Senior Full Stack Java - W2 Contract

Position: Senior Full Stack Java

Location: St. Louis, MO (3 DAYS ONSITE MANDATORY)

CONTRACT

Job Description:

We are seeking an experienced Technical Lead to lead the design, development, deployment, and support of Mastercard's Decision Management Platform (DMP) and FlexTP transaction processing ecosystem. The ideal candidate will provide technical leadership across high-volume, real-time transaction processing systems, driving architecture decisions, engineering excellence, operational stability, and delivery execution across globally distributed teams.

This role requires strong expertise in enterprise Java applications, distributed systems, CI/CD, cloud-native deployments, database technologies, production support, and agile delivery practices. Experience with payment authorization, fraud detection, transaction routing, or mission-critical financial platforms is highly desirable.

Preferred Experience

• Payments, Financial Services, Fraud Detection, or Card Processing domain experience.
• Experience with large-scale transaction processing environments handling millions of transactions.
• Knowledge of AI/ML-based fraud detection systems and decisioning platforms.
• Experience leading globally distributed engineering teams.

Leadership Expectations

• Lead a team of 6-7 engineers and provide technical direction.
• Champion best practices in software engineering, testing, security Vulnerability fix and DevOps.
• Conduct architecture reviews, design reviews, and code reviews.
• Identify risks and drive mitigation strategies.
• Foster a culture of innovation, collaboration, and continuous improvement.
• Build strong partnerships with product, business, operations, and platform teams.
• Drive technical decision-making for large-scale enterprise initiatives.

Key Responsibilities

• Lead the architecture, design, and development of scalable solutions within DMP and FlexTP platforms.
• Provide technical leadership and mentorship to software engineers and quality engineers.
• Drive modernization initiatives involving microservices, APIs, cloud-native applications, and distributed systems.
• Own end-to-end delivery from requirements analysis through development, testing, deployment, and production support.
• Review application architecture, design patterns, and code quality to ensure adherence to engineering standards.
• Manage application deployments across DEV, STAGE, ITF, PEAT, MTF, and Production environments.
• Lead troubleshooting efforts for critical production incidents and performance issues.
• Drive observability, monitoring, and operational excellence using enterprise monitoring platforms.
• Guide release planning, deployment automation, environment management, and configuration governance.

Required Technical Skills & Tools Knowledge

Programming & Development

• Java (In depth knowledge JDK8 onwards) programming language
• Production Issue fix experience
• Security Vulnerability fix experience ( Checkmark, Blackduck, Infra Vulnerability fix knowledge)
• Batch Job, Shell script , Unix command – Application Production Support
• Oracle Database and SQL programming language
• REST APIs
• gRPC Services
• Microservices Architecture
• Middleware - Kafka
• Knowledge of Certificate ( . JKS, .P12, Encryption, Public Key, Private Key) , MTLS, TLS1.3

DevOps & CI/CD Tools

• Jenkins Jobs
• PCF (Pivotal Cloud Foundry)
• XLR (Release Automation) good to have
• Maven
• Git , Bitbucket/Stash
• JFrog Artifactory
• Docker
• SonarQube
• Cloud & Infrastructure
• HashiCorp Vault
• CyberArk
• Chef Habitat

Monitoring & Observability

• Splunk