Patrick Lehmann headshot
Senior full-stack engineer in fintech & payments

Patrick
Lehmann

|
I build payment and retail systems in C#/.NET and TypeScript that serve real businesses at scale. At Global Payments I've shipped analytics and compliance integrations across a portal used by 22,000+ merchants, contributed to UK/Ireland market expansion readiness, and reduced PR cycle time by 40%+ as the team's GitHub Copilot SME. Outside work, I'm the founder of Lehmann Digital — built in Go, PostgreSQL, and Next.js.
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About Me

Senior full-stack engineer with 7+ years building fintech and enterprise systems

Impact at Scale

I build production systems in C#/.NET and TypeScript that process payments and serve merchants at scale. At Global Payments, I shipped Pendo Analytics and OneTrust Cookie Consent across a portal used by 22,000+ merchants — integrating across Angular microfrontends via postMessage-based iframe architecture — and contributed to UK and Ireland market expansion using Azure AD B2C authentication.

Beyond Global Payments, I founded Lehmann Digital, a multi-tenant client portal built from scratch in Go, PostgreSQL, and Next.js. I've also served as my team's GitHub Copilot SME, introducing AI-assisted workflows that cut PR cycle time by 40%+.

🎯 Beyond Code

  • • Disc golf strategy & precision
  • • Christian study & apologetics
  • • Family time with Hillary and Adeline
  • • Cross-team mentoring
  • • Process optimization

What Drives Me

01Living out my Christian faith through work and service
02Solving complex problems with elegant solutions
03Mentoring teams through technological transitions
04Shipping production systems that serve real businesses
05Championing modern development practices

Quick Stats

6+
Years Experience
22K+
Merchants Served
40%
Faster PR Cycles
100%
Remote Ready

Professional Experience

7+ years building fintech and enterprise systems across payments, real estate, and e-commerce

🚀 Currently Working On

🔧Pendo Analytics integration
🌍International expansion readiness for UK/Ireland markets
🤖Championing AI-assisted development practices

Global Payments Inc.

Software Developer
April 2022 - Present

Genius Retail POS

January 2025 - Present
Implemented Pendo Analytics and OneTrust Cookie Consent across a portal serving 22,000+ merchants, integrating via postMessage-based iframe micro-frontend architecture
Integrated analytics into Angular microfrontends, leveraging cross-team expertise
Implementing international authentication solutions for UK/Ireland market entry using Azure AD B2C
Serve as team GitHub Copilot SME, introducing AI-assisted development workflows that reduced PR cycle time by 40%+
Collaborate with stakeholders to ensure first-time-right delivery

Heartland Retail POS

January 2024 - January 2025
Maintained complex legacy codebase (React.js class components within Backbone.js views)
Delivered critical bug fixes and system stability improvements while managing technical debt

Heartland Retail Online

April 2022 - January 2024
Developed features integrating e-commerce with POS using TypeScript, Node.js, and Angular
Evolved from backend to full-stack role, gaining Angular proficiency and UI expertise
Optimized CI/CD pipelines with GitHub Actions for streamlined AWS deployments

Homes.com

Software Developer
January 2019 - April 2022

Full-Stack Development

January 2019 - April 2022
Transitioned from Node.js microservices to C#/.NET full-stack development following CoStar Group acquisition
Built RESTful APIs, contributed to migration from monolithic ColdFusion to scalable Node.js microservices architecture
Implemented Kubernetes logging systems and database integrations (MongoDB, SQL Server, Solr)

Consistent Impact Across Teams

Across 3 teams at Global Payments, I shipped features used by 22,000+ merchants, contributed to international market expansion, and introduced GitHub Copilot workflows that cut PR cycle time by 40%+.

Want to Learn More?

Download my resume for a complete overview of my experience and skills.

Download Resume

Technical Skills

Modern full-stack technologies with a focus on scalability and maintainability

Languages

Core programming languages I use daily

JavaScript

6+ years
5/5

TypeScript

6+ years
5/5

C#

4+ years
5/5

SQL

6+ years
4/5

Frameworks

Modern frameworks for building robust applications

Express.js

6+ years
5/5

Hapi.js

6+ years
5/5

Node.js

6+ years
5/5

.NET

4+ years
5/5

React

6+ years
4/5

ASP.NET Core

4+ years
4/5

Bootstrap

6+ years
3/5

Angular

2+ years
3/5

Material-UI

2+ years
3/5

Infrastructure & DevOps

Infrastructure and deployment expertise

CI/CD

4+ years
4/5

Docker

3+ years
4/5

GitHub Actions

3+ years
4/5

Linux

6+ years
3/5

Nginx

5+ years
3/5

AWS

3+ years
3/5

AWS Lambda

2+ years
3/5

Kubernetes

2+ years
2/5

Azure

1+ year
2/5

Datadog

1+ year
2/5

Terraform

1+ year
2/5

Development Tools

Essential development and workflow tools

Git

6+ years
5/5

npm

6+ years
5/5

Postman

6+ years
5/5

Swagger/OpenAPI

6+ years
5/5

VS Code

6+ years
5/5

Jest

5+ years
5/5

Visual Studio

4+ years
4/5

Bash

4+ years
3/5

Data & APIs

Database and API integration technologies

REST APIs

6+ years
5/5

MongoDB

6+ years
4/5

SQL Server

6+ years
4/5

MySQL

5+ years
4/5

Amazon SQS

2+ years
3/5

Firebase

2+ years
3/5

RabbitMQ

2+ years
3/5

Redis

2+ years
3/5

Development Practices

Agile/Scrum Development
Test-Driven Development
Code Review & Mentoring
AI-Assisted Development (GitHub Copilot, Claude Code)
Legacy System Modernization
Cross-Team Collaboration
Point-of-Sale (POS) System Development
E-commerce Platform Architecture
Real Estate Technology Solutions
Payment Processing Integration
Continuous Integration/Continuous Deployment (CI/CD)
Performance Optimization & Monitoring

🤖 AI-Forward Development

Embracing modern AI tools to enhance productivity, code quality, and team collaboration while maintaining engineering best practices

Key Projects

Professional achievements showcasing technical leadership and business impact

Enterprise Analytics Integration

Global Payments Inc.
2025

Full-stack implementation of Pendo Analytics and OneTrust Cookie Consent across a portal serving 22,000+ merchants, integrated via postMessage-based iframe micro-frontend architecture.

Business Impact

Analytics and cookie compliance deployed across 22,000+ merchant portal with zero platform downtime

Key Highlights

  • postMessage iframe micro-frontend integration
  • Cross-team collaboration and expertise leveraging
  • First-time-right delivery methodology

Technologies

AngularTypeScriptC#/.NETPendoOneTrust Cookie Consent

E-commerce POS Integration Platform

Global Payments Inc.
2022-2024

Developed comprehensive features integrating e-commerce systems with point-of-sale solutions, enabling seamless omnichannel retail experiences.

Business Impact

Streamlined retail operations for thousands of merchants

Key Highlights

  • Backend to full-stack role evolution
  • CI/CD pipeline optimization
  • Complex system integration management

Technologies

TypeScriptNode.jsAngularAWSGitHub Actions

Legacy System Modernization

Homes.com
2019-2021

Contributed to migration from monolithic ColdFusion system to scalable Node.js microservices architecture, improving system performance and maintainability.

Business Impact

Reduced system complexity and improved scalability

Key Highlights

  • Contributed to monolithic-to-microservices migration
  • Cross-platform technology transition
  • Database integration and optimization

Technologies

Node.jsMongoDBSQL ServerKubernetes

Lehmann Digital — Multi-Tenant Client Portal

Lehmann Digital (Founder)
2024–Present

Founder-built SaaS client portal from scratch. Multi-tenancy via shared database with tenant-scoped rows, JWT authentication, REST API in Go/Gin, Next.js frontend.

Business Impact

Serves freelance clients with a branded, secure portal — built and deployed entirely by one engineer.

Key Highlights

  • Multi-tenancy via shared database with tenant-scoped rows
  • JWT authentication with Go/Gin REST API
  • Full-stack solo build: Railway backend, Vercel frontend, Cloudflare DNS

Technologies

GoGinPostgreSQLNext.jsRailwayVercelCloudflare
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Consistent Value Delivery

Each project reflects real business impact: shipping to 22,000+ merchants, building production systems as a solo founder, and improving developer workflows at scale.

Discuss Your Next Project

Articles & Insights

Exploring AI collaboration, work-life balance, faith-driven development, and lessons learned from modern software engineering

View All Articles

Get In Touch

Currently exploring senior full-stack and lead engineering roles. Open to remote positions in fintech, SaaS, or enterprise software. I also enjoy connecting with developers on technical challenges — feel free to reach out.

Let's Talk Code

Working on a fintech product or enterprise system? I'm happy to discuss architecture, payment integrations, or how AI tooling can accelerate your team's workflow.

Email

contact@patricklehmann.io

Best way to reach me

LinkedIn

linkedin.com/in/patlehmann

Professional network and experience

GitHub

github.com/patlehmann1

Code repositories and projects

Location
Palm Bay, FL
Time Zone
EDT (UTC-4)
Get In Touch

Built with Next.js, TypeScript, and Tailwind CSS •Demonstrating modern development practices