Heroku Migration for Elixir Apps

|> Outgrow Heroku without breaking the team that runs on it.

/ / Who this is for

  • |> Teams paying $500+/month in Heroku dynos and add-ons
  • |> Engineering leads whose app is hitting Heroku's connection or slug size limits
  • |> Startups preparing a Series A infrastructure tidy-up
  • |> Small teams who need the migration done right, without owning the whole project themselves

/ / What's included

  • |>Current-state audit: dynos, add-ons, config vars, build pipeline, scheduled tasks
  • |>Target platform selection and architecture design (AWS ECS, EC2, or self-hosted)
  • |>Terraform config written and reviewed
  • |>Zero-downtime cutover plan with rollback procedure
  • |>Database migration and connection pool tuning
  • |>Post-migration monitoring setup and handover documentation

/ / How we work

  1. 1

    Discovery

    We audit your Heroku setup, understand your traffic patterns, and agree a target architecture.

  2. 2

    Build

    We provision the new environment, wire up deployments, and run your app in parallel so there's no big-bang cutover.

  3. 3

    Cutover & handover

    We flip DNS, monitor for 48 hours, and hand over full documentation so your team owns what comes next.

/ / Common questions

Do we need to rewrite any of our application code?
Almost never. Heroku migrations are an infrastructure concern. Your Phoenix app, OTP releases, and Mix config stay the same. We change what surrounds the app, not the app itself.
How long does a Heroku migration typically take?
Most migrations complete in 8-10 weeks. Simple apps with one database can be done in under two weeks. Complexity is driven by the number of add-ons, background job queues, and whether you have strict downtime requirements.
Can you migrate our Postgres database with no downtime?
Yes. We use logical replication to keep the old and new databases in sync during the cutover window, so the switch takes seconds, not hours.
Which platforms do you migrate to?
We can migrate to almost any platform. For teams that need AWS for compliance or existing infrastructure reasons, we use ECS Fargate or EC2 depending on the workload.
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