# Documentation > Selected Engineer ApS work demonstrating Documentation — the achievements that prove it. - [Enhanced data security by implementing 1,000 RBAC rules for developers, application instances, PostgreSQL, MS SQL, and other Linux servers, preventing unauthorized access; documented with Ansible automation.](https://platform.engineer.company/portfolio/enhanced-data-security-by-implementing-1-000-rbac-14/) - [Improved team communication and collaboration by implementing Slack, Mattermost, 1Password, and Jira, saving 8,000 hours of labor.](https://platform.engineer.company/portfolio/improved-team-communication-and-collaboration-by-implementing-slack-34/) - [Authored 578 go‑task automation targets spanning native, Docker and HTTPS dev modes, linting, testing, database and deployment.](https://platform.engineer.company/portfolio/authored-578-go-task-automation-targets-70/) - [Set a zero‑warnings quality bar across six languages — Go, TypeScript, SQL, Python, Shell and Markdown — enforced by pre‑commit hooks.](https://platform.engineer.company/portfolio/set-a-zero-warnings-quality-bar-across-six-79/) - [Built the repository's guard engine — 268 registered commit checks, 277 lint rules and 15 custom ESLint rules — plus 146 tests of the guards themselves, so the build holds the standard, not review.](https://platform.engineer.company/portfolio/built-the-repository-s-guard-engine-of-268-checks-95/) - [Established a continuous security programme — code scanning, DAST, dependency and vulnerability checks, SBOM generation, secret scanning and SHA‑pinned actions — alongside 21 written security audits.](https://platform.engineer.company/portfolio/established-a-continuous-security-programme-104/) - [Built the company's own infrastructure as 19 Ansible playbooks and 34 roles across 12,065 lines of YAML, converging a live host to a declared state with every play idempotent.](https://platform.engineer.company/portfolio/built-the-companys-infrastructure-as-code-108/) - [Built encrypted off‑host backups on restic with retention pruning, an integrity check and a monthly automated restore drill, then audited the recovery position and wrote down the gaps rather than leaving them to be found during an incident.](https://platform.engineer.company/portfolio/built-encrypted-backups-with-a-monthly-restore-drill-114/) - [Built seven read‑only reporting roles that render a live host to Markdown — facts, access, git, metrics, traffic, security and provider inventory — under a rule that no number is printed the run did not measure.](https://platform.engineer.company/portfolio/built-seven-read-only-host-reporting-roles-120/) - [Wrote a scope rule into the repository after a restructure carried another company's inventory, firewall allowances and prose into it — and kept the quarantined residue under the secret scanner rather than excluding it.](https://platform.engineer.company/portfolio/wrote-a-scope-rule-after-a-credential-leak-124/) - [Built a commit gate of 22 one‑line linters plus five that earn a paragraph, with no warning tier and no inline suppressions permitted, covering HTML, CSS, JavaScript, Python, YAML, Markdown, shell, links, spelling, secrets and typography.](https://platform.engineer.company/portfolio/built-a-22-linter-commit-gate-127/) - [Brought 10,242 lines of quality‑gate JavaScript under a formatter and a linter after establishing it was the largest body of code in the repository and the only one nothing read, fixing 13 findings and suppressing none.](https://platform.engineer.company/portfolio/brought-the-quality-gate-code-under-a-linter-143/) - [Selected every rule the Python linter has as an error, working through 1,815 findings to reach zero, with each of the few exemptions carrying a written reason and two of them backed by a checker instead of a comment.](https://platform.engineer.company/portfolio/enabled-every-python-linter-rule-as-an-error-147/) - [Found the commit hooks and the quality gate running different checks while a document promised they were the same, by comparing the two lists in a test — the five that only ever ran by hand were the ones reading the CV prose.](https://platform.engineer.company/portfolio/found-the-commit-hooks-and-the-gate-disagreeing-150/) - [Wrote a parser that reads the real 7,308‑line C header and verifies every call site, every enum constant and that every pointer‑owning class is final, after a hand‑written placeholder header let calls to three removed functions compile, link and crash.](https://platform.engineer.company/portfolio/wrote-a-parser-that-verifies-every-ffi-call-site-157/) - [Audited 644 Rust crates for licence compatibility on every build, and proved the check fires by rewriting one crate's licence and by moving the pinned core revision without regenerating.](https://platform.engineer.company/portfolio/audited-644-rust-crates-for-licence-compatibility-163/) - [Held four repositories to one history standard — conventional, emoji‑free, no attribution trailers, enforced by a commit‑message hook — alongside 46 instruction documents that govern how the work is done.](https://platform.engineer.company/portfolio/held-five-repositories-to-one-history-standard-165/)