Product Engineer
UK Visa Sponsorship Analytics
Analytics are greyed out due to low classification confidence (39.0%).
Occupation Type
Production and process engineers
Occupation Code Skill LevelHigher Skilled
Sponsorship Salary Threshold
£45,000
(£23.08 per hour)
Occupation rate applies
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Description
About StackOne:
StackOne is the AI Integration Gateway for SaaS products and AI Agents. Backed by GV and Workday Ventures ($24M raised), we help builders of SaaS platforms and AI Agents orchestrate hundreds of scalable, accurate, and enterprise-grade integrations. Our platform combines 25,000 pre-mapped actions on 200 connectors, an AI-powered integration development toolkit, plus security by design: a real-time architecture, managed authentication and permissions, and end-to-end observability.
Join us on our fast trajectory to build the future of agentic integrations.
With an AI-native integration toolkit that delivers real-time execution, managed authentication, granular permissions, and full observability, all built with safety at its core, we’re now doubling down on AI R&D & creating our own lab to push the boundaries of tool calling for agents: training specialized LLMs designed to outperform general-purpose models in what matters most: precision, reliability, and safety in agentic execution.
About The Role
We’re looking for full-stack engineers who can ship fast, think in systems, and obsess over scalability, performance & usability. You’ll build core APIs, scale infra, and ship dev tools & UIs that makes tool execution easy, safe and predictable.
It’s a broad role: backend-heavy, product-aware, and deeply technical. Expect to work across APIs, auth, infra, and frontend, building the foundation that lets agents take real action.
Responsibilities
StackOne is the AI Integration Gateway for SaaS products and AI Agents. Backed by GV and Workday Ventures ($24M raised), we help builders of SaaS platforms and AI Agents orchestrate hundreds of scalable, accurate, and enterprise-grade integrations. Our platform combines 25,000 pre-mapped actions on 200 connectors, an AI-powered integration development toolkit, plus security by design: a real-time architecture, managed authentication and permissions, and end-to-end observability.
Join us on our fast trajectory to build the future of agentic integrations.
With an AI-native integration toolkit that delivers real-time execution, managed authentication, granular permissions, and full observability, all built with safety at its core, we’re now doubling down on AI R&D & creating our own lab to push the boundaries of tool calling for agents: training specialized LLMs designed to outperform general-purpose models in what matters most: precision, reliability, and safety in agentic execution.
About The Role
We’re looking for full-stack engineers who can ship fast, think in systems, and obsess over scalability, performance & usability. You’ll build core APIs, scale infra, and ship dev tools & UIs that makes tool execution easy, safe and predictable.
It’s a broad role: backend-heavy, product-aware, and deeply technical. Expect to work across APIs, auth, infra, and frontend, building the foundation that lets agents take real action.
Responsibilities
- Act as a full-stack web application engineering: ideate, build, and ship features across frontend, backend, data, and infrastructure.
- Model data & schemas across SQL, document/columnar stores, and OLAP; design for correctness, performance, and cost.
- Design and evolve public APIs and standards: REST contracts, OpenAPI, pagination, auth, error models, plus MCP/tool-calling conventions.
- Proven experience as a full-stack engineer shipping user-facing, backend-heavy systems.
- Expertise in TypeScript and solid experience with React; comfortable building clean UIs for complex backend capabilities.
- Strong background designing and operating public APIs and multi-tenant systems.
- Experience with distributed systems concepts: streams, queues, idempotency, consistency, and performance trade-offs.
- Ability to think in systems (throughput, tail latency, failure modes) and explain trade-offs clearly.
- Curiosity and pragmatism with LLMs/agents: know when they help, and how to guardrail/evaluate them.
- Desire to work in a fast-paced startup, take ownership end-to-end, and bias toward shipping.
- (Preferred) Experience publishing CLIs & SDKs (internal or open-source).
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.), Cloudflare, Tinybird, Modal, Dagster, Langsmith, Datadog, Sentry, Incident.io
- Languages & Frameworks: Typescript (Node.js), Python, NestJS, React, Svelte,
- Other day-to-day Tools: Postman, Notion, Slack, Jira, Github and more
- 25 days holiday + 1 additional day holiday per year of tenure
We believe diversity drives innovation. We encourage individuals from all backgrounds to apply. As an equal-opportunity employer, we celebrate diversity and are committed to creating an inclusive environment for all employees.
Compensation Range: £65K - £100K