Senior Software Development Engineer in Test

Job Title: Senior Software Development Engineer in Test (SDET)

Location: Belfast, Northern Ireland

Work Arrangement: Hybrid

Position Overview

We are seeking an experienced Senior Software Development Engineer in Test (SDET) to act as a catalyst for quality across our engineering organisation. You will be a first‑class engineer who builds & maintains our automated testing infrastructure, enabling rapid feedback cycles and the delivery of high‑quality software at speed. This is a technical leadership role: you will advocate for quality throughout the software development lifecycle, design test strategies, influence our test architecture, mentor others in test automation, and partner with engineering teams to build quality in from the ground up rather than test it at the end.

We are an AI‑enabled engineering team, and we believe the future is about empowering engineers with the latest tools, building through custom skills, agents, and harnesses, and we are looking for people who embrace AI, are excited about the future, and want to shape the way we embed AI tooling throughout our developer experience.

If you are passionate about quality engineering, comfortable using AI tooling to work faster and smarter, and want to shape testing practice in a fast‑paced fintech environment, we want you on our team.

About Us

Recently ranked #482 on the Inc. 5000 fastest growing companies in the United States, Biller Genie is an award‑winning B2B SaaS platform that is entering the Belfast market with ambitious plans to scale our team rapidly, with over 100 hires planned through 2028.

Primary Job Responsibilities

Test Architecture: Design and implement scalable test automation frameworks that enable rapid feedback and continuous testing

Quality Engineering: Partner with development teams to build quality into the development process through test automation, code reviews, and best practices

Innovation: Research and implement new testing tools and methodologies, including AI and agentic engineering approaches, to improve our testing efficiency and coverage

Continuous Improvement: Lead initiatives to enhance our testing infrastructure, practices and metrics to drive quality improvements

Technical Leadership: Mentor team members in test automation best practices and quality engineering principles

Perform other duties required by Management

Essential Criteria

BSc or MSc in Computer Science, Software Engineering or related field OR equivalent commercial experience

Minimum 5 years of software testing experience in SaaS environments

Strong proficiency in at least one object‑oriented programming language, ideally C#, though strong OO fundamentals in Java, Python or a similar language are equally welcome

Extensive hands‑on experience with test automation frameworks and tools (e.g. NUnit, xUnit, Moq, SpecFlow/Reqnroll, or the equivalents in your language of choice)

Experience with API testing tools and techniques (e.g. Postman, RestSharp)

Experience with UI/browser automation (e.g. Playwright, Selenium)

Practical experience working with AI and agentic engineering processes

Working knowledge of SQL and database testing

Familiarity with CI/CD pipelines and tools

Experience of cloud technologies such as Azure, AWS, GCP

Proficient with Git and related workflows

Strong attention to detail and work ethic

Strong analytical and problem-solving skills

Excellent communication (both written and verbal) and interpersonal skills

Ability to work effectively with cross‑functional teams

Legal right to work in the UK

Desirable Criteria

Proficient with Claude or Claude Code

Experience with performance testing frameworks and tools (e.g. k6, JMeter, NBomber)

Knowledge of security testing principles and tools

Experience with test data generation and management

Experience of LEAN software development practices

Experience with Azure Functions and Queues

ISTQB Advanced Level or relevant technical certifications

Experience in the Financial services industry

Experience mentoring engineers or leading a test/QA function

What We Offer

Private health insurance

Group life death benefit

Auto‑enrollment pension with employer contributions matched to 5%

25 days holiday per year

10 statutory/bank holidays per year

Opportunities for professional growth and development

A collaborative and innovative work environment

Our Mission

To provide an automated A/R platform that seamlessly integrates existing business processes for the SMB market.

Our Core Values

Get Shit Done Right - We work hard and ensure tasks are completed correctly and on time, every time.

Own it - We are subject matter experts who know what we know, and we are confident enough to speak up when we see something wrong.

Catch Up - We are high performers and love a fast‑paced environment.

Believe in the Genie - We are passionate about where we are going as a team, and we show we care.

Class Shines - We are articulate professionals who carry ourselves well and speak with purpose.

Pleasenote we are unable to offer visa sponsorship.

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