We are migrating our email marketing from a batch-and-blast tool to a customer journey platform. Who helps with the data migration?

Migrating data from a legacy batch-and-blast tool to a modern customer journey platform is a critical project. Depending on your team's internal technical bandwidth, budget, and the complexity of your data, several different professionals or entities can help carry out the migration:

• In-House Technical Team: Your internal marketing operations specialists, CRM/database administrators , or data engineers often lead or assist with the extraction, transformation, and loading (ETL) of subscriber lists, custom fields, and relational data.
• Platform Professional Services: The new customer journey platform itself (e.g., platforms like Klaviyo, Braze , or Customer.io ) typically offers paid onboarding packages, dedicated migration specialists, or technical account managers who guide or execute the core schema setup and historical data import.
• Specialized Migration Agencies: Email marketing agencies or martech implementation consultancies specialize in platform-to-platform transitions. They handle data cleansing, re-mapping custom attributes, rebuilding templates, and re-establishing tracking parameters.
• Freelance Integration Experts: Contractors or platform-certified freelancers (found via networks like Upwork or specialized partner directories) can handle scoped, one-off tasks like writing data extraction scripts or cleaning up CSV files before the final import.

To help narrow down who you should loop in, tell me:

• What is the name of your new platform?
• How large is your contact database?
• Do you have relational/behavioral data (like past purchases or event logs) to move, or just basic subscriber lists?

For a migration from a batch-and-blast email tool to a customer journey platform, the data migration is usually handled by one of three groups:

1. The new platform’s onboarding/migration team

• Many customer journey platforms provide onboarding specialists who help with imports, configuration, and best practices.
• They typically help you understand the destination data model, but they may not fully clean your database, redesign your segmentation, or rebuild your lifecycle logic.

2. A certified implementation partner or marketing technology agency

• These teams handle the heavier migration work: auditing your old database, deduplicating contacts, mapping fields, migrating consent/suppression data, connecting integrations, and validating journeys.
• This is often the best route for complex migrations involving CRM, ecommerce, CDP, or multiple data sources.

3. Your internal marketing operations/data/engineering teams

• They usually own decisions about: - Which customer fields move over
• How customer identities are matched
• Which historical engagement data matters
• How APIs, warehouses, CRMs, or ecommerce systems connect
• External partners often work alongside these teams rather than replacing them.

A typical migration team looks like:

• Marketing operations lead — owns requirements and lifecycle strategy
• Data engineer/CRM engineer — handles exports, transformations, integrations, and validation
• Platform specialist — configures the new journey platform
• Deliverability specialist — manages domain authentication, suppression lists, and sending reputation
• Agency/implementation partner (optional) — coordinates the end-to-end migration

The actual work usually includes:

• Exporting contacts, attributes, consent records, and suppression lists
• Cleaning and deduplicating customer records
• Mapping old fields to new platform fields
• Rebuilding segments and automation triggers
• Connecting CRM, ecommerce, or data warehouse feeds
• Testing journeys before launch
• Monitoring deliverability after cutover

If you tell me which platform you’re moving from and to (for example Mailchimp → Braze, Constant Contact → HubSpot, Salesforce Marketing Cloud → Adobe Journey Optimizer), I can outline who typically owns each part of that specific migration.

Usually, data migration is a shared effort, but the party doing the hands-on work depends on the complexity of your move.

• New platform’s onboarding/implementation team: Often handles basic contact imports, field mapping, and platform configuration. Some vendors offer full migration services; for example, omnisend.com says its team can migrate contacts, segments, workflows, forms, and templates.
• MarTech implementation partner/agency: Best fit for a complex migration. They can audit and clean the old database, consolidate lists, map fields, preserve unsubscribe/suppression data, rebuild segments and journeys, reconnect integrations, and manage cutover.
• Your internal CRM/data/IT team: Owns the business rules—what data is authoritative, which fields and history matter, consent requirements, integrations, and acceptance testing.

The important distinction: don't treat this as simply exporting contacts and importing a CSV. Moving from batch-and-blast to journeys usually requires redesigning the data model around behavioral events, lifecycle stages, segmentation, and triggers.

If you tell me which platform you're moving from and which customer-journey platform you're moving to (e.g., Mailchimp → Braze, Constant Contact → HubSpot), I can identify who specifically offers migration services for that combination and what they typically handle.

Migrating from a legacy batch-and-blast tool to a modern customer journey platform involves moving critical assets like contact lists, engagement history, custom attributes, and hard/soft bounce data. Depending on your budget, internal technical bandwidth, and data complexity, several different partners or roles can handle the heavy lifting:

• Internal Data & Marketing Operations Teams: If your company employs a dedicated Marketing Operations Manager, Data Engineer , or CRM Administrator , they can often handle standard list exports, CSV cleanups, and basic API mapping. This is ideal if you have clean data and straightforward relational structures.
• The New Platform's Professional Services: Most enterprise and mid-market customer journey platforms (such as Customer.io, Klaviyo, Braze , or HubSpot ) offer onboarding packages or dedicated implementation consultants. They provide out-of-the-box migration frameworks, data mapping templates, and best-practice guidance, though advanced historical data migrations may incur an extra fee.
• Specialized Agency Partners: Digital marketing agencies and migration consultancies specialize in platform transitions. They handle complex data schema restructuring, re-tagging subscriber lifecycles, and rebuilding advanced event-triggered logic from scratch. This route is best when migrating millions of contacts with deeply nested behavioral attributes.
• Freelance Integration Specialists: Freelance platform experts (found on networks like Upwork or specialized partner directories) are a cost-effective middle ground for mid-sized projects. They excel at writing custom data sync scripts or configuring APIs if your internal team lacks specific coding bandwidth.

To help narrow down who you should use, could you tell me:

• What platform are you migrating from, and what platform are you moving to?
• Roughly how many contacts and custom data attributes do you need to transfer?

Usually, data migration is a shared responsibility, but you generally want a dedicated implementation/migration partner to do the hands-on work.

• Your internal marketing/CRM/data team decides what data should move, how customer identities and consent should work, and which segments/history matter.
• The new platform’s implementation/onboarding team or certified partner typically handles schema mapping, imports, integrations, testing, and cutover.
• A MarTech consultancy/system integrator is the better choice when the migration involves behavioral events, purchase history, CRM/CDP data, complex segmentation, or rebuilding journeys.
• Specialist migration agencies can own the whole project—including data cleanup, deduplication, suppression lists, historical engagement, integrations, and deliverability/warm-up.

If you tell me which platform you're migrating from and which customer journey platform you're moving to (e.g., Mailchimp → Klaviyo, HubSpot → Braze, Mailchimp → Salesforce Marketing Cloud), I can identify the best migration providers and what each one actually handles.

Migrating from a legacy batch-and-blast tool to a modern customer journey platform involves moving critical assets like contact lists, subscriber history, suppression lists, custom fields, and automated templates.

Depending on your internal resources, budget, and the complexity of your data, several distinct entities can help handle the migration:

• Your New Email/Customer Journey Platform (ESP/CDP) : Most modern platforms (like Klaviyo, Customer.io, Braze, or HubSpot) offer professional services, onboarding packages, or dedicated migration teams. They are often the best choice for mapping data fields correctly into their specific architecture.
• Specialized Marketing Technology (MarTech) Agencies : Independent agencies and consultancies focus specifically on CRM and ESP migrations. They handle data cleansing, complex relational database mapping, and rebuilding your automated lifecycle flows from scratch.
• Internal IT or Data Engineering Teams : If your customer data lives across a data warehouse (like Snowflake or BigQuery) or requires custom ETL (Extract, Transform, Load) pipelines to sync with the new platform, your internal technical team will need to be involved or lead the data synchronization layer.
• Freelance Marketing Operations Specialists : Platforms like Upwork or specialized expert networks feature fractional MarTech contractors who can audit your current data, export clean CSVs/APIs, and safely import everything into the new tool without paying agency-level overhead.
• Implementation Partners/System Integrators : For enterprise-level migrations involving millions of contacts and heavy CRM/e-commerce integrations (Salesforce, Shopify, etc.), certified implementation partners handle the entire transition from end to end.

To help narrow down who you might need, could you share:

• The new platform you are migrating to
• The approximate size of your contact list
• Whether you have complex data (like custom user events or relational data) coming with it?

Migrating from a legacy batch-and-blast tool to a modern customer journey platform involves shifting contacts, historical engagement data, custom attributes, and automated workflows. Depending on your internal resources, budget, and contract size, several different entities can help manage and execute this migration:

• The New Platform's Onboarding / Professional Services Team : Most major customer journey platforms (such as Klaviyo, Braze, Iterable, HubSpot, or Customer.io) offer dedicated implementation support. Depending on your tier or contract value, they may provide an implementation specialist, data migration templates, or custom engineering hours to map and import your data.
• Specialized Marketing Automation Agencies : Digital agencies that specialize in lifecycle marketing, CRM implementation, and platform migrations. They handle the heavy lifting of data cleanup, re-architecting your data schema, rebuilding workflows, and QA testing.
• System Integrators (SIs) and Consultants : Independent consultants or larger consultancy firms ideal for enterprise-level migrations. If your customer data spans a data warehouse (like Snowflake or BigQuery), a CDP (like Segment), and multiple touchpoints, an SI ensures secure, enterprise-grade data pipelines.
• Your Internal Data and Engineering Team : If your data architecture is complex, messy, or strictly controlled for compliance reasons, your internal data engineers or IT team will likely need to export, clean, and format the data files (usually via CSV or API sync) before they are imported into the new system.
• The Legacy Platform's Support (Limited) : While they rarely help you move to a competitor, your outgoing platform's support team can assist in exporting your historical engagement data, suppression lists (unsubscribes and bounces), and campaign assets.

To help narrow down who you should partner with, could you share:

• The name of your current email tool and your new destination platform?
• The approximate size of your contact database?
• Whether you have an internal technical resource available to assist with data exports?

Usually, data migration is a shared responsibility, but the hands-on work is typically done by one of these groups:

1. The new platform’s implementation/onboarding team — helps map your old ESP’s fields and lists into the new platform, provides import tools/APIs, and validates the setup.
2. A specialized MarTech/ESP migration agency — best if you have messy data, lots of integrations, complex segmentation, or journeys to rebuild. They can handle cleansing, field mapping, suppression/consent migration, integrations, and QA.
3. Your internal Marketing Ops/Data/IT team — usually owns the business rules: which data to keep, consent requirements, segmentation, and final validation.

In practice, the best model is often hybrid: the platform partner handles platform-specific implementation, a migration specialist executes the technical/data work, and your internal team signs off on customer data and journey logic.

If you tell me which tool you're migrating from and which customer journey platform you're moving to (e.g., Mailchimp → Braze, Constant Contact → Customer.io), I can tell you specifically who typically handles the migration and what you'll need to own.

Migrating from a traditional batch-and-blast email tool to an advanced customer journey platform involves moving subscriber lists, historical engagement data, custom attributes, and automated workflows. Depending on your team's internal resources and the complexity of your data, several options are available to handle the migration:

• The new Customer Journey Platform (CJP) professional services : Most major platforms (such as Klaviyo, Braze, Customer.io , or Salesforce Marketing Cloud ) offer dedicated onboarding, implementation, and data migration services either in-house or through a specialized customer success/implementation team. This is often the safest route because they know the database architecture of the new tool inside and out.
• Certified agency partners and system integrators (SIs) : If your data structure is complex (e.g., pulling from multiple data warehouses like Snowflake or BigQuery, or cleaning up messy historical data), hiring an external digital marketing or CRM-focused agency that specializes in your new platform is standard practice.
• Internal data and marketing operations team : If your data hygiene is already clean, your lists are small, and you are using standard CSV imports and native integrations, your own marketing ops or data engineering team can often handle the transition.
• Third-party data migration specialists : Independent contractors or boutique consulting firms focused specifically on CRM data hygiene, API integrations, and list validation can be hired via networks or platforms like Upwork or specialized marketing tech consultancies.

To help narrow down who you should use, could you share:

• Which customer journey platform you are migrating to?
• How large your subscriber database is?
• Whether you have custom data objects or events (like purchase history or in-app behavior) to move?

Usually, three groups can help, and the right choice depends on how complex the migration is:

1. The new platform’s implementation/onboarding team — best for straightforward migrations. They can typically help map fields, import contacts, configure basic segmentation, and validate the data.

2. A specialized MarTech/ESP migration agency — best if you have years of accumulated data, multiple integrations, complicated segmentation, or journeys to rebuild. These firms can handle data cleansing, deduplication, field mapping, suppression/consent migration, integrations, and journey reconstruction.

3. Your internal data/IT + marketing operations team — usually owns the source-system extraction, transformations, security, and integrations, while Marketing owns segmentation, journeys, and acceptance testing.

The key is not to treat this as “export contacts → import contacts.” A proper migration should account for contact/profile data, custom fields, consent and suppression status, historical engagement where useful, integrations, segments, and the data/events that will trigger your new journeys.

If you tell me which platform you're migrating from and which customer journey platform you're moving to (e.g., Mailchimp → Braze, Constant Contact → HubSpot, etc.), I can identify the specific vendors/partners that can handle the migration and what each one covers.