Senior Backend Engineer — Web App & DevEx (Remote, Flexible)

Runware; United States; Remote; USD 150,000 - 190,000; Full time

Benefits offered by this job

Generous PTO

Stock options

Remote-first setup

Flexible hours

Family leave

Company retreats

Job summary

Runware in the United States is seeking a Senior Software Engineer to build and evolve the systems and APIs powering the Web App and DevEx. You’ll own backend work from requirements through delivery, collaborating with backend/frontend, product and design to ship reliable, developer-facing APIs and functionality that simplify complex AI infrastructure.

You’ll work autonomously, contribute to technical decisions, and help turn ambitious ideas into robust production systems while upholding

Qualifications

• Strong experience building backend systems and APIs.
• Strong programming experience in one or more backend languages.
• Experience building reliable, maintainable and well-tested production systems.
• Good understanding of API design, asynchronous workloads and distributed systems concepts.
• Strong engineering fundamentals around security, reliability and performance.
• Strong ownership and autonomy, with good judgement about when to involve others.
• Comfortable using AI-assisted development tools and agents to improve productivity, while maintaining responsibility for the quality, security and correctness of the resulting code.
• Experience with PHP, Symfony and/or Doctrine.
• Experience with WebSockets.
• Experience building public APIs or other developer-facing products.
• Experience with usage-based billing, credits or financial data.
• Experience contributing to architectural decisions and mentoring other engineers.

Responsibilities

• Build and maintain internal and developer-facing APIs and services that power the Web App and developer experience
• Develop and evolve public API functionality, including task types, validation, routing and WebSocket/REST behaviour
• Own and maintain the Admin API and panel as an internal platform used across Runware
• Work with usage, billing and customer data to ensure accuracy and reliability, including Stripe
• Investigate and resolve production issues and security vulnerabilities affecting the Web App and its APIs
• Write, test and review clean, maintainable code, contributing to strong engineering practices and code quality
• Work with Product, Design and engineering teams to clarify requirements, identify dependencies and define well-scoped technical solutions
• Contribute to technical decisions, work across frontend and backend boundaries where appropriate, and collaborate with the wider Backend team where specialist knowledge or shared systems are involved

Skills

Backend development

API design

Distributed systems

Security

Reliability & performance

Communication

Autonomy & ownership

Tools

PHP

Symfony

Doctrine

WebSockets

Job description

Runware in the United States is seeking a Senior Software Engineer to build and evolve the systems and APIs powering the Web App and DevEx. You’ll own backend work from requirements through delivery, collaborating with backend/frontend, product and design to ship reliable, developer-facing APIs and functionality that simplify complex AI infrastructure.

You’ll work autonomously, contribute to technical decisions, and help turn ambitious ideas into robust production systems while upholding