Senior Software Engineer

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

JN -082026-108318

• 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.

• 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.

Recruitment Transparency Notice

Eliassen Group values transparency in our recruitment practices. Please be advised that Eliassen Group utilizes artificial intelligence (AI) tools as part of its initial application screening  and hiring process. You may receive email and SMS notifications from the Eliassen Virtual Recruiting Team ( View email address on us.fitly.work , View phone number on us.fitly.work) inviting you to complete a brief voice screening as part of your application process. These tools assist our hiring teams in different ways, including but not limited to, assistance in reviewing application materials to help identify candidates whose qualifications most closely match the requirements of the position. All AI-assisted evaluations and responses are reviewed by human recruiters before any hiring decisions are made. The use of AI in our process is intended to support fairness, efficiency, and consistency, and Eliassen Group takes measures to prevent bias or discrimination in connection with its hiring practices. By proceeding, you acknowledge, agree, and consent to Eliassen Group’s use of these tools, including AI tools, as part of the application and hiring process.

Skills, experience, and other compensable factors will be considered when determining pay rate. The pay range provided in this posting reflects a W2 hourly rate; other employment options may be available that may result in pay outside of the provided range.

· When you work with Eliassen Group, all email communication will come from an Eliassen.com address, never Gmail, Yahoo, etc.

· Eliassen Group will never ask you for personal information (home address, bank account, or check routing number) until you have worked with someone clearly associated with Eliassen Group.

If you have any indication of fraudulent activity, please contact View email address on us.fitly.work .

About Eliassen Group:

Eliassen Group is a strategic consulting firm that helps organizations reach further and achieve more through our technology, business advisory, and life sciences solutions. For nearly 40 years, we have combined exceptional people, deep domain expertise, and intelligent capabilities to expand our clients’ capacity and accelerate meaningful outcomes. We are driven by a purpose to positively impact the lives of our employees, clients, consultants, and the communities we serve.

Eliassen is committed to building a diverse and inclusive team from a variety of backgrounds, perspectives, and skills. We are an Equal Opportunity and Affirmative Action Employer and all employment decisions are based on merit, performance, and business needs. Eliassen does not discriminate on the basis of race, color, gender identity or expression, sexual preference or orientation, sex (including pregnancy, childbirth, and related medical conditions), marital status, creed, religion, physical or mental disability, genetic information, military or veteran status, age, ancestry, national origin, citizenship status, prohibited criminal record inquiries of applicants and employees, or any other category protected by federal, state, or local laws.

Don’t miss out on our referral program! If we hire a candidate that you refer us to then you can be eligible for a $1,000 referral check!