
About Card91
Card91 is simplifying business payments by providing a plug and play issuance infrastructure to businesses for domestic and cross-border payments. Our full stack platform enables businesses to gain control and visibility into their payment flows, controlling the entire payment lifecycle from onboarding, to issuance, to transaction and data reconciliation. The platform aims to provide holistic solutions around payment issuance and distribution management. Our deep focus in payments will help us in bringing new issuance formats as well as technologies to businesses.
The company has been founded by seasoned technology entrepreneurs who have founded successful companies like Myntra, Mastiff Tech earlier. Headquartered in Bangalore, with presence in Mumbai and NCR, Card91 aims to disrupt the payment infrastructure space in the issuer-processor segment.
About the role
Our core issuance and processing system runs on Java. This system is responsible for powering the card issuance and management user experience as well. We are using Spring Boot stack for building our services.
The issuance backend team will be a small team of 2-4 developers, with a meaty responsibility to bring the user experience to life. It will be a hands-on role where every member of the team enjoys writing high quality code, and thrives on each other's experience.
If the following broad attributes sound like you, we would love to talk to you
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4-6 years experience in backend services in Java.
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Strong understanding of relational databases.
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Ability to develop clean data models for complex problem domains.
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Pragmatic approach to architecture and design - knowing when it is ok to deviate from
said best practices in the interest of practicality.
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Above average writing and communication skills in English. Enjoy writing crisp and understandable documentation.
Why you should join
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You enjoy working in smaller teams. We are a startup, and we believe that smaller teams are a super-power. There is lesser management overhead, and more talk about the work that matters.
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You care about end-user and developer experience - and how the backend impacts that. Working backwards from what the user experience demands, rather than giving up to the path of least resistance.
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We pay well (above market average). We are sufficiently capitalised by some prestigious investors in the Fintech space and we are looking at the long game. It is a fun and exhilarating journey ahead and we look forward to having some great team mates!

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Job Description
We are looking for a hands-on Tech Lead – Java with strong software engineering fundamentals, a deep understanding of Java-based backend systems, and proven experience leading agile teams. This role involves a balance of individual contribution and technical leadership — mentoring developers, designing scalable architectures, and driving the success of product delivery in fast-paced environments.
Key Responsibilities
- Lead the end-to-end design, development, and deployment of Java-based applications and RESTful APIs.
- Collaborate with product managers and architects to define technical solutions and translate business requirements into scalable software.
- Guide and mentor team members in best coding practices, design patterns, and architectural decisions.
- Drive code reviews, technical discussions, and ensure high code quality and performance standards.
- Troubleshoot critical production issues and implement long-term fixes and improvements.
- Advocate for continuous improvement in tools, processes, and systems across the engineering team.
- Stay up to date with modern technologies and recommend their adoption where appropriate.
Required Skills
- 5+ years of experience in Java backend development with expertise in Spring/Spring Boot and RESTful services.
- Solid grasp of Object-Oriented Programming (OOP), system design, and design patterns.
- Proven experience leading a team of engineers or taking ownership of modules/projects.
- Experience with AWS Cloud services (EC2, Lambda, S3, etc.) is a strong advantage.
- Familiarity with Agile/Scrum methodologies and working in cross-functional teams.
- Excellent problem-solving, debugging, and analytical skills.
- Strong communication and leadership skills.
About HummingWave
HummingWave is a leading IT product development company specializing in building full-scale application systems with robust cloud backends, sleek mobile/web frontends, and seamless enterprise integrations. With 50+ digital products delivered across domains for clients in the US, Europe, and Asia-Pacific, we are a team of highly skilled engineers committed to technical excellence and innovation.
Thanks
The ideal candidate is a self-motivated, multi-tasker, and demonstrated team-player. You will be a lead developer responsible for the development of new software products and enhancements to existing products. You should excel in working with large-scale applications and frameworks and have outstanding communication and leadership skills.
Qualifications
- 2-4 years of relevant experience in developing complex enterprise applications using Java, Spring Boot, Message Queues ( like Apache Kafka, RabbitMQ, etc...),Multithreading, and SQL
- Ability to write high-quality code with speed
- Should have experience in building various end to end feature
- Product and startup background is preferred
- Have a good understanding of SDLC, Agile, and design patterns
- Have a working experience with Github and Jira tool
- Should be able to mentor and lead the team in fast-paced environments.
- High growth\Startup mindset
- Open Source contribution\Active Git profile big plus
- Interest in cloud security is a big plus
- Experience developing data center applications in cloud security, backup, and disaster
- recovery, is a big plus
- Knowledge of AWS\Azure is a big plus
InnovationM is looking for a Java Developer with experience in Spring Boot, Microservices, and MongoDB to join our team. The ideal candidate should have hands-on experience in designing and developing REST APIs using Spring Boot, building microservices-based applications, working with MongoDB and have experience in deploying applications in AWS.
What you must be good at:
● Develop and maintain REST APIs using Spring Boot framework
● Build microservices-based applications using Spring Boot and related frameworks
● Design and develop data models and queries for MongoDB database
● Deploy applications in AWS using EC2, ECR, and other relevant AWS services
● Work in an Agile development environment
● Collaborate with cross-functional teams to deliver high-quality software
What you must be good at:
● 4+ years of experience in Java development
● Strong experience in Spring Boot and related frameworks
● Hands-on experience in building microservices-based applications
● Proficient in designing and developing REST APIs
● Strong experience in MongoDB, including data modeling and query optimization
● Good understanding of AWS services and deployment methodologies
● Experience working in an Agile development environment
● Proficient in Git and version control systems
skills needed:
java
springboot
microservices
kafka/rabbitmq
jpa
- Design, develop and maintain applications and features.
- work on a huge dataset of IoT data and create algorithms to extract meaningful information.
- Adding features to the existing applications for monitoring and supporting field operations.
- Implementing application testability and diagnostics and fixing bugs.
- Create/ deploy and follow CI/CD pipelines to manage deliveries
UserExperior is a fast-growing, well-funded software product start-up based in
Mumbai with marquee clients from India in its portfolio. UserExperior empowers
product teams to build great applications for their customers. At UserExperior we are
focused on building the best mobile app analytics platform. As part of our engineering
team, you will be working on exciting & challenging problems. We are looking for
talented, enthusiastic and self-driven software engineers who are passionate about
software engineering and want to build great products.
Roles & Responsibilities :
● You’ll work as part of the software engineering team along with other front-end,
back-end, mobile app, QA teams & you will also closely work with the founder.
● You should be able to take the ownership of a project end to end.
● Your primary focus will be to build, implement & maintain the complete back-end
stack of the product.
● You will create production grade code and will implement the solutions which run
bug free.
● Participate in product development discussions and product development
road-maps.
● Collaborate with members across departments to identify and build on
improvements to product, process and systems.
Required Experience and Qualifications:
● 2 to 6 years of software development experience.
● Experience of working on application architecture design will be preferred.
● Experience of working in at least 1 or 2 projects, managing or leading the entire
tasks.
● Experience in Docker/Kubernetes, Agile methodologies & CI/CD automation
process.
● Knowledge of Queueing technologies like Kafka, RabbitMQ, ActiveMQ, Version
control using Git.
● Experience in microservices architecture, in-memory systems like Redis and
basic knowledge of Linux/Unix systems.
● Experience of building applications processing large volumes of streaming data
will be preferred.
● Experience from a middle size company or from a startup will be preferred.
● BE/MCA/MSc in Computers/Information technology with a good academic
record.
Key Skills:
● Java, & Spring boot
● Hibernate
● Spring Boot JPA
● Object Oriented Programming
● MySQL & MongoDB
● Jenkins
Perks & Benefits:
● Great learning, innovative and development platform.
● Remote work and flexible timings.
● Reimbursement of the online learning courses on certification.
● Medical insurance coverage for you and the dependence.
● Five Working days per week.
Role Description :
- Good Understanding of Java 8 with proven hands-on skills
- Experience in Spring Framework - Spring Boot, Spring Data, Spring REST
- Experience in Spring Reactive
- Experience in Git, Gradle / Maven
- Practitioner of clean code and SOLID principles
- Able to test drive features
- Can debug code at ease and ensure quality code is produced
- Knowledge of design patterns
- Comfortable with agile practices, user stories and task breakdown
- Understands REST principles and Micro services
- Experienced with technologies such as
- Required Java, Spring Boot
- Good to have Maven, GIT, Swagger, PCF, Rabbit MQ
- Good API skills technology such as Rest Webservice
- Good foundation in data structures, algorithms and OO Design with rock solid programming skills
- Experienced on creating unit test using JUnit, Mockito or PowerMock
- Experienced on mark up language such as JSON and YML
- Experienced on using Quality and Security scan tools such as Sonar, Fortify and WebInspect
- Experienced on agile methodology
Who are able to work individual as well as Team work with Good Speed and accurecy.











