Senior Software Developer
St. Louis, MO
Category: Development
Industry: Financial Services
Reference ID: JN -072026-107715
Date Posted: 07/31/2026
Shortcut: http://careers.eliassen.com/hydiUJ
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.
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 fraud@eliassen.com.
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Eliassen Group is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected veteran status, or disability status. Eliassen Group’s Affirmative Action Plan (AAP) is available for inspection by any employee or applicant for employment upon request, during normal business hours of Monday through Friday, 8:30am to 5:30pm EST. Interested persons should contact Phaedra Wells at pwells@eliassen.com for assistance. It is unlawful in Massachusetts and Maryland to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.
Applicants with disabilities that believe they require an accommodation or assistance with a position, please email our HR team at hradmin@eliassen.com. This email inbox is designed exclusively to assist job seekers whose disability prevents them from being able to apply online. Emails sent for other purposes will not receive a response.
Please be advised that a number of fraudulent job postings have been released under the Eliassen Group brand.
Unfortunately, fraudulent job postings can happen. If anyone reaches out to you about an open position connected with Eliassen Group, never provide personal or financial information to anyone who is not clearly associated with Eliassen Group
If anyone seemingly from Eliassen Group has ever requested this personal information in the past or does so in the future, please contact fraud@eliassen.com.
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, as indicated above