Senior Software Engineer II - Payin Platform - Backend (Java)
At a glance
Senior Backend Engineering role at Wise. London · full-time · £111,000–£145,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Build Payin Session and Payment abstractions so product teams can connect payment methods once and reuse them at scale
- Design dependable, high-volume platform systems with careful API choices, correctness and reliability
- Take customer problems from start to finish, owning projects and driving them toward their goals
- Work across teams to explain and advocate for complex technical decisions to engineering and non-technical colleagues
What you bring
- At least five years working with Java, Kotlin, Python or Go
- Strong experience with Spring, relational databases, distributed and concurrent systems, including Kafka
- You write testable code and have used unit and integration testing strategies
- You communicate technical topics clearly across teams and to non-technical audiences
Who this fits
This senior engineering role suits someone who can work independently, take end-to-end ownership and make customer-focused, data-informed decisions. The job is based in Wise’s London office and is listed as onsite.
From the employer
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.
More about our mission and what we offer.
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 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.
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
Interested? Find out more:
Wise Engineering – https://medium.com/wise-engineering
What do we offer:
Starting salary: 111K - 145K GBP + RSUs
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.
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