Senior Software Engineer

Eliassen Group; St. Louis (MO); Hybrid; USD 117,000 - 131,000; Part time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401k with company matching

Life insurance

Job summary

Eliassen Group in Saint Louis, MO is seeking a hands-on Senior Software Engineer to modernize and maintain a mission-critical enterprise application in AWS GovCloud. The role emphasizes practical engineering, reliability, and collaboration with architects and scrum teams to deliver scalable microservices and micro-frontend solutions.

The position is hybrid with 4 days in office and requires W2 basis employment.

Qualifications

• 5+ years of hands-on software engineering experience.
• Advanced proficiency with Java and the Spring Boot ecosystem.
• Experience with AWS Cloud services such as ECS or EKS, Lambda, and RDS or Aurora, and IaC tools like CDK or CloudFormation.
• Experience with Angular. Familiarity with micro-frontend architecture using module federation is a plus.
• Background in microservices architecture and modernization patterns such as the strangler pattern.
• Strong technical writing and communication skills.
• Collaborative approach and effective problem solving in cross-functional teams.
• Comfort with AI-enabled tools and willingness to learn and apply emerging technologies. Experience with GitLab CI/CD and Copilot is beneficial.
• Preferred experience with FedRAMP High, FISMA, or similar compliance environments.
• Track record in reducing technical debt through refactoring and automation.

Responsibilities

• Design and implement microservices using Java, Spring Boot, and TypeScript supporting event-driven and RESTful patterns.
• Build solutions on AWS GovCloud services including ECS or EKS, Lambda, EventBridge, and RDS within microservices and micro-frontend architectures.
• Reduce technical debt through dependency and framework upgrades with strong test automation.
• Implement UI test automation and BDD practices to ensure quality.
• Collaborate with enterprise architects and scrum teams to translate architecture into scalable solutions.
• Apply reusable patterns and best practices for architectural consistency.
• Participate in architecture and code reviews and technical discussions aligned with enterprise standards.
• Document designs and decisions with clear technical writing.
• Troubleshoot production issues, optimize performance, and deliver robust features.
• Contribute to both new feature development and ongoing production support in Agile sprints.

Skills

Java

Spring Boot

TypeScript

Angular

RESTful APIs

Event‑driven design

Test automation

AWS GovCloud

Microservices

CI/CD

Tools

ECS

EKS

Lambda

RDS/Aurora

CDK

CloudFormation

OpenSearch

Grafana

CloudWatch

GitLab CI/CD

Copilot

Job description

Senior Software Engineer

St. Louis, MO

Type: Contract

Category: Development

Industry: Financial Services

Reference ID: JN -082026-108318

Date Posted: 08/18/2026

Shortcut: http://careers.eliassen.com/0VoYD2

Description:

Hybrid 4 days in office in St. Louis, MO

Our client seeks a hands‑on Senior Software Engineer to modernize and maintain a mission‑critical enterprise application in AWS GovCloud. The role focuses on practical engineering, reliability, and collaboration with architects and scrum teams to deliver scalable microservices and micro‑frontend solutions.

Due to client requirements, applicants must be willing and able to work on a w2 basis. For our w2 consultants, we offer a great benefits package that includes Medical, Dental, and Vision benefits, 401k with company matching, and life insurance.

Rate: $85.00 to $95.00/hr. w2

• medical (choice of 3 plans), dental, vision, pre-tax accounts, other voluntary benefits including life and disability insurance, 401(k) with match, and sick time if required by law in the worked‑in state/locality.

Responsibilities:

• Design and implement microservices using Java, Spring Boot, and TypeScript supporting event‑driven and RESTful patterns.
• Build solutions on AWS GovCloud services including ECS or EKS, Lambda, EventBridge, and RDS within microservices and micro‑frontend architectures.
• Reduce technical debt through dependency and framework upgrades with strong test automation.
• Implement UI test automation and BDD practices to ensure quality.
• Collaborate with enterprise architects and scrum teams to translate architecture into scalable solutions.
• Apply reusable patterns and best practices for architectural consistency.
• Participate in architecture and code reviews and technical discussions aligned with enterprise standards.
• Document designs and decisions with clear technical writing.
• Troubleshoot production issues, optimize performance, and deliver robust features.
• Contribute to both new feature development and ongoing production support in Agile sprints.

Experience Requirements:

• 5+ years of hands‑on software engineering experience.
• Advanced proficiency with Java and the Spring Boot ecosystem.
• Experience with AWS Cloud services such as ECS or EKS, Lambda, and RDS or Aurora, and IaC tools like CDK or CloudFormation.
• Experience with Angular. Familiarity with micro‑frontend architecture using module federation is a plus.
• Background in microservices architecture and modernization patterns such as the strangler pattern.
• Strong technical writing and communication skills.
• Collaborative approach and effective problem solving in cross‑functional teams.
• Comfort with AI‑enabled tools and willingness to learn and apply emerging technologies. Experience with GitLab CI/CD and Copilot is beneficial.
• Preferred experience with FedRAMP High, FISMA, or similar compliance environments.
• Track record in reducing technical debt through refactoring and automation.
• Familiarity with CI/CD, artifact management, and security scanning.
• Familiarity with observability tools such as CloudWatch, Grafana, and OpenSearch.