Associate Integration Operations, StackOne

Salary not provided

+ Participation in the company’s employee share options plan

JavaScript

Python

Postman

JSON

REST API

Junior and Mid level

London

Remote from UK

Unified API for B2B SaaS

Open for applications

Unified API for B2B SaaS

21-100 employees

B2BArtificial IntelligenceBig dataDeep TechAnalyticsSaaSAPIData Integration

Open for applications

Salary not provided

+ Participation in the company’s employee share options plan

JavaScript

Python

Postman

JSON

REST API

Junior and Mid level

London

Remote from UK

21-100 employees

B2BArtificial IntelligenceBig dataDeep TechAnalyticsSaaSAPIData Integration

Company mission

To empower SaaS companies to build groundbreaking products that seamlessly connect with their customers’ stacks.

Job

Company

Role

Who you are

1–3+ years in a technical operations, integrations, RevOps, or support-engineering role (startup or infra/SaaS)
Comfortable with REST APIs, OAuth 2.0, webhooks, JSON, and reading OpenAPI/Swagger; you can test with cURL/Postman and write small scripts (Python/JS) to automate checks
Clear, concise writer who can turn complex flows into friendly docs
Systematic, detail-oriented, and calm under time pressure; you think in runbooks

What the job involves

Own the operational heartbeat of our integrations. You’ll support prioritization of work on integrations, keep our sandboxes working, track third-party API changes before they break things, research/prioritise new use cases, and publish clear customer-facing docs that make partnerships effortless. It's the opportunity to work at the heart of the agentic evolution of integration platforms
Sandbox management & automations: Provision/reset demo and test environments, seed data, maintain health checks to reduce downtime
Integration intelligence: Monitor vendor changelogs and deprecations, OpenAPI specs, and file tickets with owners; maintain an “integration coverage” matrix
Use-case & API research: For target connectors, map use-cases, produce short “integration briefs” and prioritise by customer value and effort
Docs & partnerships: Publish/update internal and customer-facing guides on our partnership process (security reviews, scopes, data flows), runbooks, and FAQ; drive consistency across the docs portal
Tooling & hygiene: Keep trackers up to date, improve internal scripts and dashboards, and suggest process/tool upgrades as we scale in the iPaaS/integration ecosystem

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

Insights

Strong hiring activity

Top investors

Glassdoor (5)

Company

Funding (last 2 of 3 rounds)

Apr 2025

$20m

Series A

Nov 2023

$3.6m

Seed

Total funding: $23.9m

Company benefits

Participation in the company’s employee share options plan
25 days holiday + 1 additional day holiday per year of tenure
Remote working friendly
£1,000 for your home office set up + £500/year top-up
Cycle2Work and Electric Car Scheme
Multiple company offsites per year
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)

Company HQ

Central London

Articles

StackOne Secures $3.6M in Seed Funding led by Episode 1

Ex-Google & Oracle execs raise £2.8m seed funding for startup

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.

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