
Hackajob Ltd
Software Engineer, Agent (German speaking)
Job Description
Salary: £100,000 - 100,000 per year
Requirements:- Experience building and scaling end-to-end production systems
- Strong technical problem-solving skills, especially in fast-changing, ambiguous environments
- A builder and tinkerer mindset with high agency and the ability to overcome obstacles and ship
- Comfort working directly with customers to understand their needs and solve real-world problems
- Excellent communication skills, with the ability to be clear, direct, and persuasive across technical and non-technical audiences
- Professional fluency in both German and English
- Experience building or deploying AI/LLM systems in production is a plus
- Founder or founding engineer experience is a plus
- Familiarity with tools that power todays AI agents, such as eval frameworks, agent tooling, RAG pipelines, and prompt engineering is a plus
- Prior experience with React, TypeScript, and/or Go is a plus
- Previous roles interfacing with customers or leading technical projects with external stakeholders is a plus
- Design and deliver production-grade AI agents that are highly performant, reliable, and intuitive
- Build and ship AI agents that run in production across industries such as finance, healthcare, and commerce
- Drive the Agent Development Life Cycle from initial pilot through deployment and continuous iteration
- Build, tune, and evolve AI agents in production environments
- Partner directly with leaders at large enterprises to understand business challenges and build AI agents that transform how they operate at scale
- Work with cutting-edge startups in London to embed AI agents across their business stack
- Surface unmet needs from customer work and prototype new tools and features
- Collaborate with research, product, and platform teams to shape the future of AI agent development and our product
- Design and build AI agents for large telecommunications and media companies to improve subscription churn management
- Develop and refine AI agents for complex customer interactions, including troubleshooting and personalized recommendations
- Create generalizable AI agent frameworks tailored for industry-specific use cases
- Facilitate design partnerships for new product initiatives, including agent architectures, self-service capabilities, and generative agent development
- Experiment with the latest voice models and integrate them at scale for enterprise-grade customers
- AI
- AI Agents
- Support
- LLM
- RAG
- React
- TypeScript
- CTO
- Salesforce
- VR
More:
We are Sierra, a platform built to help businesses create 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 culture is guided by Trust, Customer Obsession, Craftsmanship, Intensity, and Family. Our co-founders are Bret Taylor and Clay Bavor, and we offer a range of benefits for full-time employees including flexible unlimited paid time off, medical, dental, and vision coverage, life insurance and disability benefits, a retirement plan dependent on country of employment, parental leave, fertility and family building support through Carrot, lunch, snacks and coffee, a discretionary benefit stipend, free alphorn lessons, and equity plan participation for eligible full-time employees subject to plan terms.
last updated 34 week of 2026
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About Hackajob Ltd

Hackajob Ltd
Charing Cross
IT
Skills & Technologies
Inferred from job description
Salary Insight
£100,000
This role
£60,000
UK median
This salary is 67% above the UK median for Software Engineers (£60,000/yr).
Based on 2024–2025 UK technology sector benchmarks