Senior Software Engineer, Ledgering

Responsibilities

• Design, build, and operate the balance and transaction systems of record that serve as the financial source of truth for millions of merchants and customers.
• Build settlement orchestration that determines how account holders get paid: schedules, amounts, deposit methods, and withholdings.
• Develop self-serve ledgering APIs with durable semantics and clear contracts, so partner teams can stand up a new balance or transaction type in about a day instead of waiting weeks on custom integration work.
• Emit balance and settlement data that downstream finance, reconciliation, and reporting teams can trust, against agreed data contracts.
• Design and implement reliable, high-volume distributed transaction-processing systems, making thoughtful tradeoffs between consistency and availability when both are not possible.
• Drive convergence across a large portfolio of financial services: consistent transaction and balance models, shared workflow tooling, and predictable integration patterns.
• Operate tier-0 and tier-1 financial systems against published SLOs, and debug production issues across services and multiple levels of the stack in a high-reliability environment.
• Work AI-natively: use AI agents throughout the development lifecycle, and build agents and automation that reduce operational toil across our services.
• Lead complex projects end to end, breaking the work into components and milestones that other engineers can pick up.
• Mentor other engineers and contribute to the technical direction of the team.
• Work with engineers, product managers, and finance and treasury stakeholders across the company to ship new capabilities at scale.

Requirements

• A minimum of 8 years of related experience with a Bachelor's degree; or 6 years and a Master's degree; or a PhD with 3 years experience; or equivalent experience.
• Experience designing and operating distributed, high-throughput, fault-tolerant services, with a strong understanding of consistency, idempotency, and failure handling.
• Experience building money-movement systems such as ledgers, double-entry accounting, settlement, or treasury, or the curiosity and drive to build deep expertise in the domain.
• Proficiency in at least one major programming language (for example Java, Kotlin, or Go) and strong SQL.
• Experience leading complex, ambiguous projects across multiple engineering teams and driving clear next steps in areas without clear ownership.
• High standards for software architecture and engineering practices, including maintainable and testable code, CI/CD, and observability, in a complex, high-stakes financial environment.
• Proficiency in using AI tools throughout the software development lifecycle to improve engineering productivity, problem solving, and software delivery.
• Strong written and verbal communication skills.

Nice-to-Haves

• Technologies We Use and Teach: Java, Kotlin, Python, AI agents and tooling across the development lifecycle (including AMP, Codex, Claude, Goose and MCP), Temporal, Protocol Buffers, jOOQ, GraphQL, MySQL, Aurora, Vitess, Databricks, Snowflake, AWS, Kubernetes, Terraform, Datadog.