Senior Quality Assurance Engineer, BUX
Event Streaming
Stocks, crypto & ETF brokerage app
Be an early applicant
Stocks, crypto & ETF brokerage app
101-200 employees
Be an early applicant
101-200 employees
Company mission
BUX's mission is to make investing easy and affordable for all.
Role
Who you are
- 5–7+ years of experience in software quality assurance, with a senior-level track record of hands-on testing in the fintech domain
- Hands-on testing experience with Kafka or comparable event-streaming platforms
- Strong knowledge of API testing (REST) and microservices/event-driven architectures
- Hands-on experience with test automation frameworks such as Selenium and Playwright with TypeScript
- Proficiency in at least one programming language (Java/Kotlin)
- Understanding of CI/CD pipelines and integration of automated tests (GitHub Actions)
- Practical experience with Postman/Newman, Charles Proxy, and Xray (or similar test management tooling)
- Comfortable validating data consistency across multiple database technologies and asynchronous event flows
- Experience helping establish or mature QA processes for event-driven systems
- Experience working in a fast-paced Agile environment
- Excellent communication and collaboration skills with cross-functional teams
- This role reports to the Staff QA Engineer
- Nice-to-haves
- Experience with fintech or financial services testing (financial accuracy, transactional data, regulatory compliance)
- Experience with performance and security testing
- Knowledge of financial regulations and compliance standards (KYC/AML)
- Experience with schema registries and contract testing tools for event-driven architectures
What the job involves
- We are looking for a Senior Quality Assurance Engineer (Event Streaming) to join our BUX team based in Amsterdam
- Our engineering team sits at the heart of the company
- We have a well-rounded team that cares about building great products that matter
- You'll be part of a modern fintech company where you can try things, break things, fix them, and learn fast
- Your work is visible, your input matters, and you help shape both the product and how we build it
- We stay close to what's happening in the world of investing and fintech, and we share what we learn
- It's a place where you can stretch your skills, contribute to something real, and grow alongside people who take their craft seriously and enjoy building things together
- In a fintech environment, reliable event streaming is critical; a missed or duplicated message can affect ledger balances, payment workflows, and compliance
- You'll play a hands-on role in validating the correctness, reliability, and resilience of our Kafka-based event-driven systems
- As a Senior Quality Assurance Engineer for our Backend Broker team, your job is to get things done
- Design, develop, and maintain automated and manual tests for Kafka-based producers, consumers, and event flows
- Execute manual and exploratory testing where automation is not feasible
- Integrate automated regression, smoke, and integration test suites into CI/CD pipelines (GitHub Actions)
- Help build and mature QA processes and standards for event-driven systems within the squad
- Apply quality gates and acceptance criteria in close collaboration with Product and Development teams
- Participate in design reviews for owned features and event schemas to provide a QA perspective early in the development cycle
- Monitor and track key quality metrics, test coverage, and defect trends for the streaming domain
- Validate message ordering, delivery guarantees, idempotency, and exactly-once/at-least-once semantics
- Validate producer and consumer contracts and schema compatibility as services evolve
- Perform failure-mode and resilience testing — including broker failures, consumer lag, retries, dead-letter handling, and replay scenarios
- Perform bug triage, reproduction, and prioritization with development teams
- Support test environment setup, data provisioning, and maintenance in coordination with DevOps
- Use approved GenAI tooling with sanitized data to accelerate test design and automation, subject to human review, security policies, and validation of generated tests
- Our tech stack
- Java, Kotlin, Spring Boot, GCP, Kubernetes, GitHub Actions, Kafka, REST APIs, Selenium, Playwright/TypeScript, Postman/Newman, Charles Proxy, Xray, CloudSQL, PostgreSQL
Application process
- We usually respond within three days
Our take
Recent innovations in banking and apps have opened the door for the average consumer to engage in a new set of financial services. BUX facilitates this as Europe’s fastest growing neobroker.
While the application has not reached the omnipresent level of market leaders like Robinhood, BUX is the first and only business to have built a full-stack system of its own, giving it the ability to adapt and scale in a way competitors cannot. Keeping up with the evolving investment space, the company launched BUX Crypto in 2022, granting its thousands of users access to trading cryptocurrencies like Bitcoin.
Also in 2022, the company purchased the retail arm of neobroker Ninety Nine, with all its existing retail customers moving over to BUX. This has significantly bolstered its Spanish marketshare, as it moves ahead with a strategy to double down on its flagship application and help clients build long-term wealth moving into the future. The sale of BUX's Cyprus arm to Coinbase in 2024 will allow BUX to hone in on market presence and product capabilities.
Steph
Company Specialist at Welcome to the Jungle
Insights
21% employee growth in 12 months
Company
Funding (last 2 of 6 rounds)
Apr 2021
$80m
LATE VC
Jun 2019
$8.8m
LATE VC
Total funding: $111.7m
Company benefits
- Work from anywhere in the world for one month per year
- Unlimited 1-on-1 access to on-demand coaching and mindfulness consultations with psychologists through OpenUp
- A supportive environment that encourages continuous learning and development
- Dedicated training budget for to use towards improving current skills or learning something entirely new
- Celebrations - we make sure to do plenty of fun stuff together, like dinner and drinks or activities like flyboarding, rafting and off-road jeep driving
Company HQ
Plantage, Amsterdam, Netherlands
Leadership
Yorick Naeff
(Co-Founder & CEO)Started at ING as a Management trainee where he became a Senior Manager after only three years. Worked as COO at Bux for 5 years before becoming UK CEO and then CEO of the entire organisation in 2021.
Egbert Pronk
(Co-Founder & CFO)Worked in options trading for over a decade, eventually becoming Head of Trading for Van der Moolen. After that, Egbert worked as CFO for a large consumer baked goods brand based in the Netherlands.
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