Senior Software Engineer - Payments

FastSpring is the world's leading ecommerce platform for software and SaaS companies, focused on enhancing the selling of digital products. They are looking for a Senior Software Engineer to join their Payments team to design and develop systems for payment processing, subscription billing, and reporting.

Responsibilities:

• Working within our agile software development teams, lead design and development of product features for highly available payment processing, subscription billing, and reporting platforms
• Lead integrations with external platforms such as payment processors, card networks, and alternative payment methods (APMs)
• Ensure a robust software delivery process through clear procedures as well as automated build, test, and deployment capabilities
• Debug and troubleshoot complex issues, optimize system performance, and ensure reliability across money-movement flows
• Reduce time to market by decomposing large feature requirements into small development tasks suitable for incremental releases
• Participate in design and code review with other team members
• Mentor junior members of the development team
• Manage software issues through tickets according to product development priorities
• Lead the adoption of best practices for coding standards, testing, and deployment
• Work with other FastSpring team members — Product, Risk, Finance, and Compliance — to understand and incorporate business and regulatory requirements (PCI-DSS, PSD2/SCA, 3DS2) into product solutions
• Flexible hours to work with local and remote team members on feedback and requirements
• Respond to production issues and apply continuous improvement techniques to fully resolve them

Requirements:

• 10+ years of software development experience delivering commercial SaaS solutions using Java
• Experience in the Payments industry and/or integrating with a third-party payment API is a plus
• Passionate problem solver with a proven track record of delivering high-quality software solutions
• 4+ years of experience with SQL (PostgreSQL) and NoSQL storage
• 3+ years of experience implementing RESTful service-oriented architectures with public APIs
• HTML / CSS / JavaScript / Angular experience; Vue a plus
• Unit testing, mocking, and automation experience
• 3+ years experience with Amazon Web Services, including EC2, S3, RDS, DynamoDB; experience with Lambda is a plus
• Experience with Linux; experience with containers & Docker is a plus
• Comfortable using AI-assisted development tooling — our engineers use Claude Code day-to-day to accelerate design, implementation, and review
• Bachelor's or Master's degree in Computer Science or equivalent experience