Software Engineer, Agent (German speaking)

Company: hackajob
Apply for the Software Engineer, Agent (German speaking)
Location: London
Job Description:

About Sierra

At Sierra, we’re creating a platform to help businesses build better, more human customer experiences with AI. We are primarily an in-person company based in San Francisco, with growing offices in Atlanta, New York, London, Paris, Madrid, Munich, Singapore, Japan, and Sydney.

Our values are Trust, Customer Obsession, Craftsmanship, Intensity, and Family. These values guide our actions and culture and inform how we work together.

Our co-founders are Bret Taylor and Clay Bavor. Bret currently serves as Board Chair of OpenAI. Previously, he was co-CEO of Salesforce (which had acquired the company he founded, Quip) and CTO of Facebook. Bret was also one of Google’s earliest product managers and co-creator of Google Maps. Before founding Sierra, Clay spent 18 years at Google, where he led Google Labs and previously led Google’s AR/VR efforts, including Project Starline and Google Lens. Before that, Clay led the product and design teams for Google Workspace.

What You’ll Do

  • Design and deliver production-grade AI agents: build and ship highly performant, reliable, and intuitive AI agents that are central to Sierra’s growth. These are scalable systems running in production across industries like finance, healthcare, and commerce.
  • Drive the Agent Development Life Cycle (ADLC): own the process from pilot through deployment and continuous iteration. Build, tune, and evolve AI agents in production, defining ADLC best practices.
  • Partner with large enterprises and cutting-edge startups: work with leaders at major enterprises to understand business challenges and build AI agents that operate at scale, and embed AI agents across startups’ stacks to drive innovation and efficiency.
  • Build the future of the platform: collaborate with customers to guide Sierra’s core platform, surface unmet needs, prototype tools and features, and shape the future of AI agent development.

Example projects

  • Design and build AI agents for large telecommunications and media companies that outperform human agents in managing subscription churn
  • Develop AI agents capable of navigating complex customer interactions, such as troubleshooting devices and personalizing product recommendations
  • Create generalizable AI agent frameworks tailored for industry-specific use cases
  • Facilitate design partnerships for new product initiatives, including new agent architectures and self-service capabilities
  • Experiment with latest voice models and explore integration at scale for enterprise-grade customers

What You’ll Bring

  • Experience building and scaling end-to-end production systems
  • Strong technical problem-solving skills in fast-changing, ambiguous environments
  • A builder and tinkerer’s mindset with high agency; you find creative ways to overcome obstacles and ship
  • Comfort working directly with customers to understand their needs and solve real-world problems
  • Excellent communication skills—clear, direct, and persuasive across technical and non-technical audiences. Professional fluency in both German and English.

Even better…

  • Experience building or deploying AI/LLM systems in production
  • Have been a founder or founding engineer; you know what it means to balance craft, ownership, and speed
  • Familiarity with tools that power today’s AI agents: eval frameworks, agent tooling, RAG pipelines, and prompt engineering
  • Prior experience with React, TypeScript, and/or Go
  • Previous roles where you interfaced with customers or led technical projects with external stakeholders

Our values

  • Trust: We build trust with customers through accountability, empathy, quality, and responsiveness, and we strive to make AI accessible, safe, and useful.
  • Customer Obsession: We deeply understand customers’ business goals and focus on driving outcomes, not just technical milestones.
  • Craftsmanship: We get the details right, from words to system architecture, and continuously self-improve.
  • Intensity: We strive to make our product the best and address issues openly to improve next time.
  • Family: We balance intensity with support and respect for each other and celebrate personal and professional achievements.

What We Offer

  • Flexible (unlimited) paid time off
  • Medical, dental, and vision benefits for you and your family
  • Life insurance and disability benefits
  • Retirement plan dependent on country of employment
  • Parental leave
  • Fertility and family-building benefits through Carrot
  • Lunch, snacks, and coffee
  • Discretionary benefit stipend
  • Free alphorn lessons

These benefits are detailed in Sierra’s policies, may vary by region, and are subject to change. Eligible full-time employees may participate in Sierra’s equity plans subject to plan terms.

Be you, with us We’re working to bring the transformative power of AI to every organization in the world. We value diversity and encourage applications from all backgrounds. We strive to evaluate all applicants consistently without regard to race, color, religion, gender, national origin, age, disability, veteran status, pregnancy, gender expression or identity, sexual orientation, citizenship, or any other legally protected class.

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Posted: July 9th, 2026