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Lead Fullstack Engineer / St Louis / Java / React / MongoDB

St. Louis, Missouri

Hybrid

Contract

$69.5/hr - $78.31/hr

We are seeking a Lead Fullstack Engineer with strong experience in Java, React, and MongoDB to join a Wealth and Investment Management Technology team modernizing a core financial advisor platform. This role is part of a major initiative to overhaul a 25+ year-old legacy system, replacing outdated infrastructure with a modern Spring Boot and microservices-based architecture. The project will streamline account maintenance for financial advisors, reducing legal documentation from 90+ pages to just eight, and significantly improving workflow efficiency.

If you’re excited about building scalable applications, working across both frontend and backend (50/50 split), and leading efforts to modernize mission-critical platforms, this is an opportunity to make a large-scale impact. You’ll join a highly collaborative engineering team working in agile ceremonies while spending the majority of time hands-on coding.

Required Skills & Experience

+ 7+ years of professional software engineering experience

+ Strong expertise with Java Spring Boot for backend development

+ Proficiency with React for frontend development

+ Experience working with MongoDB or other NoSQL databases

+ Fullstack development background with a balance of frontend and backend work

+ Ability to write clean, maintainable, well-tested code in a collaborative environment

+ Experience working in agile teams (stand-ups, retrospectives, sprint planning)

Desired Skills & Experience

+ Familiarity with SQL (Oracle or SQL Server) for cross-team interaction

+ Experience modernizing or rebuilding legacy platforms

+ Background in microservices-based architecture

+ Experience gathering requirements and collaborating with stakeholders across engineering, product, compliance, or risk

+ Leadership experience (mentoring junior engineers, defining technical approaches, guiding design decisions)

+ Strong problem-solving skills and ability to identify work independently

What You Will Be Doing

+ Designing and maintaining backend services in Go

+ Leading development of fullstack features with Java Spring Boot and React

+ Collaborating with financial advisors, engineers, legal, compliance, and risk teams to define requirements

+ Supporting modernization of a legacy financial advisor platform into a microservices-based application

+ Designing and maintaining backend services, APIs, and data integrations with MongoDB

+ Building user-friendly frontends to simplify workflows and improve efficiency

+ Participating in agile ceremonies while dedicating ~90% of time to coding

+ Contributing to long-term architectural decisions and system scalability

The Offer

You will receive the following benefits:

+ Competitive compensation package

+ Medical, Dental and Vision Insurance

+ Hybrid work flexibility with location preference for St. Louis or Charlotte

+ Opportunity to lead within a smaller engineering pod (4–7 engineers) while part of a larger 17-person group

+ Exposure to greenfield modernization work on a high-impact platform

Applicants must be authorized to work in the U.S. on a full-time basis now and in the future.

\#LI-OP

You will receive the following benefits:

+ Medical Insurance - Four medical plans to choose from for you and your family

+ Dental & Orthodontia Benefits

+ Vision Benefits

+ Health Savings Account (HSA)

+ Health and Dependent Care Flexible Spending Accounts

+ Voluntary Life Insurance, Long-Term & Short-Term Disability Insurance

+ Hospital Indemnity Insurance

+ 401(k) including match with pre and post-tax options

+ Paid Sick Time Leave

+ Legal and Identity Protection Plans

+ Pre-tax Commuter Benefit

+ 529 College Saver Plan

Motion Recruitment Partners (MRP) is an Equal Opportunity Employer. All applicants must be currently authorized to work on a full-time basis in the country for which they are applying, and no sponsorship is currently available. Employment is subject to the successful completion of a pre-employment screening. Accommodation will be provided in all parts of the hiring process as required under MRP’s Employment Accommodation policy. Applicants need to make their needs known in advance.

**Posted by:** Olivia Policastro

Specialization:

+ Javascript

+ Java