AI role · Open offer

Senior AI Developer — SMB accounting AI

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Sage

Full-time
Senior
Copilot engineering
Hybrid
North Park, Newcastle upon Tyne, England NE13 9AA, United Kingdom · Hybrid
Newcastle, United Kingdom
£75k–100k/year + bonus

This listing is optimized for AI-native talent: clear skills and tools so candidates know if they fit before they apply—and so you spend less time screening mismatches.

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At a glance

How you'll work, where, and key listing dates.

Employment: Full-time
Workplace: Hybrid
Location: North Park, Newcastle upon Tyne, England NE13 9AA, United Kingdom · Hybrid
Compensation: £75k–100k/year + bonus
Experience level: Senior
Team: Copilot engineering
Benefits & perks

About this role

What the team is looking for and how this position fits.

Sage is hiring a Senior Senior AI Developer — SMB accounting AI on the Copilot engineering team (Hybrid · Newcastle, United Kingdom). This is a hands-on role in LLM & generative AI—not a generic “AI enthusiast” post.

You will own LLM features, retrieval, agents, and evaluation end to end: problem framing, offline evaluation, safe rollout, and iteration from production signals. Success is measured with clear metrics (quality, latency, cost, or business KPIs)—not slide decks alone.

Sage serves millions of SMB accountants with cloud software. Senior AI Developer builds copilots for bookkeeping, tax Q&A, and document capture.

Hybrid Newcastle: bilingual UK customer base; accuracy and citations matter.

What you will do

Implement RAG over accounting knowledge with tenant isolation.
Partner with PM on eval sets for tax-season peaks.
Optimise inference cost for high-volume SMB tenants.

Stack & environment

Python, LangChain, OpenAI APIs, Docker.
Hybrid Newcastle North Park.

What we look for

4+ years backend/ML; ERP or fintech a plus.

Skills we're hiring for

What each capability means for this role—not a keyword checklist.

Python
Production Python for data pipelines, model code, APIs, and automated tests—not notebook-only workflows.
LangChain
Orchestrating LLM chains, tools, and retrieval with observable steps and failure handling.
OpenAI API

Tools & stack

Platforms and products mentioned for this role (APIs, IDEs, vector DBs, CRMs, design tools, etc.).

DockerTool
Containerized services and reproducible dev environments for ML and LLM workloads.

You're a strong fit if…

Tailored to this listing—use it as a self-check before you apply.

You can show evidence in your application: RAG assistant for accountants with eval harness and guardrails.
Several of these show up in recent shipped work—not only on your CV: Python, LangChain, OpenAI API, SQL, and Docker.
You have owned LLM features, retrieval, agents, and evaluation in production: debugging live issues, running postmortems, and iterating from real user or business signals.
You are comfortable with the hybrid rhythm (Hybrid · Newcastle, United Kingdom)—onsite collaboration when it matters, deep work when remote.
You explain trade-offs (quality, cost, latency, safety) in plain language—with numbers or examples, not buzzwords.

Apply

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What the employer asked for

RAG assistant for accountants with eval harness and guardrails.

Register, add a headline and bio, then you can attach a CV link or PDF on My account before you apply. That keeps applications tied to your profile and makes it easier for employers to review your background.

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