Pre-Sales Engineer

About StackOne

_StackOne is the universal integration layer for modern SaaS products. We’ve raised $24m in 2 years, and we’re backed by top tier investors like Google Ventures and Workday Ventures.

__Our unified API platform lets vendors ship hundreds of native, white label integrations in days, not months, by abstracting away dozens of disparate third party APIs into a single, normalized interface. On top of those APIs, we provide AI Agent Actions so customers can build agentic workflows without wrangling OpenAPI specs.

__StackOne sits behind the scenes as an embedded iPaaS: 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 that:

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• Sell to mid market and enterprise buyers
• Are building AI Agents in the near future
• Need deep, native integrations to win competitive deals and power their product
• Value time to integration over building connectors in house

_We typically close OEM and embedded licensing deals, multi-year (1 to 3 year) contracts, five to seven figure TCV, with a strong land and expand model. Key buyer personas are the CPO and CTO.

_Role Overview

As a Pre-Sales Engineer you will be the technical face of StackOne during the sales process. You will uncover real customer needs, craft solution architectures, deliver compelling demos, guide prospects through proof-of-concepts, and remove every technical barrier to closing the deal, while feeding product insights back to product & engineering. You will also ensure a smooth transition into onboarding with the Customer Success and Solutions Engineering (post-sales) team.

You’ll report to our VP Sales and partner 1-to-1 with Account Executives. Expect 20-25 % travel for key customer visits and events.

Your Responsibilities

• Discovery & Qualification: Lead technical discovery alongside Account Executives to map business goals, existing stack and success criteria; quickly triage whether StackOne offers the right fit.
• Solution Design & Demo: Architect tailored integrations / workflows, build repeatable but story-driven demos, and present to audiences ranging from developers to C-suite.
• Proof-of-Concepts: Own PoC scoping, success metrics, hands-on setup and troubleshooting to prove value within agreed timelines.
• RFP / Security Questionnaires: Craft clear, convincing technical responses that highlight StackOne’s differentiators and compliance posture.
• Stakeholder Enablement: Coach Account Executives on product nuances; create reusable demo assets and best-practice templates for the wider PSE team.
• Feedback loop: Channel field insights to Product & Engineering, influencing roadmap and prioritising high-impact features.
• Thought leadership & Events: Support webinars, trade-shows and community events; occasionally act as SME on emerging areas like Gen-AI connectors.

Core Qualifications

• 3-6 yrs in pre-sales, solutions engineering or equivalent hands-on practitioner role within an API, infrastructure B2B SaaS, or embedded platform.
• Fluency in REST/GraphQL APIs, webhooks, OAuth2/SAML, and at least one modern language (Node, Python, Go, Java).
• Able to whiteboard complex architectures and tell a business-value story that resonates with both engineers and execs.
• Comfortable managing multiple concurrent PoCs and deadlines in a fast-moving startup environment.
• Strong written skills for RFPs and security questionnaires; clear, confident live demo delivery.

Bonus points

• Familiarity with low-code integration platforms, iPaaS or workflow orchestration tools.
• Interest in Generative AI frameworks (LangChain, LlamaIndex) and how enterprises adopt them.

Why Join Us?

• Join one of Europe’s fastest-growing startups
• Work with a veteran team of ex-employees of Google, Microsoft, Oracle, Coinbase, JP Morgan and more
• Participation in the company’s employee share options plan
• 25 days holiday + 1 additional day holiday per year of tenure
• Flexible work setup - we're hybrid-friendly
• £1,000 for your home office set up + £500/year top-up
• Cycle2Work and Electric Cars scheme
• Private health insurance (including dental & optical)
• Health, fitness and gift card discounts
• Annual team offsite to sunny spots (last ones were in Spain and Portugal ☀️)

Ready to help us change the game for SaaS integrations? Get in touch and let's 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.

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