Lead Software API Architect

Overview

Permanent, full-time, hybrid.

Connecting clients to markets – and talent to opportunity.

With 4,300 employees and over 400,000 retail and institutional clients from more than 80 offices spread across five continents, we’re a Fortune-100, Nasdaq-listed provider, connecting clients to the global markets – focusing on innovation, human connection, and providing world-class products and services to all types of investors.

At StoneX, we offer you the opportunity to be part of an institutional-grade financial services network that connects companies, organizations, and investors to the global markets ecosystem. As a team member, you'll benefit from our unique blend of digital platforms, comprehensive clearing and execution services, personalized high-touch support, and deep industry expertise. Elevate your career with us and make a significant impact in the world of global finance.

Business Segment Overview: 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 highly experienced Lead or Senior Architect with deep expertise in API management and development to lead our enterprise-wide API strategy. This individual will be responsible for architecting secure, scalable, and resilient API solutions across hybrid environments (on-premise and cloud, with a strong focus on Azure). The successful candidate will play a key role in shaping our API platform, ensuring strong governance and seamless service-to-service communication, while supporting business needs across internal and external integrations.  

Primary duties will include:

• Assist with designing, implementing, and governing API management strategies across hybrid environments (Azure and on-premise). 

• Help to lead the end-to-end lifecycle of API development including requirements analysis, design, testing, deployment, and monitoring. 

• Work closely with Security Architects to support API security best practices including authentication, authorization, and encryption for internal and external APIs. 

• Contribute to service-to-service authorization patterns to ensure secure inter-service communication across platforms. 

• Collaborate with development teams, DevOps, and security architects to ensure consistency, scalability, and compliance across all API implementations. 

• Set up and maintain a developer portal (e.g. Readme or bump.sh) with clear, interactive, and well-structured API documentation to enhance usability and adoption across internal and external consumers. 

• Design solutions that support robust API versioning strategies and facilitate deployment across multiple environments (e.g., dev, test, staging, production). 

• Help to define and maintain API governance policies including versioning, documentation, and lifecycle management. 

• Support the adoption of API-first and event-driven architecture across the enterprise. 

• Engage with business stakeholders and technology teams to ensure API capabilities align with strategic business goals. 

• Provide leadership and mentorship to development teams and junior architects. 

• Stay current with industry trends and best practices in API management, security, and enterprise architecture. 

Qualifications

To land this role you will need:

• At least 8+ years’ experience with API design, management and development. 

• Proven experience as a Senior or Lead Architect in enterprise API management and development. 

• Hands-on experience with Azure API Management (APIM) and other Azure services (e.g., Azure AD, Azure Functions, App Gateway). 

• Familiarity with API security concepts and protocols (OAuth 2.0, OpenID Connect, mTLS, JWT, etc.); deep expertise is beneficial but not required, as you will collaborate with a dedicated Security Architect. 

• Solid understanding of RESTful API principles, microservices architecture, and API-first design. 

• Experience implementing API gateway patterns, rate limiting, caching, logging, and analytics. 

• Strong background in enterprise integration patterns and technologies. 

• Familiarity with CI/CD pipelines and Infrastructure as Code (IaC) in a cloud environment. 

• Knowledge of different programming languages — .NET Core is required; experience with additional languages (e.g., Java, Python) is beneficial. 

• Understanding of service-to-service communication and authorization mechanisms in cloud and hybrid environments would be beneficial. 

• Knowledge of messaging systems such as AMQ, Redpanda, or Kafka would be beneficial. 

• Familiarity with streaming API design and technologies, ideally Lightstreamer, is advantageous. 

• Excellent communication, collaboration, and stakeholder engagement skills. 

• Strong communication and presentation skills   

• Fluent English (C1)   

Education / Certification Requirements:

• Bachelor’s degree in computer science, Information Technology, or a related field; relevant certifications (e.g., Azure Solutions Architect, TOGAF) are a plus. 

Working environment:

• Hybrid in our office at ul. Mogilska 35, Cracow (private parking for employees).

• FTE (UoP).