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

Wise; Greater London; On-site; GBP 111,000 - 145,000; Full time

Benefits offered by this job

RSUs

Wise Benefits

Job summary

Wise is hiring a Senior Software Engineer for the Payin Platform in our London office. You will help shape how customers move money, building Payin Session and Payment abstractions used across product lines and payment methods. The role emphasizes correctness, reliability, and scalable API design.

You will collaborate with multiple product teams, own end‑to‑end delivery on critical paths, and advocate for robust testing and best practices to enhance customer experience.

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, 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
• Have a strong product mindset and passion for customer experience, 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

Responsibilities

• Build the Payin Session and Payment abstractions that let every product integrate a payment method once and scale to millions of transactions.
• Ensure high volume, high‑leverage platform reliability and thoughtful API design.
• Collaborate with product teams across Transfer, Acquiring Payment, and new products to deliver robust Payin capabilities.
• Write testable code and contribute to testing strategies, including unit and integration tests.

Skills

Java

Kotlin

Python

Go

Spring Framework

Relational Databases

Distributed Systems (Kafka)

Cross-team Communication

Unit/Integration Testing

Code Reviews

Tools

Kafka

Spring

Job description

About the company

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

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 the 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 you will 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

• 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
• Have a strong product mindset and passion for customer experience, 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

Benefits

• Starting salary: 111k – 145k GBP + RSUs
• Wise Benefits