# Senior Software Engineer

**Company**: Mastercard
**Location**: O'Fallon, Missouri
**Experience**: senior
**Job type**: full-time
**Salary**: $115,000 - $184,000 USD
**Category**: Engineering
**Industry**: Technology

**Apply**: https://mastercard.wd1.myworkdayjobs.com/en-US/CorporateCareers/job/OFallon-Missouri/Senior-Software-Engineer_R-289666?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply
**Canonical**: https://yubhub.co/jobs/job_ecbec43a-427

## Description

Mastercard is seeking a Senior Software Engineer to design, build, and enhance software applications and developer-facing experiences that empower engineers across Mastercard's software delivery ecosystem.

**Software Development**

- Design, develop, test, and support scalable cloud-native applications and services

- Build and maintain backend solutions using Java and Spring Boot

- Develop and enhance modern user interfaces using React and TypeScript

- Design and implement REST APIs and service integrations across the Developer Experience ecosystem

- Build integrations with developer tools including Jenkins, GitHub, Bitbucket, SonarQube, Workday, and related engineering platforms

- Contribute to internal developer portals using Backstage or similar frameworks

- Help improve engineering productivity through automation, self-service capabilities, and platform standardization

**Software Development Excellence**

- Own delivery of robust, secure, and high-performance software across backend platforms and frontend applications (React, TypeScript)

- Drive engineering excellence in coding standards, modular design, and maintainability

- Design and develop software solutions that improve developer productivity and streamline software delivery workflows using Backstage or similar frameworks and extensible plugin-based architectures.

- Build modern, data-driven user experiences that transform engineering and operational data into actionable insights for software development teams.

**Testing Strategy & Quality Engineering**

- Define and implement comprehensive testing strategies, including:

- Unit testing

- Integration testing

- Functional/end-to-end testing

- Embed automated testing within CI/CD pipelines to enforce quality gates and prevent regressions

- Ensure systems meet correctness, reliability, and backward compatibility requirements at scale

**Performance Engineering**

- Lead performance engineering initiatives, including system benchmarking, load testing, and capacity planning

- Analyze application and service performance, optimize system responsiveness, and improve scalability across highly distributed software systems.

- Ensure applications meet strict performance SLAs in high-volume, mission-critical environments

**Secure Coding & Compliance**

- Enforce secure coding practices and integrate security into every phase of the SDLC

- Design systems that meet enterprise security, regulatory, and compliance requirements

- Partner with security teams to proactively identify and remediate vulnerabilities

**Troubleshooting & Incident Management**

- Serve as a senior technical leader for complex software production issues, leveraging deep troubleshooting expertise across distributed applications, APIs, integrations, and user-facing systems.

- Lead root cause analysis, incident resolution, and postmortem activities

- Drive systemic improvements to prevent recurring issues and improve system reliability

**Code Review & Technical Leadership**

- Lead rigorous code reviews, ensuring adherence to best practices in design, performance, security, and maintainability

- Mentor engineers and elevate team capability in software design, testing, debugging, and operational excellence

- Provide hands-on guidance in solving high-complexity technical problems across system layers

**Collaboration & Ownership**

- Partner with product, platform, and business stakeholders to shape technical roadmaps and delivery priorities

- Own and deliver cross-functional software engineering initiatives spanning frontend applications, backend services, APIs, integrations, and cloud-native architectures.

- Contribute to the Software Engineering Guild by sharing reusable frameworks, patterns, and innovations

## Skills

### Required
- Java
- Spring Boot
- React
- TypeScript
- REST APIs
- Jenkins
- GitHub
- Bitbucket
- SonarQube
- Workday
- Backstage
- AWS
- Kubernetes
- containerized architectures
- CI/CD pipelines
- Infrastructure as Code
- Terraform
- CloudFormation
- Splunk

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Source: [Apply at mastercard.wd1.myworkdayjobs.com](https://mastercard.wd1.myworkdayjobs.com/en-US/CorporateCareers/job/OFallon-Missouri/Senior-Software-Engineer_R-289666?utm_source=yubhub.co&utm_medium=jobs_feed&utm_campaign=apply)