Senior Software Engineer - Wise Platform - API Experience

Description

The API Experience team runs the public API gateway, the OAuth2 authentication and authorization systems, SDKs, and developer tooling. Both partners and internal teams depend on this work.

The team aims to make financial APIs that developers find easy to use, secure, and ready for large enterprises. The work covers scaling across more than 700 microservices, improving the developer experience for global banks, meeting strict financial security standards, and keeping integration simple at high volume.

The company is a global technology business that moves and manages money across borders, with over 13 million customers. Its the company Platform lets banks, software companies, and large enterprises use its international infrastructure through public APIs and backend services. The cross-functional team is based in London, New York, Singapore, Tallinn, and other locations.

Responsibilities

• Build and operate backend services that scale well, using Java, Spring Boot, Kafka, and PostgreSQL in an event-driven microservices setup.
• Set API standards covering RESTful design, OpenAPI/Swagger, and OAuth2, and build SDKs, developer tools, and reference implementations that reduce integration work for major partners.
• Lead technical quality by promoting good engineering practice, reviewing code, taking part in domain-driven design modelling, and mentoring junior engineers.
• Work with product managers, implementation managers, solutions engineers, and partner developers to define features, shape technical solutions, and influence product strategy.
• Work across frontend and infrastructure stacks, helping decentralized engineering teams follow the API standards and architecture patterns.
• Collaborate directly with engineering hubs around the world, including travel to the Tallinn office.

Requirements

• Proven experience designing, building, and maintaining production public APIs, including RESTful APIs, OpenAPI/Swagger, and OAuth2.
• Extensive experience with Java and Spring Boot for building resilient backend microservices.
• Hands-on work with event-driven systems such as Kafka or similar messaging tools, and with relational database design and tuning in PostgreSQL or MySQL.
• Working knowledge of domain-driven design, microservices patterns, and building for high availability and low latency.
• A customer-centric approach that balances technical excellence with business context, user experience, and cost efficiency.
• Ability to explain complex technical concepts to non-technical stakeholders, work across business units, and adapt to feedback.
• Experience with financial-grade security standards, compliance requirements, or international payment systems such as FX, funding, settlement, or interbank networks.
• Familiarity with frontend frameworks or infrastructure and gateway tooling.
• Experience maintaining open-source developer libraries, SDKs, or developer portals.

Conditions

Hybrid working model.

Only local candidates are being considered, because relocation support is not provided.

For local candidates, transfer of visa sponsorship is supported.

Starting salary of 87,500 to 111,000 GBP, plus RSUs.

The company welcomes diverse teams and values inclusion, and it aims to give every employee respect and room to grow.

Benefits

• Access to the company's benefits package.