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Software Engineer II, Backend (Card Integrations and Payments Experience)

  • Remote, Spain
  • Mid-level
  • Posted 13 days ago
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In one line

Backend role on a card checkout team building the in-app payment experience, with on-call rotation; based in Spain with visa sponsorship available.

About the role

Card checkout work covers the systems behind paying with the company's card products inside the app. The team mixes backend and mobile engineers and works closely with product, design and analytics.

At a glance

Pay
Not stated in the posting
Remote scope
Remote, Spain
Seniority
Mid-level
Skills
Python, Kotlin, AWS, MySQL, Kubernetes, Distributed systems
Visa
Sponsorship offered
Posted
16 Oct 2026
Last checked
28 Oct 2026

What you will do

  • Split larger projects into tasks with the tech lead and manager, then deliver them in stages
  • Join product, design and analytics in shaping decisions, naming technical limits and risks
  • Track metrics, raise issues and share the on-call rotation to keep services running
  • Take part in growth activities such as interviewing candidates

What they look for

  • At least two years as a software engineer
  • Experience designing, building and shipping backend systems, with Python or Kotlin
  • Familiarity with distributed systems and tools such as AWS, MySQL and Kubernetes
  • Clear, well tested code and comfort reading and debugging a large codebase

Benefits

  • Monthly stipends for health, wellness and tech spending

How Keywordise applies for you

  1. 1Upload your CVAdd your CV once. It takes about a minute.
  2. 2Tailored to this jobKeywordise writes a CV and a cover letter for this job from your real experience.
  3. 3The form fills itselfName, email, experience and screening questions, field by field.
  4. 4Application sentYou get a receipt and follow it in your dashboard.

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ClaudeConnectorChatGPTConnectorMuseby Meta

Claude

  1. In Claude, open Settings, then Connectors, and choose Add custom connector.
  2. Name it Keywordise and paste the connector URL.
  3. Click Connect, log in to Keywordise and approve. Then send the prompt in a new chat.
Connector URL
https://keywordise.com/mcp

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ChatGPT

  1. In ChatGPT, open Settings, then Connectors. On plans that need it, turn on developer mode first.
  2. Add a new connector with the connector URL and choose OAuth. Leave the client ID and secret empty.
  3. Log in to Keywordise and approve. Then send the prompt in a new chat.
Connector URL
https://keywordise.com/mcp

Disconnect any time in your Keywordise settings.

Muse

  1. Open Muse (muse.ai or the app) and send it the message below.
  2. If Muse asks how to sign in, answer OAuth. Open the sign-in link it sends, log in to Keywordise and approve.
  3. Send the prompt. Muse asks before it sends anything.
Message for Muse
Add a custom connector called Keywordise. It is a remote MCP server at https://keywordise.com/mcp and uses OAuth. Give me the sign-in link.

Muse is available in the US only for now.

Prompt
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How to connect

Questions about this job

Is this a remote job, and where can I work from?

Yes. The posting lists Software Engineer II, Backend (Card Integrations and Payments Experience) as a remote role for candidates in Spain.

What does this job pay?

The posting does not state a salary, so there is no figure to quote.

What experience is needed?

It is a mid-level role. The posting asks for: at least two years as a software engineer; experience designing, building and shipping backend systems, with Python or Kotlin; familiarity with distributed systems and tools such as AWS, MySQL and Kubernetes. Skills it names include Python, Kotlin, AWS, MySQL.

How do I apply with Keywordise AI?

Click Apply with Keywordise AI, create an account and upload your CV. Your CV and cover letter are written for this job from what you have really done, then Keywordise applies for you. Trial: 7 days, no card.

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