Charles Simonyi: Designing Code Around Human Intent at Intentional Software

Charles Simonyi spent decades shaping fundamental software tools before stepping out to rethink how programs are written. After steering the creation of widely used productivity applications during the rise of personal computing, he directed his attention toward closing the divide between business logic and executable code. In founding Intentional Software, Simonyi sought to modernize software construction by allowing human design concepts to lead the development process.

Foundations in Modern Computing

Simonyi began working with computers during secondary school in Budapest, taking a night shift at a laboratory housing a Soviet Ural II mainframe. After learning to program from an engineer, he constructed compilers and sold one to a state department. In 1966, he joined Regnecentralen in Denmark, contributing to the RC 4000 minicomputer control system alongside Per Brinch Hansen and Peter Kraft, as well as the GIER ALGOL compiler with Peter Naur.

Moving to the United States in 1968, Simonyi completed a degree in engineering mathematics and statistics at the University of California, Berkeley under Butler Lampson. Lampson subsequently recruited him to Xerox PARC. There, working with Lampson, Alan Kay, and Robert Metcalfe on the Xerox Alto computer, Simonyi co-developed Bravo, the earliest WYSIWYG document preparation tool, operational by 1974. Simonyi also earned a doctorate in computer science from Stanford University in 1977. His doctoral dissertation outlined meta-programming, a structural framework aimed at organizing engineering teams and formalizing technical communication, which introduced the variable naming standard known as Hungarian notation.

Building Applications at Microsoft

He began by overseeing the creation of a WYSIWYG word processor and went on to guide the development of Multiplan, Word, and Excel. Simonyi implemented a cross-platform deployment method dubbed the revenue bomb, in which programs operated on a virtual machine adapted for various computer platforms, although industry alignment on MS-DOS eventually reduced the necessity of this portability.

Within Microsoft, Simonyi served as one of the organization’s highest-ranking technical leaders. He introduced object-oriented programming methods developed during his tenure at Xerox PARC and instituted Hungarian notation across engineering teams. He also attempted to implement meta-programming as an organizational model for software production, though that specific team-structuring method did not succeed in practice. Later, within Microsoft Research, Simonyi shifted his investigative efforts toward a new development concept: intentional programming.

Transforming Code at Intentional Software

Simonyi departed Microsoft in 2002 to co-found Intentional Software alongside Gregor Kiczales. The enterprise was formed to commercialize intentional programming, an approach designed to minimize the time developers spend interacting directly with machine architecture and compilers. Instead, the methodology emphasizes capturing the operational intent of designers and subject-matter specialists.

The core technology developed at Intentional Software centered on language workbenches and domain-specific environments. In this system, software engineers first constructed an environment tailored to a particular business field, such as life insurance. Domain specialists, working with software developers, outlined program logic through What You See Is What You Get interfaces. An automated system translated these high-level descriptions and language rules directly into running code. Any subsequent modifications occurred within the visual interface rather than in manual source code edits. This structure decoupled functional business rules from underlying implementations, enabling systems to rewrite code automatically whenever technical implementation choices changed.

Intentional Software later expanded its tools into a broader platform aimed at enhancing productivity across engineering teams. Simonyi received the Wharton Infosys Business Transformation Award in 2004 for the industry impact of his technical work. In April 2017, Microsoft acquired Intentional Software, bringing Simonyi’s programming platform back into the company where his application development career had expanded decades earlier.