Senior Product Engineer, Treasury (Elixir)

Team: Product

Location: US

Commitment: Full-time

Workplace Type: remote

Accountabilities:

As a Senior Product Engineer, you will take ownership of critical treasury product capabilities, building reliable backend services and complete user-facing features. You will contribute to technical strategy, establish strong engineering practices, and help deliver resilient systems that support increasingly sophisticated financial workflows.

• Design, build, deploy, and operate Elixir and Phoenix services, including APIs, data pipelines, and asynchronous processing systems.

• Own product features throughout the entire software development lifecycle, from problem discovery and requirements definition to backend implementation, frontend delivery, and production operations.

• Develop and scale core treasury services that support high-volume financial transactions and emerging AI-driven spending workflows.

• Build and improve infrastructure that enables AI agents to initiate corporate expenses and travel, as well as create and use payment cards.

• Prioritize reliability across critical Tier 0 and Tier 1 systems through robust observability, monitoring, and operational practices.

• Collaborate directly with company founders and senior colleagues across treasury, product, engineering, and data/AI to shape product direction and technical decisions.

• Use AI-assisted development tools, particularly Claude Code, to improve engineering productivity and support high-quality implementation.

• Help establish and refine architectural standards, engineering workflows, development practices, and code review processes.

• Contribute to a collaborative engineering culture focused on end-to-end ownership, maintainability, and dependable production systems.

Requirements:

The ideal candidate is an experienced product-minded engineer with strong production experience in Elixir and Phoenix, a solid understanding of distributed systems, and the ability to deliver complete features independently. You should combine technical depth with clear communication, sound product judgment, and practical experience using AI-assisted development tools.

• Be based in the United States and able to work Eastern Time hours in close collaboration with the treasury team.

• Have at least 5 years of professional software engineering experience.

• Demonstrate strong hands-on experience developing and operating production applications with Elixir and Phoenix.

• Be comfortable owning features end-to-end, from product framing and requirements through backend services, frontend implementation, and production support.

• Have a solid understanding of distributed systems, concurrency, and asynchronous processing.

• Possess strong PostgreSQL skills and practical experience with cloud infrastructure, Kubernetes, and CI/CD pipelines.

• Demonstrate fluent, day-to-day use of AI coding tools, particularly Claude Code, in real software development workflows.

• Communicate clearly with both technical and non-technical stakeholders.

• Have fluent English communication skills.

Nice-to-have qualifications:

• Experience with Python or other backend programming languages.

• Background in payments, treasury, fintech, or related financial technology domains.

• Familiarity with event-driven architectures, message queues, and workflow orchestration.

• Exposure to AI- or machine learning-powered products.

Benefits:

• Competitive compensation: Salary package designed to reflect experience and expertise.

• Meaningful equity: Opportunity to participate in the company's growth and success.

• AI tooling budget: Extensive resources for AI-assisted development and engineering productivity.

• Generous paid time off: Support for rest, personal commitments, and work-life balance.

• Remote-first flexibility: Fully remote work with a flexible schedule, aligned with Eastern Time collaboration.

• Health and wellness: Comprehensive health coverage and wellness benefits.

• Autonomy and ownership: Direct influence over product direction, architecture, and engineering decisions.

• Innovative technical environment: Opportunity to build advanced payment and treasury infrastructure, including AI-driven financial workflows.

• Inclusive culture: A commitment to diversity of thought, culture, and background, with equal employment opportunities.