AffirmHiring

Senior Software Engineer (Comms Core)

  • Remote, Poland
  • Senior
  • Posted 10 days ago
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or apply from Claude / ChatGPT / Muse

In one line

Senior backend role on a messaging platform team, building the services that send billions of customer messages; includes on-call.

About the role

Suits an engineer who likes open-ended infrastructure problems and can set technical direction for a quarterly goal while keeping reliability and cost in view.

At a glance

Pay
Not stated in the posting
Remote scope
Remote, Poland
Seniority
Senior
Skills
Python, Kotlin, AWS, MySQL, DynamoDB, Kubernetes
Posted
19 Oct 2026
Last checked
27 Oct 2026

What you will do

  • Own and deliver the team's quarterly technical goals for the communications area.
  • Design and evolve backend services for high-volume messaging: orchestration, delivery, preferences, templates, observability.
  • Build and run integrations with outside messaging vendors, weighing latency, cost, reliability and compliance.
  • Define service-level objectives and metrics, sharpen alerting and incident response, take on-call shifts.
  • Raise the bar on design, testing, code review and rollout, and mentor teammates.

What they look for

  • Five or more years in software engineering with a strong grasp of system design and architecture.
  • Fluency in a modern language such as Python or Kotlin.
  • Experience running highly available distributed systems with AWS, MySQL, DynamoDB and Kubernetes.
  • Track record with multi-region, multi-tenant platforms: isolation, scaling, failure recovery, data consistency.
  • Able to plan delivery of a large feature or system component and write clear code in a big codebase.

How Keywordise applies for you

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  3. 3The form fills itselfName, email, experience and screening questions, field by field.
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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 job fully remote, and from where?

The posting lists it as remote for people in Poland.

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 senior role. The posting asks for: five or more years in software engineering with a strong grasp of system design and architecture; fluency in a modern language such as Python or Kotlin; experience running highly available distributed systems with AWS, MySQL, DynamoDB 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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