Software Developer job description and duties

Updated 16 September 2026 · 2 min read

A software developer builds and maintains the applications an organisation or its customers rely on. Depending on the team, a developer may work on web applications, mobile apps, internal systems or integrations between services. The duties below describe what most developer posts involve, whatever the language or framework.

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Purpose of the role

The role turns needs into software that works reliably, is secure, and can be changed as those needs evolve. A developer's work is valuable only when it solves the right problem, so understanding requirements is as much part of the job as writing code.

Design and coding duties

Clarify requirements with product owners, analysts or users.
Design features, data models and interfaces.
Write clean, maintainable code that follows team standards.
Build and integrate APIs and database access.
Review colleagues' code and respond to reviews of your own.
Keep code and documentation in version control.

Testing and maintenance

Developers write automated tests for their code and fix defects found by testers or users. After release, they monitor behaviour, investigate problems reported from production, apply security updates to dependencies and improve performance. Maintenance often takes as much time as building new features.

Collaboration and planning

Most developers work in teams using agile methods. They take part in planning sessions, estimate tasks, share progress in short regular meetings and demonstrate completed work. They work closely with testers, designers, other developers and the people who will use the system.

Tools of the job

Typical tools include a code editor or integrated development environment, Git and a code hosting platform, a task tracker, database tools, API testing tools, and continuous integration pipelines that build and test code automatically.

How performance is judged

Developers are judged on the quality and reliability of what they deliver, on meeting agreed commitments, on the defects their work introduces, on the clarity of their code and documentation, and on how well they collaborate with and support colleagues.

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Common questions

What is the difference between a software developer and a software engineer?

The titles are often used interchangeably. Some organisations reserve engineer for roles with more responsibility for design, architecture and scale.

Do developers work directly with users?

Sometimes. Many work through product owners or analysts, but developers in small teams or public institutions often meet users to understand requirements and gather feedback.

Can software developers work remotely?

Many can, at least part of the time, depending on the employer. Remote work demands clear written communication and disciplined habits, and it opens opportunities with organisations outside Rwanda.

How much of a developer's time goes into writing new code?

Less than people expect. Reading existing code, investigating defects, reviewing colleagues' work, testing and discussing requirements take a large share of most weeks.