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NEXTMOVEFDE careers · United States
DeepL

Senior Software Engineer | API

AI summary of the role

Senior Software Engineer on the API Core team at DeepL, responsible for building and scaling the developer-facing API platform.

What you’ll do

  • Own and transform the developer experience for DeepL APIs, building self-service onboarding flows and customization interfaces
  • Create reusable components, documentation, starter templates, and client libraries (SDKs) for customers and ISVs
  • Act as API standard-bearer across teams, ensuring consistency, security, and reliability of all customer-facing APIs
  • Implement automated quality gates, contract testing, and monitoring to prevent breaking changes and vulnerabilities

What you’ll bring

  • Deep expertise in designing scalable backend systems, RESTful APIs, and distributed architectures (Go, Python, Java, C#, or similar)
  • Comfortable crossing the stack with modern frontend frameworks (React/TypeScript) for developer-facing UIs
  • Track record of owning services end-to-end, including production operations, incident response, and SLOs
  • Product-first API mindset with focus on reducing cognitive load and providing stellar documentation

Technologies

Go · Python · Java · C# · React · TypeScript · RESTful APIs · SDKs · GitHub Copilot · Claude

About DeepL

Neural machine translation and AI writing tools (DeepL Translator, Write, API) sold via consumer subscriptions and enterprise/API contracts.

Series C · 1000–5000 people

Source and classification

Deployment team leadership · Evidence for this classification:

are building the Operating System for Global Communication. We are the rare AI company that builds the entire stack in-house: from training next-gen LLMs on our own NVIDIA DGX SuperPODs to delivering real-time Language AI to over 300 million users and 200,000+ businesses globally. You will join the API Core team. For us, the API is the product. We are the bridge connecting DeepL's bleeding-edge AI capabilities to developers worldwide. We focus on Developer Experience (DevEx), API platform infrastructure, and enabling our internal product teams to launch world-class APIs quickly and independently. We are shifting gears from "Software-First" to "Product-First." We don't hire engineers to simply maintain legacy endpoints or close Jira tickets. We hire Missionaries—builders who obsess over the Why before the How . You will balance strategic platform architecture with tactical feature
How jobs are selected

Employer postings · Data from · Sources