Principal Engineer with Agentic AI expertise

Overview

Connecting clients to markets – and talent to opportunity.

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.

Business Segment Overview

Corporate: Engage in a deep variety of business-critical activities that keep our company running efficiently. From strategic marketing and financial management to human resources and operational oversight, you'll have the opportunity to optimize processes and implement game-changing policies.

Responsibilities

Position Purpose

We are seeking a Principal Engineer with deep agentic development experience to lead major components of our Payments technology transformation. You will architect, design, and implement missioncritical distributed systems while driving adoption of agentpowered engineering using tools such as Claude Code and emerging autonomous development agents.

This role sets technical direction, accelerates delivery using AIaugmented workflows, and enables engineering teams to achieve 10-20 productivity improvements through structured, agentready codebases.

Primary duties will include:

• Architecture & Technical Leadership
• Lead the design and development of distributed, microservicebased enterprise applications using Java, Spring Boot, and cloudnative patterns.
• Shape the future Payments platform architecture and contribute to fronttoback reengineering initiatives across GP.
• Drive system design excellence through formal design reviews, ADRs, and technical deepdives.
• Ensure high standards for reliability, performance, scalability, and observability.
• Agentic Development Leadership
  
  

This is the major differentiator of the role.

• Introduce, design, and operationalize agentbased engineering workflows across the SDLC.
• Use tools such as Claude Code, capable of repositorywide reasoning, automated refactoring, debugging, and commit generation to accelerate engineering throughput.
• Build agentready codebases through modular design, clean documentation, and comprehensive test coverage — key enablers of successful agentic development.
• Actively contribute to and/or lead the new agentic development team for Payments (e.g., new wallet solution POC).
• Evaluate AIgenerated code for quality, correctness, architectural alignment, and security.
• Develop internal best practices, training materials, and standards for agentaccelerated engineering.
• Delivery & Execution
• Deliver highquality software aligned to business needs and customer outcomes.
• Translate product requirements into scalable technical solutions; break down complex features into actionable tasks.
• Implement robust automated testing and continuous integration practices.
• Diagnose, debug, and resolve complex issues across distributed systems and environments.
• Coaching, Mentoring & Technical Culture
• Mentor senior and junior engineers on system design, coding best practices, and agentcentric engineering patterns.
• Promote collaborative working across global agile teams.
• Champion engineering excellence, continuous improvement, and experimentation with AIaccelerated development.
  
  

Qualifications


To land this role you will need:

Core Engineering Skills

(Aligned with existing Principal Engineer JDs)

• 12–15+ years in software engineering (backend or fullstack).
• Expertise with Java, Spring Boot, microservices, cloud-native patterns, and distributed systems.
• Strong understanding of cloud platforms (Azure or AWS) and containerization (Docker/Kubernetes).
• Messaging technologies (Kafka, RabbitMQ, Azure Service Bus).
• Experience with SQL and NoSQL databases (SQL Server, MongoDB).
• Solid grasp of CI/CD, Git, DevOps tooling, test automation frameworks.
• Experience in crossborder payments or financial markets.
• Leading or participating in large transformation programs.
• Prior experience introducing new engineering methodologies (AI/ML, agentic, DevOps, cloud migrations.
• Opportunity to build the future of global payments technology with a modern, cloudnative and agentaugmented engineering stack.
• Work alongside global engineering and product teams driving cuttingedge innovation.
• Competitive compensation and benefits.
• A culture that values autonomy, ownership, continuous learning, and experimentation.
  
  

Agentic Development Skills


(What makes this role unique)

• Handson experience with agentic development tools such as Claude Code, Copilot Workspace, or equivalent.
• Ability to orchestrate multiagent workflows (refactoring, debugging, dependency updates, code generation).
• Deep understanding of how design quality affects agent output (modularity, documentation, test coverage).
• Experience evaluating and validating AIgenerated code.
• Ability to build frameworks, patterns, and tooling for agentpowered engineering at scale.
  
  

Soft Skills

• Strong analytical, problemsolving, and communication skills.
• Ability to collaborate effectively across distributed global teams.
• Forwardthinking mindset and deep curiosity about emerging technologies in payments and AI.
  
  

Education

• Degree in Computer Science, Engineering, or related field.