About us:
Equal parts creative agency, engineering firm, and consultancy, Grappus has a reputation of doing things differently. We work with brands big and small, far and wide, helping them understand, prototype and deploy a broad range of custom tech. We value design and we cringe at bad UX. Each project is a clean slate, we don’t have frameworks, or any pre-made formulas. We’re not here to just grow big, make money and win awards. We’re here to crack the process of building truly innovative products from scratch. Products that make people say ‘damn’.
People at Grappus usually experience a highly accelerated career growth well beyond the narrow constraints of their ‘job description’. Here, the growth ladder is tailored to you. It operates exactly as fast as you can manage to grow. We think it's a waste when smart people are unable to make an impact. Our aim is to unleash your potential by giving you massive challenges and the freedom to solve them.
We’re in a fluid world, where we don’t know what technologies we’ll use next, or the projects we’ll work on. We’re actively searching for ways to shine a light on our blind spots, whether it is in the products we want to build, the problems we like to solve, or the company culture we try to create. That’s what makes life at Grappus so exciting. Grappus is an ongoing experiment and you are a part of it. We'll be a different company a few years from now because you are going to change it for the better. We can’t wait to see where you take us
Learn more about us: https://grappus.com/">https://grappus.com/
About the role:
We are seeking a Senior Java Developer who has a knack for coming up with creative solutions to unique problems, planning development cycles and writing technical documentation while leading a team of developers. You can get in where needed to write clean, reusable, and performant code, with creative sensibilities to push projects towards perfection. You should have good time management skills and be able to work both autonomously and collaboratively with a cross-discipline team of product managers, strategists, UX designers, art directors, and developers. Most importantly, you have an eye for detail and the ability to make beautiful designs come to life through code.
What we’d like to see:
- Ability to write elegant and readable code
- Excellent problem solving skills and love technical challenges
- Comfortable working in a team-oriented and collaborative environment
- Strong understanding of Agile and Lean software development processes and practices
- Stays plugged into emerging technologies/industry trends and applies them proactively
- Knowledge of software best practices, like test driven development and continuous integration
Must Have:
- BE/BTech in Computer Science or a related field or equivalent practical experience
- 2+ years of software development experience including deep, hands on experience in building back end applications using Java and Spring ecosystem
- Strong command over core Java:
- Understands the application of java best practices including logging & exception handling
- Familiar with the Java Concurrency model
- Understands Java collections, generics and java 8 based functional programming features
- Has extensively used the Spring ecosystem:
- Spring Boot
- HTTP/REST API development
- Spring Data (JPA)
- ORM tools like Hibernate (can fine tune mappings for performance)
- Unit and integration testing facilities of Spring Boot
- Experience coaching and mentoring junior developers
- Aggressive problem diagnosis and creative problem solving skills and client handling skills
- Ability to work and thrive in a fast-paced environment, learn rapidly and master diverse web technologies and techniques
- Excellent knowledge of Relational Databases, SQL and ORM technologies (JPA2, Hibernate)
- Implemented CI/CD in any of the projects done and experience with Test Driven Development
Nice to Have:
- Understanding of API Development best practices
- Knowledge of Kubernetes/Docker and Devops
- Some or all of these AWS services: EC2/ECS; lambda; SQS/SNS; API Gateway, Cognito; Elastic Search
- Has contributed to the development or enhancement of CI/CD pipelines in a previous project
- Contributed in the creation of end-end automation tests (functional or non-functional)
- Has designed relational databases; conversant with SQL
- Personal projects or contributions to the open source community
- Strong organizational skills to juggle multiple tasks within the constraints of timelines
- Team player (those great personality types that people love to work with)
- Great communication skills

About Grappus
About
With a team comprising of tech enthusiasts, we are a high energy startup exploring the domains of emerging mobile market. Looking for a smart, sexy and intuitive mobile app to bring a significant impact to your business? We, at Grappus are committed to deliver innovative mobility solutions that surpasses customer expectations - building brand loyalty and nurturing continuous engagements. Our collaborative approach brings digital strategy to life through our custom-built versatile solutions fortified to meet your ever changing business environment. We strive to build high quality products for startups and enterprise clients across iPhone, iPad, Android and the web. With a valuable experience and knowledge of the mobile market along with our passion towards technology, we bring complete perfection to our work.
Connect with the team
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Review Criteria
- Strong Senior Backend Engineer profiles
- Must have 5+ years of hands-on Backend Engineering experience building scalable, production-grade systems
- Must have strong backend development experience using one or more frameworks (FastAPI / Django (Python), Spring (Java), Express (Node.js).
- Must have deep understanding of relevant libraries, tools, and best practices within the chosen backend framework
- Must have strong experience with databases, including SQL and NoSQL, along with efficient data modeling and performance optimization
- Must have experience designing, building, and maintaining APIs, services, and backend systems, including system design and clean code practices
- Experience with financial systems, billing platforms, or fintech applications is highly preferred (fintech background is a strong plus)
- (Company) – Must have worked in product companies / startups, preferably Series A to Series D
- (Education) – Candidates from top engineering institutes (IITs, BITS, or equivalent Tier-1 colleges) are preferred
Role & Responsibilities
As a Founding Engineer at company, you'll join our engineering team during an exciting growth phase, contributing to a platform that handles complex financial operations for B2B companies. You'll work on building scalable systems that automate billing, usage metering, revenue recognition, and financial reporting—directly impacting how businesses manage their revenue operations.
This role is perfect for someone who thrives in a dynamic startup environment where requirements evolve quickly and problems need creative solutions. You'll work on diverse technical challenges, from API development to external integrations, while collaborating with senior engineers, product managers, and customer success teams.
Key Responsibilities-
- Build core platform features: Develop robust APIs, services, and integrations that power company’s billing automation and revenue recognition capabilities
- Work across the full stack: Contribute to both backend services and frontend interfaces, ensuring seamless user experiences
- Implement critical integrations: Connect company with external systems including CRMs, data warehouses, ERPs, and payment processors
- Optimize for scale: Build systems that handle complex pricing models, high-volume usage data, and real-time financial calculations
- Drive quality and best practices: Write clean, maintainable code while participating in code reviews and architectural discussions
- Solve complex problems: Debug issues across the stack and work closely with teams to address evolving client needs
The Impact You'll Make-
- Power business growth: Your code will directly enable billing and revenue operations for fast-growing B2B companies, helping them scale without operational bottlenecks
- Build critical financial infrastructure: Contribute to systems handling millions in transactions while ensuring accurate, compliant revenue recognition
- Shape product direction: Join during our scaling phase where your contributions immediately impact product evolution and customer success
- Accelerate your expertise: Gain deep knowledge in financial systems, B2B SaaS operations, and enterprise software while working with industry veterans
- Drive the future of B2B commerce: Help create infrastructure powering next-generation pricing models from usage-based to value-based billing.
What we Require
We are recruiting technical experts with the following core skills and hands-on experience on
Mandatory skills : Core java, Microservices, AWS/Azure/GCP, Spring, Spring Boot
Hands on experience on : Kafka , Redis ,SQL, Docker, Kubernetes
Expert proficiency in designing both producer and consumer types of Rest services.
Expert proficiency in Unit testing and Code Quality tools.
Expert proficiency in ensuring code coverage.
Expert proficiency in understanding High-Level Design and translating that to Low-Level design
Hands-on experience working with no-SQL databases.
Experience working in an Agile development process - Scrum.
Experience working closely with engineers and software cultures.
Ability to think at a high level about product strategy and customer journeys.
Ability to produce low level design considering the paradigm that journeys will be extensible in the future and translate that into components that can be easily extended and reused.
Excellent communication skills to clearly articulate design decisions.
This Is NOT a Typical Java Role If your experience is mostly CRUD APIs, controller wiring, or shallow service layers — this role is not for you. We are looking for a top tier backend engineer who thrives on:
* Designing complex algorithms
* Building high-performance, memory-efficient systems
* Owning deep backend logic that actually moves the needle
You will work close to the core engine of the product, not the edges.
What You’ll Be Trusted With
* Architect and build backend systems that must perform under load
* Design and implement custom algorithms for real-world, non-trivial problems
* Solve performance bottlenecks involving CPU, memory, I/O, and concurrency
* Build backend services where latency, throughput, and correctness matter
* Own document & PDF processing pipelines end-to-end:
-Composition
-Rendering
-Optimization
- High-volume generation
* Make hard technical decisions and stand by them
Non-Negotiable Skills
* Exceptional Java expertise (Core Java, Spring Boot, Java 8+)
* Strong command over:
- Data structures & algorithms
- Multithreading & concurrency models
- JVM internals & memory management
* Proven experience building custom algorithms (this will be evaluated)
* Deep backend engineering experience with Spring / Spring Boot
* Strong understanding of:
- API design principles
- Fault tolerance & resilience
- Performance tuning & profiling
* Ability to reason about time complexity, space complexity, and trade-offs
* Strong database fundamentals (query optimization, indexing, transactions)
* Experience with message brokers (ActiveMQ, Kafka, RabbitMQ)
* Exposure to Kubernetes-based deployments or large-scale microservices
Interview Focus (Be Prepared)
* Algorithm design & problem solving
* Deep Java fundamentals
* System design discussions (backend-heavy)
* Performance tuning scenarios
* Real-world debugging and optimization challenges
Job Description:
We are seeking a highly motivated and skilled Full Stack Java Developer with strong experience in backend and frontend development, cloud deployment, and modern DevOps practices. The ideal candidate will have a solid background in Java/J2EE technologies, hands-on experience in developing microservices on AWS, and a good understanding of CI/CD pipelines and monitoring tools.
Key Responsibilities:
- Design, develop, test, and maintain scalable web applications and microservices.
- Implement backend logic using Core Java, J2EE, Spring Boot, Spring Batch, JPA, and REST APIs.
- Build responsive UIs using React, HTML, CSS, and integrate them with backend services.
- Develop and deploy microservices using AWS services like ECS, EC2, S3, API Gateway, Aurora, ALB, and Route 53.
- Participate in Agile development processes, including sprint planning, stand-ups, and retrospectives.
- Write unit and integration tests using JUnit and Cucumber.
- Monitor application performance using APM tools and analyze logs using Splunk or similar tools.
- Implement CI/CD pipelines using Jenkins, Maven/Gradle, and Git/Bitbucket.
- Work with containerization and orchestration tools like Docker and Kubernetes.
- Collaborate with cross-functional teams using tools like JIRA and Confluence.
Required Skills & Experience:
- Strong hands-on experience in Java/J2EE application development.
- Proficiency in Spring frameworks (Spring Boot, Batch) and RESTful services.
- Frontend development experience with React, HTML, CSS.
- Solid experience with AWS cloud technologies and deployment practices.
- Experience in writing and maintaining automated tests with JUnit and Cucumber.
- Knowledge of APM tools and log analysis tools (e.g., Splunk).
- Familiarity with CI/CD pipelines and tools (Jenkins, Maven/Gradle, Git).
- Experience with Docker and Kubernetes.
- Excellent problem-solving, debugging, and analytical skills.
- Good communication skills and ability to work in Agile teams.
Preferred Qualifications:
- AWS certification is a plus.
- Experience with Amazon Aurora and API Gateway in production environments.
- Knowledge of SOA, messaging systems (e.g., MQ), and security best practices.
Looking for candidates only with tier 1 colleges OR have experience in a product-based company.
Desired Skills :
● Experience with data modeling and SQL/NoSQL databases
● Experience with distributed systems and microservices
● Good experience in working with any of Java/SpringBoot, GoLang or NodeJS
● Excellent problem solving and debugging skills
● Passionate about the experience of software engineering as much as the output
● A strong sense of ownership
● Ability to communicate your ideas and approach to solving problems with clarity
Skills Required:
- 4+ years of technical experience in a developer role
- Strong proficiency with Core Java
- Database experience preferably with DB2, Sybase, or Oracle
- Complete SDLC process and Agile Methodology (Scrum)
- Strong oral and written communication skills
- Excellent interpersonal skills and professional approach
- Bachelor’s degree in Computer Science, MIS, or other technology/engineering discipline
Skill Desired:
-Strong proficiency with Scala on Spark
- Previous experience in front office and back office reports
- Strong understanding Order Life Cycle management from Equities or Listed derivatives perspective
- Previous experience in Trade Surveillance or working with data from the order lifecycle
- Good to have knowledge on Hadoop Technologies
- High quality software architecture and design methodologies and patterns
- Work experience as level-3 support for applications
- Layered Architecture, Component based Architecture
- XML-based technologies
- Unix OS, Scripting, Python or Perl
- Experience in development on other application types (Web applications, batch, or streaming)
Egen is a data engineering and cloud modernization firm helping industry-leading companies achieve digital breakthroughs and deliver for the future, today. We are catalysts for change who create digital breakthroughs at warp speed. Our team of cloud and data engineering experts are trusted by top clients in pursuit of the extraordinary. An Inc. 5000 Fastest Growing Company 7 times, and recently recognized on the Crain’s Chicago Business Fast 50 list, Egen has also been recognized as a great place to work 3 times.
You will join a team of insatiably curious data engineers, software architects, and product experts who never settle for "good enough". Our Java Platform team's tech stack is based on Java8 (Spring Boot) and RESTful web services. We typically build and deploy applications as cloud-native Kubernetes microservices and integrate with scalable technologies such as Kafka in Docker container environments. Our developers work in an agile process to efficiently deliver high value data driven applications and product packages.
Required Experience:
- Minimum of Bachelor’s Degree or its equivalent in Computer Science, Computer Information Systems, Information Technology and Management, Electrical Engineering or a related field.
- Have experience working and strong understanding of object-oriented programing and cloud technologies
- End to end experience delivering production ready code with Java8, Spring Boot, Spring Data, and API libraries
- Strong experience with unit and integration testing of the Spring Boot APIs.
- Strong understanding and production experience of RESTful API's and microservice architecture.
- Strong understanding of SQL databases and NoSQL databases and experience with writing abstraction layers to communicate with the databases.
Nice to have's (but not required):
- Exposure to Kotlin or other JVM programming languages
- Strong understanding and production experience working with Docker container environments
- Strong understanding and production experience working with Kafka
- Cloud Environments: AWS, GCP or Azure
- Building scalable, reliable, high-performing platforms
- Managing project priorities, deadlines, and deliverables
- Participating in the entire lifecycle including analysis, development, fixing and monitoring of issues on the assigned product lines
- Maintaining a high service levels in terms of security, performance, availability, and quality
- Establishing and implementing good development practices to create a top-class, results oriented engineering culture.
Requirements :
- 7 years - 10 years of solid hands on experience in J2EE & related technologies.
- Ability to think in terms of APIs all the time
- Hands on experience in object-oriented designs and principles.
- Hands on experience in data structures, algorithms & design patterns
- Hands on experience in server side, web architecture
- Working knowledge in Spring Framework
- Knowledge in data modeling and hands on experience with at least one RDBMS, MySQL is preferred.
- Knowledge on any of the scripting languages is desirable as you may need to write scripts Javascript, HTML or any front-end frameworks experience is desirable
- Understanding on NoSQL databases.
- You can extrapolate requirements from customers and product management and distinguish between what they need vs. what they want?
- You are always on the lookout for adding configurability and extensibility to your design.
- You cannot agree with not having ability to automatically test software.
- Usability of the solution keeps you awake at nights
Job Responsibilities:
* Design, build, and maintain efficient, reusable, and reliable Java code
* Ensure the best possible performance, quality, and responsiveness of the applications
* Identify bottlenecks and bugs, and devise solutions to these problems
* Help maintain code quality, organization, and automatization
* Prepare the technical design of complex technology components
Mandatory Skills:
* Proficient in Java (JDK 1.7) or above JDK 8 preferable, with a good knowledge of its ecosystems with a knack for writing clean, readable Java code, writing reusable Java libraries along with knowledge of concurrency patterns in Java
* Solid understanding of object-oriented programming along with various design and architectural patterns
* Hands on experience with Spring, Spring Boot, JUnit
* Familiarity with concepts of MVC, Microservices, RESTful
- Strong development experience in Core Java, J2EE, Spring Boot, Oracle SQL/PLSQL and App servers like WebLogic, JBOSS, Unix
- Good Knowledge of SOAP and REST API
- Should have knowledge in SOLID Principles & Design Patterns
- Should have working experience in UI like JSF, JSP, Html, CSS and Javascript / Jquery
- Experience with full-lifecycle development (i.e. design, coding, testing, debugging, etc.)
- Working experience to fix common vulnerabilities and security threat in SOA\Microservices applications
- Knowledge in OWASP Standards and Working knowledge in fixing security issues, data encryption and cryptography.
- Prior experience and knowledge of security tools like Fortify, Sonatype and webInspect is a plus
- Good to have knowledge and working experience in Angular JS
- Translate business requirements into detailed specs/designs
- Design thinking while arriving at solution
- Strong technical troubleshooting, diagnosing and problem-solving skills
- Ability to work with distributed teams in a collaborative and productive manner
- Solving complex business and workflow issues with solid scalable technical solutions
- Must be a self-motivated, proven performer who enjoy challenging assignments in a high-energy, fast growing workplace
- Agility and ability to adapt quickly to changing requirements and scope and priorities
- Good in communication, both written and verbal
- Should have Agile scrum experience.
- Team Player with very good attitude
- Attention to detail and focus on quality
- Knowledge in financial services domain is a plus
- Good to have knowledge on Static AppSec Testing (SAST) and Dynamic AppSec Testing (DAST)












