Senior Software Engineer for AI

Lumin Digital; Northern (KY); Hybrid; USD 140,000 - 190,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) match

Flexible PTO

Paid holidays

Paid sick leave

Tuition reimbursement

Cell phone stipend

Job summary

Lumin Digital is seeking a Senior Software Engineer for AI to design, build, and ship AI-powered features on our digital banking platform. You will collaborate with product, security, and data teams to integrate LLMs and AI capabilities into core products and developer tooling.

Ideal candidates have 5+ years in software engineering, 1–2+ years in AI/ML integration, and strong TypeScript/Node.js skills, with experience in cloud infrastructure (AWS) and API design.

Qualifications

• Bachelor's degree in Computer Science or 5 years equivalent experience.
• 5+ years of professional software engineering experience.
• 1-2+ years of hands-on experience with AI/ML integration or LLM-based product development.
• Proficiency with LLM APIs such as Anthropic Claude or OpenAI, including prompt engineering and tool/function calling.
• Proficiency in TypeScript/Node.js.
• Experience with RESTful APIs, microservices architecture, and cloud infrastructure (AWS preferred).
• Demonstrated ability to critically evaluate AI-generated outputs — knowing when to trust, verify, and push back.
• Strong written and verbal communication skills; ability to explain complex AI concepts to non-technical stakeholders.

Responsibilities

• Design and build AI-powered features across Lumin's digital banking platform.
• Integrate LLMs and AI APIs into production systems with robust prompt engineering, output validation, and safety guardrails.
• Evaluate AI outputs for accuracy, reliability, and regulatory compliance.
• Collaborate with product, QE, and other engineering teams to deliver end-to-end AI features.
• Contribute to internal AI knowledge base with patterns and best practices.
• Champion security and fintech compliance in AI feature development.
• Conduct and participate in code reviews to raise technical standards.
• Evaluate new AI tools and frameworks to keep Lumin at the AI frontier.

Skills

AI integration

LLM APIs

TypeScript/Node.js

RESTful APIs

Microservices

AWS

Prompt engineering

Security & compliance

Communication

Education

Bachelor's degree in CS or 5 years exp

Tools

OpenAI API

Anthropic Claude

Node.js tooling

Job description

We are looking for a Senior Software Engineer for AI to join our engineering team. In this role, you will design, build, and ship AI-powered features that directly impact our platform and our clients' members. You'll collaborate closely with product, engineering, security, and data teams to integrate large language models and other AI/ML capabilities into Lumin's core products and developer tooling.

Essential Functions and Responsibilities

• Design and build AI-powered features across Lumin's digital banking platform, including natural language interfaces, intelligent assistants, and automated workflows

• Integrate LLMs and AI APIs (Anthropic Claude, OpenAI, etc.) into production systems with robust prompt engineering, output validation, and safety guardrails

• Evaluate AI outputs critically, ensuring accuracy, reliability, and compliance with financial services regulations

• Collaborate cross-functionally with product managers, designers, QE engineers, and other engineering teams to deliver end-to-end AI features

• Contribute to Lumin's internal AI knowledge base, documenting patterns, best practices, and learnings for the broader engineering organization

• Champion security and compliance in AI feature development, with awareness of fintech regulatory requirements (SOC 2, data privacy, etc.)

• Conduct and participate in code reviews, raising the technical bar for AI-related work across the organization

• Evaluate and recommend new AI tools and frameworks as the ecosystem evolves, helping Lumin stay at the forefront of applied AI in financial services

Position Specifications

Education

• Bachelor's degree in Computer Science or 5 years equivalent experience

Experience

• 5+ years of professional software engineering experience

• 1-2+ years of hands-on experience with AI/ML integration or LLM-based product development

• Proficiency with LLM APIs such as Anthropic Claude or OpenAI, including prompt engineering and tool/function calling

• Proficiency in TypeScript/Node.js

• Experience with RESTful APIs, microservices architecture, and cloud infrastructure (AWS preferred)

• Demonstrated ability to critically evaluate AI-generated outputs — knowing when to trust, verify, and push back

• Strong written and verbal communication skills; ability to explain complex AI concepts to non-technical stakeholders

Travel

• Minimal, generally 12 days or less per year, -2X team get togethers a year

Benefits include:

Medical, dental, and vision insurance; 401(k) with company match; flexible PTO plus 12 paid holidays; paid sick leave; paid parental and family leave; lifestyle spending account; tuition reimbursement; and cell phone stipend. Additional details provided during the interview process.

LIFE AT LUMIN DIGITAL

Lumin Digital is a trailblazer in digital banking solutions, driven by a unique approach to technology, service, and people. We empower credit unions and banks by creating cutting-edge digital experiences that continuously serve, engage, and grow their membership base - and as a 100% cloud-native company, we're purpose-built to unlock the full advantages of the cloud for financial institutions and their users.

At Lumin, we thrive on curiosity and innovation. Our culture is built on trust in our expertise and decisions, respect for diverse perspectives and talents, and boldness in pursuing new ideas. These values shape a workplace where collaboration thrives, ideas flourish, and new possibilities are discovered every day. We encourage our team to explore, experiment, and challenge the status quo - because continuous improvement isn't just a goal, it's how we operate.

Benefits include:

We take care of our people with medical, dental, and vision insurance, a 401(k) with company match, flexible PTO plus 12 paid holidays, paid sick leave, and paid parental and family leave. We also offer a lifestyle spending account, tuition reimbursement, and a cell phone stipend. Additional details are provided during the interview process.

Lumin Digital is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, national origin, disability, protected veteran status, sexual orientation, gender identity, or any other legally protected basis. For more information, visit lumindigital.com.

LIFE AT LUMIN DIGITAL

Lumin Digital is a trailblazer in digital banking solutions, driven by a unique approach to technology, service, and people. We empower credit unions and banks by creating cutting-edge digital experiences that continuously serve, engage, and grow their membership base - and as a 100% cloud-native company, we're purpose-built to unlock the full advantages of the cloud for financial institutions and their users.

At Lumin, we thrive on curiosity and innovation. Our culture is built on trust in our expertise and decisions, respect for diverse perspectives and talents, and boldness in pursuing new ideas. These values shape a workplace where collaboration thrives, ideas flourish, and new possibilities are discovered every day. We encourage our team to explore, experiment, and challenge the status quo - because continuous improvement isn't just a goal, it's how we operate.

Benefits include:

We take care of our people with medical, dental, and vision insurance, a 401(k) with company match, flexible PTO plus 12 paid holidays, paid sick leave, and paid parental and family leave. We also offer a lifestyle spending account, tuition reimbursement, and a cell phone stipend. Additional details are provided during the interview process.

Lumin Digital is an equal opportunity employer. We consider all qualified applicants without regard to race, color, religion, sex, national origin, disability, protected veteran status, sexual orientation, gender identity, or any other legally protected basis. For more information, visit lumindigital.com.