Fintech Qa Engineer: Card, Wallet & Api Testing

Foodstuffs; Auckland; On-site; NZD 120,000 - 160,000; Full time

Job summary

Crossware in Auckland is seeking a Senior Backend Developer to design, build, and maintain scalable backend systems used in real-world production environments, serving thousands of customers with focus on performance, reliability and maintainability.

You will evolve existing architectures and contribute to future design choices, collaborating with product and support teams to deliver robust, well-structured solutions in a hands-on engineering role.

Qualifications

• 3 years of relevant back-end experience in C#/.NET and API design.
• Azure cloud experience preferred.
• Knowledge of SQL and NoSQL databases and data modelling.
• Familiarity with system design, scalability, and performance optimisation.
• Experience with Git and CI/CD pipelines.
• Understanding of security, authentication, and backend best practices.
• Experience with legacy systems and modernisation (e.g., Visual Basic).
• Proficiency with AKS and Docker containers.

Responsibilities

• Design, build, and maintain backend services using C# and .NET.
• Develop and maintain APIs (RESTful and/or event-driven).
• Contribute to system architecture and technical design decisions.
• Ensure high performance, scalability, and reliability of production systems.
• Debug and resolve complex issues across backend, frontend, and cloud environments.
• Work with and incrementally improve legacy systems.
• Collaborate with engineers, product, and support teams to deliver robust solutions.
• Contribute to code quality, testing, and deployment practices.

Skills

C# & .NET

API design

Distributed systems

Azure

SQL & NoSQL databases

CI/CD pipelines

Git

Security & authentication

Legacy modernization

AKS & Docker

Tools

Azure

AKS

Docker

Git

Job description

Crossware is looking for a Senior Backend Developer to join our team in Auckland, working from the Crossware office, 40 hours per week. This is a hands-on engineering role focused on designing, building, and maintaining scalable backend systems used in real-world production environments, working on systems that serve thousands of customers, where performance, reliability, and maintainability matter. This is not a greenfield-only role, you’ll be improving and evolving existing systems while helping shape future architecture.

What You’ll Do:

• Design, build, and maintain backend services using C# and .NET
• Develop and maintain APIs (RESTful and/or event-driven)
• Contribute to system architecture and technical design decisions
• Ensure high performance, scalability, and reliability of production systems
• Debug and resolve complex issues across backend, frontend, and cloud environments
• Work with and incrementally improve legacy systems
• Collaborate with engineers, product, and support teams to deliver robust solutions
• Contribute to code quality, testing, and deployment practices

What We’re Looking For:

Core Technical Skills 3 Years relevant work experience in the following:

• Strong experience with C# and .NET (Core/Framework)
• Solid understanding of API design and distributed systems
• Experience with cloud platforms (Azure preferred)
• Knowledge of databases (SQL and/or NoSQL) and data modelling
• Familiarity with system design, scalability, and performance optimisation
• Experience with version control (Git) and CI/CD pipelines
• Understanding of security, authentication, and best practices in backend systems
• Experience working with legacy systems and modernisation efforts (e.g. Visual Basic)
• Solid functional understanding of Azure Kubernetes Services (AKS) and Docker containers.
• You understand what it means to run software in production at scale
• You take ownership, not just of features, but of system stability and reliability
• You are comfortable debugging real-world issues across multiple layers
• You are pragmatic and able to work with existing systems, improving them over time
• You care about writing maintainable, well-structured code
• You can use AI tools effectively, while applying judgement, validating outputs, and maintaining engineering standards

Nice to Have

• Experience with Microsoft 365 technologies (Exchange, Graph API, Teams, Outlook)
• Exposure to messaging systems, background processing, or event-driven architectures

How We Work

We don’t expect you to know everything. What matters is your willingness to learn, adapt, and grow beyond your current focus. You’ll be supported by a team that values practical problem-solving, ownership, and continuous improvement.

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