Computer Engineering graduate (B.S., Cum Laude, Capitol Technology University) who builds and supports systems end to end. I write embedded C and ARM assembly for microcontrollers, design databases, build Python and Django applications, and keep production networks running for more than 100 organizations as a Level II technician. Cisco CCNA and CompTIA Security+ certified.
A tamper evident voting ledger. Each vote is a block chained to the last by a SHA‑256 hash, so changing any recorded vote breaks the chain. A Django web app collects votes and shows the tally, the full ledger, and a live integrity check.
Four Raspberry Pi Pico builds: a PIR motion activated light, a servo latch with a cancelable countdown, an I2C driver integration for a Bosch BME280 environmental sensor, and GPIO control written directly in ARM Thumb assembly.
An 8 table human resources schema with 7 foreign keys, PL/SQL triggers that stamp every change with the user and date, and views that use joins and the LEAD window function to build a full employment history from pay records.
Solutions for root finding (bisection, Newton, secant), linear systems (Gaussian elimination, LU and Cholesky decomposition), interpolation and curve fitting (Lagrange, cubic splines, least squares), and numerical integration, with plotted results.
A five module Zero Trust Network Access lab with Python scripts that collect access logs and flag anomalies.
Hardening an AWS account with Terraform: KMS encryption with key rotation, a multi region CloudTrail, VPC flow logs, IAM controls, and CloudWatch alarms, measured against the CIS AWS Foundations Benchmark with Prowler.
Browser based tools built on the Anthropic API that draft new tickets and client closing emails from a technician's notes, with image upload, step logging, and an editing panel. Built for day to day support work at a managed service provider.
A console game that loads its word list from a file, avoids repeating words, and keeps a scoreboard of players and scores using structs and file I/O.
Resolve 20 to 30+ escalated tickets a day for 100+ client organizations. Migrated Domain Controllers to Azure, traced network outages to root cause, and wrote knowledge base articles that cut recurring issues by 50%.
Supported Active Directory systems and end user devices on a county government network serving 200,000 users.
Troubleshot radio frequency coverage through eRF testing, executing structured test plans and documenting findings for engineering stakeholders.
Diagnosed hardware issues and supported 500+ users across multiple sites, cutting average response time by 25%.
Rebuilt and repaired computer hardware across 150 computers and 10 servers at 5 sites.
jhall-robinson@outlook.com
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