I'm an operations research analyst in defense cost estimating, with three years of life-cycle cost estimates, earned value and schedule analysis for Navy aviation acquisition programs. I build open-source tools for that work, made for the way it actually gets done: in Excel, by a team, with numbers someone has to defend.
cost-core runs a cost shop's monthly analysis straight from Excel: cost risk and the P80, EVM forecasts from a spreadsheet or an IPMDAR delivery, DCMA 14-point schedule checks, JCL, learning curves, AoAs and portfolio choice. Every run writes a report.xlsx and a brief.pptx, and nothing leaves your machine. Try pip install cost-core, then ce-core demo cost-risk.
xlgit is git diff and merge for Excel. Two people edit the same workbook on their own branches, and git merges it cell by cell while keeping charts, tables, pivot tables and macros. Try pip install xlgit, then xlgit demo.
Outside my own projects, I've had a bug fix merged into SciPy (float32 accuracy in mannwhitneyu) and tests merged into pandas.
MS in Systems Analysis from the Naval Postgraduate School, BS in Information Systems from UMBC. These are personal projects, built on my own time and not endorsed by the Navy, the Department of Defense or any employer. Find me on LinkedIn.