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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 mission‑critical distributed systems while driving adoption of agent‑powered engineering using tools such as Claude Code and emerging autonomous development agents.
This role sets technical direction, accelerates delivery using AI‑augmented workflows, and enables engineering teams to achieve 10-20 productivity improvements through structured, agent‑ready codebases.
StoneX Global Payments is a leading global payments fintech providing cross‑border FX and payments solutions to corporations, NGOs, and institutions across 180+ countries and 140+ currencies. Our mission is to build the next‑generation global payments platform—scalable, efficient, fault‑tolerant, and powered increasingly by intelligent automation.
We are undergoing a multi‑year modernization effort across our front, middle, and back‑office systems, leveraging cloud-native architectures, microservices, and now agentic AI engineering to accelerate delivery and reshape end‑to‑end payment flows.
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 mission‑critical distributed systems while driving adoption of agent‑powered engineering using tools such as Claude Code and emerging autonomous development agents.
This role sets technical direction, accelerates delivery using AI‑augmented workflows, and enables engineering teams to achieve 10-20 productivity improvements through structured, agent‑ready codebases.
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Lead the design and development of distributed, microservice‑based enterprise applications using Java, Spring Boot, and cloud‑native patterns.
Shape the future Payments platform architecture and contribute to front‑to‑back re‑engineering initiatives across GP.
Drive system design excellence through formal design reviews, ADRs, and technical deep‑dives.
Ensure high standards for reliability, performance, scalability, and observability.
This is the major differentiator of the role.
Introduce, design, and operationalize agent‑based engineering workflows across the SDLC.
Use tools such as Claude Code , capable of repository‑wide reasoning, automated refactoring, debugging, and commit generation to accelerate engineering throughput.
Build “agent‑ready” 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 AI‑generated code for quality, correctness, architectural alignment, and security.
Develop internal best practices, training materials, and standards for agent‑accelerated engineering.
Deliver high‑quality 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.
Mentor senior and junior engineers on system design, coding best practices, and agent‑centric engineering patterns.
Promote collaborative working across global agile teams.
Champion engineering excellence, continuous improvement, and experimentation with AI‑accelerated development.
Degree in Computer Science, Engineering, or related field.
Experience in cross‑border payments or financial markets.
Leading or participating in large transformation programs.
Prior experience introducing new engineering methodologies (AI/ML, agentic, DevOps, cloud migrations).
Global financial services network connecting clients to global markets.
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Senior · 12+ years experience
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