Part 1: From Switches to AI: Seven Decades of Software Coding(1950-2020)

 

Software coding has evolved from a niche scientific activity performed by mathematicians into the backbone of civilization. Over seven decades, coding has changed from manual wiring machines to directing AI agents with natural language. Each era emerged because hardware, economics, business needs, and human limitations forced new abstractions into existence.

This evolution follows a repeating pattern:

1. Hardware becomes more powerful
2. Software complexity explodes
3. Existing coding methods become unmanageable
4. New abstractions emerge to reduce complexity
5. Those abstractions eventually create new problems

The history of software coding is therefore a history of managing complexity.

1.    The Machine Code Era (1950s)

What Coding Looked Like

Computing began in the realm of physicists and mathematicians who programmed early computers - ENIAC, UNIVAC, IBM 701- by setting switches, patching cables, or writing raw binary instructions. Every operation was specified in the machine's native numeric language. A single addition required knowing the exact opcode, memory address, and register for the target architecture.

Example:

MOV A, 5
ADD A, 3

or even raw binary:

10110000 01100001

Programming was tightly coupled with hardware architecture.

Why This Era Emerged

Computers were extremely expensive and limited.

• Memory constraint (measured in kilobytes and access was very slow)
• CPUs were painfully slow and there was no abstraction layer

Therefore, every instruction mattered. People writing software were usually mathematicians, physicists, or electrical engineers working on military or scientific applications. Software itself was not viewed as a separate industry yet

Why It Declined

Machine-level coding became impossible to scale due to:

• Extremely error-prone
• Difficult to debug
• Hardware-dependent
• Poor portability
• Tiny productivity
• Extremely low availability of human resources

As computer adoption increased, businesses needed faster software development.

This created demand for higher-level languages.

2.    The High-Level Language Revolution (1957–1970s)

Key Languages

FORTRAN (1957), COBOL (1959), LISP (1958), ALGOL (1960), and other programming languages introduced the concept of writing programs in human-readable syntax that a compiler would translate to machine code. For the first time, a programmer could write X = Y + Z and trust the machine to handle the rest.

Programmers could now describe logic instead of hardware operations.

Example in FORTRAN:

DO 100 I = 1,10
SUM = SUM + I
100 CONTINUE

This was revolutionary.

Why This Happened

IBM's John Backus and his team proved with FORTRAN that a compiler could generate code nearly as efficient as hand-written assembly, shattering the prevailing belief that only humans could write tight machine code.

The number of computers exploded across government, universities, banks, insurance companies, and big businesses. The US Navy's need for portable business software drove COBOL's creation. Organizations needed programmers; hand-coding assembly was a bottleneck. Abstraction became economically necessary.

Why Some Early Languages Declined

FORTRAN

Still survives in scientific computing, but lost dominance because:

• Weak software engineering structure
• Limited modularity
• Poor readability for large systems

COBOL

Thrived in enterprise systems but declined due to:

• Aging workforce
• Rigid architecture
• Difficulty integrating modern systems

COBOL still runs an estimated 95% of ATM transactions worldwide. FORTRAN remains the language of high-performance scientific computing. These languages outlived nearly every paradigm shift that followed them.

3.    Structured Programming Era (1970s–1980s)

Edsger W. Dijkstra's 1968 letter "Go To Statement Considered Harmful" launched a movement. Programs riddled with GOTO jumps - spaghetti code - were becoming unmaintainable as systems grew. Structured programming insisted on control flow through loops, conditionals, and subroutines. C (1972), Pascal (1970), and later Ada embodied this discipline.

The "software crisis" of 1968 - named at the NATO Software Engineering Conference - described a pattern of massive cost overruns and project failures. Software complexity was outpacing human ability to manage it. Structured programming was the engineering response: impose discipline on chaos.

Core Idea

Software complexity had become chaotic.

Programs relied heavily on:

·        GOTO statements

·        Unstructured jumps

·        Spaghetti logic

Structured programming introduced:

·        Functions

·        Loops

·        Modular design

·        Cleaner control flow

Why This Emerged

Software systems became large enough that maintenance overtook initial development cost.

The industry realized:

“Code is read far more often than it is written.”

Major Rise Factors

Government and defense contracts (particularly the US DoD, which mandated Ada) enforced structured practices. Universities adopted Pascal as the teaching language of the 1970s, graduating a generation of developers who thought in structured terms.

Operating Systems Growth

Unix demanded portable, modular software.

C Language Success

C balanced performance, portability, and flexibility

It became the dominant systems programming language.

Rise of Software Engineering

Programming evolved from “craft” into an engineering discipline.

Why This Era Eventually Evolved Further

Structured programming solved flow-control chaos but not modeling complexity.

As applications became larger:

·        State management became difficult

·        Shared data became messy

·        Reusability remained limited

This led to object-oriented programming.

4.    Object-Oriented Programming (1980s–2000s)

Smalltalk (Xerox PARC, 1972) planted the seed; C++ (1983) and Java (1995) made it mainstream. Object-oriented programming organized software around objects - bundles of data and the methods that acted on them - rather than procedures. Inheritance, encapsulation, and polymorphism became the vocabulary of software design.

Java's "write once, run anywhere" promise, combined with the enterprise middleware boom of the late 1990s, made OOP the dominant paradigm in professional software. Design patterns (the Gang of Four book, 1994) canonized OOP best practices into a shared professional language.

Example:

class Car {
   void drive() {}
}

Why OOP Rose

Applications became massive (Enterprise software, GUIs, Databases, and Networking systems) and needed reusable components, better organization, and team scalability. Graphical interfaces mapped naturally to objects & events and OOP promised reusable architecture. Cherry on top of the cake was Java’s “Write Once, Run Anywhere” promise.

Why OOP Lost Its Dominance

Object-oriented programming never fully disappeared, but its dominance weakened over time. Deep inheritance hierarchies proved brittle. Shared mutable state caused bugs in multi-threaded programs. Functional programming evangelists demonstrated that many OOP "patterns" were workarounds for language limitations. Python, JavaScript, and Go all embraced OOP but declined to enforce it dogmatically.

Web Development Changed Priorities

Speed and flexibility became more important than perfect architecture.

This opened the door for scripting languages and lightweight development.

5.    The Internet and Scripting Era (1990s–2010s)

The Mosaic browser (1993) and Tim Berners-Lee's World Wide Web transformed computing's target. HTML, then JavaScript (1995), then PHP, Python, Ruby, and Perl became the languages of the new universal platform. Speed of delivery mattered more than raw performance; interpreted scripting languages thrived.

The internet transformed software from packaged products into connected services.

The speed of iteration became critical. Developers needed to build websites rapidly, deploy continuously, and update software instantly.

Startup Culture

Internet startups optimized for speed over perfection and developers could prototype rapidly using dynamic languages.

Open-Source Movement

Communities accelerated innovation dramatically. LAMP stack (Linux, Apache, MySQL, PHP/Python/Perl) became the default architecture for web startups. Google's search engine, built on Python and C++, proved that scripting and systems languages could coexist in world-class infrastructure.

Why Some Technologies Declined

PHP

Lost prestige due to inconsistent design, security issues, and poor code quality in early ecosystems. Though it still powers huge parts of the web.

Ruby on Rails

Declined because performance limitations, scaling challenges, JavaScript ecosystem dominance.

6.    The Agile, Cloud, and DevOps Era (2001–2020)

The Agile Manifesto (2001) rejected heavyweight waterfall processes in favor of iterative cycles, working software, and collaboration. Git (2005, Linus Torvalds) and GitHub (2008) turned version control into a social platform and collaboration layer. Linux proved that distributed contributors could produce enterprise-quality software without a corporate hierarchy.

The dot-com bust exposed the cost of year-long development cycles that produced software nobody wanted. Agile was a response to the mismatch between business speed and engineering process. Open source addressed the inefficiency of every company solving identical infrastructure problems from scratch.

Software stopped being a “product shipped occasionally.” It became continuously updated, Cloud-hosted, and Service-oriented.

Agile became so widely adopted that it lost precision - “we're agile" came to mean almost anything. DevOps and continuous delivery emerged as more specific practices. GitHub's acquisition by Microsoft (2018) and the explosion of npm, PyPI, and package ecosystems transformed open source from an ideology into the default substrate of all software.

Amazon Web Services launched S3 in 2006 and EC2 the same year, beginning the shift from owned servers to rented compute. Virtualization, containers (Docker, 2013), and orchestration (Kubernetes, 2014) made infrastructure programmable. YAML and JSON became as important as any programming language. The role of "DevOps engineer" and later "SRE" formalized the coding of operations.

Why This Happened

Internet scale became enormous. Companies like Google, Facebook, and Netflix needed systems that scaled globally, updated rapidly, and recovered automatically.

Startups needed to scale globally without capital for data centers. Enterprises needed to reduce the enormous cost of maintaining physical infrastructure. Moore's Law was slowing; distributed cloud computing offered a different axis of scaling horizontal instead of vertical.

Servers became programmable infrastructure. Short iterative development cycles replaced waterfall models. Businesses competed on release velocity.

Netflix's public migration to AWS (2008–2016) legitimized cloud for enterprises. The microservices movement fragmented monolithic applications into independently deployable services, creating demand for container orchestration. Serverless computing (AWS Lambda, 2014) pushed abstraction even further — developers wrote functions, not servers.

7.    Mobile-First and Cross-Platform Development (2008-2022)

The iPhone (2007) and the App Store (2008) created an entirely new software market. Objective-C, then Swift for iOS; Java, then Kotlin for Android. React Native (2015), Flutter (2018), and Xamarin promised to write once and deploy to both. Web apps fought back with Progressive Web Apps. The JavaScript ecosystem exploded: React, Angular, Vue competed to dominate the front end.

Why it arose

By 2012, mobile internet usage overtook desktop in many markets. Apps offered native experiences - cameras, GPS, touch - that websites couldn't match. The App Store's revenue model created a new economic layer: the app economy generated over $130 billion in 2020 alone.

What challenged it

The proliferation of frameworks produced "JavaScript fatigue”, developers struggled to keep up with the churn. Apple and Google's tight app store control sparked regulatory scrutiny. Web standards caught up: WebGL, WebAssembly, and PWA capabilities narrowed the gap between web and native experiences.

Why Agile, Cloud, and Mobile First Eras Produced New Problems

The software ecosystem became fragmented and overwhelmingly complex.

Developers now managed:

·        APIs

·        Containers

·        CI/CD pipelines

·        Microservices

·        Observability stacks

·        Security tooling

Engineering productivity began slowing under tooling complexity.

This sets the stage for AI-assisted development.

In Part Two of this write-up, I will cover the impact of AI on coding.