Senior DevOps Engineer - Mainloop
26 days ago
Barcelona
Senior DevOps Engineer Build a company's entire delivery platform from the first commit, own it outright, and never carry a pager. Both halves of that sentence are deliberate. This is a senior role and it is not a role we can hire junior into — you are the first, for a while the only, and the platform everyone else builds on is the one you put in place. Mainloop is a new engineering team inside an established international group. We are in Barcelona, we are being built from scratch this year, and we have the backing, the customers and the product portfolio of a company that has been around for decades. You get the interesting part of a new team without the part where you check whether payroll clears. Two more things about where this comes from and where it goes. The group has been running a tech lab in Casablanca for more than eight years — Barcelona is its second, built to sit closer to the teams we build for, and AI-native from the first commit, because it starts from a blank page. And the plan does not stop at internal work: within about a year and a half we intend to externalise — external clients, our products sold on the market, products developed for it. The first eighteen months are deliberately spent building as much as possible for the group while the machine gets set up. You would arrive at the start of that curve, not after it. What we build is the software that automates professional‑services work — across roughly fifteen countries, for businesses drowning in process. We build those products and we run them. That second half is why this role exists, and it is not a formality: a team that owns how its software is built should own how it ships. You are the person who ends that. You are our first DevOps engineer, and for a while our only one. You are not inheriting a platform. You are writing one. There is no infrastructure‑as‑code in our estate today — not a line. The environments that exist were built by hand and are reconstructible only from a runbook and one person's memory. Your first job is to make that permanently untrue: every environment we run reproducible from a committed repo, from your first week, before the habit sets. In your first few months you will: • Build the platform from code. Hosts, networking, ingress, access, environments — committed, parameterised, reviewable. It is the cheapest moment this will ever be done, and you get to do it properly instead of retrofitting it., • Make deployment self‑serve. Today, shipping an existing app is a git push; standing up a new one needs admin rights and two undocumented footguns. That gap is yours to close, down to one command, so a developer never holds a platform credential., • Own secrets properly. A real machine secrets manager, and — because we run a lot of AI agents — credentials brokered so an agent process only ever holds a placeholder, never a key. If you have opinions about how you stop a prompt‑injected agent leaking a production credential, you will enjoy this part; almost nobody gets to design it from scratch., • Prove the restore. We have a written standard that says "someone deploys it" is not "someone has proven the restore works." You will run the drill, write the report, and be the reason the honest answer to "is it backed up?" changes from no to yes, and here is the evidence., • Build the release path. Commit to production, an automated test gate, per‑branch preview URLs a stakeholder can open from their phone, and a rollback that everyone on the team has rehearsed before they need it., • Then keep it all running — and keep making it duller. Observability, cost caps, dependency hygiene, the unglamorous work that decides whether a small team can own a lot of products. And you will have the authority to match. You are not implementing someone else's platform design. You report directly to Edouard, there is no layer in between, and how this is built is yours to decide. We are hiring at senior level precisely so that those decisions can be yours — the platform every product here runs on is the one you put in place, and we would rather bring in the judgement than supervise it. Nobody is on call. Ever. No rota, no pager, no phone number, no "just keep an eye on it this weekend". Alerts post to a team channel and wait there. If something breaks at 3am on a Saturday, or in the second week of August, it gets fixed the next working morning. This is a decision on the record, not an oversight we will rediscover later — and it applies to every product we own, with no exceptions. We are telling you this up front because it is not a perk we are quietly hoping you will waive. Plenty of ads say "healthy on‑call culture" and mean a rota. We mean there is no rota. Here is the honest other half, and it is the actual job: we can only make that promise because we protect ourselves with engineering instead of with people's evenings — and that engineering is what we are hiring you to build. So the trade is explicit: you are never woken up, and in exchange the systems have to be genuinely recoverable. If you have spent a career being paged for things that should have been engineered away, this is the version of the job where you get to do the engineering instead. During working hours it is the opposite of hands‑off. The PO, the developers and the DevOps engineer assigned to a product own that product's incidents — support is not shipped off to a separate team, it is part of owning the thing, and it is what keeps everyone honest about quality. How we build — deliberately boring, and you get a say in it We have a settled stack and it is the same in most repos on purpose: one scaffold, shared packages, push‑to‑deploy. The payoff is that a two‑person team can pick up a product they have never seen and be useful the same day, which is the only reason a team this size can own this many products. We build the simplest platform that meets the requirement, and we are strict about what the requirement actually is. Complexity here has to earn its place: every capability we run is one more thing one team has to understand, patch and be able to rebuild. A concrete example, because it tells you a lot about us: we do not run Kubernetes, and that was a decision rather than an omission. We looked at it properly, twice — most recently because we were worried we had got it wrong — and both times the answer was that a small portfolio on predictable traffic does not need multi‑node scheduling and autoscaling badly enough to pay for them with the only infrastructure engineer we have. We wrote down the specific conditions under which we would change our minds, and when one of them is met, we will. Which is why we are asking for someone who has run Kubernetes in production and can tell us when it is not the answer. If your idea of a good week is tuning a cluster, this is the wrong job and we would rather you knew now. If your idea of a good platform is one a small team can fully understand, rebuild from a repo and hand to a new joiner in an afternoon — and you have enough scar tissue to know where that stops being enough — that judgement is most of what we are hiring. It is a default, not a straitjacket. Some things genuinely need something else, and when they do we adapt deliberately, with the reasoning written down. What we do not do is re‑decide the same five questions on every new repo out of habit. And you get a say in what the standard is. Anyone can propose a change — something new that is genuinely better, something we should upgrade to, something we got wrong. A proposal gets researched properly against the alternatives, it gets an answer, and if the answer is no you get the reasoning. On infrastructure, you are not one voice among many — you are the one who decides, within a budget you help set. You will get seriously good at building with AI agents We are an AI‑native engineering team, genuinely — not a team that added a Copilot licence. Every engineer gets their own Claude Max subscription and a desktop orchestrator that runs several coding agents in parallel, each in its own branch. That is true of you too: a great deal of infrastructure work is now specified rather than typed, and you will get very good at driving that — where it works, where it fails, and how to read a diff and decide whether it is actually right. It also makes your job more interesting than the same title elsewhere, because agentic engineering creates infrastructure problems most teams do not have yet: • Agents install packages into code that sits next to client data. Supply‑chain hygiene stops being a compliance checkbox and becomes a live control you own., • Agents hold credentials — or rather, they must not. Brokering machine identity so the agent never touches the real key is a design problem, and it is yours., • Agents cost money in a way that is invisible until the invoice. Per‑project budgets, hard caps and an alert that fires before the cap, not after it., • Agents can deploy. Which means the guardrails between "an agent proposed this" and "this is in production" are infrastructure, not policy. If you have been running agents seriously and have opinions about where they break, we want to hear them. If you are curious but not yet deep in it, that is fine — teaching this well is something we intend to be known for. The Mainloop Barcelona certificate Something we are building alongside the team, and we think it is genuinely unusual. Over your first two to three years here you work through a defined body of knowledge — our architecture, the agentic build method, how to take a product from an idea to something a business depends on, and how to run it well. When you have covered it and can demonstrably run a project our way, you are awarded the Mainloop Barcelona certificate. It is yours. It goes on your CV, and we intend to make it mean something in this market — a signal that the person holding it knows how to build and run production software with AI agents to a standard. We are investing in making it prestigious, because a team whose alumni are sought after is a team good people want to join. If you would be moving countries to take this job, this is the part to weigh most carefully. You would not only be taking a role; you would be spending two or three years acquiring a way of building and running systems that the market is currently repricing upward — and leaving with something you can show for it, on top of a platform you can point at and say you built. • This is an on‑site role in Barcelona. More than the other seats here, and for a real reason: you are standing up physical-ish infrastructure and access for a team being assembled around you, in its first year, and most of that goes faster in a room., • You are the only DevOps engineer for a while. That is authority, and it is also a bus factor — which is why "nothing exists only in one person's head" is written into the role rather than hoped for. Everything you build gets documented and reproducible as you go, not afterwards., • We are building the team this year, and you will shape how it works. Some of our processes are written, some are not, and the ones written after you arrive will have your fingerprints on them. We do not expect you to absorb the cost of relocating, and we would rather say what we cover than leave you to ask. • We pay to get you here. Flights, your first month's accommodation while you find somewhere of your own, the visa and paperwork costs, and an agent to handle the bureaucracy — the NIE, the TIE appointment, the apostilles — instead of leaving you to meet the Spanish administrative system alone. Spanish lessons if you want them., • A relocation bonus, paid on arrival rather than dripped out. It is repayable only if you leave within the first eighteen months, and that condition is the reason we can pay it up front — moving countries costs money at the start, not in year two., • Nobody is on call. Ever. It has its own section above and we mean it literally. If you are coming from a market where infrastructure work and a pager are assumed to travel together, read that section twice — it is the single largest difference between this job and the same title elsewhere, and it is not a perk we are quietly hoping you will waive., • Healthcare with no premium, no deductible and no network — from day one, and not tied to staying in this job., • Thirty calendar days of holiday — that is 22 working days — plus fourteen public holidays, roughly seven weeks in total. That is the statutory floor in Spain, not a benefit we are being generous with. For someone already in Barcelona it is a constraint and we have said why. For someone moving here it is most of the point: this is a job in Barcelona, not a job you do from Barcelona — a team that sits together, in a city worth being physically present in. two things are usually worth more than the headline salary gap and almost nobody has done the arithmetic: a salary here can sit below the Foreign Earned Income Exclusion, and federal student loans on an income‑driven plan are assessed on the income that exclusion has already removed. We are not your tax advisor and you should get one — but ask in the first conversation and we will walk you through the comparison we ran, including the parts where the number comes out smaller. Read this as a description of the engineer you will be here, not a checklist you have to arrive with. Almost nobody ticks all of it on day one, and we would rather hire someone with the instinct and train the rest — that is a large part of what the certificate is for. • You have built infrastructure from nothing before, and it survived other people using it. A platform you were handed and maintained is fine; a platform you created is what we are asking for. This is the one non‑negotiable, and it is why the role is senior: there is nobody here to check your work, and the platform you put in place is the one everyone else builds on for years., • Infrastructure‑as‑code is how you work, not a tool you have used. You can talk about what you do when reality and the repo disagree, because it always eventually does., • You have owned backups and actually restored from them — under time pressure, ideally when it mattered. Everyone has backups. Far fewer have restored., • You are comfortable running things on your own servers, not only on a managed cloud console. We own our infrastructure deliberately, and that is a different skill from configuring somebody else's., • You have run Kubernetes in production — and you are equally comfortable saying when it is not the right answer. We do not run it today. Whether and when we do is one of the decisions this job owns, and we would rather that call were made by someone who has lived with the thing than by someone reasoning about it from the outside., • You automate yourself out of the loop, and you write things down. The measure of this job is how little of it requires you specifically., • You can say no to complexity. The best engineer for this seat is the one who builds the boring thing that works and resists the interesting thing that does not need to exist., • Security is instinct, not a stage. Secrets, access, least privilege, patching — the boring disciplines, held consistently., • English, fluently. It is our working language — we work across roughly fifteen countries. Spanish is genuinely useful day to day. Catalan is not required., • Barcelona. This is a team that sits together, especially in its first year. We do not care what you studied. We care what you have built and run, and whether you can talk us through the decisions in it. Our process is unusual, so here it is up front. Four rounds, and none of them is a puzzle. • Fifteen minutes with Edouard. A short first conversation — who you are, what you are after, and what this actually is. Enough for both of us to work out whether the next one is worth an hour., • A thirty‑minute conversation. What you have built, how you work, and how you think about it. We will ask you to walk us through something you built and then to justify a specific decision inside it. There is no way to prepare for that and it is not meant to catch you out; it is how we tell understanding from familiarity., • A conversation with our Casablanca team. The group has run a tech lab there for more than eight years. You get people who have run production at real scale asking their own questions — and you get to ask them yours, including the ones you would rather not ask the person hiring you., • A project. We give you a brief and a working environment to build it in, with Claude Code already set up and wired to a key, so you are building the way we actually build rather than talking about it at a whiteboard. It is real work rather than a puzzle, you do it on your own schedule — no week off, no flights, nothing that requires you to already be free — and we go through what you built together afterwards. We are hosting a Hackathon between the 9-16th of October. Anyone is free to join ! You will have the chance to win prizes and move straight to the final round of interviews !! How We Started Leyton remains first and foremost an entrepreneurial adventure, which began with the perseverance of two determined characters: François Gouilliard co-founder and chairman, and Olivier de Beauminy, Co‑founder. #J-18808-Ljbffr
Waiters
Sales & Marketing
Chef & Cook
Retail
Construction & Trades
Quick Service
Accounting & Finance
Animal Care
Art, Media, Design
Bar Staff
Barista
Child Care
Cleaning
Customer Service
Driver & Delivery
Education
Engineering
Entertainment
Events & Promotion
Fashion
Health & Social Care
Host & Hostess
Information Technology
Kitchen Porter
Legal
Management
Manufacturing
Office & Admin
Science
Security
Sports & Wellness
Warehouse
Writing & Editing
