David Hjelle Email & Phone Number

Moorhead, Mn, Us

Moorhead, Mn, Us

Moorhead, Mn, Us

• Designed and implemented a virtualized HTML data grid for IconCMO, featuring: • realtime search with a custom trigram index • good performance with 100k+ rows of data • user-specified filtering using a [custom query language](https://gitlab.com/dahjelle/array-filter.js-2021-11-11) • user-selectable sorting and column selection • developer-customizable cells using lit-html • comprehensive tests • printing and exporting to PDF, Excel, and HTML • handles almost all data display within IconCMO.• Given several talks to a local developer meetup, including: • [An architecture you won't regret](https://gitlab.com/dahjelle/an-architecture-you-wont-regret-as-much-2022-04-14) • [A overview of a MongoDB-inspired query language in 65 lines of JavaScript](https://gitlab.com/dahjelle/array-filter.js-2021-11-11) • [A Summary of _The Effective Engineer_](https://gitlab.com/dahjelle/the-effective-engineer-review-2021-02-11)• Volunteered and substitute taught at Emerging Digital Academy, a local coding bootcamp.• Designed and implemented a custom JavaScript SVG charting library for IconCMO.• Educating co-workers in programming topics on a daily basis, from security to algorithms to development and testing strategies.• Architected and led implementation of Icon Rubix, the first real-time church management software. Including: 1) implemented a collaborative text editing conflict-free replicated data type (CRDT) based on causal trees, 2) introduced and taught new technologies including Node.js, CouchDB, React, and GraphQL, and 3) improving architecture and development environment for development efficiency. (Now discontinued.)• Designed, architected, implemented, and documented the [IconCMO API](https://www.iconcmo.com/church-software-api/).

Ithaca, Ny, Us

• Developed a first-generation "hinge" robot capable of cubic truss traversal and preliminary manipulation.• Implemented a genetic algorithm in C++ to provide reconfiguration instructions.• Presented two papers at International Conference on Reconfigurable Mechanisms and Robots (ReMAR) in London, England in June 2009.• Completed thesis, several classes, papers (see list below), and other educational requirements.

• Designed and implemented custom human-machine interface (HMI) software for third party clients, primarily P&G's IAMS Pet Foods.• Developed solutions utilizing a variety of technologies, including FactoryLink, RSView32 and SE, Oracle, SQL Server, Visual Basic, and C.• Provided direct customer support, including on-site startup support and 24/7 telephone support.• Initiated and led a group documentation improvement and organization process. Developed standard documentation organization hierarchy. Wrote several new documents and revised others.

Seoul, Kr

• Researched causes of compact disc (CD) material failure at high rotational velocities.• Designed and built test apparatus capable of replicating failure conditions, including extensive safety equipment and observational instrumentation.• Tested and analyzed CDs during failure conditions.• Prepared and delivered detailed report and oral presentation on project results.• Programmed several Visual Basic for Excel macros to summarize and chart CD testing data.

Seoul, Kr

• Helped convert statistical process control software from existing DataLyzer to Applied Statistics, Inc. (ASI) package.• Converted data files from old software to Applied Stats; created files for new DataPlay facility.• Resolved implementation issues at workstation and server levels.• Created four Visual Basic programs to circumvent constraints in ASI system, including SQL database interaction and involvement with DataPlay facility.• Learned, taught, and documented new software programs, both Applied Statistics and custom created programs.• Wrote complete documentation on results of work.

Fergus Falls, Mn, Us

• Updated, redesigned, and developed three multiple-user Microsoft Access database applications for system operators.• Improved database user interface; added security measures and industry-standard outage-length statistics; enhanced searching and data reporting facilities; implemented logging features.• Created new multiple-user phone dialing system with Microsoft Access.• Converted 3,000 phone numbers from old Macintosh dialing system to Windows-based system.• Improved and simplified office-to-substation modem communications for system engineers.• Wrote extensive documentation.

M.S., Mechanical Engineering: Dynamics And Controls

B.S.E, Mechanical Engineering, Computer Science

High School