Mozilla Onboarding

On April 16th, I threw an application toward this job posting on I doubted whether I’d be qualified, but I reminded myself that most people apply to jobs where they meet only 80% of the critiera. I could, with some creative redefinition (“of course an internship at Intel is a year of relevant experience!”), meet every listed criterion. So I applied, since the worst they could say was no.

Here’s a rundown my experience getting interviewed and onboarded, which might be of interest to current Mozilla employees curious about how things have changed since they joined, and to anyone interested in working there.


The recruiter replied to my application only 3 hours after I submitted it. This was certainly an improvement since the 6 months of ultimately fruitless bureaucratic limbo when I applied for a Mozilla internship a few years ago!

I found out later that the 3-hour turnaround time included a member of the Servo team reading my resume and verifying that my background looked relevant to their interests, which makes it all the more impressive.

Phone Screens

On April 20th, I had a quick phone chat with my recruiter. It was totally non-tecnical, and I summarized it to my friends afterward as “Did you read your own resume? Did you read the job description? Ok, cool!”. I’m sure they were screening for other stuff as well, perhaps basic social skills and an acceptable level of fluency in spoken English, but that screen was not nearly as scary as I’d been prepared for.

My first techncial phone screen was on 4/22. A second recruiter organized the details of the call, and I talked with Brian Anderson about my background and the Rust programming language’s DevOps needs. He was particularly interested in my work with Chef and Jenkins in production at my Urban Airship job. After this phone screen, the title on the job posting got changed from “Operations Engineer” to “DevOps Engineer”.

On 4/24, I talked with Lars Bergstrom about the Servo project’s needs. Learning about the place that project was at compared to Rust started giving me some perspective into the similarities between the DevOps Engineer role and my work juggling systems administration for a variety of open source projects at the OSU Open Source Lab.

My final phone screen was with Jack Moffitt, on 4/29. This conversation was less a review of my experiences and more a brainstorming session about techniques for speeding up the run time of Rust’s continuous integration tests. Although I wasn’t familiar with the specific scenario yet, I was able to apply my knowledge of CI and Git techniques to propose some possible solutions that the team hadn’t considered yet.

The On-Site Interviews

I interviewd on-site at Mozilla’s San Francisco office on May 4th. My day was scheduled from 10am to 3pm, and I spoke with 5 different Mozilians from various teams. Ordinarily these interviews would have been scheduled at least a week later, but a friend and I had been planning a road trip down to the bay area anyway, so we shifted the dates a bit to fit with the interviews.

Again, I asked the recruiters whether they had any advice on what to expect from the whiteboarding component of the interviews, and again they gave no answer.

Two interviews were with managers higher up in Mozilla Research’s organizational hierarchy. One was very concerned about community and avoiding the problems of “not invented here”, and felt unfamiliar with most “DevOps” related terminology. In that interview, I drew pictures on the whiteboard to explain the similarities between public and private clouds, and we talked a lot about open source community. The other manager wasn’t hesitant to air her concerns about my relative lack of corporate experience, which gave me a chance to explain the applicability of my open source leadership background and OSU Open Source Lab experience to the DevOps Engineer role.

My technical interview with a Rust team member during my onsite interviews was more of a friendly chat about the infrastructure and how to improve its performance. After the first couple of interviews, I went to lunch with a variety of research and devops team members. We chatted about the infrastructure, and I enjoyed the chance to get to know my prospective coworkers in a less formal setting. I find it important to interact with people in a setting where it’s socially appropriate for them to complain about their jobs – the nature of those complaints (or lack thereof) is one of the most useful cues about a project’s real culture rather than the polite facade it necessarily puts on for newcomers.

After lunch, I had the only interview that I’d consider particularly technical. My interviewer framed a question about designing an algorithm to copy a linked list in memory and asked me to describe a solution (psuedocode optional), rather than worrying about the details of writing in any specific language. The question had a trick to it and I would have solved it much faster if I’d seen it before, but my interviewer fed me hints and helped me stay on the right track. This collaborative approach made the interview feel like I was solving a real problem with a co-worker, rather than the “we want to see what you’re like when we terrify you to the breaking point” of some other companies’ interview styles. The tone of that interview cemented my impression that Mozilla had the collaborative, non-malicious culture that I was looking for.

My final interview was with a TaskCluster developer. Since we’d already spoken at lunch (and apparently I’d made a sufficient impression of my technical skills), he told me “Instead of an interview, I’m going to sell you TaskCluster”. We then went through a slide deck on how TaskCluster is designed and its intent to replace BuildBot, and I got a lot of my introductory questions about the tool out of the way.

The Offer

On May 6th, I had a quick phone chat with my original recruiter to discuss compensation. I had already talked with a manager for my prospective role about Mozilla’s bonus and benefits package, which allowed me to do the math on what kind of base salary would result in a total compensation package comparable to the other offers I had on the table. I discussed these numbers and my reasoning behind them with my recruiter. When doing the math on base salary, I also privately calculated the ranges of offer for which I would want to try to negotiate higher, and what ranges I’d be happy to simply accept without haggling.

On May 8th, we had another call during which my recruiter disclosed my specific offer. The number is comfortably competitive for my skills and role – although it doesn’t precisely match my other offers in salary, the difference is less than the benefit to my career of working at a company that understands and values open source.

I received my offer letter on May 12th, verified that the confidentiality agreement was sane (it protects the user data that Mozilla gathers with peoples’ permission, rather than trying to restrict employees’ open source contributions), and signed and returned the paperwork.

Later that day, the Mozilla onboarding system started sending me emails. It walked me through setting up accounts, ordering my work laptop, filing tax paperwork, and all the other bureaucratic minutae associated with starting a new job. The system handed out onboarding tasks in small groups on a set schedule, all with friendly and enthusiastic messages explaining what was going on with that set of forms. This made the whole process much easier than other places I’ve onboarded, where one spends several hours shut in a room with an HR person doing paperwork on the first day.

Time Passes...

Between my offer and start date, I found a new place and moved into it, as well as completing the onboarding tasks as they trickled out of the automated onboarding system. I picked up my laptop from Mozilla IT on May 22, then took it home and installed Arch Linux. I tried Windows just to give it a chance, but it rapidly failed my informal tests of usability.

When I came into the office to pick up my laptop, our wonderful front desk ninja of all trades Katt took my photo and issued me a badge. This was somewhat surprising, as nobody had warned me that I’d be getting photographed that day, but it was ultimately convenient since it provided me with a badge to enter the office on my first day.

I also sent my SSH and GPG public keys to a coworker who started setting up my access to the systems I now administer.

First Day

My first day was actually a Tuesday, 5/26, since that Monday was memorial day. I attended a mandatory IT orientation in which they explained fancy new technologies such as IRC and gmail filters, from 8:30 to 11am. It could have been a lot shorter if they’d packaged it as wiki pages or individual videos to allow us to skip or skim the topics we already knew, but I guess they find it important to put a personal touch on the orientation by having a real live human present it. I’m sure that if I was more extraverted or less symbiotic with my computer, I would have appreciated it a lot more.

The things that people say about a “firehose of information” are all true. There’s a comprehensive but somewhat obsolete wiki, a less thorough but closer to up to date jira, and a bunch of public documentation as well. I’ve been careful to sign up for only those mailing lists which coworkers tell me are directly relevant to my job right now, or else the deluge of facts would be even worse.

First Month Retrospective

I’ve learned that there are benefits and drawbacks to working at a company that I associate with the most friendly and knowledgeable people I’ve ever met. The benefits are that my coworkers are amazing and inspire me to be the best professional and open source community member that I can. The “drawback”, if one can call it that, is that everyone suddenly assumes I’m just as friendly and knowledgeable as everyone else. The title of “Mozilla Employee” seems at times to be a glowing crown emblazoned with “Ask Me Firefox Questions”, but I’ve so far been able to redirect everyone onto my more knowledgeable peers to get their problems solved. And on the whole, there’s no better way of becoming that archetype of friendliness and knowledge than to suddenly have the entire world expecting me to embody it.

I’ve always struggled, as I’m sure you might as well, with accurately assessing my own techncial comptence. At Mozilla, I never feel like the smartest person in the room, and yet I bring specialized knowledge to my team that it would lack without me. This balance keeps me constantly learning, while reassuring me that my contributions are valuable, which is close to optimal for my overall happiness.

The Rust and Servo teams and communities have been incredibly welcoming to me, and they communicate in ways that I find easy to work with.