Senior Software Engineer - Wise Platform - API Experience

SmartRecruiters, Inc.; Greater London; Hybrid; GBP 88,000 - 111,000; Full time

Job summary

Wise is seeking a Senior Software Engineer for the Wise Platform - API Experience team. You will design and maintain scalable backend services in Java/Spring Boot within a microservices architecture, driving API standards and developer tooling.

You’ll collaborate with product managers, solutions engineers, and cross-functional teams to deliver secure, enterprise-grade APIs. Opportunity to travel globally and contribute to a highly impactful platform.

Qualifications

• Experience designing production-grade public APIs (RESTful, OpenAPI/Swagger, OAuth2).
• Strong backend in Java/Spring Boot architectures.
• Experience with event-driven architecture using Kafka or similar.
• Relational database design/optimisation (PostgreSQL/MySQL).
• DDD and microservices patterns; high availability/low latency focus.
• Customer-centric approach balancing tech, UX, and cost.

Responsibilities

• Design & Architecture: Architect, build, and maintain scalable backend services using Java, Spring Boot, Kafka, and PostgreSQL.
• API Product Ownership: Set API standards (RESTful, OpenAPI/Swagger, OAuth2) and build developer tools and SDKs.
• Technical Leadership & Mentorship: Mentor engineers, conduct code reviews, apply DDD principles.
• Cross-Functional Collaboration: Work with PMs, Implementation Managers, Solutions Engineers, and partner teams.
• Cross-Organizational Impact: Align Wise engineering teams with API standards across frontend and infra.
• Global Travel: Collaborate with engineering hubs worldwide, including Tallinn.

Skills

Public API Experience

Java & Spring Boot

Distributed Systems

DDD / Microservices

Product Mindset

Communication & Collaboration

Tools

OpenAPI/Swagger

OAuth2

Kafka

Job description

Senior Software Engineer - Wise Platform - API Experience

• Full-time
• Compensation: GBP 87,500 - GBP 111,000 - yearly

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.

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.

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.

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

#LI-AB3 #LI-Hybrid

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 .

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