Corey Duffy

Corey Duffy

Senior Software Engineer & Tech Lead

Over a decade writing software and building robust systems. Currently building AI products and digital solutions for enterprise clients, while keeping the robots honest.

About

Hey, I'm Corey, I currently live just outside Derry, and I've worked as a software engineer from the moment I left school (over a decade ago now), initially working full-time while studying for my degree.

Since then, I've worked across a range of companies, startups and scale-ups on back-end services, front-ends, automated testing, DevOps, DevSecOps, AI/LLMs and everything in-between.

What initially attracted me to software development was the idea of being able to create and build whatever I could think of. What has kept me engaged with software development is the sense of honing a craft.

Across all of my interests, be it software engineering, running or strength-training, I love the sense of progression. I love the ability to learn, adapt and improve, and see those improvements over time.

In this space, there is always more to learn, there are always ways to grow.

Anything I write here is in pursuit of that improvement. It's my way of learning, re-learning or confirming what I already know.

I definitely don't have all the answers, but (hopefully, at least) I'm always improving, and hopefully there's something useful here for others too.

Experience

Senior Software Engineer

Brightbeam Apr 2025 – Present
AI and digital intelligence solutions for enterprise clients
  • Led a customer support agent project from concept to completion, enabling client to win Investment in Innovation Award
  • Developed working proof-of-concepts for agentic solutions and computer vision projects, enabling clients to visualise AI capabilities and achieve stakeholder buy-in
  • Planned and architected multiple AI solutions for enterprise clients with complex security requirements
  • Built reusable infrastructure scripts and shared tooling to accelerate team delivery

Product Engineer

Fluent Aug 2024 – Nov 2024
AI Text-to-SQL product development
  • Improved generated SQL accuracy by over 75% through metrics layer implementation
  • Halved response time and significantly improved LLM output quality through prompt tuning
  • Delivered new BI features improving customer retention
  • Conducted customer interviews to establish product-market fit

Software Developer

m3ter Oct 2022 – Aug 2024
Usage-based billing platform development
  • Reduced console search time from over a minute to under a second via new search service
  • Reduced ad-hoc bill calculation time from 30+ minutes to seconds
  • Solved critical security issue with "support user" access system
  • Addressed high-risk architectural issues ensuring stability under vast data loads

Software Engineer

Uleska Nov 2020 – Oct 2022
Security tool automation platform
  • Mentored developers in best practices, improving code quality and review culture
  • Reduced incident response time from hours to minutes via observability initiative
  • Pioneered "Toolkits" feature driving major increase in customer satisfaction
  • Implemented self-service flow with Stripe payments improving product adoption

Graduate Software Engineer

Signifyd Sep 2019 – Nov 2020
Fraud detection microservices
  • Developed features enabling chargeback analysts to make cost-saving decisions in under a minute
  • Reduced operating costs by £1000s via Elasticsearch cluster restructuring

Associate Software Engineer

Kainos Sep 2015 – Aug 2019
WorkSmart SaaS automated testing system
  • Led team meetings, sprint ceremonies, and product roadmap discussions
  • Developed structured mentorship program for faster onboarding
  • Primary contact during critical maintenance and feature releases

Skills

Languages & Frameworks

Python · Django · Java · Micronaut · Spring · JavaScript · React · HTML/CSS

AI & Data

LLMs · Vector Databases · PostgreSQL · MySQL · ElasticSearch · ClickHouse

Cloud & Infrastructure

AWS · Azure · Docker · Kubernetes · CDK · Git

Get In Touch

Let's connect.