AffirmHiring

Senior Software Engineer, Backend (Comms Core)

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

In one line

Backend role on a communications platform that sends billions of customer messages, building multi-region infrastructure, APIs and vendor integrations, with on-call.

About the role

The team keeps a high-availability messaging system reliable across regions and tenants, covering orchestration, delivery, preferences, templates and observability.

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
29 Oct 2026

What you will do

  • Own quarterly technical goals for the communications area
  • Design and evolve backend services for high-volume messaging across regions and tenants
  • Build and run resilient integrations with external messaging vendors
  • Set service-level objectives, improve alerting and join the on-call rotation
  • Raise standards for design, testing, code review and rollout, and mentor teammates

What they look for

  • 5+ years in software development or engineering with strong system design skills
  • Proficiency in Python, Kotlin or similar languages
  • Experience with highly available distributed systems on AWS, MySQL, DynamoDB and Kubernetes
  • Background in multi-region, multi-tenant platforms with isolation and failure recovery
  • Experience integrating third-party messaging vendors and handling rate limits and failures
  • Able to plan delivery of a significant feature with simple, extensible design

A typical week

  • Designing and reviewing backend services for messaging delivery
  • Working with product, design, analytics and security partners
  • Improving alerting and incident response
  • On-call shifts on rotation

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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Connect Keywordise to your assistant once, then send it the prompt. It applies for you.

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

Disconnect any time in your Keywordise settings.

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
Apply to Keywordise job 57meeqv7tn
How to connect

Questions about this job

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

Yes. The posting lists Senior Software Engineer, Backend (Comms Core) as a remote role for candidates in Poland.

What does this job pay?

No pay range is stated in the posting.

What experience is needed?

It is a senior role. The posting asks for: 5+ years in software development or engineering with strong system design skills; proficiency in Python, Kotlin or similar languages; experience with highly available distributed systems on AWS, MySQL, DynamoDB and Kubernetes. Skills it names include Python, Kotlin, AWS, MySQL.

How do I apply with Keywordise AI?

Select Apply with Keywordise AI, sign up and upload your CV. Keywordise writes a CV and a cover letter for this job from your real experience and applies for you. The 7-day free trial needs no card.

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