Senior Software Engineer - Web App & DevEx

We’re looking for a Senior Software Engineer to help build and evolve the systems and APIs that power Runware’s Web App and Developer Experience (DevEx).

You’ll work closely with backend engineers, frontend engineers, Product, Design and other teams to build reliable internal and developer-facing APIs and functionality that make complex AI infrastructure simple to use.

You’ll take ownership of backend work from understanding requirements and technical constraints through to implementation and delivery, contributing to the quality, reliability and evolution of the Web App and its supporting APIs.

This role combines technical depth with product thinking and collaboration. You’ll be expected to work autonomously, contribute to technical decisions and help turn ambitious ideas into robust production systems.

What you’ll do
- 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