AI Engineer, StackOne

£70-110k

Offers participation in the company’s employee share options plan

React

AWS

TypeScript

Node.js

Sentry

RDS

Postman

JIRA

Slack

Rails

Notion

Svelte

Datadog

Mid and Senior level

London

1+ day a week in office

Integration infrastructure for AI agents

Job no longer available

Integration infrastructure for AI agents

21-100 employees

B2BArtificial IntelligenceDeep TechSaaSAPIData Integration

Job no longer available

£70-110k

Offers participation in the company’s employee share options plan

React

AWS

TypeScript

Node.js

Sentry

RDS

Postman

JIRA

Slack

Rails

Notion

Svelte

Datadog

Mid and Senior level

London

1+ day a week in office

21-100 employees

B2BArtificial IntelligenceDeep TechSaaSAPIData Integration

Company mission

To build the integration infrastructure that lets AI agents act — securely, reliably, across any system.

Job

Company

Role

Who you are

Bachelor's degree in Computer Science, Engineering, or a related field (or 3+ years of relevant experience)
Familiarity with API development, integration, and SaaS platforms
Past experience with AI, specifically Large Language Models and related technologies
Excellent problem-solving and analytical skills
Strong communication and collaboration abilities
Desire to work in a fast-paced, dynamic startup environment

Desirable

You’re familiar with Typescript
You’ve deployed or managed infrastructure on AWS

What the job involves

We are looking for a Software Engineer or Data/AI Scientist with a strong background in AI production-grade applications with strong experience with LLM models (eg: GPT, Anthropic and others)
In this role, you will conduct research and development around AI, focusing on automating processes and development at StackOne
We're building a world where users of any SaaS can integrate with the tool of their choice in one click thanks to StackOne
We're convinced AI is pivotal to making this a reality by transforming how SaaS talks to each other and this is what you will help achieve
Research, design, and develop AI models using or training existing or bespoke LLM models (and other AI tech) to improve and automate API & more generally SaaS interactions
Managing and updating Data pipelines used for AI use-cases
Collaborate with cross-functional teams to identify opportunities for AI integration and automation
Optimize and refine existing AI models and applications for performance and scalability
Stay current with advancements in AI and LLM technologies, applying new knowledge to StackOne's AI strategy
Implement best practices in AI development, ensuring compliance with data privacy and security regulations
Document and communicate research findings and development progress to stakeholders
Collaborate with other software & AI engineer(s) to deliver larger scale projects

Salary benchmarks

Our take

The explosion of SaaS tools has created an integration nightmare for companies. More and more B2B customers are expecting their SaaS tools to integrate with each other natively. But building and managing API connections in-house as a software vendor is time-consuming and costly, diverting teams from their core roadmap and stopping sales teams from selling.

As the next-generation integration platform, StackOne is solving the challenge of building SaaS integrations at scale once and for all. Founded in 2023 by ex-Google and Oracle executives, StackOne has seen exceptionally fast growth since its launch. With its best-in-class security and real-time architecture, the company is well-positioned to become a category leader in the API integration solutions market.

Steph

Company Specialist at Welcome to the Jungle

Company

Funding (last 2 of 3 rounds)

Apr 2025

$20m

Series A

Nov 2023

$3.6m

Seed

Total funding: $23.9m

Company benefits

Meaningful share options (EMI) - share in the company's success as we grow
25 days holiday + 1 additional day per year of tenure
Hybrid working friendly - typically 2 days/week in our London office. We’re open to discussing flexible arrangements—please share any preferences in your application
Private health insurance - including dental & optical
£15/day lunch budget when working from our London office, up to £120/month
£1,000 for your home office set up + £500/year top-up
Health, fitness and gift card discounts
Cycle2Work and Electric Car Scheme
Monthly in-person socials
Annual team offsite to sunny spots (last ones were in Spain and Portugal!)

Company HQ

Central London

Articles

StackOne Secures $3.6M in Seed Funding led by Episode 1

Ex-Google & Oracle execs raise £2.8m seed funding for startup

Leadership

Romain Sestier

(Co-Founder & CEO)

Previously worked for Google as co-founder and Product Lead of Area120, VP of Product and Sales at Yieldify, co-founder and CEO of Upper.ai and Head of UK Professional Services at ContentSquare.

Guillaume Lebedel

(Co-Founder & CTO)

Previously VP of Engineering at Yieldify until its acquisition by Epsilon/Publicis. Also co-founded another start-up and worked at Maxymiser (acq. by Oracle) as a developer.

Diversity, Equity & Inclusion at StackOne

Yasmin Chalmers (Head of People)

Women @ StackOne community

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