Senior Software Engineer – Payment Processing

This is a fully remote position, open to applicants in United States.

📋 Description

• Develop and implement automated, comprehensive transaction lifecycle tracking to eliminate the need for manual reconciliation.

• Create automated payment functionalities, including fraud detection and chargeback management.

• Collaborate across two parallel engine versions and processor integrations to address mismatches and reconciliation discrepancies.

• Work together with the storefront team to provide data that bridges reconciliation gaps.

• Prioritize quality, core-flow stability, and scalability as transaction volumes increase.

• Plan and contribute to a unified payments layer that integrates the payment processing engine, storefront, and events platform.

• Utilize AI-assisted development tools to navigate a large, undocumented, multi-repository codebase.

⛳️ Requirements

• Over 8 years of engineering experience, with a strong emphasis on backend engineering.

• Preferably experienced in financial reconciliation, ledgers, fraud detection, or transaction-processing systems.

• Hands-on experience with PCI compliance and a good understanding of PCI-DSS requirements.

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.

• Comfortable working within a large, non-microservices codebase that spans multiple repositories.

• Capable of tracing and reasoning about data across disparate systems.

• Ability to independently make backend architecture decisions, including defining service boundaries, data modeling, and system-design trade-offs.

• Experience with third-party payment processor integrations, including the management of two integration versions concurrently.

• Strong foundations in backend engineering, particularly with a .NET / SQL Server stack, or the capability to quickly adapt to one.

• Proficient in relational database design and operations with SQL Server, encompassing schema design, query performance optimization, and locking behavior at production scale.

• Familiarity with running and debugging production services in a cloud environment; Azure is preferred.

• Expertise in at least one programming language, ideally .NET, Java, or Python.

• Experience with at least one observability platform, such as Datadog, New Relic, or Honeycomb.

• Extensive experience with automated testing frameworks.

• Proficient with Claude Code, Codex, or similar AI-assisted development tools.

• Preferred qualifications include experience with .NET or Java, significant Azure experience, knowledge of payment operations systems, consolidating or migrating parallel system versions, and a background in payments or fintech.

• Permanent residency in the United States is required to secure and maintain employment with Finalsite.

🏝️ Benefits

• Competitive benefits package.

• Opportunities for professional development.

• Collaborative culture focused on partnership and purpose.

• 100% fully remote employment opportunity.