Developer-Full Stack Senior

Job#: 3030479 Job Description: We Are Hiring a Senior Full‑Stack Developer! Role: Senior Full‑Stack Developer (Financial Forecasting Applications) Supporting: Large Financial Services Client Location: McLean, VA (Onsite) Assignment Type: Contract Only Duration: 3 Months Role Overview We are seeking an experienced Senior Full‑Stack Developer to support a high‑visibility enterprise forecasting platform used for long‑term financial projections, scenario analysis, and regulatory reporting. This role is ideal for a hands‑on engineer who enjoys modernizing complex systems, improving performance at scale, and partnering closely with business stakeholders to deliver accurate, reliable, and mission‑critical software. You’ll play a key role in enhancing forecasting engines, supporting time‑sensitive production runs, and ensuring the platform continues to meet evolving business and regulatory needs. Key Responsibilities • Refactor and modernize financial accounting and forecasting applications to improve maintainability, performance, and scalability • Develop and enhance core forecasting engine features to improve model accuracy and runtime efficiency • Support critical quarterly and annual production runs, ensuring data integrity, accuracy, and timely delivery • Troubleshoot, diagnose, and resolve defects while reducing technical debt • Write clean, efficient, well‑documented code following software engineering best practices • Build and maintain strong automated unit and integration test coverage • Collaborate across data, services, APIs, and infrastructure layers to deliver end‑to‑end solutions • Partner with financial stakeholders to implement new forecasting capabilities and scenario analysis • Assist with platform upgrades, migrations, and adoption of new technologies • Participate in design discussions, code reviews, and documentation efforts Qualifications • 5+ years of hands‑on software development experience using a modern programming language (Python, Java, or C#) • Strong experience with Git in a team‑based development environment • Solid experience with SQL and relational database development • Experience writing and maintaining automated unit tests • Strong problem‑solving skills and familiarity with Agile development practices • Excellent written and verbal communication skills • Preferred • Experience with shell scripting for automation and operational support • Exposure to containerization and orchestration tools (Docker, Podman, Kubernetes) • Financial domain knowledge, particularly fixed income concepts (duration, convexity, spreads, OAS) • Graduate degree in Computer Science, Mathematics, Statistics, or a related quantitative field • Professional certifications or progress toward CFA, FRM, or CPA • Understanding of GAAP accounting fundamentals • Experience working directly with stakeholders and using tools such as JIRA Compensation and Benefits: The pay rate for this position is between $65.00 and $75.57 per hour. Please note that the final rate may be contingent on experience and other factors. This employer is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability. Apex uses a virtual recruiter as part of the application process. Click here for more details. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details. Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide. Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click here for more details. Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Apex team member can provide. Apex Systems is part of the Commercial Segment of ASGN Incorporated. NYSE: ASGN 4400 Cox Road Suite 200 Glen Allen, Virginia 23060 Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Apex Systems.