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Senior Software Developer - Contractor

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: Apex Systems
Contract position
Listed on 2026-07-10
Job specializations:
  • Software Development
    AWS, Cloud Engineer - Software, Java Developer, Backend Developer
Salary/Wage Range or Industry Benchmark: 96432 - 165312 USD Yearly USD 96432.00 165312.00 YEAR
Job Description & How to Apply Below
Position: Senior Software Developer I - Contractor
Location: St. Louis

Sr. Software Developer - AWS/Java/Angular

Job#: 3040919

Quick Overview
  • Location:

    Hybrid (2–3 days onsite preferred) or remote
  • Duration: 12+ month contract (likely extension)
  • Interview Process:
    In-person final interview required
  • Work Authorization: U.S. Citizen required (role supports a secure environment)
  • Compensation:
    Competitive hourly rate (aligned with senior-level AWS engineering expertise)
  • Tech Stack: AWS, Java (Spring Boot), Angular, Type Script, Microservices

We’re seeking a Senior Software Engineer to support the ongoing modernization of a complex, cloud-based enterprise platform. This role is ideal for someone who enjoys working on large-scale systems—balancing new development with stabilization of existing applications.

You’ll collaborate closely with architecture and engineering teams to implement scalable solutions, improve system design, and help drive consistency across services in a distributed environment.

What You’ll Be Doing
  • Design and develop microservices using Java (Spring Boot) and Type Script
  • Build and support RESTful APIs and event-driven integrations
  • Contribute to front-end updates, including Angular upgrades and modular UI architecture
  • Develop solutions in AWS using containerization, serverless compute, and managed data services
  • Identify and reduce technical debt, including framework and dependency upgrades
  • Implement automated testing to improve reliability and release confidence
  • Partner with Dev Ops, security, and product teams to deliver high-quality solutions
Required Qualifications
  • 5+ years of software engineering experience
  • Strong hands‑on experience with AWS (containers, serverless, or infrastructure as code)
  • Expertise in Java/Spring Boot and API development
  • Experience with Angular (modern versions)
  • Background in microservices architecture and system modernization
  • Familiarity with logging, monitoring, and observability tools
  • Strong collaboration and communication skills
Engineering Environment
  • Modern microservices architecture with ongoing legacy modernization
  • Cloud-native development in AWS
  • Strong emphasis on scalability, observability, and maintainability
  • Collaborative, fast-moving engineering teams
Nice to Have
  • Experience with micro-frontend architectures
  • Exposure to developer productivity or platform tools
  • Strong experience with test automation frameworks
What Makes This Role Interesting
  • Long-term modernization initiative (not a short-term patch project)
  • Opportunity to influence architecture and engineering direction
  • Mix of greenfield + legacy transformation work
  • High-impact system with real-world scale
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Position Requirements
10+ Years work experience
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