Senior API Product Engineer - Wise Platform

Wise; Greater London; On-site; GBP 88,000 - 111,000; Full time

Benefits offered by this job

Wise Benefits

Job summary

Wise is recruiting for an API Experience Engineer to design and scale backend services using Java, Spring Boot, and Kafka. You will own API standards, contribute SDKs and reference implementations, and mentor engineers across Wise.

You will collaborate with product and implementation teams to shape features, drive a developer-first approach, and ensure secure, scalable integrations for international partners. Local candidates in London preferred.

Qualifications

• Public API design, development, and maintenance experience (RESTful, OpenAPI/Swagger, OAuth2).
• Strong Java and Spring Boot background for microservices.
• Event-driven architecture experience with Kafka and relational DB design/optimization.
• DDD, microservices patterns, high availability and low latency focus.

Responsibilities

• Design, architect, and maintain scalable backend services using Java, Spring Boot, Kafka, and PostgreSQL.
• Own API standards and developer tools to streamline integrations for partners.
• Provide technical leadership, code reviews, and mentorship across the team.
• Collaborate with PMs and partner teams to define features and solutions.
• Help align decentralized teams with API standards across Wise.
• Travel to engineering hubs including Tallinn when needed.

Skills

Public API Experience

Core Backend Stack

Distributed Systems & Data

Architectural Knowledge

Product Mindset

Communication & Collaboration

Job description

Company Description

About Wise & Wise Platform

Wise is a global technology company building the best way to move and manage the world’s money: min fees, max ease, full speed. With over 13 million customers and growing fast, we are building an entirely new network for the world's money.

Wise Platform enables banks, software companies, and large enterprises to leverage Wise's global infrastructure. Through our public APIs and backend infrastructure, our partners can offer their customers world-class international payment products. We are a cross-functional, global team spanning London, New York, Singapore, Tallinn, and beyond.

Job Description

About the API Experience Team

The API Experience team builds and maintains some of the most critical systems at Wise: the public API gateway, authentication/authorization systems (OAuth2), SDKs, and developer infrastructure used by our partners and internal teams.

Our goal is to set the gold standard for intuitive, secure, and enterprise-ready financial APIs. You will solve complex challenges around scaling microservices across our network of 700+ microservices, optimising developer experience for global banks, ensuring financial-grade security, and enabling seamless integration at scale.

What You Will Be Doing

• Design & Architecture: Architect, build, and maintain highly scalable backend services using Java, Spring Boot, Kafka, and PostgreSQL within an event-driven, microservices architecture.

• API Product Ownership: Set API standards (RESTful, OpenAPI/Swagger, OAuth2) and build developer-friendly tools, SDKs, and reference implementations to reduce integration complexity for major partners.

• Technical Leadership & Mentorship: Champion engineering best practices, conduct code reviews, participate in domain modeling (DDD), and mentor junior engineers across the team.

• Cross-Functional Collaboration: Partner closely with Product Managers, Implementation Managers, Solutions Engineers, and partner development teams to define features, shape technical solutions, and influence product strategy.

• Cross-Organizational Impact: Work across frontend and infrastructure stacks, helping decentralized engineering teams across Wise align with API standards and architecture patterns.

• Global Travel: Collaborate directly with engineering hubs across the globe, including travel to our Tallinn office.

Qualifications

What You Need to Succeed

• Public API Experience: Proven track record of designing, building, and maintaining production-grade public APIs (RESTful APIs, OpenAPI/Swagger, OAuth2).

• Core Backend Stack: Extensive experience with Java and Spring Boot for building resilient backend microservices.

• Distributed Systems & Data: Hands-on experience with event-driven architecture (Kafka or similar messaging systems) and relational database design/optimization (PostgreSQL, MySQL).

• Architectural Knowledge: Proficiency in domain-driven design (DDD), microservices patterns, and building for high availability and low latency.

• Product Mindset: A customer-centric approach to engineering—balancing technical excellence with business context, user experience, and cost efficiency.

• Communication & Collaboration: Ability to convey complex technical concepts to non-technical stakeholders, collaborate across business units, and adapt to feedback.

Nice to Have

• Experience with financial-grade security standards, compliance requirements, or international payment systems (FX, funding, settlement, interbank networks).

• Familiarity with frontend frameworks or infrastructure/gateway tooling.

• Experience maintaining open-source developer libraries, SDKs, or developer portals.

We are currently only considering local candidates as relocation support is not provided. For local candidates we are able to support transfer of visa sponsorship

Additional Information

Interested? Find out more:

• How we work – a practical guide

• DEI @ Wise

• Wise Tech Stack (2025 update)

• Our Engineering career map

• Scaling our Infrastructure; how we make it work

• Wise Engineering – https://medium.com/wise-engineering

What do we offer:

• Starting salary: 87500 - 111000 GBP + RSUs

• Wise Benefits

For everyone, everywhere. We’re people building money without borders — without judgement or prejudice, too. We believe teams are strongest when they are diverse, equitable and inclusive.

We’re proud to have a truly international team, and we celebrate our differences.
Inclusive teams help us live our values and make sure every Wiser feels respected, empowered to contribute towards our mission and able to progress in their careers.

If you want to find out more about what it’s like to work at Wise visit Wise.Jobs.

Keep up to date with life at Wise by following us on LinkedIn and Instagram.