Junior Software Engineer (.NET/C#) in London

About Us

Visa is a world leader in payments technology, facilitating transactions between consumers, merchants, financial institutions and government entities across more than 200 countries and territories, dedicated to uplifting everyone, everywhere by being the best way to pay and be paid. At Visa, you'll have the opportunity to create impact at scale - tackling meaningful challenges, growing your skills and seeing your contributions impact lives around the world. Join Visa and do work that matters - to you, to your community, and to the world. Progress starts with you.

Job Description

As a Junior Software Engineer, you'll learn and contribute to building services and tooling that help product teams deliver real-time features. This is a hands-on role where you'll write code, pair with experienced engineers, participate in code reviews, and follow best practices for reliable, scalable, and observable systems. You'll have support from mentors and your squad to grow quickly.

This role sits within Visa's Treasury function, which is responsible for managing global liquidity, cash flow, and risk to keep payments moving smoothly across markets. Treasury ensures funds are available where needed and supports critical processes like settlements and foreign exchange. As part of this team, you'll help build reliable, scalable systems that underpin these operations and enable real-time visibility and control.

Our stack runs on AWS as a set of distributed applications using Kubernetes and a microservice-led architecture. We are also utilising Kafka for our streaming and PACT for Contract testing.

What you'll get to do:

• Write and maintain backend code in Java (11+) and Spring Boot on real services with guidance from senior engineers.
• Contribute small features and tests to services that integrate with Kafka, Flink, and related technologies.
• Add observability (metrics, logs, traces) and improve reliability under the supervision of the team.
• Help refine requirements, demo your work, and deliver incrementally in Agile squads.
• Participate in code reviews, documentation, and CI/CD pipelines.
• Learn and apply event-driven patterns in practical, production contexts.

You'll get:

• Ownership of well-defined tasks and components within the treasury domain, with mentorship and clear growth paths.
• Exposure to modern technologies and production practices.
• A modern tech stack and the autonomy to try ideas, supported by your squad.
• Strong organisational support, visibility, and opportunities to learn.

Our Tech Stack includes:

• Object-oriented programming forms the bulk of our codebase, currently in Java, versions 11+, and ideally Spring Boot framework.
• Highly-scalable, highly-available, cloud-native applications on AWS are key to our next phase of growth, are written to 12-factor principles and fit into our microservices architecture.
• Cloud-related tools, services, and distributed system observability to support these applications, such as Docker, Kubernetes, ElasticSearch, log management systems, and Datadog APM, to name but a few.
• API specifications, conforming to the OpenAPI (Swagger) standard, provide a clean boundary both externally between our customers and our product, and internally between our microservices.
• SQL, and large SQL databases, provide the persistence layer for our applications. You'll be working with (and know the limitations of using) such large datastores.
• Infrastructure automation is primarily owned by the infrastructure team, but you will be a consumer of their work; familiarity with AWS, Terraform and Docker is beneficial.
• Testing approaches, including TDD, BDD and Contract Testing, all form an important part of our approach to quality assurance, ensuring that the code that we write forms products that are fit for use. We currently use a variety of frameworks including JUnit, RSpec and Cucumber.
• Agile development, with teams broadly aligned with the Spotify - Squads and Tribes - model, helps us deliver incremental improvements to our products in an iterative manner. Advocating this model, and joining us on a journey of continuous improvement, is a key attribute of members of our teams.
• Continuous Integration and Continuous Delivery pipelines allow us to automate-all-the-things, providing repeatable builds and consistent deployments.
• GitHub, and the GitHub PR review process, forms a core part of our developer workflow, and peer reviews help share knowledge and improve quality.
• Teamwork, and cross-team collaboration, is fundamental to the delivery of our applications. Whilst each application has an independent path to production, there will always be some activities and initiatives that span multiple teams and require cross-team collaboration. Within your team you'll need to collaborate with a number of stakeholders, including Product Owners and QA, as part of your product development.

This is a hybrid position. Expectation of days in office will be confirmed by your Hiring Manager. Visa requires at least 3 days in office, expectations of these days will be confirmed by your Hiring Manager.

Qualifications

Basic Qualifications: Bachelor's degree (or final year student) in Computer Science or related field, or equivalent practical experience (projects, internships, open-source). No professional experience required but you must demonstrate interest and learning initiative.

Preferred Qualifications: Coursework, projects, internships, or open-source contributions in Java and Spring Boot. Skills with functional Java (versions 8+) and Spring (ideally Spring Boot). Agile ways of working such as Scrum or Kanban in cross-functional teams. Knowledge of Docker, EKS, AWS (public cloud) and Kafka. Clear, structured communication, ability to explain your solutions and ask good questions. Interest in cloud-native practices: high availability, scalability, CI/CD, testing automation, and observability. Experience writing tests (JUnit, Cucumber, or similar) in project work. Curiosity about DevOps and 'you build it, you run it' culture. Evidence of well-tested, performant solutions in projects (benchmarks, unit/integration tests). A self-starter mindset - examples of initiatives you've driven (capstone project, hackathon, club leadership, personal repo). Pragmatic approach to problem solving and collaboration. Comfortable challenging the status quo respectfully and learning how complex systems work. Strong written and verbal communication. Comfortable working in a fast-moving environment and as part of a wider team.

Visa is an EEO Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability or protected veteran status. Visa will also consider for employment qualified applicants with criminal histories in a manner consistent with EEOC guidelines and applicable local law.