Software Engineer II - Golang

Mastercard; Slough; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A global payment technology firm seeks a Software Engineer II specializing in Golang to develop and maintain microservices. The ideal candidate will have expertise in Python and SQL, and an interest in data science and machine learning. Responsibilities include creating high-quality code, participating in code reviews, and engaging with a range of stakeholders. This hybrid role is based in central London, requiring attendance on designated team days.

Qualifications

• Demonstrable ability to write in Golang and Python.
• Detail oriented with a focus on quality code and testing.
• Interest in data science and machine learning technologies.

Responsibilities

• Create and maintain microservices primarily in Golang.
• Write tests with high coverage including unit, integration, and e2e.
• Participate in sprint planning and task ownership.

Skills

Golang

Python

SQL

DevOps

Job description

Software Engineer II - Golang

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• Job Reference: 2494793300-2
• Date Posted: 3 December 2025
• Recruiter: MasterCard
• Location: Slough, Buckinghamshire
• Salary: On Application
• Sector: I.T. & Communications

Job Description

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Software Engineer II - Golang Software Engineer Overview We are looking for a software engineer to join an award winning team with a proven track record of combining data science techniques with an intimate knowledge of payments data to aid Financial Institutions in their fight against money laundering and fraud. Headquartered in The City of London, we craft bespoke services that help our clients gain an understanding of the underlying criminal behaviour that drives financial crime, empowering them to take action. As part of the application development team, your role will focus on creating and maintaining products across the whole lifecycle.

Role

• Create and maintain microservices, primarily in Golang, taking increasing responsibility.
• Assist with design and build to solve bugs, improve performance, and add new features.
• Containerise your services and make ready for deployment onto a k8s environment using helm charts.
• Develop understanding of end-to-end technical architecture and dependency systems. Apply that understanding in code.
• Write tests with high coverage including unit, contract, e2e and integration.
• Version control code with git and build, test and deploy using ci/cd pipelines.
• Build and test remotely on your own machine and deploy to low level envs.
• Participate in the review of team members code.
• Perform demos and join acceptance discussions with analysts, developers and product owners.
• Assist in task planning and review as part of a sprint based workflow.
• Estimate and own delivery tasks (design, dev, test, deployment, configuration, documentation) to meet the business requirements.
• The role is hybrid, based in central London, and the expectation is that you attend the office according to Mastercard policy, including team days, which are currently on Monday and Thursday.

All About You

First and foremost, you want to build products to solve real, pressing problems for your customers. You enjoy working in a team, and have an interest in data science and how advanced algorithms may be deployed as product offerings. You are detail oriented, and enjoy writing and reviewing code to a high standard with tests to prove it. Demonstrable ability to write Python/Golang and SQL. You are happy to learn new programming languages and frameworks as necessary. You are interested in contemporary approaches to service design, including the use of containers and container orchestration technologies, streaming data platforms, APIs and in‑memory/NoSQL stores. You are familiar with working in a devops based software development workflow, including building, testing, and continuous integration/deployment. You are also happy to evolve along with the development process and contribute to its success. You have the ability to communicate with a range of stakeholders, including subject matter experts, data scientists, software engineers and enterprise devops and security professionals. You are keen to engage with best practices for code review, version control, and change control, balancing the need for a quality codebase with the unique and particular demands of scale up stage software engineering. You have experience or are keen to engage with productionising machine learning technologies.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must: Abide by Mastercard's security policies and practices;

• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.