Full Stack Java Developer job at Apex Systems in New York, NY

Title: Full Stack Java Developer Location: New York United States Contract

: Job#: 3031585 Apex Systems is a world class services business that incorporates industry insights and experience to deliver solutions that fulfill our clients' digital visions. Apex has an opportunity for a Full Stack Java Developer to join our fast-paced financial services partner on an exciting initiative! Role: Full Stack Java Developer Location: NYC, Hybrid onsite Term: 8+ Mo.

: Our client is seeking a Full Stack Java Developer to support and modernize a core Java platform that underpins front‑office trading and capital markets functions. This role is part of a highly technical delivery team focused on uplisting, remediation, and modernization of a mature Java environment within a regulated, high‑availability financial services context. This is a hands‑on engineering role for someone who enjoys working close to the code, understands production systems, and is comfortable navigating the controls, governance, and rigor that come with investment banking technology.

Design, develop, and enhance Java‑based applications supporting front‑office trading and capital markets workflows Contribute to application modernization and uplift initiatives, including refactoring legacy components and improving performance, stability, and scalability Collaborate with other engineers, QA, and stakeholders to deliver high‑quality solutions in a team‑based Agile environment Support production‑oriented development, including troubleshooting, defect resolution, and remediation work Ensure solutions align with security, compliance, and regulatory standards common to global financial institutions Document technical designs and actively participate in code reviews and knowledge sharing

Strong hands‑on Java development experience (backend‑leaning full stack) Proven ability to work independently while collaborating effectively within a team Experience developing in enterprise or regulated environments (financial services strongly preferred) Comfortable working on complex, existing codebases rather than greenfield only Strong verbal and written communication skills; fluent English required Preferred / Nice‑to‑Have Experience Exposure to Fixed Income or Capital Markets technology (trading, risk, market data, post‑trade, etc.) Experience with common Santander‑adjacent stacks such as: Spring / Spring Boot RESTful services and API‑based architectures SQL and relational databases Front‑end exposure (e.g., Angular, React, or similar) CI/CD tools (e.g., Jenkins, Git‑based workflows) Cloud exposure (AWS or similar environments) Familiarity or curiosity around AI‑assisted development, automation, or analytics Spanish language skills (