Principal Platform Engineer

At Sunflower Bank, N.A., we’re experiencing great growth. Since our founding in 1892, we've been committed to serving our communities and supporting the team members who make it all possible. As a full-service financial institution, we offer a full range of relationship-focused services to meet personal, business, and wealth-management financial objectives. Creating Possibility is not just our mission, it’s what we do every day for clients and associates. Learn more about Sunflower Bank, N.A. at sunflowerbank.com. Sunflower Bank, N.A. is looking for an energetic, highly motivated individual to fill the position of a full-time P rincipal Platform Engineer . This position is under consideration for hybrid. Description: As a Principal Platform Engineer, you will define and drive the technology vision for Platform Engineering within Sunflower Bank's broader IT modernization strategy. This role connects strategic business outcomes to engineering execution by standardizing, simplifying, and automating the platforms and practices used to deliver secure, resilient, compliant, and scalable banking capabilities. You will lead the creation and evolution of Sunflower Bank's Internal Developer Platform (IDP) and shared technology services, providing governed self-service, engineering standards, golden paths, automation, observability, and reusable infrastructure capabilities that accelerate delivery, reduce operational risk, and eliminate unnecessary complexity. Operating as both a technical strategist and hands-on engineering change leader, you will influence technical direction across the enterprise, establish measurable standards, and partner with Architecture, Cybersecurity, Infrastructure, Operations, Data, and Application teams to modernize the technology estate and improve delivery speed, reliability, control effectiveness, and business outcomes. Technology delivery and operations teams are the platform's customers and partners. Success is measured through adoption, developer and operator experience, automation, service reliability, control effectiveness, cost transparency, reduction in manual work and technical debt, and the consistent delivery of business value. Responsibilities: Platform Engineering Strategy & Vision Define and execute a multi-year Platform Engineering roadmap aligned to Sunflower Bank's business strategy, target-state architecture, risk appetite, merger integration priorities, and IT modernization outcomes. Establish and evolve the Internal Developer Platform and shared platform services using a product operating model, with clear service ownership, roadmaps, lifecycle standards, support models, and measurable customer outcomes. Define platform capabilities including: Developer self-service Infrastructure automation CI/CD services Security guardrails Identity integration Observability Service onboarding Runtime platforms Promote a platform-first, reuse-before-build mindset across technology teams to reduce tool sprawl, one-off solutions, and long-term support complexity. Measure platform success through a balanced scorecard covering adoption, time to deliver, reliability, security and compliance, unit cost, automation, customer experience, technical debt reduction, and operational efficiency. Internal Developer Platform (IDP) Design and lead the implementation of an enterprise Internal Developer Platform. Establish secure-by-design engineering golden paths that enable teams to rapidly build, deploy, operate, and retire solutions using approved, supportable, and auditable patterns. Build reusable platform capabilities that reduce duplication and improve consistency across engineering teams. Create policy-governed self-service experiences that allow authorized teams to provision environments, deploy applications, access approved services, and consume infrastructure safely, consistently, and with traceable approvals. Drive platform product management practices, including platform roadmaps, adoption strategies, and customer feedback loops. Engineering Architecture & Design Define engineering reference architectures, platform design standards, and technology lifecycle requirements that guide modernization, integration, and decommissioning decisions. Establish reusable patterns for hybrid cloud, infrastructure, application delivery, integration, data, identity, resilience, and security services, while reducing unnecessary variation across the enterprise. Serve as a senior technical authority on engineering platforms and enterprise-scale systems. Ensure solutions meet defined requirements for scalability, recoverability, resiliency, observability, supportability, security, data protection, regulatory compliance, and total cost of ownership. Partner with Enterprise Architecture to evolve target-state technology architecture. Reliability, Operations & Observability Establish pragmatic Site Reliability Engineering (SRE) practices across the organization, including service ownership, reliability engineering, capacity management, problem management, and continuous improvement. Define Service Level Indicators (SLIs), Service Level Objectives (SLOs), and Error Budget frameworks. Lead an enterprise observability and operational intelligence strategy that consolidates tooling, improves end-to-end service visibility, and includes: Monitoring Logging Tracing Incident management Operational analytics Drive automation of operational, control, and evidence-collection processes to improve resiliency, accelerate recovery, reduce manual effort, and strengthen audit readiness. Provide technical leadership for critical incidents, root-cause remediation, recurring-problem elimination, and systemic platform risks, with clear accountability and transparent executive communication. DevOps & Automation Drive modernization and rationalization of CI/CD capabilities and software delivery pipelines, emphasizing standard services, embedded controls, automated testing, and repeatable release practices. Define standards for Infrastructure as Code (IaC), GitOps, platform automation, and release engineering. Establish engineering workflows that make the secure, compliant, and supportable path the easiest path, while improving repeatability, evidence quality, and delivery velocity. Continuously evaluate emerging technologies and practices that improve engineering effectiveness. Eliminate delivery bottlenecks through automation and platform enablement. Engineering Governance & Standards Define, publish, and govern enterprise engineering standards, approved patterns, exception processes, and technology lifecycle expectations, with clear ownership and measurable conformance. Establish platform guardrails that balance developer autonomy with security and regulatory requirements. Partner closely with Information Security, Enterprise Risk, Compliance, and Internal Audit to translate requirements into automated guardrails, preventive controls, continuous monitoring, and reusable evidence. Promote technology consistency and architectural alignment across business domains. Cross-Functional Leadership Influence technology direction without direct authority across engineering, infrastructure, security, architecture, and data teams. Serve as a trusted advisor to senior technology leadership. Facilitate alignment between strategic technology initiatives and platform capabilities. Drive adoption of platform services through transparent roadmaps, documentation, enablement, communities of practice, and a collaborative 'do it with me' partnership model. Engineering Enablement & Developer Experience Continuously improve the developer experience across the organization. Reduce engineering friction and cognitive load through standardized tooling, automation, self-service, and authoritative documentation that supports a centralized source of truth for operational and engineering artifacts. Establish role-based technical training, onboarding standards, engineering enablem