Carl Edward Lyons

Multi‑disciplinary software developer with 5+ years experience building scalable SaaS infrastructure, event-driven billing systems, and data-intensive backend services, plus 3 years experience in quality assurance and product development; skilled in designing reliable distributed systems where correctness, consistency, and financial-grade accuracy are critical, including client–server reconciliation and production data pipelines; proven collaborator and technical leader with experience driving complex projects from architecture through deployment in collaboration with engineering and business stakeholders.

Skills

• Languages:

  Python

  | JavaScript

  | TypeScript

  | C#

  | C++

  | HTML

  | CSS

  | PHP

  | Bash

  | SQL

  | MATLAB

  | R

• Frameworks:

  Django

  | FastAPI

  | NestJS

  | React

  | Angular

  | SvelteKit

  | Gatsby

  | Laravel

  | .NET

• Databases:

  PostgreSQL

  | MySQL

  | SQLite

  | IndexedDB

  | Redis

• DevOps:

  Git

  | GitHub

  | GitHub Actions

  | Docker

  | Terraform

• Other Tools:

  Grafana Loki

  | Sentry

  | PyTest

  | Jest

  | Vitest

  | Playwright

  | Figma

  | LangSmith

Experience

Rohirrim, Toronto

| Senior Full-Stack Developer

| 0.5 years

• Architected and delivered distributed data-processing workflows for large-scale structured and unstructured datasets, enabling low-latency analytics and real-time insights delivery
• Redesigned distributed orchestration workflows for LLM-driven services, reducing inference and response-generation costs by up to 90% while improving operational scalability
• Led migration from tightly coupled prompt-context injection to tool-driven contextual workflows, resolving mission-critical scalability bottlenecks and improving service maintainability

Batched, Hamilton

| Co-Founder, Chief Technology Officer

| 1.5 years

• Architected and operated distributed SaaS infrastructure supporting 100+ zero-downtime on-demand production releases using blue-green deployments, backward-compatible schema migrations, and progressive delivery strategies
• Designed modular distributed service architecture for multi-tenant commerce and operations systems, supporting tenant-isolated deployments capable of processing 1M+ daily events and extensible multi-provider integration workflows
• Led development and delivery of a multi-tenant, white-label SaaS platform supporting commerce and operational workflows for food and beverage businesses, mentoring and coordinating 3 engineering teams of 3–6 developers

MRKTBOX, Hamilton

| Principal Software Developer

| 3.5 years

• Modernized legacy commerce infrastructure into a decoupled React/Python platform architecture, improving consistency, scalability, performance, and operational maintainability; designed and implemented subscription and recurring-order workflows
• Mentored junior developers and student engineering teams through production feature delivery and software architecture initiatives
• Designed probabilistic reconciliation workflows to consolidate 750+ customer accounts and 5k+ product records, improving sales-data consistency, operational accuracy, and search indexing quality

nVent, Milton

| Field Technician

| 2.5 years

• Mediated complex technical and operational concerns between engineers and contractors to ensure successful project delivery
• Performed quality assurance testing and troubleshooting of commercial‑industrial system controllers and high‑temperature power conductors; maintained a 0% failure rate on all serviced equipment

Education

McMaster University, Hamilton

| MSc, Psychology, Neuroscience & Behaviour

| Defence Pending

• Quantified echolocation spatial characteristics in developing big brown bats (Eptesicus fuscus)
• Prototyped audio analysis pipeline to aggregate and analyze data from 500+ GB of high‑sample‑rate audio
• Received Mitacs Globalink Internship grant to conduct research at the University of Southern Denmark, Odense

University of Waterloo, Waterloo

| BSc, Honours, Physics, Astrophysics Specialization

| Conferred

Volunteering

• Land Care Niagara, Niagara Falls:

  Conducted bat monitoring and community outreach

• Toronto Zoo, Toronto:

  Assisted "After Hours" community bat event

• Stewards of Cootes Watershed, Hamilton:

  Participated in environmental cleanup and organized fundraising events