How to Hire a Backend Engineer: A Step-by-Step Guide for Small Hiring Teams
Hiring a backend engineer is the hire most small companies get wrong first, usually by interviewing for algorithm trivia and then wondering why the new hire cannot run a service. This guide is the process from writing the role to making the offer, for a team that needs someone to build and operate real systems.
- Write the role in terms of the system: Say what the person will own: which services, which data, which users, what is on fire. The role description is the first screening step, and it decides who applies.
- Decide what level you can afford and what level you need. A senior engineer who has run production alone costs more and needs less supervision; a mid-level engineer with a senior around grows fast and costs less.
- Source where backend engineers already are: referrals from your current engineers, with a real bonus and a real follow-up, and open-source contributors to the libraries your stack depends on.
- Screen every CV against a written rubric of the four things the job cannot be done without, then interview for evidence: what the candidate built, decided or fixed, scored against notes written before the interview.
- Decide within a week of the final interview and make the offer with reasons. The common mistakes below, starting with interviewing with algorithm puzzles for a job that is mostly data modelling and operations, are how good candidates are lost.
The process
- 1
Write the role in terms of the system
Say what the person will own: which services, which data, which users, what is on fire. 'Own the payments API and its database, and be on call for both' attracts the right engineer and repels the wrong one. A list of languages does neither.
- 2
Decide what level you can afford and what level you need
A senior engineer who has run production alone costs more and needs less supervision; a mid-level engineer with a senior around grows fast and costs less. Hiring senior into a team with no senior to interview them is the common mistake.
- 3
Source where engineers already are
Your own team's networks first, then communities around your stack, then a job posting written the way the role is written above. Cold outreach works when it names a specific problem the person has visibly worked on.
- 4
Screen against a rubric, not a feeling
Write down the four things the job cannot be done without and score every CV against them before reading any further. Three minutes per CV with a rubric beats fifteen without one, and the decisions can be explained afterwards.
- 5
Interview for evidence
Every interview question should ask for something that happened: a system, a deal, a decision, a failure. Score answers against what a strong one contains, written down before the interview, so two interviewers agree.
- 6
Decide fast and tell everyone
Candidates judge a company by its process. Decide within a week of the final interview, tell the ones you passed on, and make the offer with the reasons you chose them. The best candidates have other offers.
Where to find candidates
- Referrals from your current engineers, with a real bonus and a real follow-up
- Open-source contributors to the libraries your stack depends on
- A job posting that describes the system and the on-call reality honestly
- Engineers at companies one stage ahead of yours who have done what you need next
- Communities and meetups for your language or your domain
Mistakes that lose good candidates
- Interviewing with algorithm puzzles for a job that is mostly data modelling and operations
- Requiring five years in one framework for a role any strong engineer could learn in a month
- Letting the hiring manager be the only interviewer, so nobody checks their blind spots
- Taking three weeks between interview rounds and losing the candidate to a faster company
- Offering below market and hoping the mission covers it
Running it well
The role description is the first screening step, and most are written backwards: a list of technologies and years, then a paragraph about culture. Write the system first. Engineers self-select on problems, and a description of the actual service, its scale and its failure modes brings in people who want that job and screens out people who do not.
Run the process in two conversations and one exercise. A screening call of thirty minutes on what they have owned; a practical exercise on a small, real problem from your codebase, done with their own tools; and a final round of two or three interviews that cover system ownership, incidents, data and working with the team. Everything else is theatre.
Make the offer in writing with the compensation, the level, the on-call expectation and the reason you want them, within a week of the last conversation. Engineers who are good enough to hire have options, and the company that decides fastest with the clearest reasons usually wins.
Frequently asked questions
Should we hire a senior or a mid-level engineer first?
If nobody on the team has run production, hire senior and pay for it; that person will set the standards everyone else learns from. If you already have one senior, a strong mid-level engineer is often the better second hire.
How long should the process take?
Two weeks from first call to offer for a candidate you want. Every week beyond that costs you a share of the candidates who were good enough to have other options.
Is a take-home exercise fair?
If it is short (two hours), real, paid or at least respectful of time, and discussed live afterwards. A multi-day unpaid project filters for people with free weekends, not for good engineers.
Related guides
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