Software Engineer, Agent (French speaking)

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; we 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 across technical and non-technical audiences
• Professional fluency in both French and English
• Experience building or deploying AI/LLM systems in production is a plus
• Founder or founding engineer experience is a plus
• Familiarity with 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 where we interfaced with customers or led technical projects with external stakeholders is a plus

Responsibilities:

• 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
• Own the Agent Development Life Cycle from initial pilot through deployment and continuous iteration
• Build, tune, and evolve AI agents in production environments
• Work directly with leaders at large enterprises to understand business challenges and build AI agents that transform how they operate at scale
• Partner with cutting-edge startups in London and embed AI agents across their business stack to drive innovation and efficiency
• Use customer work to guide the evolution of our core platform
• Surface unmet needs, prototype new tools and features, and collaborate with research, product, and platform teams to shape the future of AI agent development
• Design and build AI agents for large telecommunications and media companies
• 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 such as new agent architectures, self-service capabilities, and generative agent development
• Experiment with the latest voice models and integrate them at scale for enterprise-grade customers

Technologies:

• AI
• AI Agents
• LLM
• RAG
• React
• TypeScript
• CTO
• Support
• Salesforce
• VR

More:

hackajob is partnering directly with Sierra to hire for this role. We are 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, and they guide our culture and work. Our co-founders are Bret Taylor and Clay Bavor. We offer flexible unlimited paid time off, medical, dental, and vision benefits for you and your family, life insurance and disability benefits, a retirement plan dependent on country of employment, parental leave, fertility and family building benefits through Carrot, lunch, snacks and coffee, a discretionary benefit stipend, free alphorn lessons, and equity plans for eligible full-time employees. We are committed to diversity, encourage candidates to apply even if their experience does not precisely match the job description, and evaluate applicants consistently without regard to protected characteristics.

last updated 34 week of 2026