Senior Software Engineer (Java | Spring)

Fullsteam is a leading provider of vertical software and embedded payments technology dedicated to helping businesses flourish by providing their customers with seamless experiences. The role involves modernizing and scaling salon management software, maintaining Java based web applications, and enhancing user experiences while collaborating with product and engineering teams.

Responsibilities:

• Own features end-to-end — from technical design and implementation to testing, deployment, and monitoring — across Java/Spring backend services, JSP frontend, and database layers
• Maintain and enhance Java/Spring Boot applications with emphasis on performance, scalability, and maintainability of business-critical salon management features
• Work with JSP, JavaScript, and CSS to create responsive, user-friendly interfaces while gradually modernizing frontend components where appropriate
• Design and implement RESTful APIs with proper authentication, error handling, and documentation; integrate third-party payment and service provider APIs
• Develop backend services using Spring Boot, including data modeling, database migrations, and complex business logic for salon operations (scheduling, payments, inventory, etc.)
• Work with relational databases (MySQL), including query optimization, indexing strategies, and effective use of JPA/Hibernate
• Improve system reliability & performance using caching strategies, background job processing, and database optimization techniques
• Contribute to DevOps practices: participate in CI/CD processes, environment configuration, deployment automation, and system monitoring
• Implement security best practices including authentication, authorization, data protection, and PCI compliance for payment processing
• Champion code quality through thorough code reviews, unit testing, and incremental refactoring of legacy code
• Collaborate with Product and Support teams to understand salon owner needs, troubleshoot issues, and deliver features that solve real business problems

Requirements:

• 5+ years building production web applications with strong Java expertise and Spring framework experience
• Spring Boot proficiency building REST APIs, services, and web applications with proper dependency injection and configuration management
• Frontend development experience with JSP, JavaScript, HTML/CSS, and jQuery; willingness to work with legacy frontend code
• Database expertise: SQL schema design, complex queries, performance tuning, and JPA/Hibernate experience
• Testing discipline: unit testing with JUnit/Mockito, integration testing, and basic end-to-end testing practices
• Version control & collaboration: Git workflows, code reviews, and agile development practices
• Production system experience: deploying Java applications, monitoring, logging, and troubleshooting in production environments
• API design and integration: RESTful services, JSON handling, and third-party API integration
• Cloud platforms (AWS)
• Message queues and caching (Redis, RabbitMQ) for performance optimization
• Microservices architecture experience for future platform evolution
• Mobile development knowledge for potential mobile app expansion