Java Engineer – St Louis, MO (Hybrid, 3 days onsite/week)

Tech Mirrors; St. Louis (MO); Hybrid; USD 45,000 - 76,000; Full time

Job summary

Tech Mirrors is seeking a Java Engineer in St. Louis, MO. This hybrid role requires three days onsite weekly and involves long-term contract work. You will work with microservices, Postgres, and Azure, delivering robust backend systems.

Bring 5–12 years of hands-on Java experience, REST/SOAP, Spring Boot, Hibernate/JPA, and API Gateway expertise. Familiarity with Angular and frontend tech is a plus. Strong problem-solving and agile collaboration are essential.

Qualifications

• Hands-on in Java, J2EE, Postgres, REST/SOAP, Spring Boot/MVC, Hibernate/JPA.
• Experience in design of software solutions using architecture principles.
• Payment domain knowledge and ability to drive integrations and migrations.
• Frontend exposure with Angular/JS technologies is a plus.

Responsibilities

• Design and implement microservices with Java and Spring stack.
• Collaborate on integrations, migrations, and architecture decisions.
• Drive API testing and contract testing practices.
• Mentor teammates and contribute to SDLC improvements.

Skills

Java

J2EE

Spring Boot

Spring MVC

Hibernate/JPA

REST

SOAP

Microservices

PostgreSQL

Azure

API Gateway

Security

Tools

Docker

Kubernetes

PCF

Splunk

Jenkins

Git

SonarQube

Swagger

Postman

Job description

Role – Java Engineer

Location – St Louis, MO (Hybrid, 3 days onsite/week)

Long Term Contract

Max Rate – 55/hr on C2C MAX

Mandatory – Microservices, Postgres, Azure

Requirements

Good hands-on in Java, J2EE, Databases (Postgres), Web Services (REST, SOAP), Spring boot, Spring MVC, Spring 4.0, Hibernate/JPA, API Gateway, Azure and Microservices.

5-12 years of experience desired in designing software solutions using software architecture design principles.

Payment domain expertise and ability to drive the team, integrations, migrations, create approach.

Good to have experience in Angular, and front-end technologies.

Understanding of Kafka, PCF, Integration patterns, Security standards, Concurrency and Multi-threading, Collections,PostgreSQL, Azure, Docker, Kubernetes

Hands-on, high-energy, detail-oriented, proactive, and able to function independently under pressure.

Strong Problem-Solving skills.

Distributed systems (Databases, caches, microservices, message broker)

API and Contract Testing using REST Assured/Postman/Swagger/SOAP UI + Groovy/Spring Cloud Contract

Test Driven Development TDD Methodology and Unit Testing using Junit/XCTest

Use of mocking frameworks such as API Service Virtualization/Mockito/OCMock

Static Code Analysis using SonarQube/Xcode Static Analyzer

Hands on with Jenkins/PCF or similar tools for automated provisioning of build and test infrastructure.

Troubleshooting with Splunk, API aids like Swagger/Postman and source control systems like Git

Intermediate knowledge of Maven, Junit, Redis, Oracle database, SQL, Unix command, Shell scripting.

Good to have exposure to Financial/Banking Domain, Frontend development,JavaScript, HTML5, CSS3, Bootstrap/Material UI, Angular.

Good knowledge of tools like Sonar, Data-dog/Dynatrace, GIT, SVN, Rally/Jira, CI (Jenkin / Bamboo)/CD, Splunk

Strong communication skills — both verbal and written – with strong relationship, collaborative skills, and organizational skills

Proven experience in Agile methodology, SDLC & implementation of Projects, debugging the applications.