Senior Software Engineer for AI

Lumin Digital

About The Position

Lumin Digital is seeking a Senior Software Engineer for AI to design, build, and ship AI-powered features that affect its digital banking platform and clients' members. The role works closely with product, engineering, security, and data teams to integrate large language models and other AI/ML capabilities into core products and developer tools. The engineer will develop AI features such as natural-language interfaces, intelligent assistants, and automated workflows; integrate AI models and APIs into production systems; and ensure outputs are accurate, reliable, safe, and compliant with financial-services regulations. The role also contributes to internal documentation and knowledge sharing, participates in code reviews, and evaluates emerging AI tools and frameworks. Lumin Digital describes itself as a 100% cloud-native digital banking solutions company serving credit unions and banks. Its culture emphasizes curiosity, innovation, trust, respect for diverse perspectives, collaboration, experimentation, and continuous improvement. Travel is minimal, generally 12 days or less per year, with approximately two team gatherings annually.

Requirements

Bachelor's degree in Computer Science or five years of equivalent experience.
At least five years of professional software engineering experience.
One to two 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 and Node.js.
Experience with RESTful APIs, microservices architecture, and cloud infrastructure; AWS is preferred.
Demonstrated ability to critically evaluate AI-generated outputs, knowing when to trust, verify, or push back.
Strong written and verbal communication skills, including the ability to explain complex AI concepts to non-technical stakeholders.

Nice To Haves

Experience with AWS cloud infrastructure.

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 into production systems using prompt engineering, output validation, and safety guardrails.
Critically evaluate AI outputs for accuracy, reliability, and compliance with financial-services regulations.
Collaborate 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 by documenting patterns, best practices, and learnings.
Champion security and compliance in AI feature development, with awareness of fintech regulatory requirements such as SOC 2 and data privacy.
Conduct and participate in code reviews, raising the technical bar for AI-related work.
Evaluate and recommend AI tools and frameworks as the ecosystem evolves.