MATT JI // Gutach im Breisgau / Freiburg, Germany (Remote)
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Matt Ji

Senior Systems & Infrastructure Engineer

Go • NixOS • Distributed Systems • Energy & Quantitative Infrastructure

Systems engineer with a background in engineering, quantitative economics, and energy systems (Colorado School of Mines & University of Freiburg). I design concurrent Go services, declarative NixOS fleet infrastructure, and quantitative data pipelines. Experienced managing risk and telemetry across $100M+ in renewable capital assets.

Renewable Portfolio Ops: $100M+
Engineering Alma Mater: Mines & Freiburg
Primary Stack: Go & NixOS
Legal Status: US & German PR
• Status: US Citizen · German Permanent Residence (Niederlassungserlaubnis)
• Languages: English (Native) · German (B2)
• Availability: Notice period: Flexible / Available on short notice
✉ Email Me Contact Form GitHub Profile LinkedIn
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Core Systems & Fleet Infrastructure

Deterministic Go servers, append-only event ledgers, and zero-drift declarative Linux fleets.

[ ALL CASE STUDIES → ]

Multi-Host Declarative NixOS Infrastructure

NIXCONFIG
Personal Infrastructure Fleet · Active

Production-grade, fully reproducible multi-host fleet (NAS, workstations, cloud endpoints) managed with Nix Flakes. Features a custom SSH Certificate Authority with automated rotation, age/SOPS secret encryption, automated self-upgrades, and a Taskfile control plane.

• Zero manual server configuration or configuration drift
• Short-lived SSH certificates instead of authorized_keys clutter
• ZFS/Btrfs storage, ZRAM tmpfs IO diet, and hermetic CI/CD automation
#NixOS #Nix Flakes #SSH CA #SOPS / Age #Tailscale #Taskfile

Bountystash: Deterministic Work Engine

BOUNTYSTASH
Creator & Systems Architect · 2024 — Present

Thin, server-rendered Go application turning unstructured task requirements into immutable, content-addressed specifications. Features append-only event sourcing, a keyboard-first terminal UI, and curl-friendly endpoints.

• Single-binary deployment with sub-millisecond route resolution
• Content hashes and projection quotient hashes for tamper-evident versioning
• Dual surface: markdown for agents, clean HTML for browsers, TUI for humans
#Go #PostgreSQL #Nix Flakes #TUI #HTML
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Algorithmic State Machines & Research

Novel radix encodings, bounded per-step work stream sensing, and tokenization research.

fibtransponder: Fibonacci Streaming State Machine

GO RESEARCH BASELINE
Research & Implementation (Go) · 2026

An experimental tokenization and semantic sensing substrate built around a Fibonacci-radix streaming state machine (FSVM). Evaluates bounded per-step work bitstream ingestion, structural calibration via adjacency width, and Zobrist hash seed tables.

• Canonical thesis: structural calibration via adjacency width is demonstrated; width selects locality sensitivity
• Corpus falsification: proved that seed-only Zobrist calibration does not create detector diversity
• Sensitivity shift: varying adjacency width triggers a demonstrable prose-first to code-first transition
#Go #State Machines #Fibonacci Radix #Zobrist Hashing #Bitstream Analysis

Core Technical Arsenal

Systems & Concurrency (Go / Python)

Go (Golang) · Concurrency & Channels · Kafka & Event Streaming · PostgreSQL · Redis · gRPC & REST APIs · State Machines

Declarative Infrastructure & Linux

NixOS Fleets · Nix Flakes · SSH Certificate Authority · SOPS / Age Encryption · Docker & Containers · ZFS / Btrfs · Linux Kernel / ZRAM

Energy, Finance & Domain Modeling

Quantitative Asset Valuation · Solar Telemetry Reconciliation · Algorithmic Risk Models · Bank Audit Reporting · Typst Typesetting Engine

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Clean Energy & Quantitative Asset Scale

High-stakes commercial asset steering, dynamic financial modeling, and bank-audited telemetry.

Clean Energy Asset & Telemetry Platform

O3 ENERGY & FRAUNHOFER ISE
Lead Operations @ O3 Energy · 2016 — 2020

Led data architecture and commercial asset steering for a solar energy portfolio exceeding $100M+. Built dynamic quantitative valuation and yield models under bank audits, automated mobile field data capture, and structured counterparty risk hedging.

• Governed quantitative operations across $100M+ in capital assets
• Coordinated technical due diligence across M&A transactions with institutional lenders and tax equity partners
• Automated laboratory instrumentation and numerical solar data processing in C++ and Python during graduate research at Fraunhofer ISE
#Python #PostgreSQL #Time-Series Data #Docker #Financial Due Diligence

Deterministic Typst Resume Engine

ANTIGRAVITY WORKFLOW
Build Pipeline & Typesetting · Active

A local build pipeline compiling structured JSON into pixel-perfect A4 PDFs with Typst. Enforces geometric typographic ratios (φ = 1.61803) with sub-second compilation, replacing LaTeX and browser-based PDF toolchains.

• One source of truth across the PDF resume, cover letters, and the web portfolio
• Hermetic compilation without runtime Node.js or browser headless overhead
#Typst #JSON Schema #Bitstream Charter #Deterministic PDF
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Education & Research Roots

M.Sc. Renewable Energy Management

2011 — 2014

Albert-Ludwigs-Universität Freiburg (Grade: 1.8)

University Portal →

B.S. Petroleum Engineering

2006 — 2010

Colorado School of Mines (Minors: Economics & Public Policy)

School of Mines Portal →

How I Build

Reproducibility is non-negotiable

If an infrastructure state, document build, or service binary cannot be built deterministically from code, it doesn't truly exist. Declarative NixOS flakes and locked dependencies prevent an entire class of production failures.

Domain depth beats generic engineering

Writing code is only half the battle. Understanding financial yield formulas, physical energy systems, or bitstream locality sensitivity prevents architectural mistakes before the first line of SQL is written.

Keep the runtime lightweight

Low-latency systems come from sensible fundamentals: compiled Go services, clean data models, server-rendered layouts, and respecting network envelopes like the 14KB rule.

Ready to build? Reach out for systems, backend, and infrastructure advisory.
matt@bountystash.com GitHub Profile