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Backend Developer Needed for MVP DevelopmentFreelanceJobsCanada

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Backend Developer Needed for MVP Development

FreelanceJobs
  • CA
    Canada
  • CA
    Canada

About

Openline ) is building a next-gen eSIM shop: users purchase plans, receive activation codes, then generate their eSIM profile on activation via provider APIs.
We're looking for a senior backend engineer to ship our MVP and stay involved for post-launch maintenance. You will work closely with our in-house frontend developer (React / / Tailwind), our sysop, and technical advisors.
Your scope:
- Design and build a fast, reliable MongoDB backend
- Implement core APIs (catalog, checkout webhooks, code issuance, activation, panel, auth)
- Build a clean multi-provider provisioning layer (Maya first, then Orange SBS + 1Global)
- Integrate our Notion-based catalog (plans/prices/provider mapping) via automation (n8n)
- Contribute to production readiness: idempotent payments, logging, monitoring, clear documentation
We value engineers who ship quickly without breaking fundamentals (security, observability, clean architecture). This is not a one-off gig: we want a long-term collaborator through launch + several weeks/months of maintenance (paid), with potential for additional work and longer-term roles if the fit is strong.
If you've shipped production backends with third-party APIs and enjoy owning systems end-to-end, we'd love to hear from you.
Contract duration of 1 to 3 months.
Languages: English, Russian, French. You are expected to have a fluent level of English.
Mandatory skills: API, JavaScript, Web Development, PHP, Python
  • Canada

Languages

  • English
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