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Posted August 11, 2026

Senior Software Developer

Eliassen Group
Saint Louis, MO, US Full Time

Job Description

Job Description
Description:

Hybrid 2-3 days on-site in St. Louis, MO

Our client seeks a Senior Software Developer to support modernization and maintenance of a mission-critical enterprise application in AWS for the U.S. Treasury. The role requires full-stack development across Java/Spring Boot services and Angular/TypeScript front ends, with emphasis on security remediation, cloud-native patterns, and application upgrades. You will collaborate across scrum teams, align with enterprise architecture, and contribute reusable patterns and robust test automation.

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: $100.00 to $125.00/hr. w2

Responsibilities:
  • Design and implement microservices using Java/Spring Boot and TypeScript for event-driven and RESTful integrations.
  • Upgrade and modernize Angular applications and support micro-frontend approaches.
  • Build cloud solutions using AWS services including ECS/EKS, Lambda, EventBridge, and RDS.
  • Remediate technical debt by upgrading dependencies and frameworks.
  • Ensure comprehensive test automation and maintain technical documentation.
  • Implement security best practices aligned to FRB System and U.S. Treasury guidelines, including vulnerability scanning and remediation.
  • Coordinate with DevOps, InfoSec, Program Management, and multiple scrum teams.
  • Communicate status, risks, and blockers to stakeholders.
Experience Requirements:
  • 5+ years of software engineering experience.
  • Proven AWS experience with ECS/EKS, Lambda, RDS/Aurora, and infrastructure as code with CDK or CloudFormation.
  • Strong Java, Spring Boot, Spring Cloud, and Hibernate experience, with Tomcat exposure.
  • Strong Angular and TypeScript experience. Micro-frontend architecture experience is a plus.
  • Microservices architecture experience, including use of the strangler pattern for legacy modernization.
  • Experience with observability tools such as CloudWatch, Grafana, and OpenSearch.
  • Experience with test automation and development accelerators is preferred.
  • Proven technical leadership with cross-team collaboration.
  • U.S. citizenship required for a FedRAMP High environment.
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 ([email protected], 781-808-2924) 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.W2 employees of Eliassen Group who are regularly scheduled to work 30 or more hours per week are eligible for the following benefits: 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.If anyone reaches out to you about an open position connected with Eliassen Group, please ensure that you are working directly with us by confirming the following:

· 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 [email protected].

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!

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