# Reliability & Backups > Selected Engineer ApS work demonstrating Reliability & Backups — the achievements that prove it. - [Led the software development of a GIS map application, driving revenue growth by 10x and positioning the product as a primary data asset.](https://advisory.engineer.company/portfolio/led-the-software-development-of-a-gis-map-24/) - [Led the development, deployment, and support of over 30 GIS projects, demonstrating expertise in PostgreSQL, Bash, Python, JavaScript, GDAL, ArcGIS, PostGIS, and Mapbox technologies.](https://advisory.engineer.company/portfolio/led-the-development-deployment-and-support-of-over-35/) - [Streamlined CI/CD processes, saving 4,000 hours by introducing automation in software development pipelines.](https://advisory.engineer.company/portfolio/streamlined-ci-cd-processes-saving-4-000-hours-42/) - [Built a layered automated test suite — 981 Go tests, 543 frontend and browser specs, 494 SQL behavioural tests — with mutation testing, property‑based tests and an accessibility gate.](https://advisory.engineer.company/portfolio/built-a-layered-automated-test-suite-across-four-layers-94/) - [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://advisory.engineer.company/portfolio/established-a-continuous-security-programme-104/) - [Held the generator to 981 test cases at a 92% branch‑coverage floor with warnings treated as failures, and asserted idempotence by running the whole build pipeline twice from an empty file and requiring the second pass to change nothing.](https://advisory.engineer.company/portfolio/held-the-generator-to-964-tests-and-a-coverage-floor-145/) - [Adopted Swift 6 complete strict concurrency with no actors, bridging a blocking C event loop to the main actor through one producer, one consumer and one ordering — after establishing that a task per event loses the ordering the interface depends on.](https://advisory.engineer.company/portfolio/adopted-swift-6-strict-concurrency-over-a-c-event-loop-156/)