Senior Platform Engineer — API, Integrations & Infra

Numeral; San Francisco (CA); On-site; USD 170,000 - 250,000; Full time

Job summary

Numeral in San Francisco is seeking a Senior Software Engineer, Platform to build services, infrastructure, and developer interfaces that power our tax automation platform. Our platform team works across infrastructure, our public API, our MCP server, and integrations with billing platforms and ERPs.

You'll help make our systems more reliable and scalable while building new ways for customers and partners to connect with Numeral. This is a hands-on role with meaningful ownership.

Qualifications

• 5+ years of experience building and operating backend software or platform systems in production.
• Experience building APIs, integrations, or data pipelines, with attention to correctness, error handling, and maintainability.
• Practical experience with AWS or another cloud platform and containerized workloads using ECS, Kubernetes, or similar tools.
• An understanding of distributed systems fundamentals, including retries, idempotency, queues, and failure recovery.
• Experience using logs, metrics, and tracing to debug production issues and improve system reliability.

Responsibilities

• Build and evolve our public API and MCP server, making it easy for customers, developers, and AI tools to work with Numeral.
• Build integrations with billing platforms and ERPs, handling data synchronization, workflow automation, and the real-world complexity of financial data.
• Improve the infrastructure behind our platform, supporting reliable APIs, background jobs, and data pipelines as transaction volumes grow.
• Own projects end to end, including technical design, implementation, rollout, and ongoing operation.
• Improve observability, performance, and incident response so we can identify problems quickly and prevent repeat issues.
• Automate infrastructure and deployment workflows through infrastructure-as-code, CI/CD, and container tooling.
• Partner with product and engineering teams to ship new capabilities while keeping our systems dependable and maintainable.

Skills

Backend engineering

APIs & data pipelines

Distributed systems fundamentals

Observability & debugging

Ownership & customer focus

Education

Bachelor's degree in CS or related field

Tools

Node.js

PostgreSQL

Redis

AWS

ECS

Kubernetes

CI/CD tooling

Job description

Numeral in San Francisco is seeking a Senior Software Engineer, Platform to build services, infrastructure, and developer interfaces that power our tax automation platform. Our platform team works across infrastructure, our public API, our MCP server, and integrations with billing platforms and ERPs.

You'll help make our systems more reliable and scalable while building new ways for customers and partners to connect with Numeral. This is a hands-on role with meaningful ownership.