Kunai builds full-stack technology solutions for banks, credit and payment networks, infrastructure providers, and their customers. Together, we are changing the world’s relationship with financial services. At Kunai, we help our clients modernize, capitalize on emerging trends, and evolve their business for the coming decades by remaining tech-agnostic and human-centered.
We are seeking a Senior Software Engineer with expertise in Java, SpringBoot, MongoDB, and cloud solutions with a strong foundation in software architecture. In this role, you will work with a leading bank to build a modernized data platform that includes Data Standardization, Producer/Consumer Self-Service, APIs, Data Governance, and Core Services. The ideal candidate will be passionate about building performant, scalable, and maintainable systems and comfortable working in a modern, event-driven microservices environment. This role requires hands-on backend development skills, architectural insight, and the ability to navigate and improve large, complex codebases.
Key Responsibilities:
Design, develop, and maintain scalable backend services using Java and SpringBoot
- Data modelling focused on relational databases, MongoDB, or Neo4J
Cloud development experience in either on-prem or public cloud, with Docker and Kubernetes
Implement and optimize event-driven architecture with Apache Kafka, ensuring reliable and asynchronous communication between services
Collaborate with architects and senior engineers to review and enhance backend system architecture
Review and refactor large codebases, ensuring best practices in software design and performance optimization
Conduct code reviews, performance tuning, and troubleshoot issues across the stack
Maintain high standards of code quality, security, scalability, and maintainability
Required Skills:
10+ years experience in Java, Java Streams, and SpringBoot
- Significant database / data modelling experience either on relational databases, MongoDB, or Neo4J
Deep understanding of distributed systems, caching strategies, and scalability challenges
Strong understanding of software architecture, design patterns, and system design principles
Comfortable working with large codebases, including reviewing and refactoring code
- Cloud development experience either on-prem or public cloud, with Docker and Kubernetes
Preferred Skills:
Advanced experience designing and deploying Kafka-based messaging systems
Skilled in React and React Hooks for full-stack development when needed
Experience with distributed caching technologies
- Experience leading a team a strong plus
Salary Range: $125,000 - $175,000 annually
This range reflects the base salary that we reasonably expect to pay. Actual compensation may vary depending on relevant factors including experience, skills, and location.
Our success over the past 20 years is rooted in our exceptional team, which thrives in a culture of collaboration, creativity, and continuous learning.
We are proud to offer our employees a range of benefits, including competitive compensation, professional development opportunities, and flexible work arrangements, all designed to help them thrive. As we continue to expand, we remain committed to cultivating an environment where people feel valued, have a voice, and are given the tools to grow—both personally and professionally—while pushing the boundaries of innovation in the fintech industry.
Our success over the past 20 years is rooted in our exceptional team, which thrives in a culture of collaboration, creativity, and continuous learning.
We are proud to offer our employees a range of benefits, including competitive compensation, professional development opportunities, and flexible work arrangements, all designed to help them thrive. As we continue to expand, we remain committed to cultivating an environment where people feel valued, have a voice, and are given the tools to grow—both personally and professionally—while pushing the boundaries of innovation in the fintech industry.
Top Skills
Similar Jobs
.png)
.png)
What you need to know about the Boston Tech Scene
Key Facts About Boston Tech
- Number of Tech Workers: 269,000; 9.4% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Thermo Fisher Scientific, Toast, Klaviyo, HubSpot, DraftKings
- Key Industries: Artificial intelligence, biotechnology, robotics, software, aerospace
- Funding Landscape: $15.7 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Summit Partners, Volition Capital, Bain Capital Ventures, MassVentures, Highland Capital Partners
- Research Centers and Universities: MIT, Harvard University, Boston College, Tufts University, Boston University, Northeastern University, Smithsonian Astrophysical Observatory, National Bureau of Economic Research, Broad Institute, Lowell Center for Space Science & Technology, National Emerging Infectious Diseases Laboratories
