What Do Software Engineers Do? Roles, Skills, and Salary Explained

Last Updated: March 2026

Any time you visit a website, use a mobile app, or interact with a digital product, you’re using software built by a software engineer. These professionals design, build, and maintain the systems that power modern technology.

According to the U.S. Bureau of Labor Statistics, employment of software developers and related roles is projected to grow about 15% from 2024 to 2034, much faster than the average for all occupations.

This guide explains what software engineers do, common job types, and what to expect in terms of skills and compensation.

What Is a Software Engineer?

A software engineer is a professional who designs, develops, tests, and maintains software systems. They write and review code, solve technical problems, and ensure applications function reliably, securely, and efficiently.

Software engineers work throughout the development lifecycle. This includes breaking down requirements into technical plans, building and testing features, debugging issues, and maintaining systems after they’re deployed. Depending on the role, they may be responsible for user-facing applications, backend systems, infrastructure, or performance optimization.

You may also see the title “software developer” used in similar contexts. In many organizations, “software engineer” and “software developer” are used interchangeably, and their responsibilities largely overlap. If you’re wondering what a software developer does, the answer is often very similar to what software engineers do: writing code, building features, troubleshooting issues, and improving performance. The exact title typically depends more on company preference than on major differences in daily work.

Do Software Engineers Only Code?

Writing code is a core part of a software engineer’s job, but it’s far from the only responsibility. In most roles, engineers spend just as much time thinking, planning, and collaborating as they do actively coding. Common responsibilities usually include:

• Problem Solving: Identifying and analyzing problems, then designing solutions through code.

• Collaboration: Working with designers, project managers, and other engineers to bring software projects to life.

• Testing and Debugging: Creating and running tests to ensure functionality and fixing any errors that arise.

• Communication: Clearly explaining technical concepts to both technical and non-technical audiences.

Software engineering is more than just coding; it's about applying structured thinking and teamwork to build solutions.

What Do Software Engineers Do

Software engineers design, build, test, and maintain software systems. They write and review code, solve technical problems, collaborate with teams, and ensure applications run efficiently and securely.

A software engineer may spend part of their day planning new features, reviewing technical requirements, or discussing solutions with teammates or other cross-functional teams. The rest of their day could be spent writing and reviewing code, fixing bugs, or improving existing systems to make them faster or more reliable.

What software engineers do can also change depending on the stage of a project. Early on, the focus is usually on design and problem-solving. As development progresses, testing, debugging, and optimizing software become more important.

Types of Software Engineers

Most software engineers fall into one of two broad categories: application developers or systems developers. While both roles involve building and maintaining software, they focus on different parts of how technology works.

1. Application Developers

Application developers build software that users interact with directly, such as websites, mobile apps, and desktop programs. Their work is centered on functionality, usability, and delivering features that solve user problems.

2. Systems Developers

Systems developers work on the underlying systems that support those applications. This can include operating systems, networks, and software that interact closely with hardware. Their goal is to ensure that applications run efficiently, securely, and reliably.

The table below highlights the key differences between application developers and systems developers.

Application Developer vs. Systems Developer

What Skills Do Software Engineers Need?

To succeed in this field, software engineers need a mix of technical programming skills and problem-solving and communication abilities.

1. Common Programming Languages

While the exact languages vary by role, most job openings for software engineers look for the following popular programming languages:

• JavaScript: widely used for web applications

• TypeScript: often used alongside JavaScript for larger, more structured applications

• Python: common in backend development, data-related work, and automation

• Java: used in enterprise and large-scale systems

• C++: associated with systems-level and performance-critical software

• SQL: used to work with databases and manage application data

These languages appear most often in software engineering job descriptions across industries.

2. Concepts and Technical Skills

Besides specific languages, employers frequently look for engineers who have a good grasp of:

• Core programming concepts and logic

• Object-oriented programming (OOP) concepts

• Algorithms and data structures

• Version control tools (such as Git)

• APIs and system integrations

• Databases and data management

• Testing, debugging, and troubleshooting

• Agile development practices (including Scrum)

These fundamentals help engineers write reliable code and work effectively within teams.

3. Soft Skills

Technical ability alone isn’t enough. Software engineers also rely on:

• Analytical thinking to break down complex problems

• Collaboration when working with design, product, and business teams, as well as other engineers

• Clear communication to explain technical concepts

How Generative AI Is Changing What Software Engineers Do

Generative AI, or GenAI, is becoming a practical part of how software engineers work today. Tools like Cursor, GitHub Copilot, and other AI-powered code assistants are commonly used to speed up tasks such as writing boilerplate code, catching errors, and improving documentation.

Rather than replacing engineers, these tools help increase productivity. Engineers still decide what to build, how systems should work, and whether code is reliable, secure, and scalable. Reviewing, refining, and validating AI-generated suggestions remains a crucial part of the job.

As a result, the day-to-day work of software engineers is gradually shifting. With routine tasks taking less time than before, engineers can now focus more on problem-solving, software design, and collaboration.

Does Software Engineering Require Math?

Software engineering does not require advanced math skills for most roles. While math is part of the foundation of computer science, day-to-day software engineering tasks rely more on logical thinking and problem-solving than on complex calculations.

That being said, some specific areas of software engineering use more advanced math. Fields like machine learning, data science, graphics programming, and game development may involve complex math concepts like linear algebra, statistics, or calculus.

Is Software Engineering a Good Career?

Yes! Software engineering can be a lucrative and rewarding career choice. Here's why:

• High Demand & Job Growth: Skilled software engineers are in high demand, according to the U.S. Bureau of Labor Statistics. This translates to strong job opportunities and long-term career stability.

• Creative & Challenging Work: Software engineering is more than just writing code. It often involves solving complex problems, optimizing systems, and building solutions that people and businesses rely on.

• Competitive Salaries: Most software engineering roles offer above-average salaries, depending on experience level, specialization, and location.

• Flexible Work Environments: Software engineers often have access to flexible schedules and remote/hybrid work opportunities.

If you enjoy problem-solving, are passionate about technology, and want a stimulating career with excellent earning potential, software engineering might just be the perfect fit for you!

Software Engineering Jobs and Salaries

Thanks to strong industry demand and their own technical expertise, skilled software engineers who focus on applications and systems are compensated well for the value they deliver. Companies headquartered in tech hubs like New York City and California, in particular, offer in-person and remote coding career opportunities with even higher average earnings, while software engineers remain in demand at companies of all sizes nationwide. According to Indeed, the average annual salary for software engineers in the U.S. is $130,501.

Factors such as total professional experience, industry, and geographic location all influence earnings. For example, senior-level engineers working on complex systems or in heavily regulated industries (such as finance or healthcare) may earn substantially more than those in entry-level or generalist roles.

Software engineering can also include a wide range of other roles, such as:

• Mobile app developers

• Software architects

• Quality assurance (QA) engineers

• Database administrators

Software is used in nearly every industry, so job opportunities exist well beyond tech organizations, giving software engineers flexibility in choosing where and how they work.

Where Do Software Engineers Work

Software engineers work in a wide range of industries, reflecting how deeply software is embedded in modern organizations. From large technology companies to small businesses and public institutions, software engineering roles exist wherever digital systems are needed.

According to Lightcast™, there are over 1 million open software engineering roles in the United States, making them one of the most in-demand jobs. As a result, software engineers can find opportunities in industries such as:

• Technology

• Finance

• Healthcare

• Government

• Retail and e-commerce

• Transportation and logistics

Many software engineers work in traditional office environments, while others work remotely or in hybrid roles.

Software Engineering Certifications and Courses

Formal education isn't always mandatory for software engineers, but certifications and courses can significantly enhance your skill set and marketability. Consider exploring options like:

• Coding Bootcamps: Some online coding bootcamps provide immersive training, equipping you with core coding skills in a shorter timeframe.

• Online Courses: Platforms like Coursera and edX offer in-depth courses on specific programming languages, frameworks, and software development methodologies.

• Industry Certifications: Certifications like CompTIA A+ or Microsoft Azure Fundamentals validate your expertise in specific areas and can impress employers.

These resources can help you gain valuable knowledge, build a portfolio, and stay up-to-date with the latest technologies in the ever-evolving world of software engineering.

Every Industry Needs Software

With the right skills, a software engineer can work in nearly any industry. While tech organizations lead the pack in hiring software developers, nearly every industry needs software, including government, nonprofit, healthcare, finance, and transit and logistics companies. These organizations use software for everything from managing data and automating processes to improving customer experiences and maintaining secure systems.

Because software plays such a central role in modern operations, software engineering skills are highly transferable. This flexibility allows professionals to move between industries or apply their skills to various causes and fields that align with their interests.

FAQs

What exactly does a software engineer do?

Software engineers are the builders behind the software we use every day. They solve problems and create innovative solutions through code. This involves tasks like designing applications, writing code, testing and debugging software, and collaborating with other professionals to bring projects to life.

What are the skills needed to be a software engineer?

Strong problem-solving, analytical thinking, and communication skills are crucial. Software engineers also need expertise in programming languages, frameworks, and software development methodologies. Depending on your specialization, knowledge of databases, user interface (UI) design, or cloud computing may also be beneficial.

Do software engineers do coding?

Absolutely! Writing code is a core function of software engineering. They use code to build the functionalities and features of software applications. However, the role involves more than just coding. Software engineers also design, test, debug, and maintain software, ensuring it works effectively and efficiently.

Since what software engineers do often depends on the tools and technologies they use, choosing the right programming language is an important first step. Explore some of the most in-demand programming languages to learn and how they align with different software engineering roles.