Java Architect

Apexon; St. Louis (MO); On-site; USD 150,000 - 190,000; Full time

Job summary

Apexon in St. Louis, MO is seeking a hands-on Java Architect with deep expertise in Java, Spring Boot, microservices, React and TypeScript to design and build scalable, secure enterprise apps.

You will lead architecture, drive API-first designs, oversee backend and frontend teams, and mentor engineers while delivering high-performance, resilient systems. Ideal candidates bring 10+ years software experience and strong enterprise architecture.

Qualifications

• 10+ years in software engineering with large-scale systems.
• 7+ years hands-on Java/Spring development.
• 5+ years API and microservices architecture.
• 3+ years React and TypeScript development.
• Strong enterprise architecture and leadership skills.

Responsibilities

• Lead architecture, design, and development of enterprise applications.
• Drive API-first, microservices, distributed systems, and event-driven architectures.
• Provide technical leadership across backend and frontend teams.
• Design and develop scalable backend services with Java 17/21 and Spring Boot.
• Build REST APIs, integrations, messaging, and asynchronous services.
• Lead frontend architecture using React and TypeScript.
• Ensure performance, scalability, availability, accessibility, and security.
• Participate in architecture reviews, production readiness, troubleshooting.
• Drive security-by-design and cloud transformation initiatives.
• Support modernization and cloud transformation efforts.

Skills

Java

Spring Boot

Microservices

React

TypeScript

API Design

Security

Distributed Systems

Cloud Transformation

Tools

OpenAPI/Swagger

PostgreSQL

OAuth2

JWT/OIDC

REST API

JUnit

Mockito

REST Assured

Job description

We are seeking a Java Architect with strong expertise in Java, Spring Boot, Microservices, React, and TypeScript. The ideal candidate will be hands-on, architecture-focused, and experienced in building scalable, secure, enterprise-grade applications.

Key Responsibilities

• Lead architecture, design, and development of enterprise applications.
• Drive API-first, microservices, distributed systems, and event-driven architectures.
• Provide technical leadership across backend and frontend development teams.
• Design and develop scalable backend services using Java 17/21 and Spring Boot.
• Build REST APIs, integrations, messaging, and asynchronous services.
• Lead frontend architecture and development using React and TypeScript.
• Ensure applications meet performance, scalability, availability, accessibility, and security standards.
• Participate in architecture/design reviews, production readiness, troubleshooting, and root-cause analysis.
• Drive security-by-design, secure coding, threat modeling, and compliance initiatives.
• Support application modernization and cloud transformation initiatives.

Technical Skills

Backend: Java 17/21, Spring Boot, Spring Security, Hibernate/JPA, PostgreSQL, REST APIs, OpenAPI/Swagger, OAuth2, JWT, OIDC

Testing: JUnit, Mockito, REST Assured, performance testing

Required Qualifications

• 10+ years of overall software engineering experience.
• 7+ years of hands-on Java/Spring development.
• 5+ years with API and microservices architecture.
• 3+ years of React and TypeScript development.
• Strong enterprise architecture and distributed systems experience.
• Experience with application modernization and cloud transformation.
• Proven technical leadership across geographically distributed teams.
• Strong understanding of secure, scalable, and highly available systems.
• Excellent communication, problem-solving, and leadership skills.

Ideal Candidate

A hands-on technical leader who can make architecture-level decisions, guide distributed engineering teams, and actively contribute to development, troubleshooting, and modernization initiatives.