Skip to content
CV Rocket
Get started
How it worksThe enginePricingBlogContactSign in

Open nowPosted 7 days ago

Lead Engineer

Buttermilk5 open roles

Where
London, United Kingdom
Work mode
Hybrid
Get the CV for this job

From $25 per CV, paid once. No subscription.

Your applicationOpen nowLead EngineerButtermilk · London, United Kingdom

  1. YouYes, apply to this one.

  2. CV RocketCV written for this posting.

  3. 25 readersRecruiter, hiring manager, skeptic. Round after round.

  4. CV RocketApplied on Buttermilk's own form.

The reply lands in your private mailbox

3×more interviews than doing it yourself with ChatGPT.

The clock on this job

Early applications get read.

12.3% of postings close within 7 days. Measured by our own scanner across the market. Buttermilk postings stay open a median of 11 days.

Share of postings closed within
  1. 2.1%1 day
  2. 4.5%3 days
  3. 12.3%7 days
  4. 19.7%14 days
  5. 35.6%30 days
  6. 58.0%60 days
This job: posted 7 days ago

Buttermilk median: 11 days open

The posting

Lead Engineer

London

Permanent

Hybrid Working - 3 days in the office, 2 days remote

We run the campaigns ourselves, so we know exactly what the software has to do.

Buttermilk is a London creator-marketing agency. Pantry is the platform our team, our creators and our clients use to run campaigns end to end. It is live with our internal team today. The demand is already here: every campaign we run is waiting on this platform.

Why this is different

Search and reporting are table stakes. The hard part is the operational core: shortlists clients actually approve, outreach that lands, creators paid on time, and AI that understands the Creator.

Most creator platforms are built by people who have never run a campaign. Ours is built next to the team that runs them every day.

What you'd own

The platform that takes Pantry from alpha to what the whole agency runs on. If you want to point at a platform in production and say you built it, this is that seat.

You code every day, set the architecture and work as the product partner to Matt, our Product Lead.

  • Build. Ship vertical slices that real users can try, quickly but built to last. Direct AI coding agents and review their output critically.
  • Decide. Own the architecture and scaling calls, and keep one source of truth for how the system fits together.
  • Run it. Own observability and alerting, and step in when production misbehaves.
  • Partner on product. Break epics into stories, flag dependencies early, challenge the roadmap and demo to the business.
  • Plan honestly. Say what one engineer can deliver by a given date, and say early when that is not enough.
  • Grow the team. Decide when we need more engineers, then hire and lead them.

Along the way: the production basics, creator and campaign intelligence with our data science lead, and integrations for CRM, payments, outreach and invoicing, on a path to SOC 2.

The team you'd join

  • Product Lead
  • Full Stack Engineer
  • Data Science Lead
  • The campaign team: our daily users, at the next desk.

How we work

Decisions are written down and shipped, not held in meetings. We build agent-first and test-driven, in small pull requests, with everything in code, infrastructure included.

What we're looking for

We are hiring at lead level, to build and to stay. There is no senior engineer above you.

  • You have built and scaled a production product to 10,000+ users, and made its architecture calls
  • You ship in vertical slices, fast but without building things that fall over a month later
  • You use AI coding tools every day, can refactor a largely agent-written codebase, and read what the agents produce
  • You have shipped LLM features to production, not just prototypes: structured output, validation, batch versus live calls, cost per item and evaluation
  • You have built for external users: authentication, data isolation between clients, payments and GDPR
  • You build rapport quickly with non-engineers and explain trade-offs plainly
  • You like being in the office with the people who use what you build

Strong plus: multimodal AI (video, image, audio); Python and FastAPI; Google Cloud, Terraform and CI/CD; ingestion from third-party APIs; email deliverability; SOC 2; creator-economy or agency experience.

Transferable experience counts. If your architecture and scaling experience carries over, the exact stack matters less.

You probably won't enjoy this if

  • You want detailed specs before you start
  • You would rather design systems than build and run them
  • You want a specialist for every layer
  • You trust AI-written code without reading it

Stack

Python services (FastAPI, SQLModel) and a Next.js/TypeScript app on Google Cloud: Cloud Run, Cloud SQL Postgres, BigQuery and Pub/Sub, all in Terraform and deployed from GitHub Actions. It's early enough that you will shape it.

What We Offer

  • Pension, matching contributions
  • Private Medical Insurance
  • Juno Wellbeing Credits
  • Hybrid Working (London)
  • £150 Home Office Setup Budget
  • Night Key Membership
  • Birthday Leave
  • Learning & Development Budget
From $25, paid onceGet the CV for this job

What happens when you press

One press. We do the rest.

  1. A CV for this posting

    Written against Buttermilk's own wording, from every piece of relevant proof in your profile.

  2. 25 readers review it

    Recruiter, hiring manager, skeptic and more read every draft, round after round. You get the best round.

    The review screen in CV Rocket: how each CV was read, round by round.

  3. We apply on Buttermilk's form

    Our application engine gets through the hardest forms there are. Where a question needs you, AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

    An application in CV Rocket: every answer filled in on the employer's form.

  4. Every reply, sorted

    Buttermilk's answer lands in your private mailbox, and we classify it on arrival: interview, question, rejection.

    The CV Rocket inbox: each employer reply classified as an interview, an action or a rejection.

  5. Reply with AI

    AI helps you write the email, checks it and sends it. We show you whether the recruiter read it.

  6. The interview in your calendar

    Full integration with your calendar. The invitation goes straight in.

    An interview invitation in the CV Rocket inbox, added to the candidate's calendar.
Get the CV for this job

From $25 per CV, paid once. No subscription.

Why it works

3×

more interviews than doing it yourself with ChatGPT.

ChatGPT writes a CV and never learns what happened to it. We see every reply. For each CV we know:

  • How it was written, and how the review scored it
  • When we applied, and how long after the posting went up
  • Which posting, which company, which city
  • Who got the interview, and who heard nothing

That is how we know which CVs get called.

Get the CV for this job

From $25 per CV, paid once. No subscription.

The numbers game

More applications. More interviews.

Every application goes out with its own CV, written for that posting and paid once. Send enough of them and the law of large numbers finds you the job.

Get the CV for this job
By hand5–10
With CV Rocket100
applications a day

Nearby

Live postings like this one

Same employer first, then the same role elsewhere.

Before you press

Straight answers

Get the CV for this job

From $25 per CV, paid once. No subscription.

What if my background isn't good enough?

We make the most of the background you have. The CV uses every piece of relevant proof your profile holds, and one of the 25 readers reads your whole profile and flags what the CV left out.

Do you really apply for me?

Yes, on the employer's own form, the hardest ones included. Where a question needs you, you answer it right there and AI suggests the best answer. Don't want us applying from our IP addresses? Use our Chrome extension: we apply straight from your own browser.

Is it a subscription?

No. You pay once per CV, from $25. Every application goes out with its own CV, written for that posting.

One job. One CV.
Paid once.

Pick the posting you want. We write for it, apply for you and catch the reply.

Get the CV for this job

From $25 per CV, paid once. No subscription.