A guide to hiring C++ developers
C++ is a long-lived programming language used where speed and control matter. It sits behind many desktop programs, databases, trading tools, browsers, engines and other software that people use every day without noticing. It also asks more of the developer than most languages, because memory and threads are managed by hand. This guide explains what C++ developers do, how the role differs from nearby roles and how to set up the work so it goes smoothly. It suits a founder with a performance-critical product as well as a company that must keep an older C++ system alive.
What C++ developers work on
Most C++ work falls into four groups. New builds create components, tools and services from scratch. Speed work finds slow code and makes it faster without changing what it does. Upkeep covers bug fixes, tests and upgrades to a newer language version. Integration connects C++ code to other languages, databases and network services. A small team may need one person for all four, while a larger one splits them.
How this role differs from nearby roles
A C++ developer works on general software in depth. Our firmware engineer page covers code for small devices, with real-time rules and hardware. Our Unreal Engine developer and game developer pages cover games and engines. Our back-end developer page covers web services in several languages, including Go and Rust. If you need a wider team to build and run a product, our software developer page may help. Choose this page when C++ is the language you already use or have decided to use.
Where C++ is a good fit
- Desktop programs and tools that must start fast and stay responsive.
- Data, finance and trading software where small delays matter.
- Libraries and engines that other programs and languages call.
- Network and systems software that works close to the operating system.
- Older products with a large C++ code base that must keep running.
Say early which of these is closest to your project. It changes the tools, the testing and the skills you should look for.
What to decide before you hire
- Which compiler and language version your code uses, and whether an upgrade is planned.
- Which operating systems the software must run on.
- Whether the work is new code, speed work, upkeep or a mix.
- Which libraries and frameworks you rely on, such as Qt or Boost.
- How the project is built and tested today, and who looks after that.
Reading a C++ developer’s profile
Public code helps. Ask for a sample, read how the person handles memory and errors, and see whether they wrote tests. Look at how clearly the project is laid out and whether the commit notes explain each change. Be careful with profiles that list many projects but cannot say which part was theirs. Ask about a bug that took days to find. Someone who can walk through the cause and the fix shows real depth.
Interview questions to try
- Who owns the object in this snippet, and when is it released?
- What is the difference between a copy and a move, and when does each happen?
- A program is slow. Walk us through how you find the cause before you change anything.
- How would you find a data race that appears only once in a while?
- How would you add tests to a large old module that has none?
Pay attention to how the person reasons, not only the final answer. Doubt anyone who says C++ code cannot leak memory.
Run a small paid task
Give each finalist a short brief that fits your software. Fair choices include fixing a known bug in a small library, speeding up one function with a benchmark, or reviewing a short piece of code with planted mistakes. Pay for the time. Compare how readable the code is, how the person proves the change works and how they handle questions about your platforms.
Match experience to the stage
For a prototype you need someone who can build something that works quickly and keep the design plain. Before release you need a developer who is strong at testing, memory safety and build tools. For a long-lived product you need steady care for upgrades, speed and the knowledge held in old code. Titles differ between companies, so ask what each person owned instead of relying on the title.
Give them tools and a rhythm
Give your developer access to the repository, the build system and test machines, and no more than the job needs. Source code and signing keys should stay with your company. In the first month, meet at least once a week and review each change together. After that, a short note each week and a code review before every merge will do.
Working with the rest of your team
C++ code often sits next to work in other languages. A developer who can talk to the Python, web or mobile team about how their code calls yours saves many problems. Agree on one place for design notes, one style guide and one list of supported platforms. When something breaks in the field, make it easy to share crash reports with the developer.
Mistakes to avoid
- Skipping tests because the code is old and hard to change.
- Turning on every compiler optimization without measuring the effect.
- Ignoring compiler warnings until there are thousands of them.
- Copying code you do not understand from a forum or a repository.
- Letting a contractor own your repository, signing keys or build servers.
Need a wider team or help with small devices as well? Read about how to hire a firmware engineer or a back-end developer, and see how hiring works on our pages.