QA Automation Software Engineer

About Numeral
Numeral is a payment technology provider that enables fintechs, payment services providers, and banks to launch new products, expand geographically, comply with payment regulations, and scale their operations with Numeral's cloud-native, API-first payments platform.

We develop and run direct integrations with a network of 30+ partner banks (including BNP Paribas, Barclays, Citi, HSBC, Banking Circle, LHV…) that can all be accessed through a single API, webhooks, and dashboard.

Customers include leading and up-and-coming fintechs like Spendesk, Swile, Alma, WorldFirst, Argentex, Deblock, and 20+ others. We have processed more than 4m payments since our first payment in 2023 and will process more than 10m payments over the next 12 months.

Founded in July 2021, Numeral has been acquired by leading core banking system provider Mambu in December 2024. Mambu’s composable core banking system complements Numeral’s API-first payments platform perfectly. Together, we are poised for hyper-growth, serving both Mambu and non-Mambu customers globally, challenging industry giants like FIS, Bottomline, and Volante, and delivering an even greater impact across our ecosystem.

This acquisition marks an exciting new chapter for Numeral. To support this growth, we are hiring across teams to scale our organisation and continue delivering exceptional customer value.

Learn more about Numeral and Mambu:

• Numeral
• Mambu
• Numeral joins forces with Mambu
  
  
  
  

Our technology stack

Our technology stack is built on a robust microservices architecture, leveraging domain-driven design (DDD) principles and an hexagonal approach to ensure flexibility, scalability, and clear separation of concerns. We prioritize simplicity, maintainability, and adherence to industry best practices, with test-driven development (TDD) at the core of our engineering philosophy.

Our development process is deeply rooted in lean and agile methodologies, fostering a culture of continuous improvement and problem-solving. We embrace an iterative approach, delivering incremental value through frequent releases and short feedback loops.

Backend

• Programming language: Golang
• Messaging: Kafka (AWS MSK)
• Databases: AWS DynamoDB, AWS Aurora PostgreSQL, and AWS RDS
• Caching and In-Memory Data Store: AWS MemoryDB (Redis)
• Search and Analytics Platform: AWS OpenSearch
• Serverless Computing: AWS Lambda
  
  
  
  

Infrastructure

• Cloud provider: AWS Cloud
• Orchestration: Kubernetes (AWS EKS)
• Infrastructure as code: Terraform
• Monitoring and logging: CloudWatch, Prometheus, Grafana, Datadog…
• CI / CD: GitLab
  
  
  
  

Frontend

• Programming Language: TypeScript
• Framework: ReactJS
• UI library: Chakra UI
  
  
  
  

The role

We are hiring QA Automation Software Engineers across all teams and seniorities. You will join a product and engineering organisation of 20+ people, with 15 more people joining in 2025.

Responsibilities

• Designing, developing, and maintaining automated test suites with a primary focus on back-end systems, while also covering some front-end (ReactJS) testing to ensure product quality and reliability
• Collaborating with Product Management, Software Development, DevOps, and Security teams to maintain a fast-paced, iterative, and continuously improving delivery process
• Developing and executing test plans and strategies that encompass both functional and non-functional testing, including performance and security
• Creating and managing comprehensive test cases, leveraging tools and frameworks for automated testing of APIs and UI where necessary
• Integrating automated tests into CI / CD pipelines to ensure seamless and reliable deployments
• Providing feedback to the engineering team by identifying, documenting, and tracking issues and defects
• Ensuring the scalability, reliability, and performance of back-end services and APIs
  
  
  
  

Your profile

• Solid experience in building and maintaining automated test frameworks, with a primary focus on backend testing
• Proficiency in testing modern APIs, including functional, integration, and security testing
• Experience with CI / CD pipelines and integrating automated tests into build processes
• Knowledge of software testing best practices, including TDD and BDD methodologies
• Strong analytical and problem-solving skills, with an eye for detail
• Autonomous and proactive, with a strong focus on quality and continuous improvement
• Nice to have: experience with banking and payment systems (SEPA, Swift, Ebics...)
• Nice to have: exposure to DevOps practices and tools, including GitLab, Kubernetes (K8s), and AWS (EC2, S3, EKS, RDS)
• Nice to have: familiarity with message broker middleware such as Kafka
• Nice to have: familiarity with SQL and NoSQL data stores
• Nice to have: knowledge of performance testing tools and strategies
• Nice to have: security testing experience for APIs and frontend applications
  
  
  
  

Compensation And Benefits

• Attractive compensation plan including stock options
• Remote-first: work anywhere in Europe and come at your convenience to any Numeral / Mambu office
• International team with 6+ different countries and frequent off-sites
• Sustainable mobility package and lunch vouchers
• Choose the best tools and equipment
  
  
  
  

Our values

• Make our customers win – What drives us is what we enable for our customers. We go all out to allow them to embed payments powering new products, features, and user experiences. We put our customers first. Our mission is to solve their problems, one at a time. We empower them with the best products. We unlock innovation and business
• No shortcuts – We take great care in what we do so our customers can rely on us. This means taking ownership of problems and solutions, paying attention to details, seeking constant improvement, and never opting for the easy way out
• Embrace feedback – We use humility to stay at the cutting edge. We seek and give honest feedback, we are excited about learning, and we inspire each other to grow
• Think big – We want to have an impact by pushing the limits and tackling complex problems. We don’t give up until we reach success and look forward to our next challenge
• Enjoy the journey together – Entrepreneurship is a journey that is best enjoyed as a team. We enjoy working and spending time together, we inspire each other to achieve great things, and celebrate as a team when they happen
  
  
  
  

Hiring process

• Screening call with Numeral / Mambu TAM
• Interview #1
• Interview #2
• Technical test
• 2 reference calls