Senior Backend Engineer Payments Infrastructure

Location: San Francisco CA / New York NY
Company Stage of Funding: Series C AI Infrastructure Company ($10B Valuation)
Office Type: Onsite (5 Days Per Week)
Salary: $130000$400000 Equity

Company Description

Were representing one of the fastest-growing companies in the AI ecosystem building the human intelligence infrastructure powering frontier AI models. Their platform connects leading AI labs and enterprises with a global network of experts who help train evaluate and improve next-generation AI systems.

As the company scales rapidly its payments platform has evolved from processing hundreds of thousands of dollars to hundreds of millions in transaction volume. To support continued growth they are investing heavily in building resilient observable and highly automated financial infrastructure that serves as the backbone of their global marketplace.

What You Will Do

• Design and build the next generation of the companys payments infrastructure supporting large-scale global financial operations.
• Develop highly reliable backend systems that power payout orchestration settlement processing reconciliation and ledger management.
• Build end-to-end observability across payment workflows to proactively detect failures and improve operational reliability.
• Design immutable auditable ledger systems that ensure financial correctness and long-term scalability.
• Build automation that eliminates manual treasury payout and financial operations workflows.
• Architect scalable settlement ingestion and reconciliation pipelines across multiple payment providers.
• Improve resilience monitoring and fault tolerance across distributed financial systems.
• Integrate with payment processors banking APIs and financial infrastructure providers while maintaining abstraction and portability.
• Partner closely with Engineering Finance Product Operations and Fraud teams to improve financial system reliability.
• Drive long-term architectural improvements by identifying and eliminating root causes rather than implementing short-term fixes.

Ideal Background

• 5 years of professional backend or platform engineering experience.
• Strong experience building production systems within payments fintech billing financial infrastructure or other highly regulated domains.
• Proven expertise developing scalable backend services that prioritize correctness reliability and operational excellence.
• Experience integrating payment gateways such as Stripe Adyen or similar financial service providers.
• Strong understanding of transactional databases including PostgreSQL or MySQL.
• Experience building distributed systems using Go Rust C or similar compiled languages.
• Familiarity with messaging platforms such as Kafka RabbitMQ Amazon SQS or comparable event-driven architectures.
• Experience operating large-scale production systems with strong observability monitoring and incident response practices.
• Strong systems thinking and ability to balance engineering velocity with long-term reliability.

Preferred

• Experience building ledger systems reconciliation engines settlement platforms or treasury infrastructure.
• Familiarity with Kubernetes Temporal workflow orchestration or distributed systems platforms.
• Experience working directly with banking APIs ACH wire transfers or international payment systems.
• Knowledge of PCI-DSS payment security encryption and financial compliance best practices.
• Experience abstracting payment processors and building provider-agnostic financial systems.
• Background at high-growth fintech companies or infrastructure-focused startups.
• Strong ownership mentality with experience designing systems that operate under significant financial and operational scale.
• Interest in AI infrastructure marketplaces and large-scale financial operations.

Compensation and Benefits and Other Things

• Base salary: $130000$400000.
• Generous equity package vested over four years.
• Bi-annual performance bonus structure.
• Up to $15000 relocation assistance.
• $10000 housing bonus for employees living within walking distance of the office.
• $1500 monthly meal stipend.
• Complimentary Equinox membership.
• Monthly wellness and lifestyle reimbursements.
• Comprehensive medical dental and vision coverage.
• Opportunity to build the financial infrastructure supporting one of the fastest-growing AI companies in the world.
• Significant ownership over mission-critical systems that directly impact the companys ability to scale globally.
• Work alongside world-class engineers operators and AI organizations shaping the future of artificial intelligence.