Product Engineer
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Job Summary
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 25000 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 were 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
Were looking for full-stack engineers who can ship fast think in systems and obsess over scalability performance & usability. Youll build core APIs scale infra and ship dev tools & UIs that makes tool execution easy safe and predictable.
Its 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.
Engineer for scale and resilience: rate limiting retries idempotency back-pressure caching SLIs/SLOs and safe fallbacks.
Build and operate event systems with Kafka-class streaming patterns: producers/consumers partitioning DLQs reprocessing schema evolution.
Raise observability & reliability: tracing metrics logs alerting zero-downtime deploys runbooks.
Leverage LLMs/agents to accelerate development while maintaining reliability testing and code quality.
What were looking for
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).
Our Stack
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
Languages & Frameworks: Typescript () Python NestJS React Svelte
Other day-to-day Tools: Postman Notion Slack Jira Github and more
Benefits
25 days holiday 1 additional day holiday per year of tenure
Participation in the companys employee share options plan
Private health insurance (including dental & optical)
Health fitness and gift card discounts
1000 for your home office set up 500/year top-up
Paid lunch in the office
Annual team offsite to sunny spots (last ones were in Spain and Portugal )
Join one of Europes fastest-growing startups
Work with a veteran team of ex-employees of Google Microsoft Oracle Coinbase JP Morgan and more
Cycle2Work and Electric Cars scheme
Hybrid work set up - typically 2d in the office
Ready to help us change the game for SaaS integrations Get in touch and lets chat!
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.
Key Skills
- APQP
- Six Sigma
- GD&T
- Root cause Analysis
- CAD
- Project Leadership
- SolidWorks
- Mechanical Engineering
- Quality Management
- Product Development
- Catia
- Manufacturing
About Company
One integration platform, two powerful interfaces: Unified APIs for SaaS products, and AI Agent Actions. Ship hundreds of integrations in days.
