Senior Mainframe Developer Jobs in Missouri

Senior Developer, Full Stack - Contract

Location: St. Louis, MO

Why WWT?

At World Wide Technology, we work together to make a new world happen. Our important work benefits our clients and partners as much as it does our people and communities across the globe. WWT is dedicated to achieving its mission of creating a profitable growth company that is also a Great Place to Work for All. We achieve this through our world-class culture, generous benefits and by delivering cutting-edge technology solutions for our clients.

Founded in 1990, WWT is a global technology solutions provider leading the AI and Digital Revolution. WWT combines the power of strategy, execution and partnership to accelerate digital transformational outcomes for organizations around the globe. Through its Advanced Technology Center, a collaborative ecosystem of the world's most advanced hardware and software solutions, WWT helps clients and partners conceptualize, test and validate innovative technology solutions for the best business outcomes and then deploys them at scale through its global warehousing, distribution and integration capabilities.

With over 14,000 employees across WWT and Softchoice and more than 60 locations around the world, WWT's culture, built on a set of core values and established leadership philosophies, has been recognized 15 years in a row by Fortune and Great Place to Work® for its unique blend of determination, innovation and creating a great place to work for all.

Want to work with highly motivated individuals on high-performance teams? Join WWT today!

Why Join the Internal IT Team?

The Internal WWT IT team serves as the backbone of the company's technology ecosystem. We design, build, and operate the platforms that power WWT's internal applications and engineering teams across the enterprise. Our work enables secure, scalable, and highly automated delivery of software and services that directly support the company's strategic objectives.

Joining this team means working on foundational technology that matters; shared platforms, developer tooling, and automation that WWT depends on every day. You'll be part of a collaborative, forward-looking engineering and development culture where ownership, innovation, and continuous improvement are expected and encouraged.

Why Join the INFOPS Application Development Team?

The INFOPS Application Development team delivers and supports on-prem and cloud platforms that power our custom application development organization. These highly available platforms support internal users and external customers around the globe. Our team operates in a fast-paced, collaborative environment, emphasizing Platform Engineering best practices, Infrastructure as Code, GitOps, and automation. As the organization continues to mature, the team is also evolving toward AI-native engineering, incorporating intelligent automation and AI-assisted workflows to reduce operational toil, improve reliability, and accelerate delivery across the software development lifecycle. The team partners with stakeholders to provide secure, reliable, and high-performing platforms that are simple to consume.

We are seeking a Senior Developer to join a talented group of developers and engineers who share a passion for technology, continuous learning, and delivering enterprise-grade solutions. The ideal candidate has 5+ years of full-stack development experience, brings deep expertise in Node.js and Vue.js, and thrives on leveraging AI coding tools to accelerate productivity and quality. You are a collaborative leader who enjoys owning end-to-end solutions and mentoring teammates. Your first project will involve working with Platform Engineers to develop applications for an AI Native Engineering initiative within the organization.

Responsibilities:

Full Stack Development

• Design and build end-to-end full-stack applications using Node.js on the backend and Vue.js on the frontend, delivering cohesive, production-ready features from database to UI.
• Develop scalable REST/GraphQL APIs and microservices that integrate with platform technologies such as Apache Solr, MongoDB, PostgreSQL, Oracle, and RabbitMQ deployed on Kubernetes.
• Build and maintain internal libraries and SDKs that simplify consumption of platform services, and refactor existing applications for efficiency, reliability, and maintainability.
• Lead architecture decisions for new features, ensuring solutions align with Twelve-Factor App principles and WWT best practices.

AI-Assisted & Agentic Engineering

• This role requires comfort working alongside AI-powered tools while maintaining strong engineering judgment, validation, and accountability for outcomes.
• Sr Developers will contribute to the adoption and continuous improvement of AI-enabled workflows by providing feedback, identifying opportunities for automation, and safely incorporating AI assistance into repeatable operational patterns.
• This includes leveraging approved AI tools and agents to assist with platform operations, troubleshooting, automation, documentation, and workflow efficiency under established governance and best practices.
• Sr Developers on the INFOPS Application Development team are expected to actively use and support AI-assisted and agentic engineering workflows as part of their day-to-day work.
• Develop agent-to-agent (A2A) AI workflows or applications.
• Design, implement, and maintain MCP (Model Context Protocol) servers that expose enterprise data and capabilities to AI agents and LLM-powered workflows.

CI/CD & DevOps

• Own and evolve CI/CD pipelines using GitHub, Jenkins, and Codefresh, from commit hooks through automated testing and production deployment.
• Develop and maintain deployment orchestration tools and automation workflows on Kubernetes-based platforms (including OpenShift).
• Drive DevOps improvements: infrastructure-as-code, automated testing, deployment reliability, and monitoring with Prometheus and Grafana.
• Participate in on-call rotation, monthly maintenance windows, and platform lifecycle tasks to ensure platform reliability.

Leadership & Collaboration

• Mentor mid-level and junior developers, conducting code reviews and sharing architectural knowledge to elevate team capability.
• Work with customers and stakeholders to understand integration needs and translate business requirements into robust engineering solutions.
• Collaborate with partner engineering teams to drive efficiencies across the organization and contribute to WWT best practices.
• Maintain strong documentation and actively contribute to team knowledge sharing.
• Work effectively in a fast-paced environment with shifting priorities, balancing support work, ad hoc requests, and project deliverables.

REQUIRED QUALIFICATIONS:

• Bachelor's degree in Computer Science, MIS, or related field, or equivalent experience
• 5+ years of professional development experience with a strong full-stack focus
• 5+ years of experience with JavaScript and Node.js, building production APIs, services, and microservices
• 3+ years of experience with Vue.js; component design, state management (Pinia/Vuex), and frontend architecture.
• Hands-on experience using AI coding tools (Claude, GitHub Copilot, M365 Copilot, Windsurf) in a professional engineering context
• Experience building or integrating with MCP (Model Context Protocol) servers or similar AI agent integration patterns
• CI/CD and DevOps experience: pipeline authoring, automated testing, deployment automation (GitHub Actions, Jenkins, Codefresh, or equivalent)
• Experience with GitHub, Docker, and Kubernetes
• Experience with Linux/Unix and shell scripting
• Familiarity with microservices, Twelve-Factor App principles, and cloud-native development
• Strong test-first mindset with experience in unit, integration, and end-to-end testing
• Ability to analyze requirements and communicate effectively, both verbally and in writing
• Team-oriented with strong work ethic, collaboration skills, and the ability to mentor others
• Strong problem-solving, change management, and technical planning abilities

PREFERRED QUALIFICATIONS:

• Experience with Java, Grails, Python, or Go
• Experience with React frontend development
• Experience with IDP concepts and platforms like Backstage
• REST API design and implementation, including OpenAPI/Swagger documentation, API gateway and routing patterns
• Familiarity with secure, minimal containers: Minimus, Docker Hardened Images, etc.
• Kubernetes-based platforms such as OpenShift
• Cloud providers, especially Azure
• Databases: MongoDB, Oracle, PostgreSQL
• Messaging, search, and caching tools: RabbitMQ, Apache Solr, Redis
• Containers and automation tools: Docker, Ansible
• Monitoring tools: Prometheus, Grafana, Splunk
• Prior experience designing AI-driven internal tooling or copilot integrations

Required Location: St. Louis, MO

Certain states and localities require employers to post a reasonable estimate of salary range. A reasonable estimate of the current base pay range for this position is $51 per hour to $64 per hour. Actual salary will be based on a variety of factors, including shift, location, experience, skill set, performance, licensure and certification, and business needs. The range for this position in other geographic locations may differ. Certain positions may also be eligible for variable incentive compensation, such as bonuses or commissions, that is not included in the base pay.

We strive to create an environment where all employees are empowered to succeed based on their skills, performance, and dedication. Our goal is to cultivate a culture of belonging that encourages innovation, collaboration, and respect for all team members, ensuring that WWT remains a great place to work for All!

If you have any questions or concerns about this posting, please email taposting@wwt.com.