Senior Software Development Engineer in Test; SDET

Overview

If you’ve been looking to join a fast-growing startup with a bold vision of a world where doing good is built into everything we do, then you’ve found the right place!

Backed by General Catalyst, the same investors behind Stripe and Airbnb, we’re one of Europe’s fastest-growing SaaS companies – building the technology that enables global enterprises to give, volunteer, and fund with confidence.

Our mission at Goodstack is to revolutionize how the world does good 🌎.

As a Series A social impact startup, we power global change through technology. We enable companies to seamlessly integrate positive impact into what they do through a unified platform while supporting nonprofits in gaining access to cutting-edge technology and finding new funding streams.

Global brands, including Google, OpenAI, Tik Tok, Linked In, HSBC, Atlassian and Twilio - as well as thousands of nonprofits, including the Red Cross, Cancer Research, and Oxfam - use Goodstack to make a difference.

In 2025 alone, we have facilitated $5 billion in donations to good causes. But this is just the beginning. We re building the world’s leading platform that powers donations to nonprofits globally.

To keep our momentum and deliver consistently high value to our partners, we need incredible people to help us on our journey – we need you.

Join us as Senior Software Development Engineer in Test (SDET) to ensure billions in donations reach the right causes. We’re looking for a Senior SDET who thrives on building automation frameworks, raising quality standards, and enabling product teams to move fast with confidence.

As a senior member of our engineering team, you’ll not only deliver robust testing solutions, but also shape our quality strategy, mentor engineers, and champion testability across the stack. If you care deeply about user journeys, love finding elegant solutions to complex testing challenges, and want to ensure that every release is something we’re proud of – this is the role for you.

• Lead the design and evolution of our automation testing frameworks for frontend (web) and backend (APIs).
• Partner with engineers and product managers before development starts to define testable acceptance criteria and prevent defects early.
• Own and expand our end-to-end testing using Playwright and API testing tools.
• Improve and maintain quality gates in CI/CD pipelines (Git Hub Actions), ensuring release confidence.
• Create and drive test strategies that balance automation, exploratory, and manual testing for complex user flows.
• Mentor engineers and SDETs, raising the bar for test coverage, reliability, and speed.
• Drive cross-team initiatives for test data management, environments, and observability of test results.
• Be a strong voice for the customer by validating holistic user flows and usability impacts.

You’ll work closely with:

• Product Engineers to design for testability and reduce defects.
• Product Managers to validate acceptance criteria and ensure releases meet customer needs.
• Platform & Dev Ops Engineers to optimise pipelines, environments, and release processes.
• Other SDETs/QA Engineers to set standards and share best practices across teams.

• You’ve led the delivery of a new automation capability or framework upgrade.
• You’ve reduced manual regression overhead by increasing automation coverage on critical paths.
• You’ve improved the reliability and visibility of tests in pipelines, leading to faster, safer releases.
• You’re actively mentoring engineers on writing effective tests and shaping team-wide quality practices.

• 5+ years experience in SDET, QA Automation, or Test Engineering roles.
• Strong hands-on experience in automation testing across frontend and APIs.
• Expertise in JavaScript/Type Script for writing tests and frameworks.
• Deep experience with Playwright (or similar end-to-end testing frameworks).
• Experience with API testing tools (e.g., Postman, Pact, Super Test).
• Strong knowledge of CI/CD pipelines (Git Hub Actions or similar) for release quality gates.
• A holistic product mindset – you care about the user journey and not just individual…