Senior Back End Engineer

Crescent Consulting; Christchurch; Hybrid; NZD 120,000 - 180,000; Full time

Benefits offered by this job

KiwiSaver employer contributions

Healthcare

Birthday day off

Extra annual leave

Share Purchase Plan

Volunteering day

Office fruit, snacks and drinks

Mental health resources

Job summary

XE, a global payments and FX platform, is expanding its Christchurch/Auckland-based backend team. This hands-on senior role focuses on building reliable backend systems, APIs, and data flows that underlie cross-border payments and multi-currency support.

You'll collaborate with product, compliance, and operations, adopting AI-assisted development tools and modernCloud practices to modernise our platform. Hybrid work options available in NZ.

Qualifications

• Strong backend software engineering experience in production environments.
• Solid experience with C#/.NET or other OO backend languages (Java, Kotlin, Go).
• Good SQL and relational database fundamentals.
• Experience designing and building APIs, services, and integrations.
• Strong understanding of system design and architecture.
• Experience with service-oriented, microservices, or event-driven systems.

Responsibilities

• Design, build, and own backend services supporting payments, FX, onboarding, settlement, KYC/KYB, and multi-currency flows.
• Develop APIs, integrations, and service layers used across XE’s platform.
• Work with AWS and cloud deployment practices.
• Contribute to CI/CD, automated testing, and production readiness.
• Lead design reviews and contribute to architecture decisions.
• Mentor intermediate engineers and raise engineering standards.

Skills

C#/.NET

APIs & Integrations

SQL

AWS

CI/CD

Reliability & Observability

Architecture & Design

Mentoring

AI-assisted development

Backend systems

Tools

Postman

Jira

Confluence

Bruno

Job description

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Crescent Consulting - Christchurch, South Island

XE | Christchurch or Auckland | Hybrid

XE are growing their technology team and are looking for a Senior Back End Engineer to help build and modernise the systems behind a global payments and foreign exchange platform.

XE supports consumers and businesses across New Zealand, Australia, the UK, Canada, and the US, helping them collect, convert, hold, and send money across international markets. The business has global scale through Euronet Worldwide, but the team is still small enough for engineers to have real ownership, influence, and visibility across the work they deliver.

The role

This is a hands-on senior backend engineering role working on the services, APIs, data flows, integrations, and production systems that support XE’s cross-border payments products.

You’ll be joining XE during a key stage of technology growth and platform modernisation. The business is rebuilding core platform capability across corporate and consumer products, and the NZ team is playing an important role in that work.

You’ll work closely with product, compliance, operations, architects, team leads, and other engineers to turn complex requirements into reliable, well-designed backend systems. The role is internal-facing rather than client-facing, but you’ll need to communicate clearly, contribute to technical decisions, and help raise engineering standards within your domain.

XE is also moving strongly into AI-assisted engineering. Tools such as GitHub Copilot, Cursor, Claude Code, or similar are part of how the team builds, tests, documents, and ships software. This role will suit someone who is already using AI tools in a practical way, or who has a strong view on how they can be used responsibly in modern software delivery.

What you’ll be doing

• Designing, building, and owning backend services that support payments, FX, onboarding, settlement, KYC/KYB, and multi-currency flows
• Developing APIs, integrations, and service layers used across XE’s platform
• Working with C#/.NET and related backend technologies
• Designing data models and working with SQL and relational databases
• Building and supporting cloud-based services on AWS
• Contributing to CI/CD, deployment practices, automated testing, and production readiness
• Owning production health across your domain, including reliability, observability, incident response, and continuous improvement
• Helping modernise legacy systems into XE’s newer platform architecture
• Leading design reviews and contributing to architecture decisions
• Mentoring intermediate engineers and supporting stronger engineering practice across the team
• Using AI-assisted development tools as part of your everyday workflow

What we’re looking for

• Strong backend software engineering experience in production environments
• Solid experience with C#/.NET, or another object-oriented backend language such as Java, Kotlin, or Go
• Good SQL and relational database fundamentals
• Experience designing and building APIs, services, and integrations
• Strong understanding of system design and architecture
• Experience with service-oriented, microservices, or event-driven systems
• Exposure to AWS and modern cloud deployment practices
• Experience writing and maintaining automated tests
• Confidence working with CI/CD pipelines and production release processes
• A practical approach to reliability, observability, and production support
• Experience contributing to technical direction, design reviews, and mentoring
• Clear written and verbal communication skills
• Genuine comfort using AI-assisted development tools as part of modern engineering delivery

Experience in payments, foreign exchange, banking, fintech, insurance, or another regulated environment would be useful, but it is not essential.

Experience with ledgers, financial data systems, partner integrations, platform migrations, caching tools such as Redis or Memcached, Jira, Confluence, Postman, or Bruno would also be valuable.

Why this role is worth considering

• Complex backend product and platform work, not just feature delivery
• Exposure to global payments, FX, and regulated financial systems
• A role with ownership of architecture, services, data, reliability, and production outcomes
• The chance to help modernise a platform used across multiple international markets
• A NZ-based engineering team with global reach
• A modern AI-assisted development environment
• A role where senior engineers are expected to influence, mentor, and stay close to the code

Working arrangement

The role is based in XE’s Christchurch or Auckland office with a hybrid working model. Alternatively, there is an option to work out of the Auckland office in a hybrid arrangement also.

You’ll work with local colleagues as well as global teams across XE’s wider technology function. Because XE operates internationally, there may occasionally be calls or collaboration with teams in other regions.

Benefits

• Competitive salary
• KiwiSaver employer contributions on top of salary
• Healthcare
• Birthday day off
• Extra annual leave for each year of service, up to five additional days
• Discounted Euronet Employee Share Purchase Plan
• Volunteering day for a charity of your choice
• Office fruit, snacks, drinks, and coffee
• Mental health and wellbeing resources through Plumm