Java Full Stack Developer / Consultant

Argyllinfotech (Missouri, USA) Follow 6 hours ago

Java Full Stack Developer / Consultant

Location: St. Louis, MO (Hybrid-Onsite)
Duration: 12 Months Contract
Target Start Date: June 23, 2026

Visa Requirement: Visa-Independent Candidates Only
Interview Process: Virtual Interview followed by Face-to-Face (if required)

Position Overview

We are seeking a highly motivated and experienced Java Full Stack Developer to join a fast-paced enterprise application development team supporting Mastercard Send initiatives. The ideal candidate will have strong backend development expertise with Java, Spring Boot, Microservices, Cloud Technologies, and API Security, along with frontend development experience using Angular.

This role involves designing, developing, securing, and maintaining highly available and scalable applications while ensuring performance, observability, resiliency, and compliance with enterprise standards.

Key Responsibilities

Analyze, design, develop, and deliver secure, scalable software solutions.
Develop, customize, test, and integrate applications according to Mastercard specifications and standards.
Design and implement microservices-based architectures using Java and Spring technologies.
Build and maintain RESTful APIs, backend services, and frontend applications.
Ensure application reliability through resilience patterns such as retries, circuit breakers, graceful degradation, and fault recovery mechanisms.
Implement observability and monitoring solutions using OpenTelemetry, Dynatrace, Micrometer, and logging frameworks.
Design cloud-ready and scalable applications for PCF and Azure environments.
Ensure security best practices, including encryption, secrets management, API security, authentication, and authorization.
Participate in system testing, performance benchmarking, release planning, deployment activities, and production support.
Collaborate with geographically distributed teams in an Agile development environment.
Contribute to architecture discussions, technical documentation, and continuous improvement initiatives.

Required Technical Skills

Backend Development

Java
Spring Boot
Spring Batch
Object-Oriented Design (OOD)
Design Patterns
Microservices Architecture
RESTful APIs
JSON & Web Services

Cloud & Platform Technologies

Azure Cloud Platform
PCF (Pivotal Cloud Foundry)
Docker & Containerization
Apache Tomcat / HTTP Server

Data & Messaging

Oracle Database
Redis
Apache Kafka
Messaging Systems

Spring Ecosystem

Spring Cloud Gateway
Spring Cloud Config
Resilience4j (Retry, Circuit Breaker)

Observability & Monitoring

OpenTelemetry
Dynatrace
Micrometer
Log4j
Splunk

Security & Cryptography

AES/RSA Encryption
TLS/PKI
OAuth2
JWT
Mutual TLS (mTLS)
HSM / Azure Key Vault
Secure Key Management

Testing & DevOps

JUnit
Mockito
Karate
Automated Testing Frameworks
Maven
Jenkins
GitHub
CI/CD Pipelines

Frontend Development

Angular
JavaScript Frameworks
HTML5
CSS3

Required Qualifications

3 8+ years of software development experience.
Strong experience delivering secure solutions within Financial Services, Banking, Payments, or related industries.
Hands-on experience developing enterprise-scale distributed systems.
Excellent understanding of application security, resiliency, performance optimization, and cloud-native development.
Strong analytical, problem-solving, and communication skills.
Ability to work independently and collaboratively within matrixed and geographically distributed teams.
Self-motivated with a strong sense of ownership and accountability.

Preferred Candidate Profile

High-energy, detail-oriented professional with a proactive mindset.
Strong verbal and written communication skills.
Ability to manage multiple priorities in a fast-paced environment.
Passion for innovation, continuous learning, and technical excellence.

Top 3 Responsibilities

Design, develop, and maintain secure, scalable Java-based microservices and full-stack applications.
Implement cloud-native solutions with strong focus on resiliency, observability, performance, and security.
Support application lifecycle activities including testing, deployment, monitoring, and continuous improvement.

Additional Information

Experience in Payments, Financial Services, or Banking domains is highly preferred.
Drug screening and background verification requirements apply as per client policies.

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