About this role.
FastSpring is hiring a senior Java engineer for its Payments team to build highly available systems for payment processing, subscription billing, settlement, refunds, and reporting. The role leads feature design, third-party payment integrations, production troubleshooting, and delivery-process improvements within an agile SaaS environment. It requires 10+ years of commercial Java development plus strong PostgreSQL/NoSQL, REST API, AWS, testing, Linux, and web development experience. The engineer will partner with Product, Risk, Finance, and Compliance to implement regulated payment capabilities, including PCI-DSS, PSD2/SCA, and 3DS2, while mentoring junior engineers.
Role DNA
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Job Complexity
5/5Pace & Pressure
4/5Autonomy Level
5/5Communication Load
4/5Salary analysis
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Core skills
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Sample interview questions
I would define clear API contracts, use idempotency keys for payment-changing requests, implement retries with exponential backoff for transient failures, and use asynchronous processing where appropriate. I would also persist request and response state, reconcile processor webhooks, monitor failure patterns, and provide operational tooling for safe replay and investigation.
I use an idempotency strategy spanning the client request, internal service, and processor call. A durable idempotency record keyed to the business operation stores the initial outcome, allowing repeated requests to return the same result rather than initiating another charge; database constraints and carefully designed state transitions provide additional protection.
I first assess customer impact, stabilize the system through rollback, traffic controls, or feature flags, and communicate status to stakeholders. I then use logs, metrics, traces, and transaction records to isolate the failure, validate the fix with targeted tests, and follow up with a blameless post-incident review, monitoring improvements, and corrective backlog items.
I would minimize the systems that handle sensitive card data, rely on tokenization and approved payment-provider capabilities, enforce encryption and least-privilege access, and maintain auditable controls. For PSD2/SCA, I would design clear authentication and challenge flows, support 3DS2 outcomes and exemptions, and work closely with Compliance and Risk to validate requirements before release.
I identify the end-to-end business flow, isolate independently deployable capabilities, and establish contracts and observability before enabling customer traffic. I use feature flags, backward-compatible schema and API changes, staged rollouts, and measurable acceptance criteria so each release reduces risk while moving toward the complete capability.
About FastSpring:
FastSpring is how AI, SaaS, gaming, software, and digital product companies sell online in more places around the world. We handle all payment needs from checkout to taxes so you can go farther faster.
Founded in 2005, we are a privately owned company headquartered in Santa Barbara with offices in Amsterdam, Austin, Belfast, Dublin, Halifax, and Singapore.
The Position:
FastSpring is looking for a Senior Software Engineer to join our Payments team, designing and developing the systems that power our industry-leading full-service ecommerce platform — payment processing, subscription billing, settlement, refunds, 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
Qualifications:
- 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
Consistent with FastSpring’s values and applicable law, we provide the following information to promote pay transparency and equity. The base pay range below represents a good faith estimate of the low and high end base pay range for the listed position. This role may be eligible for the corporate bonus plan (or, if a sales role, a commission plan as defined in the sales incentive plan document). In addition, FastSpring provides a variety of benefits to employees.
Estimated Base Pay Range
$175,000—$196,800 USD
About the Company:
FastSpring is an EQUAL EMPLOYMENT OPPORTUNITY/AFFIRMATIVE ACTION employer. Candidates are considered for employment with FastSpring without regard to their race, color, religion, national origin, age, sex, gender, pregnancy, disability, sexual orientation, gender identity, genetic information, military status, veteran status (specifically status as a disabled veteran, special disabled veteran, Vietnam Era veteran, recently separated veteran, armed forces service medal veteran, or other protected veteran) or other classification protected by applicable federal, state or local law.
AI Transparency Statement:
FastSpring may utilize artificial intelligence (AI) or automated tools during portions of the recruitment process to assist with operational and administrative activities, including candidate communications, scheduling, application organization, and interview documentation. These tools are designed to support efficiency and consistency within the hiring process. AI systems are not used as the sole determinant of hiring outcomes, and all employment decisions are made by qualified human reviewers. We are committed to responsible and fair hiring practices and continue to evaluate our use of technology accordingly.
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