AI Engineer, StackOne
1+ day a week in office
Integration infrastructure for AI agents
Open for applications
Integration infrastructure for AI agents
21-100 employees
Open for applications
1+ day a week in office
21-100 employees
Company mission
To build the integration infrastructure that lets AI agents act — securely, reliably, across any system.
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
- You will have a lot of freedom and agency to chose and work with the technologies you love. Our tech stack includes:
- Infra & monitoring: AWS (ECS, RDS, Elasticache, Lambda etc.), Tinybird, Modal, Dagster, Langsmith, Datadog, Sentry, Incident.io
- Languages & Frameworks: Typescript (Node.js), NestJS, Rails, React, Svelte,
- Other day-to-day Tools: Postman, Notion, Slack, Jira, Github and more
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
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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