What Is Application Migration?

Application migration is the process of moving a working software application, with its code, data, configuration and integrations, from one hosting environment to another, such as a new server, a different cloud provider or a managed platform, while keeping it available to users. A good migration is planned, tested, reversible and finished with a verified cutover.

Codersarts provides application migration services for web applications, APIs, SaaS products and background services. We move apps between servers and clouds, off platforms such as Heroku, Render, Replit and Firebase, and from shared hosting to properly managed infrastructure, with a rehearsed cutover, a rollback plan and monitoring from the first minute.

Application Migration at a Glance

Why Companies Migrate Applications

• Cost. Platform pricing grows with usage; the same app on a right-sized server or cloud account can cost far less each month

• Platform limits. Request timeouts, sleeping free tiers, missing background workers or no persistent disk stop the app from growing

• Reliability. Shared hosting and overloaded servers cause slow pages and outages

• Ownership. The app runs in a developer's personal account and needs to move into a company-owned cloud account

• Compliance and data location. Customers or regulators require data to stay in a specific region

• End of life. The old server or operating system no longer receives security updates

• Consolidation. Several apps spread across different providers are brought together for easier management

Who Application Migration Is For

• Startups leaving a platform whose bill grows faster than their revenue

• Founders whose app still runs in a former developer's personal account

• Businesses on ageing servers or shared hosting that no longer receive security updates

• Teams consolidating several apps spread across different providers into one company cloud account

• Companies that must move data into a specific region for customers or regulators

Types of Application Migration

Cloud providers describe migration strategies as the "Rs". Most small and mid-sized applications use one of the first three.

We recommend the least disruptive route that solves your actual problem. In most projects that means rehosting first and improving afterwards.

Common Migration Routes We Handle

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Our Application Migration Process

1. Assessment. We map the app's components, runtimes, databases, file storage, environment variables, scheduled jobs, third-party integrations, domains and email settings. Hidden dependencies are the main cause of failed migrations, so this step is never skipped.

2. Target design. We choose the server or platform size, region, database setup, backups and monitoring, and agree the cost estimate with you.

3. Build the new environment. Infrastructure is created in your company's account, with secrets stored securely and access granted only to the people who need it.

4. Data migration plan. We choose between a one-time copy during a short window or continuous replication with a final sync, depending on data size and how much downtime you can accept.

5. Rehearsal. We migrate a copy, run the app on the new environment and test logins, payments, emails, uploads, scheduled jobs and integrations.

6. Cutover runbook. A written plan lists each step, who does it, how long it takes, how success is checked and when rollback starts.

7. Cutover. We freeze changes, sync the final data, switch DNS or traffic, and verify every critical function.

8. Hypercare. We watch errors, performance and jobs closely for the first days and fix anything that appears.

9. Decommission. Only after you confirm everything works do we help you shut down the old environment and stop its billing.

How We Keep Downtime Close to Zero

• Lower DNS time-to-live a few days before cutover, so the switch spreads in minutes instead of hours

• Continuous data replication for larger databases, so the final sync takes seconds

• Blue-green switching, where the old and new environments run side by side and traffic moves only when the new one passes checks

• Read-only mode for a short window when data must not change during the final copy

• Off-peak timing agreed with you, based on when your users are least active

Rollback: Every Migration Has a Way Back

A migration plan without a rollback plan is a gamble. Before cutover, we agree clear rollback triggers, such as failed logins, payment errors, data mismatches or error rates above a set level. The old environment stays untouched and ready until the new one has proven itself. If a trigger is hit, traffic returns to the old environment, and we investigate before trying again.

Database Migration

Data is the hardest part of any migration. We plan database moves carefully:

• Same engine moves, such as PostgreSQL to PostgreSQL, using native dump and restore or replication

• Engine changes, such as SQLite or MySQL to PostgreSQL, with schema conversion, data type checks and application query testing

• Row counts and checksums compared between old and new databases before cutover

• File and media storage moved to object storage such as Amazon S3 or Cloudflare R2, with links updated

• Backups taken immediately before cutover, kept until you approve the result

Migration Readiness Checklist

Before any cutover, every item below must be confirmed:

• Full backup of code, database and files, with a successful test restore

• All environment variables and secrets recreated in the new environment

• Scheduled jobs and background workers running on the new environment

• SSL certificates issued and HTTPS working

• Email sending domain records, such as SPF, DKIM and DMARC, checked

• Payment, authentication and webhook URLs updated with each provider

• Monitoring and alerts active on the new environment

• Rollback triggers and owners agreed in writing

Example Migration Timeline

This illustrative timeline is for a typical web application with one database, a background worker and a few third-party integrations.

Simple apps can move in less than a week, while apps with large databases or many integrations may need longer rehearsal.

What We Need From You

1. Access to the code repository, current hosting account and domain settings, granted through team roles.

2. Access to, or a new company-owned account with, the target cloud provider.

3. A list of the third-party services the app uses, such as payments, email and login providers, if you have one.

4. Your preferred cutover window and the people who should approve the result.

5. A person who can test key business flows, such as placing an order or running a report, after cutover.

Application Migration Compared With Doing It Yourself

Application Migration Pricing

Application Migration

Starting at $2,000 per application, one-time

• Dependency assessment and target design

• New environment built in your company's account

• Rehearsal migration and testing

• Written cutover runbook with rollback triggers

• Cutover, verification and hypercare

• Updated documentation for the new environment

The final fixed price depends on the number of services, the database size and whether the database engine changes. You receive a written quote after the assessment.

After Migration

Most clients keep us on to run the app in its new home through Managed Run, starting at $1,000 per month. Cloud and platform charges are paid directly to your provider at their prices.

What Is Not Included

• Rewriting the application for a new architecture, which is quoted as a separate project

• New features delivered during the migration

• Licence or subscription fees for the new platform

• Migration of business email inboxes and office software

Your Accounts Stay Yours

The new environment is created in your company's cloud account, paid by your company. We work through delegated access, and you can remove it at any time. Nothing is hosted in our accounts, so you never depend on us to keep your app online.

Frequently Asked Questions

Plan Your Application Migration

Tell us where your app runs today, where it needs to go and why. We will assess the dependencies and send you a fixed-price migration plan.