Senior AI Engineer

Dubizzle Limited; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading technology firm in Greater London is seeking a Senior AI Engineer to deliver AI-powered features using OpenAI and LangChain. In this hands-on role, you will design workflows, integrate modern technologies, and improve product quality. Ideal candidates should have 5+ years in full-stack or backend engineering, solid TypeScript skills, and experience with AI-powered products. This position includes benefits like unlimited holiday, private healthcare, and flexible working arrangements.

Benefits

Pensions with 5% employer contribution

Private Healthcare: Vitality

Unlimited holiday

Flexible working

Team socials

Monthly benefits budget

Bonus structure based on performance

Wellness time during work hours

Qualifications

• 5+ years experience as a Full-Stack / Backend Engineer.
• Strong TypeScript and JavaScript fundamentals.
• Hands-on experience with LangChain and/or LangGraph.

Responsibilities

• Own end-to-end delivery of AI-powered features.
• Design and implement agentic workflows using OpenAI.
• Contribute to and improve CI/CD pipelines.

Skills

Full-Stack Engineering

TypeScript

JavaScript

OpenAI API Integration

LangChain

Education

Bachelor's degree in a relevant field

Tools

Supabase

Node.js

React

Job description

Senior AI Engineer (OpenAI,LangChain/LangGraph, TypeScript,Supabase)

AboutBoldspace&BoldStream™

Boldspaceis a6-year-oldfull-serviceBrand& communicationsagencythat hasexperienced year-over-yeargrowth sinceitsfounding.Our seasoned agency-side co-founders felt there was acriticallack of industry transparencyindata and measuring theperformance ofclient work,so welaunchedBoldStreamon day 1, ourflagship data & analytics platform that helps brands measure and act on the impact of their communications in real time.

Wewill now continue to investheavily in AI-native capabilities: agentic workflows, retrieval-augmented insights, and intelligent automation across our client reporting and analytics stack.

Position Overview:

We’relooking for a Senior AI Engineer to own end-to-end delivery of AI-powered features acrossBoldLoopand related internal products.You’llsit at the intersection of OpenAI’s latest agentic tooling,LangChain/LangGraph, TypeScript, andSupabase, building production-grade systems rather than prototypes.

This role is hands-on and full-stack: from designing LLM-powered workflows and data models to shipping polished front-end experiences and observability for everything you release.

AI & Agentic Product Development

• Design and implement agentic workflows using OpenAI (Responses API,AgentKit& Agent Builder) andLangChain/LangGraphfor use cases like analytics copilots, automated reporting, insight generation and internaltools.
• Build and tune prompts,toolsand orchestration logic to make agents reliable: handle tool-calling, multi-step reasoning, fallbacks, and guardrails.
• Architect and implement RAG pipelines (embeddings, vector stores, retrieval strategies, caching) usingSupabaseand other data sources to ground models inBoldLoopand client data.

Full-Stack Engineering

Own full-stack delivery of AI features:

• Backend: TypeScript/Node or edge functions,Supabase(Postgres + vector store), API design, schema design,migrationsand performance tuning.
• Frontend: Modern TypeScriptfront-ends(React / Next.js or similar) for analytics dashboards,workflowsand internal tooling.
• Integrate OpenAI and other LLM providers in a way that is robust, observable, and cost-aware (tracing, token usage monitoring, rate limiting, retries).
• Work closely with data engineers / analysts to exposeBoldLoopmetrics, models and datasets through AI features that feel intuitive to non-technical users.

Engineering Quality & Platform Foundations

• Champion testing,observabilityand reliability for AI features: unit tests, integration tests, synthetic evals for prompts, and health checks for agent workflows
• Contribute to and improve CI/CD pipelines, deployment strategies and cloud infrastructure supporting AI workloads.
• Use GitHub,Linearand AI-enhanced tooling (Cursor, Lovable, etc.) to move quickly whilemaintaininghigh standards.

Collaboration & Leadership

• Translate business and product requirements into technical designs and implementation plans for AI features.
• Provide technical leadership within the AI /BoldLoopsquad, mentoring engineers on LLM patterns, agenticarchitecturesand best practices.

Partner with Product, Data, Client Services and Strategy to define AI roadmaps that unlock measurable value for clients.

Skills & Experience

Essential

• 5+years experienceas a Full-Stack / Backend Engineer, with at least 2+yearsbuilding LLM-powered products in production.
• Strong TypeScript and JavaScript fundamentals; production experience with Node.js backends and modern front-end frameworks.
• Hands-on experience withLangChainand/orLangGraph, ideally including multi-agent or complex tool-using workflows.
• Proven experience integrating OpenAI APIs (chat, Responses,AgentsSDK) into production systems.
• Solid experience withSupabaseor similar (Postgres, auth, edge functions, vector search) and data modelling for analytics and content.
• Deep understanding of RAG, prompt engineering, evaluation, and safety/guardrail patterns for LLM applications.
• Comfortable with CI/CD, cloudinfrastructureand observability for distributed systems.

Nice to have

• Experience withadditionalAI frameworks (CrewAI,LangFlow, semantic search stacks, etc.).
• Exposure to analytics ormartechplatforms, especially where data storytelling and communication impact are key.
• Experience with AI-assisted developer tools (Cursor, Lovable) and low-code platforms whereappropriate.

WhatYou’llBring

• Engineeringrigour–a track recordof shipping reliable systems, instrumenting them well, and improving them over time.
• AI product mindset – you think in terms of user journeys, failuremodesand measurable impact, not just model calls.
• Systems thinking – you understand how agents, tools,dataand UI fit together to deliver value end-to-end.
• Collaboration – clear communication, especially when explaining AI systems to non-technical stakeholders.
• Pensions: a 5% employer contribution.
• Private Healthcare: Vitality
• Holiday: unlimited holiday (including all UK public holidays) – we trust our staff to take the time they need and still excel in their jobs – and days off for birthdays and moving house are guaranteed!
• Very Flexible working
• Socials: team socials regularly, chosen by the team.
• Team retreats: time to get to know each other away from the office.
• Bonus: transparent bonus structure where you can receive a % of base salary based on personal and company performance.
• Supporting good causes: we contribute some of our outperformance to charitable causes which the team help choose.
• Wellness: time within working hours every week for those that want or need it.
• Monthly benefits budget: £50 per month, every month, to spend on whatever you want – from a home delivered vegetable box and discounted gym memberships, to mental health support and professional coaching.

A CARBON NEUTRAL BUSINESS

Boldspace measures its performance on profit, people and planet combined. From day one, we will offset your carbon footprint entirely. The cost of this is covered 100% by the company.