Senior Software Engineer II - Payin Platform - Backend (Java)

United States Digital Space LLC; Greater London; On-site; GBP 111,000 - 145,000; Full time

Benefits offered by this job

RSUs

Wise Benefits

Job summary

As part of a high-impact, cross-functional team, you’ll own end-to-end features and contribute to a customer-centric, data-driven culture. Strong coding practices and a passion for improving the product experience are essential.

Qualifications

• 5+ years of experience in Java, Kotlin, Python or Go.
• Strong experience with Spring framework, relational databases, distributed and concurrent systems (Kafka).
• Great cross-team communication – can discuss and champion complex, technical topics with a wide and varied audience across many teams.
• Experience in writing testable code and testing strategies (unit/integration).
• Follow best coding practices, code reviews and open feedback.

Responsibilities

• Build Payin Session and Payment abstractions to enable product integration of payment methods at scale.
• Develop high-volume, high-leverage platform components used by many teams.
• Design correct, reliable APIs and robust services with a focus on reliability.

Skills

Java

Kotlin

Python

Go

Tools

Spring framework

Relational databases

Kafka

Job description

Wise is a global technology company, building the best way to move and manage the world’s money.

Min fees. Max ease. Full speed.

Whether people and businesses are sending money to another country, spending abroad, or making and receiving international payments, Wise is on a mission to make their lives easier and save them money.

As part of our team, you will be helping us create an entirely new network for the world's money.

For everyone, everywhere.

Job Description

About the role:

We are looking for a talented Senior Software Engineer to join our Payin Platform team in the London office. This team owns a layer that powers how money enters Wise. The platform sits between our product teams (Transfer, Acquiring Payment, and any new product that needs to take money in) and the payment methods we support (Cards, Apple Pay, Google Pay, Balance, Bank Transfer, PISP, UPI, Direct Debit, and more).

What will you be working on?

Rather than owning a single payment method, we build the Payin Session and Payment abstractions that let every product integrate a payment method once and scale to millions of transactions without re‑solving the same problems.

This is a high-volume, high-leverage platform role: the systems you build are used by many teams across the company, so correctness, reliability, and thoughtful API design matter enormously.

Qualifications

What do you need?

• 5+ years of experience in Java, Kotlin, Python or Go
• Strong experience with Spring framework, relational databases, distributed and concurrent systems (Kafka)
• Great cross-team communication – can discuss and champion complex, technical topics with a wide and varied audience, from fellow engineers to non-technical stakeholders across lots of teams.
• You enjoy writing testable code and you have experience in testing strategies, such as unit testing, integration testing
• You believe in and follow best coding practices, code reviews and open feedback
• You have great communication skills and the ability to articulate complex, technical concepts to non-technical audience
• You strive to improve our team culture and processes
• A strong product mindset and passion for customer experience, you prioritise work with the customers in mind and make data-driven decisions to fix customer pain‑points
• Being able to work independently on customer problems is a key to success – you take responsibility and end-to-end ownership of your projects: drive and own them to make sure we hit the goals we want to achieve

Additional Information

Interested? Find out more:

• How we work – a practical guide
• DEI @ Wise
• Wise Tech Stack (2025 update)
• See what it's like to work at Wise London!
• Our Engineering career map
• Wise Engineering – wisdom.medium.com

What do we offer:

• Starting salary: 111K – 145K 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.