(Senior) Software Engineer (all genders)

You'll own the integration backbone of our client projects: the RESTful APIs, webhooks, and middleware that connect HubSpot, ERP systems, data warehouses, and the long tail of third-party platforms our clients run.

Today this work is squeezed between Senior and Principal engineers who are committed to delivery and AI initiatives. You free that bottleneck. You'll ship production code, write the OpenAPI specs that go with it, build a reusable integration pattern library, and advise client teams on integration architecture decisions. The bar is zero critical integration failures in your first 12 months.

• You'll independently deliver at least 2 client integration projects (API, middleware, webhook scope) end-to-end with no critical escalations within your first 6 months
• You'll produce complete OpenAPI/Swagger documentation for every integration you deliver, reviewed and signed off by the Director D&T
• You'll establish a reusable integration pattern library in Confluence (minimum 5 patterns) that other D&T team members can reference
• You'll advise at least 3 internal project teams or client stakeholders on integration architecture decisions, with documented recommendations
• You'll reach full fluency in our dev workflow (Git branching model, CI/CD pipelines, Jira issue lifecycle) within your first 30 days
• You'll keep production incidents at zero for the integrations you build, with all incidents resolved within SLA
• You'll complete peer code review on at least 80% of team PRs within the agreed SLA

• 2 to 4 years of professional software engineering experience, with hands-on integration work as a meaningful part of the role
• Productive in at least one of Node.js, Python, .NET, or Java, with the ability to read and debug code in a second language
• Direct experience designing RESTful APIs and selecting integration patterns (webhook, polling, event-driven, middleware), with concrete examples of trade-offs you've made
• Treats OpenAPI/Swagger documentation as part of delivery, not as an afterthought
• Has shipped to production via CI/CD pipelines (not local builds or manual deployment)
• Comfortable translating technical integration constraints into plain language for non-technical PMs or client contacts
• Pattern of problem ownership: investigates, proposes, flags with context, rather than escalating "I'm stuck"
• Willing and able to work on-site in Böblingen at minimum 2 days per week

You'll join the Development Team within our Development & Technology Practice. You'll report directly to the Director Development & Technology, since the Team Lead Development seat is currently TBD. Day-to-day, you'll work alongside Senior and Principal engineers on the same Practice, the AI team for agentic and LLM-driven integrations, the Tech Consulting team for architecture handoffs, and PMs from the PMO Practice on delivery.

A cover letter is optional, but a concrete example of the most complex API integration you've personally built end-to-end (the system landscape, the integration pattern you chose, what broke, and how you fixed it) is required.