Senior Java & AWS Microservices Architect

3Core Systems, Inc; Chicago (IL); Hybrid; USD 120,000 - 155,000; Full time

Job summary

3Core Systems, Inc., a SAP and Success Factors partner, seeks a Lead Java Software Engineer focused on AWS-based microservices. The role is based in Chicago, IL with hybrid onsite participation.

This long-term contract role requires 10+ years of software engineering experience and strong leadership in RESTful API development with Java 21 and Spring Boot. You will design enterprise APIs, lead architecture decisions, and drive secure integrations using OAuth 2.0/JWT while coordinating with

Qualifications

• Extensive experience with Java 21 and Spring Boot for RESTful API development.
• Experience with API gateways and Apigee or similar.
• Proficiency deploying in public clouds (AWS preferred).
• Proven automated testing coverage (JUnit/Mockito).
• Event-driven architectures using streaming services (Kinesis/SQS/SNS/Kafka).
• Knowledge of relational and NoSQL datastores (PostgreSQL/MySQL/Amazon RDS, DynamoDB).
• CI/CD pipelines (Azure DevOps/Jenkins/GoCD).
• Agile/Scrum delivery experience.
• Security: OAuth 2.0, JWT, entitlement-based authorization.

Responsibilities

• Lead the design and development of enterprise-scale REST APIs and microservices using Java 21, Spring Boot, Apigee API Gateway, and AWS cloud services.
• Architect API-first solutions; define service contracts, payload schemas, and OpenAPI specifications.
• Lead solution decomposition by breaking business requirements into technical designs and user stories.
• Guide engineers in secure service-to-service integrations using OAuth 2.0, JWT, and entitlement-based models.
• Serve as the technical lead for complex initiatives, driving architecture decisions and code reviews.
• Collaborate with product owners, UI teams, architects, and partner teams to ensure successful delivery.
• Establish engineering best practices for reliability, scalability, observability, security, and maintainability.
• Drive automated testing, performance/load testing, and production readiness reviews.
• Lead troubleshooting and resolution of complex production issues.
• Create and maintain technical docs and runbooks.
• Drive end-to-end software ownership from design through deployment and support.

Skills

Java 21

Spring Boot

REST APIs

AWS

API Gateway (Apigee)

JUnit

MySQL

ElasticSearch

SQL

OAuth 2.0 / JWT

Azure

Event-Driven Architecture

Kafka / MQ

CI/CD

Security best practices

Leadership / Technical leadership

Education

Bachelor's degree or equivalent in related field

Tools

Apigee

AWS

Azure

Google Cloud Platform

Job description

3Core Systems, Inc., a SAP and Success Factors partner, seeks a Lead Java Software Engineer focused on AWS-based microservices. The role is based in Chicago, IL with hybrid onsite participation.

This long-term contract role requires 10+ years of software engineering experience and strong leadership in RESTful API development with Java 21 and Spring Boot. You will design enterprise APIs, lead architecture decisions, and drive secure integrations using OAuth 2.0/JWT while coordinating with