Lumina Tech Group
Staff Software Engineer
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Staff Software Engineer (AI Products) | London | £150,000–£250,000 + Equity
Location
London (5 days onsite)
Salary
£150,000–£250,000 + Competitive Equity
About the Company
Our client is an early-stage, venture-backed AI startup building next-generation AI-powered products that are transforming how businesses interact with their customers. Following recent funding, they're looking to hire an exceptional Staff Software Engineer to play a key role in building and scaling their AI platform. This is an opportunity to join at an early stage, work on cutting-edge AI technology and have significant ownership over product and technical direction.
The Opportunity
We're looking for an experienced software engineer with a strong backend focus who enjoys building products from the ground up. You'll be responsible for designing, developing and shipping production AI products, working across the full stack and partnering directly with customers to solve real-world problems. This role suits someone who thrives in fast-moving startup environments and enjoys taking ownership from idea through to production.
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Responsibilities
- Design, build and ship production AI products end-to-end
- Develop scalable backend services using Python
- Build intelligent AI agents and LLM-powered applications
- Work across the full stack using Python and TypeScript
- Build event-driven distributed systems
- Develop cloud-native applications using Kubernetes and serverless technologies
- Integrate with third-party APIs and CRM platforms
- Work directly with customers to understand requirements and deliver technical solutions
- Help shape engineering best practices and technical architecture
About You
You'll likely have:
- 5–10 years of commercial software engineering experience
- Strong backend engineering expertise
- Excellent Python development skills
- Commercial TypeScript experience
- Experience building and shipping production AI products
- Hands-on experience with AI agents or LLM applications
- Experience working within Seed or Series A startups
- Strong cloud infrastructure knowledge
- Experience with Kubernetes and distributed systems
- A customer-first mindset and experience working directly with end users
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Technical Skills
Essential
- Python
- TypeScript
- Async Python (asyncio)
- FastAPI
- AsyncOpenAI
- httpx
- Kubernetes
- Cloud infrastructure
- Serverless architecture
- Event-driven systems
- AI Agents
- LLM integrations
Desirable
- LangGraph
- LangChain
- Voice AI platforms
- CRM integrations
- Twilio
- ElevenLabs
- Vapi
- Retell AI
- Redis
- Kafka
- RabbitMQ
What We're Looking For
You'll be someone who:
- Loves building products from scratch
- Enjoys solving difficult engineering problems
- Has a startup mindset
- Can balance speed with quality
- Takes ownership
- Communicates confidently with both technical and non-technical stakeholders
This Role May Not Be Right If
- Your background is primarily Machine Learning research or Data Science
- Most of your career has been spent in large enterprise organisations
- You prefer highly structured environments over fast-paced startups
- You haven't built production AI applications
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