JMS and Web, services, XML, Apache Tomcat, SQL and Unix and GIT.
Qualifications
- Experience with RDMS concepts and SQL.
- Experience with RESTful Web Services.
- Understanding of proper application design techniques and methodologies.
- Proficient understanding of SDLC processes desired – Agile
Key roles:
· Develop backend application with clean code practices foe the application
· Collaborate with frontend developers to integrate user-facing elements with server side logic
· Troubleshoot and debug application
· Gather and address technical and design requirements
· Build reusable code and libraries for future user-facing
· Communicate with other third-party team for collaborations
Skillset:
· Core Java - Hands on experience with Jdk 11 and above
· Experience with code hosting and collaboration tools like Bitbucket/Github/GitLab
· Microservice architecture - Rest API calls, inter-service exception handling
· Non-relational DB - MongoDB basic DB commands to insert, update, delete, find records and Indexing
· Springboot framework - Spring Data JPA, ORM
· Event driven architecture - Kafka
· Tools like Postman, Jenkins, Doppler, IDE, MongoDB atlas
Qualifications:
· UG: B.Tech/B.E. in Any Specialization, B.Sc in Any Specialization, BCA in Any Specialization
· PG: Any Postgraduate
- Having around 8+ years of Experience in IT industry in Software Development.
- Sound knowledge in Core Java
- Having work experience in SDN/NFV, Orchestration
- Having work experience in Open source and Open Flow Controller(SDN).
- Experience in Aglie methodology.
- Good Knowledge on MySQL ,Postgresql or any Timeseries DB,Kafka, Zookeeper
- Good Knowledge on ONOS, ODL (OpenDaylight) OpenKilda,Mininet.
- Having work experience in MVT/MVC architecture.
- Having good knowledge networks, devices, service modeling and automation in systems.
- Having work experience on API & JSON implémentation.
- Knowledge in OpenStack,Ansible, Shellscript, Chef, Puppet,
- Good Understanding of Software Development (i.e. SDLC)
- Good team player enthusiastic and quick learner
- Good interpersonal skill, commitment, result oriented with a quest and learn new technologies and understanding challenging tasks
- Knowledge in AWS, AZURE Cloud
Rejolut is among the fastest-growing and award winning Tech companies working on leading technologies namely Blockchain, Machine Learning & Artificial Intelligence, Complex mobile & Web Apps, IoT, etc.Rejolut is a venture-backed company with clients in over several countries namely Malaysia Airlines,gba global,my-earth,biomes, Dlg-hub,etc.
We are looking for Tech geeks having hands-on experience and in love with building scalable, distributed and large web/mobile products and tech solutions. He/She must be an excellent problem solver with passion to self-learn and implement web technologies (frontend + backend). He/She would be responsible for the architecture design, code review, and technology build and deployment activities of the product.
Responsibilities:-
- Own the product development from scratch.
- Architect scalable, distributed and large-scale web and mobile solutions from scratch.
- Code for fresh development and to troubleshoot and resolve issues.
- Writing reusable, testable, and efficient code.
- Creating database schemas that represent and support business processes.
- Design and implementation of low-latency, high-availability, and performant applications.
- Able to learn & implement new technology/framework/library at God Speed.
- Customer-focused, react well to changes, work with teams and be able to multitask.
- Experience and knowledge of open-source tools and frameworks, broader cutting edge technologies around server side development.
Desired Candidate Profile:-
- A Bachelor's degree in Computer Science or related field(or combined with related experience)
- Strong Expertise in Node.js/Javascript
- Hands-on experience in writing Node.js applications
- Deep knowledge of Restful APIs, Web Services, command-line programs and solid design principles.
- Knowledge of Node.js and frameworks like Express.js,Sails.js,StrongLoop, Meteor,Loopback.js, etc
- Knowledge of SQL and NoSQL database(MongoDB)
- Knowledge of tools like Docker, Git, Postman, JSdocs, etc.
- Well versed with front-end technologies - HTML5, and CSS3, AWS, GCP, Azure, Good hold on CLI command, OS
- Proficiency in multiple programming languages, both dynamic(Javascript, Python, Ruby, etc.) and strongly typed object-oriented language.
- Implementing automated testing platforms and unit tests.
- Must be a proven performer and team player that enjoys challenging assignments in a high energy, fast growing and start-up workplace.
- Good communication and interpersonal skills
Rejolut - As a Career Differentiator
- We are a young and dynamic team who are obsessed with solving futuristic and evolutionary business problems at scale with the next generation technology like blockchain, crypto and machine learning. Focuses on empowering people across the globe to be technically efficient, making advancements in technology and providing new capabilities that were previously thought impossible.
- We provide exposure to higher learning opportunities so that you can work on complex and cutting edge technology like React, React Native, Flutter, NodeJS, Python, Go, Svelte, WebAssembly. Strong expertise in blockchain and crypto technology and working with the networks like Hedera Hashgraph, Tezos, BlockApps, Algorand, Cardano.
- We maintain high end transparency with clients and employees as Visibility unlocks Efficiency and trust unlocks Visibility.
- Company is backed by two technology Co-founders, well-versed with consumer applications and their work has been downloaded millions of times and have led teams in leadership positions in companies like Samsung, Purplle, Loylty Rewardz.
Benefits :
> Health Insurance
> Work from Home
> Fast growth and more visibility into the company
> Experience to work on the latest technology
> Competitive Learning Environment with supportive co-workers
> Employee friendly HR Policies
> Paid leaves up to certain limits
> Competitive salaries & Bonuses
> Liberal working atmosphere
> Get mentored by the best in the industry
Schedule:
- Day Shift/Flexible working hours
- Monday to Friday
Recently Expertrons raised a funding of $2.3 Mn in the Pre Series A round witnessing investors like Yoga Capital, Venture Catalysts, Auxano Capital, and existing investors LetsVenture, Ivycap Ventures, Iceland Venture Studios, Nikhil Vora (MD, Sixth Sense), and more.
Website: https://www.google.com/url?q=https://www.expertrons.com/&sa=D&source=editors&ust=1632121892142000&usg=AFQjCNHrV5rXdGMrOg122V0uheUES199uw">https://www.expertrons.com/
Expertrons Android App: https://www.google.com/url?q=http://bit.ly/expertrons&sa=D&source=editors&ust=1632121892142000&usg=AFQjCNGPySWJi-oUbq2znsqtcN9KMxdcnQ">bit.ly/expertrons
Product Demo Video: https://www.google.com/url?q=https://bit.ly/ProductDemo_Expertrons&sa=D&source=editors&ust=1632121892142000&usg=AFQjCNEszDynXjNJRxVfeuhH95YB9WcI8Q">https://bit.ly/ProductDemo_Expertrons
Watch Explainer Video: https://www.google.com/url?q=https://bit.ly/Explainer_Expertrons&sa=D&source=editors&ust=1632121892142000&usg=AFQjCNGSyGd1xSX8DaQcCv2jj0Kr8hzgUg">https://bit.ly/Explainer_Expertrons
It is good to have an understanding of Design Patterns and mandatory OOP principles
Role:
1. Passionate software developer with 3+ years of hands-on software application development experience
2. Experience designing and developing service-based architectures, microservices, and cloud-native applications
3. Demonstrated Experience or good understanding in Cloud Computing using AWS, GCP or other cloud providers
4. Containerization experience with applications deployed on Docker or Kubernetes
5. Demonstrated knowledge of Distributed and Scalable systems
6. Experience with Git or other version control systems Test-driven development (TDD)
7. Ability to quickly adapt & independently work in a fast-paced Agile environment with minimum supervision
8. Excellent communication and interpersonal skills. Articulates thoughts and ideas clearly, concisely, and persuasively
9. A self-starter with demonstrated ability to take initiative, who can proactively identify issues/opportunities and recommend action
Responsibilities:
1. Design and develop highly scalable, highly available, reliable, secure, and fault-tolerant systems with minimal guidance for one of the fastest-growing companies in India
2. Translate business requirements into scalable and extensible design
3. Pair with team members on functional and non-functional requirements and spread design philosophy, goals and improve the code quality across the team
4. Partner with the product management team to define and execute the feature roadmap
5. Coordinate with cross-functional teams (Mobile, UX, etc.) on planning and execution.
6. Proactively manage stakeholder communication related to deliverables, risks, charges, and dependencies
7. The building of all server-side logic, definition, and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end
Skill Requirements:
1. Understanding of JavaScript/Object-Oriented JS
2. Hands-on Node JS and related frameworks such as Express.js.
3. Good hold on MongoDB and Redis caching.
4. Experience in Unit testing frameworks like Mocha/Chai.
5. Proficient understanding of code versioning tools, such as SVN or GIT
6. Worked on API-driven micro-services architecture
You can apply for the position:
1. Preferred available for full-time in-office employment (Office Location - Andheri, Mumbai)
2. Preferred work from office
3. Preferred Can join immediately
4. Preferred a personal laptop
5. Have the relevant skills and interests
Rewards:
1. Entrepreneurial Exposure
2. Letter of Recommendation
3. Become a part of an elite group of innovators
4. ESOP opportunity based on Interview interaction
5. Grow up to 10X in 3 years
The idea is not to live forever, but to create something that will!
Be a part of our growing team and climb up the ladder of success. So, if you have the expertise, skills, quirks that can help you add value to Expertrons, then apply with us, now!
Responsibilities:
- Build reusable code and libraries for future use.
- Own & build new modules/features end-to-end independently.
- Collaborate with other team members and stakeholders.
Requirements:
- Thorough understanding of Node.js, JavaScript, its quirks, and workarounds.
- Excellence in at least one framework like strongloop loopback, express.js, sail.js etc.
- Excellence in at least one Javascript framework like Angular, vue.js, Ember, React or Backbone.
- Basic architectural understanding of modern day web applications.
- Diligence for coding standards.
- Must be good with git and git workflow.
- Experience of external integrations is a plus.
- Working knowledge of AWS, GCC, Azure.
- Expertise with linux based systems.
- Experience with CI/CD tools like jenkins is a plus.
- Experience with testing and automation frameworks.
- Extensive understanding of RDBMS systems.
- Interpersonal Go-getter attitude and a passion for making killer web applications.
- Good communication and interpersonal skills.
- Ability to work in a high pressure environment.
- Ability to quickly understand complex problems and devise effective solutions.
- Knowledge of D3/NodeJS/AngularJS/lodash etc.
- Experience on Cloud as a platform or Infrastructure.
- Inclination to application design standards.



