Application Developer III

Old National Bank•Evansville, IN

3d•$98,400 - $199,000

About The Position

Old National Bank has been serving clients and communities since 1834. With over $70 billion in total assets, we are a regional powerhouse deeply rooted in the communities we serve. As a trusted partner, we thrive on helping our clients achieve their goals and dreams, and we are committed to social responsibility and investing in our communities through volunteering and charitable giving. We continually seek highly motivated and talented individuals as our people are critical to our success. In return, we offer competitive compensation with our salary and incentive program, in addition to medical, dental, and vision insurance. 401K, continuing education opportunities and an employee assistance program are also included in our benefit suite. Old National also offers a variety of Impact Network Groups led by team members who are passionate about driving engagement, creating awareness of diverse backgrounds and experiences, and building inclusion across the organization. We offer a unique opportunity to join a growing, community and client-focused company that is firmly rooted in its core values.

Requirements

Bachelor's degree in Computer Science or a related field, or equivalent practical experience (at this level, a track record of owning production systems carries the most weight).
5–8 years of professional software engineering experience, including ownership of complex, production systems.
Strong proficiency in two or more of Go, Python, and TypeScript, including API design, integration patterns, and cloud-native development.
Experience with AWS, CI/CD, and infrastructure-as-code (Terraform); familiarity with serverless architectures.
Demonstrated ability to build secure, reliable systems and to raise the quality bar for a team through reviews and mentorship.
Experience building features that integrate existing AI models - retrieval-augmented generation (RAG), tool/function calling, agent orchestration, evaluations, and guardrails.
Experience with AI evaluation / observability, guardrails, and policy-as-code.

Nice To Haves

Experience delivering compliant software in a regulated financial-services environment.
Deep experience with a specific framework is not required - we care that you understand the patterns and can apply them in our environment.

Responsibilities

Owns delivery of complex features and small systems through production, resolving ambiguous, open-ended problems without hand-holding, within Old National Bank's Product Engineering organization, and sets the technical direction for their own work.
Hardens prototypes into resilient, compliant production systems and shapes how the team applies AI and agentic delivery to ship secure, reliable software faster.
Mentors Developer I and II engineers through pair programming and code-review coaching, in software design, coding best practices, and agentic workflows.
Leads design and code reviews for their area.
Partners with product, security, and risk to shape acceptance criteria and appropriate controls, and applies responsible-AI practices (evaluation, guardrails, human-in-the-loop) in a regulated environment.
Converts business intent and specifications into shipped features that meet functional, non-functional, and compliance requirements, increasingly using agentic and AI-assisted workflows.
Writes and reviews high-quality code when establishing patterns, building secure components, integrating services, or ensuring AI-produced code meets standards.
Ensures both human-written and AI-assisted code is validated through automated testing and continuous verification to maintain safety and correctness.
Optimizes for outcomes: improve cycle time, reliability/SLOs, quality, and delivery economics; apply engineering effort where it provides the most leverage or safety.
Identifies ambiguity, dependencies, and operational risk early; hardens prototypes into resilient production systems.
Follows the bank's change-management discipline - ships changes to production through documented review and approval, respecting segregation of duties and auditability.
Designs and builds AI-enabled systems on Amazon Bedrock, and secures them by applying Bedrock Guardrails and prompt designs that defend against prompt injection, prompt leaking, and jailbreaking.
Designs and operates AWS cloud-native / serverless systems using GitOps CI/CD and Terraform.
Sets and documents technical patterns for their area, and influences the broader technical direction.