Application Developer III

Old National Bank; Chicago (IL); On-site; USD 98,400 - 199,000; Full time

Benefits offered by this job

Medical, dental, and vision insurance

401K

Continuing education opportunities

Employee assistance program

Impact Network Groups

Job summary

Old National Bank is seeking an Application Developer III in Chicago to lead the design and governance of autonomous software delivery systems across the Product Engineering organization. You will drive development and operation of agentic workflows, ensuring secure, compliant outcomes within a regulated banking environment.

You will write high-quality code in Golang, Python, and TypeScript, integrate AI services, and mentor engineers while aligning with governance, risk, and compliance

Qualifications

• 6-8 years of professional software engineering experience with ownership of complex, production systems.
• Strong coding proficiency in Golang, Python, and TypeScript, including API design, integration patterns, and cloudnative development.
• Experience with AWS, GitOps CI/CD, serverless architectures, and Terraform.
• Hands-on experience integrating LLM platforms (AWS Bedrock, Anthropic), embeddings/vector stores, and orchestration frameworks.
• Familiarity with AI evaluation/observability, guardrails, policyascode, and designing secure, compliant systems in regulated environments.

Responsibilities

• Own intent to outcome delivery: convert business intent/specifications into shipped features using agentic workflows.
• Write and review high-quality code in Golang, Python, and TypeScript across components and services.
• Testing & validation: ensure autonomous and human-written code is validated through automated testing and verifications.
• Architect and orchestrate AI systems using LLMs, RAG pipelines, and orchestration frameworks.

Skills

Golang

Python

TypeScript

AWS

GitOps CI/CD

Terraform

Serverless architectures

LLM platforms

AI evaluation/observability

Tools

RAG pipelines

program synthesis

AWS Bedrock

Anthropic

embeddings/vector stores

Job description

Job Locations

US-MN-Saint Paul | US-MN-Lake Elmo | US-IN-Evansville | US-IL-Chicago

Category/Function

Information Technology

Position Type

Regular Full-Time

Requisition ID

2026-19615

Workplace Type

On Site

Application Developer III

Overview

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.

Responsibilities

The Application Developer III designs and governs autonomous software delivery systems that convert intent into compliant, productiongrade outcomes. This role leads development, architecture, and operation of agentic workflows-integrating LLMs, services, code generation, and guardrails-to deliver secure, reliable capabilities across Old National Bank's Product Engineering organization. While the role optimizes for outcomes over code, strong engineering fundamentals and the ability to write highquality software remain essential for shaping, supervising, and controlling autonomous systems.

Salary Range

The salary range for this position is $98,400 - $199,000 per year plus bonus. The base salary indicated for this position reflects the compensation range applicable to all levels of the role across the United States. Actual salary offers within this range may vary based on a number of factors, including the specific responsibilities of the position, the candidate's relevant skills and professional experience, educational qualifications, and geographic location.

Key Accountabilities

Key Accountability #1: Delivery & Engineering Execution

• Own intent to outcome delivery: convert business intent/specifications into shipped, compliant features using agentic and autonomous workflows.
• Write and review high-quality code: write in Golang, Python, and TypeScript when establishing patterns, building secure components, integrating services, or ensuring agent-produced code meets standards.
• Testing & validation: ensure autonomous and human-written code is validated through automated testing frameworks, and continuous verification to maintain safety and correctness.
• Optimize for outcomes, not code volume: improve cycle time, reliability/SLOs, quality, and delivery economics; deploy human coding effort where it provides leverage or safety.
• Risk & readiness: identify ambiguity, dependencies, and operational risk early; harden prototypes into resilient production systems.

Key Accountability #2: Architecture, Platforms & AI Systems

• Architect and orchestrate AI systems: use LLMs, RAG pipelines, program synthesis, CI/CD generation, and runtime automation.
• Cloud foundations: design and operate AWS cloudnative/serverless systems using GitOps CI/CD workflows and Terraform.

Key Accountability #3 - Leadership, Governance & Enablement

• Crossfunctional leadership: collaborate with product, security, risk, and compliance to define intents, acceptance criteria, and controls.
• Governance & safety: implement responsibleAI controls, evaluation frameworks, guardrails, and humanintheloop reviews to ensure compliant outcomes in a regulated environment.
• Mentorship & review: mentor engineers in agentic workflows, AIevaluations, software design, and coding best practices; lead design and code reviews.

Key Competencies for Position

• Develops Talent: You Own You - You own your development and career. Actively assesses self by leveraging feedback to enhance knowledge, skills and behavior. Leverages own strengths and those of team members to meet individual and team goals supporting both internal and external client needs. Continuously develops self for current and future roles.
• Promotes Change: Actively seeks information to understand the rationale, implications, and impact for changes. Remains agile by quickly modifying daily behavior, leveraging resources, and trying new approaches to effectively embrace change. Willing to act quickly, learn and adjust as needed. Identifies and recommends changes to leadership to improve performance. Aligns activities to meet individual, team and organizational goals.
• Strategy in Action: Breaks down larger goals into smaller achievable goals and communicates how they are contributing to the broader goal. Actively seeks to understand factors and trends that may influence role. Anticipates risks and develops contingency plans to manage risks. Identifies opportunities for improvement and seeks insights from other sources to generate potential solutions. Aligns activities to meet individual, team and organizational goals.
• Compelling Communication: Effectively and transparently shares information and ideas with others. Tailors the delivery of communication in a way that engages the audience and that is easy to understand and retain. Unites others towards common goal. Asks for others' opinions and ideas and listens actively to gain their support when clarifying expectations, agreeing on a solution and checking for satisfaction.
• Makes Decisions & Solves Problems: Takes ownership of the problem while collaborating with others on a resolution with an appropriate level of urgency. Collaborates and seeks to understand the root causes of problems. Evaluates the implications of new information or events and recommends solutions using decisions that are sound based on what is known at the time. Takes action that is consistent with available facts, constraints and probable consequences.
• Delights Clients: Passionately serves internal/external clients with excellence. Maintains a growth mindset staying current with developments and trends in areas of expertise influencing client satisfaction both internally and externally. Understands data, metrics and/or financial information, and how they tie to client satisfaction and business outcomes related to position, client and/or team. Nurtures client relationships by listening, prioritizing, and acting responsibly to meet client needs, mitigate risk and add shareholder value.
• Leads Inclusively: Seeks diverse relationships to learn more about people from other cultures and backgrounds. Gathers information with curiosity and humility to learn more about people from other cultures and backgrounds including impacts on norms, behaviors and expectations (e.g., social norms, decision-making approaches, and preferences). Advocates for diverse perspectives. Continually examines own biases and behaviors to avoid stereotypical responses.
• Personifies ONB Culture: Consistently demonstrates Old National's culture and values in daily interactions. Models our values - how we show up in the workplace. Places the organization's goals before individual or team goals. Demonstrates the desire to be part of something beyond themselves by investing time, heart, and expertise to help clients and communities thrive.

Qualifications and Education Requirements

• 6-8 years of professional software engineering experience with ownership of complex, production systems.
• Strong coding proficiency in Golang, Python, and TypeScript, including API design, integration patterns, and cloudnative development.
• Experience with AWS, GitOps CI/CD, serverless architectures, and Terraform.
• Hands-on experience integrating LLM platforms (AWS Bedrock, Anthropic), embeddings/vector stores, and orchestration frameworks (AWS Bedrock AgentCore, or similar).
• Familiarity with AI evaluation/observability, guardrails, policyascode, and designing secure, compliant systems in regulated environments.

Old National is proud to be an equal opportunity employer focused on fostering an inclusive workplace and committed to hiring a workforce comprised of diverse backgrounds, cultures and thinking styles.

As such, all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, protected veteran status, status as a qualified individual with disability, sexual orientation, gender identity or any other characteristic protected by law.