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

Open nowPosted 5 days ago

Senior Software Engineer

Workable (global search)108,016 open roles

Where
Barcelona, Catalonia, Spain
Get the CV for this job

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

Your applicationOpen nowSenior Software EngineerWorkable (global search) · Barcelona, Catalonia, Spain

  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 Workable (global search)'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.

7.9% of postings close within 7 days. Measured by our own scanner across the market. Workable (global search) postings stay open a median of 7 days.

Share of postings closed within
  1. 1.6%1 day
  2. 3.6%3 days
  3. 7.9%7 days
  4. 14.9%14 days
  5. 34.0%30 days
This job: posted 5 days ago

Workable (global search) median: 7 days open

The posting

Minka builds real-time payment infrastructure. At the centre is a cloud-hosted ledger that banks, wallets and payment schemes settle through. The Core Platform team builds and runs that ledger. As a Senior Software Engineer on this team you work on the parts of the system that every payment passes through: how a transfer is accepted, validated, recorded and confirmed, how balances stay correct when many transfers touch the same account at once, and how the whole system holds up as volume grows. The work is in TypeScript on Node.js, with PostgreSQL and Kafka, running on Kubernetes.

The first job is to ship. You take work from the team backlog, design it with the team, build it with tests, get it reviewed and into production, and look after it once it is live. When something breaks, you find the cause, fix it and write down what happened.

After that comes performance and scale. You profile the hot paths and remove what slows them down. You design schemas, indexes and queries so that throughput grows with hardware and does not stall on locks or long transactions. You decide what is cached, where, and how it is invalidated, so that a cache never shows a balance that is out of date. You design the event flows between services so that every message is processed exactly once and the system recovers on its own after a broker or a consumer fails.

Later you lead design work that reaches across teams: partitioning strategy, capacity planning, how the ledger behaves during a failover, and what the platform guarantees to the integrations built on top of it. You help other engineers grow through review and pairing.

Success is measured by four numbers:

- sustained transactions per second the ledger handles in load tests, which should rise with each release

- latency at the 99th percentile for a transfer under load, which should fall and stay within the agreed limit

- production incidents caused by your own changes, which should stay at zero

- time to recover after a database or broker failure in a test environment, which should come down to minutes with no manual steps

Requirements

Must have:

- Seven or more years building backend services in production

- Strong TypeScript and Node.js, or a strong backend language and the ability to become productive in TypeScript quickly

- Has built systems where doing something twice by mistake is a serious bug

- Writes tests as part of the work, including load tests

- Has supported their own services in production and led the investigation after an incident

- Explains and defends a design clearly, in writing and in review

Deep experience in at least two of these areas:

- High throughput distributed applications: services that process thousands of requests per second across many instances, with the consistency, ordering and failure handling that comes with it

- Advanced PostgreSQL: query planning, indexing, locking and transaction isolation, partitioning, replication and tuning under heavy write load

- Advanced Kafka: topic and partition design, consumer groups, delivery guarantees, replays, dead letter handling, and running clusters under load

- Caching in distributed applications: choosing what to cache, keeping caches consistent with the source, invalidation, and what happens when a cache is cold or stale

Nice to have:

- Payments, banking or accounting background

- Kubernetes and Docker

- Monitoring, tracing and profiling tools

- Performance engineering as a named part of a previous role

- Spanish

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 Workable (global search)'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 Workable (global search)'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

    Workable (global search)'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.