Software Engineer – Back End, Payments

Tillster

. Build and maintain integrations with card-present payment providers including Adyen, Shift4, and Global Payments for Tillster's self-service kiosk platform .

Posted 11/3/2026full-timeSan Diego • California • United StatesJuniorMid-Level💰 $105,000 - $135,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in backend development with a focus on payment integrations, ensuring PCI DSS compliance and implementing comprehensive testing strategies. Proficient in troubleshooting payment issues and collaborating with stakeholders to enhance platform architecture.

Highest-signal resume keywords

Backend Development ExperiencePayment Processor IntegrationPCI DSS ComplianceUnit Testing and TDDJava Programming

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

JavaObject-Oriented ProgrammingUnit TestingIntegration TestingEnd-to-End TestingPayment Gateway API IntegrationEMV UnderstandingContactless PaymentsDebugging SkillsSecurity Best Practices

Soft Skills

Strong Verbal CommunicationStrong Written CommunicationAnalytical SkillsProblem-Solving SkillsAdaptability

Tools & Technologies

AWS Serverless TechnologiesDynamoDBSQSP2PETokenization

Industry Keywords

Payment ProcessingTransaction LifecycleAuthorization and Settlement FlowsAgile DevelopmentCollaborative Environment

Tech Stack

Tools & technologies

AWSDynamoDBJava

About the role

Key responsibilities & impact

Build and maintain integrations with card-present payment providers including Adyen, Shift4, and Global Payments for Tillster's self-service kiosk platform
Own the full transaction lifecycle: authorization, capture, voids, refunds, reversals, and reconciliation
Implement recovery from timeouts and partial failures
Work with processor certification teams to get integrations certified and into production
Keep payment flows PCI DSS compliant, minimizing scope through P2PE and tokenization
Troubleshoot live payment issues across terminals, kiosks, and backend services
Implement unit, integration, and end-to-end tests; work toward high test coverage and adopt TDD where applicable
Conduct and participate in code reviews, including evaluating AI-generated code for security and correctness
Participate in design sessions to improve platform architecture
Work with stakeholders and product owners to understand requirements and develop solutions
Contribute to an agile, collaborative, and high-performing development environment
Expand technical knowledge through Tillster's learning and development resources

Requirements

What you’ll need

2 to 5 years of backend development experience in Java or a comparable object-oriented programming (OOP) language
Experience implementing comprehensive testing strategies, including unit tests, integration tests, and end-to-end tests
Hands-on experience integrating with at least one payment processor or gateway API; card-present or terminal integration strongly preferred
Understanding of EMV, contactless payments, and authorization and settlement flows
Working knowledge of PCI DSS and secure handling of payment data
Comfortable debugging across network, device, and service boundaries
Ability to communicate effectively in English, with strong verbal and written communication skills
Understanding of security best practices, including OAuth, JWT, encryption, and related technologies
Bachelor's degree in Computer Science or a related field, or equivalent professional experience
Prior experience with AWS serverless technologies and companion services such as DynamoDB and SQS is beneficial but not required
Strong analytical and problem-solving skills
Comfortable working in a fast-paced, dynamic environment and handling ambiguity and changing requirements
Must be in San Diego, CA
No visa transfers or sponsorships available

Benefits

Comp & perks

Medical, dental, vision, and FSA benefits
Healthcare and Dependent Care reimbursement programs
Employee Assistance Program (EAP)
Optum Care 24-hour confidential medical counseling services
Ten paid holidays per calendar year
15 days of PTO in the first 12 months of continuous service
22 days of PTO in subsequent years
Prorated PTO for eligible part-time employees
401(k) Plan eligibility effective with employment start date
College tuition and education assistance programs
Udemy Learning courses
Ongoing learning and development opportunities