Senior Full Stack Engineer (Java & React)

Permanent, full-time, B2B

With 5,400+ employees and over 80,000 institutional, commercial, and payments clients, we operate from more than 80 offices spread across six continents. As a Fortune 100, Nasdaq-listed provider, we connect clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors. Whether you want to forge a career connecting our retail clients to potential trading opportunities, or ingrain yourself in the world of institutional investing, StoneX Group is made up of four business segments that offer endless potential for progression and growth

• Back End: Java 21+, Spring Boot, REST APIs, Kafka/Redpanda, gRPC, PostgreSQL, MSSQL, Unit/Integration Testing
• Front End: React.js, Node.js
• Architecture: Micro-services, event-based architecture
• Cloud: CI/CD DevOps, Azure, GitHub Enterprise

• Define and evolve multi-year technical strategy and architecture standards across React/Vite, Node.js/Fastify, and Java Spring Boot platforms.
• Act as the final technical escalation point for the organization's most complex cross-system design and performance challenges.
• Establish and govern engineering-wide standards for architecture, security, scalability, and reliability across all product teams.
• Mentor and grow Staff and Senior Engineers, and help shape the technical career ladder and promotion criteria.
• Partner directly with senior engineering leadership, principal architects, and product executives to align technical roadmaps with business strategy.
• Lead evaluation and adoption of emerging technologies, driving organization-wide proofs of concept and build-vs-buy decisions.
• Drive resolution of systemic reliability, scalability, and security risks at the platform level, beyond any single team's scope.
• Champion engineering culture, technical documentation standards, and cross-team knowledge sharing at scale.
• Represent engineering in high-stakes technical decisions with external vendors, regulators, or enterprise architecture boards where relevant.

• University qualification in Computer Science, Software Engineering or similar discipline or great GitHub portfolio showcasing your most recent projects.

• Mastery of JavaScript/TypeScript (ES6+), HTML5, CSS3, and large-scale frontend architecture, including micro frontends.
• Deep, proven expertise in React.js, Node.js, and frameworks like Fastify or Express at enterprise scale.
• Mastery of Java Spring Boot for architecting large-scale, high-availability REST APIs and microservices.
• Demonstrated track record of setting technical direction across multiple engineering organizations or business units.
• Deep expertise in Azure App Services, Azure Functions, Azure DevOps, and enterprise-grade cloud architecture.
• Expert-level understanding of distributed systems, RESTful API design, and enterprise integration patterns.
• History of mentoring Staff-level engineers and influencing organization-wide engineering career frameworks.
• Advanced expertise in database systems (e.g., PostgreSQL, MS SQL Server), including large-scale data architecture decisions.
• Exceptional communication and influencing skills, with experience advising VP- and C-level stakeholders on technical strategy.
• Experience using GitHub Copilot with modern models (e.g., Claude Opus or Sonnet), and shaping organization-wide AI-assisted engineering practices.

• Great knowledge/experience in DevOps and CI/CD 

• Hybrid 4-days in office (we have private parking for employees)
• B2B contract for 12 months

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