A guide to hiring a Linux developer
Linux sits under much of the software people use every day. It runs web servers, databases, phones, routers and the machines in many offices. When a company says it needs Linux help, the real need can be quite different: a server that needs care, a set of scripts that save hours, or a program that has to talk to hardware. The sections below explain the work, the signs of a strong candidate and the habits that make remote work go well. They are written for founders and team leads who need someone to own the system layer.
What the system layer covers
Between your application and the hardware sits the operating system. It starts programs, shares memory, stores files, controls who may do what and moves data over the network. Most outages that look like app bugs come from here, for instance a disk that filled up, a limit that was reached or a service that started in the wrong order. A Linux developer knows where to look first.
The jobs people hire for
Some teams need servers set up properly for a new product. Others have older machines that work but are fragile, and they want them documented and updated. A third group wants automation, so that tasks such as backups, log clean-up and reports run without anyone typing commands. Others build tools or drivers that run close to the system. Each job needs a different balance of skills.
Where a Linux developer fits among other roles
A DevOps engineer focuses on getting code to production through pipelines, cloud accounts and monitoring. A Docker developer packages apps into containers that run the same on any host. A Linux developer works one layer below both and is the person to call when the machine itself is the problem. In a small team one person may fill all three roles.
When a Linux developer makes sense
- A server is slow, runs out of space or restarts without warning.
- Nobody on your team is sure how an older machine is set up.
- Routine tasks are done by hand and sometimes forgotten.
- You need a service to start by itself and recover after a crash.
- Your product includes software that talks to devices or the system directly.
If a managed hosting plan covers your needs, you may not need a dedicated engineer. A developer who says so before you spend money is a good sign.
Ask how they investigate
Give the candidate a made-up problem, such as a web server that has become slow. Listen to the order in which they look: load, memory, disk, network, logs, recent changes. A strong person narrows the cause one step at a time and says what each result means. A weak answer jumps to a restart or a bigger machine. How they think matters more than which commands they remember.
Reading a Linux developer’s background
Request examples of systems they ran or set up, the problems they solved and the notes they left behind. Good answers describe a cause and a fix, for instance a service that failed because of a file permission and how it was found. Treat with care a background that only lists distribution names. Installing a system is simple, while keeping it healthy over months takes judgement.
Questions to ask in interviews
- How would you find out why a server has run out of disk space?
- How do you make a script safe to run twice?
- How do you set up a program to start on boot and restart after a failure?
- What do you check first when a connection between two machines fails?
- How do you keep a server up to date without surprising your team?
Good answers are specific and include real cases. Be wary of anyone who answers every question with a single tool name.
Try a paid mini project
Give each finalist one small piece of real work. Good examples are a script that backs up a folder and removes old copies, a service file for one of your programs, or a short report on a slow test server. Pay for the time spent. Then compare how the person tests, how readable the work is and how clearly they explain what they found.
Agree who holds the keys
Servers hold your most sensitive data, so access needs a plan. Give each person their own login, use keys and not shared passwords, and remove access when work ends. Keep scripts and settings in a repository your company owns. Ask for a short note on how each machine is set up, so that your team can rebuild it without the original engineer.
Working with your team
Walk your developer through the real life of your systems: when traffic peaks, which jobs run at night and what went wrong before. A brief weekly meeting and one shared list of tasks keep the whole team on the same page. Share past incident notes early, because they show where the weak spots are.
Common mistakes
- Making changes on a live server with no backup.
- Sharing one admin login between several people.
- Fixing a symptom with a restart and never finding the cause.
- Keeping server settings only in one person’s head.
Looking at a wider role? Take a look at our DevOps engineers for delivery and cloud work, or our software engineers for general product development.