Product Engineer
Product Engineer
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Job Description
About StackOne
StackOne is the universal integration gateway for modern SaaS products and agents. Weve raised $24m in 2 years and were backed by top tier investors like Google Ventures and Workday Ventures.
StackOne sits behind the scenes as the integration layer providing thousands of tools: SOC 2 compliant multi-tenant and invisible to end users powering integrations for future-of-work SaaS categories such as HR Compliance and AI Agents.
Our customers are established B2B SaaS companies or small to enterprise companies building Agents to sell or to improve their own processes.
About the role
Were building a world where users of any SaaS can integrate with the tool of their choice in one click thanks to StackOne. Were 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.
We are looking for a Software Engineer with a strong background in AI production-grade applications with professional experience working with LLMs (eg: GPT Anthropic and others).
In this role you will deliver AI features and products end-to-end and work with the wider AI team of StackOne (comprising of AI researchers and other AI engineers). You will report directly to the CTO.
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.
Employment Type
Full-Time
