Data Migration Services
ClickMasters executes data migrations for B2B companies across the USA, Europe, Canada, and Australia. MySQL to PostgreSQL migrations that preserve every row, every relationship, and every business rule. On-premises to AWS RDS migrations with AWS Database Migration Service. Schema migrations that re-architect the data model without downtime. Application data migrations that transform and consolidate data from multiple systems. Every migration proceeds through a validated plan no surprises on cutover day.
Years Experience
Projects Delivered
Client Satisfaction
Support Available
Change Data Capture (CDC) for Zero-Downtime Migration
Change Data Capture reads the database's transaction log (binary log on MySQL, WAL on PostgreSQL) and streams every insert, update, and delete as an event in real time, with the exact data that changed. For zero-downtime migration: the initial data load copies all existing data to the target database. Once the initial load completes, CDC streams every subsequent change from the source to the target keeping the target in near-real-time sync while the source remains live. When the target has caught up (replication lag < 1 second), the application is cut over to the target database typically a few seconds of read-only mode or a brief maintenance window to ensure the final transactions are applied. After cutover, the source is kept in read-only mode for a parallel running period to validate data consistency. AWS DMS implements CDC for supported source databases (MySQL, PostgreSQL, Oracle, SQL Server, MongoDB). Debezium is the open-source alternative for teams managing their own CDC infrastructure.
Migration Rollback Planning
Every migration has a tested rollback path. Pre-migration snapshot: full RDS snapshot taken immediately before migration start restores the original state in 10-20 minutes if the migration fails catastrophically. Dual-write rollback: while in dual-write mode, reverting to the old database requires only changing the feature flag or application configuration no data reconstruction. Post-cutover rollback window: for 24-48 hours after cutover, the old database remains in read-only mode rollback requires switching the connection string back, then replaying any writes that occurred on the new database against the old one (requires CDC capture of post-cutover writes). ClickMasters documents rollback procedures, tests them in staging, and includes them in the cutover runbook. The rule: a migration without a tested rollback plan is not a migration it's a gamble.
Data Migration Services We Deliver
ClickMasters operates as a full-stack data migration partner. Our team handles every layer of the software delivery lifecycle — product strategy, UI/UX design, backend engineering, cloud infrastructure, QA, and ongoing support.
Database Platform Migration
Migrate between database engines: MySQL/MariaDB to PostgreSQL (most common PostgreSQL's superior features, RLS, JSONB, managed RDS), SQL Server to PostgreSQL (.NET shops moving away from Microsoft licensing), MongoDB to PostgreSQL (when document data has grown relational and ACID requirements emerged schema discovery, nested documents, arrays), Oracle to PostgreSQL (enterprise migration proprietary SQL extensions, stored procedures, Oracle-specific data types). AWS Schema Conversion Tool (SCT) automates compatibility assessment and SQL conversion.
Cloud Migration (On-Premises → AWS RDS)
Lift databases from on-premises to AWS RDS: AWS DMS for live migration (CDC-based replication reads source binary log, replicates changes to RDS near-real-time, enables zero-downtime cutover), pg_dump/restore for smaller databases (offline migration, acceptable downtime for <100GB), S3 import for very large databases (dump to S3, DMS loads). Pre-migration: source database config changes (enable binary logging on MySQL, logical replication on PostgreSQL), network connectivity (Direct Connect/VPN), RDS provisioning (benchmark before cutover).
Zero-Downtime Migration Strategy
For databases that serve production traffic: dual-write pattern (application writes to both old and new during migration window new reads served from new once at parity), blue-green database migration (provision new database, migrate all data, switch connection string in one operation instant cutover, easy rollback), expand/contract schema migration (add new schema alongside old, migrate application reads/writes, validate, remove old schema), feature flag migration (gate new schema reads behind feature flag roll out progressively). Deliverable: cutover runbook with step-by-step instructions, validation queries, rollback triggers.
Application Data Migration
Transform and consolidate data between application schemas: data cleansing (standardise formats phone numbers, addresses, dates remove duplicates, fix encoding errors, handle NULL values), data transformation (map old schema to new split 'name' to 'first_name'/'last_name', normalise denormalised legacy schema, merge data from multiple tables into new unified model), multi-system consolidation (merge data from two databases after acquisition resolve entity matching: same customer in both with different IDs and slightly different names).
Data Validation & Reconciliation
Migration completeness and accuracy validation: row count reconciliation (every source table row count matches target automated comparison script), checksum validation (aggregate checksum of key columns in source and target validates no rows silently corrupted), business rule validation (application-level consistency checks do all foreign key relationships hold? Do all NOT NULL constraints pass?), parallel running period (source and target both write-active automated comparison of diverging rows catches data discrepancies before cutover).
Rollback Planning
Every migration has a tested rollback path: pre-migration snapshot (full RDS snapshot before migration start restores original state in 10-20 minutes), dual-write rollback (while in dual-write mode, reverting to old database requires only changing feature flag no data reconstruction), post-cutover rollback window (24-48 hours after cutover, old database remains read-only rollback requires switching connection string back, replaying writes from new to old via CDC capture). Rollback procedures documented, tested in staging, included in cutover runbook.
Why Companies Choose ClickMasters
Change Data Capture from source binary log/WAL target sync near-real-time
Basic: Offline migration (hours/days downtime)
Full production migration rehearsal in staging with production-snapshot data surfaces 80-90% of issues
Basic: First migration on production (high risk)
Application writes to both old and new during migration window instant cutover, easy rollback
Basic: Big-bang cutover (no rollback path)
Every row counted, aggregate checksums compared zero data loss guarantee
Basic: Sample validation only (rows can be missing)
Add new column, dual-write, migrate reads, drop old each phase independently safe, zero downtime
Basic: ALTER TABLE with downtime
Our Data Migration Process
A proven methodology that transforms your vision into reality
Migration Assessment
Source analysis (schema, data volume, compatibility), target platform selection, downtime requirements, risk evaluation, migration plan (strategy, timeline, rollback), dress rehearsal schedule. Deliverable: Migration Assessment + Plan.
Schema Conversion & Setup
AWS SCT (Schema Conversion Tool) compatibility assessment, SQL conversion (automated + manual for incompatible constructs), target database provisioning (RDS instance, parameter tuning, performance baseline). Deliverable: Converted Schema + Target Database.
Data Migration Execution
Initial data load (full dump/restore), CDC replication setup (AWS DMS or Debezium), parallel running period (source + target write-active), validation (row count, checksum). Deliverable: Synchronised Target Database.
Cutover & Validation
Dress rehearsal (full run in staging with production-snapshot data), cutover runbook execution (step-by-step, validation at each step), parallel running period (2 weeks with source read-only), final validation, application switch, rollback preparedness. Deliverable: Migrated Production Database.
Migration Assessment
Source analysis (schema, data volume, compatibility), target platform selection, downtime requirements, risk evaluation, migration plan (strategy, timeline, rollback), dress rehearsal schedule. Deliverable: Migration Assessment + Plan.
Schema Conversion & Setup
AWS SCT (Schema Conversion Tool) compatibility assessment, SQL conversion (automated + manual for incompatible constructs), target database provisioning (RDS instance, parameter tuning, performance baseline). Deliverable: Converted Schema + Target Database.
Cutover & Validation
Dress rehearsal (full run in staging with production-snapshot data), cutover runbook execution (step-by-step, validation at each step), parallel running period (2 weeks with source read-only), final validation, application switch, rollback preparedness. Deliverable: Migrated Production Database.
Data Migration Execution
Initial data load (full dump/restore), CDC replication setup (AWS DMS or Debezium), parallel running period (source + target write-active), validation (row count, checksum). Deliverable: Synchronised Target Database.
Technology Stack
Modern tools we use to build scalable, secure applications.
Back-end Languages
Front-end Technologies
Databases
Cloud & DevOps
Industry-Specific Expertise
Deep expertise across various sectors with tailored solutions
MySQL to PostgreSQL Migration
On-Premises to RDS PostgreSQL
Monolith to Microservices Schema Split
Post-Acquisition Data Consolidation
Data Migration Development Pricing
Transparent pricing tailored to your business needs
Migration Assessment
Perfect for businesses that need migration assessment solutions
Package Includes:
- Timeline: 1 - 2 weeks
- Best For: Source analysis, compatibility assessment, migration plan, risk evaluation
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
MySQL → PostgreSQL (<50GB)
Perfect for businesses that need mysql → postgresql (<50gb) solutions
Package Includes:
- Timeline: 2 - 4 weeks
- Best For: Schema conversion, DMS replication, validation, cutover runbook
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
MySQL → PostgreSQL (50GB-1TB)
Perfect for businesses that need mysql → postgresql (50gb-1tb) solutions
Package Includes:
- Timeline: 3 - 6 weeks
- Best For: As above with performance tuning, extended parallel running, validation
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
On-Premises → AWS RDS
Perfect for businesses that need on-premises → aws rds solutions
Package Includes:
- Timeline: 3 - 6 weeks
- Best For: DMS setup, network connectivity, cutover plan, validation, rollback
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Zero-Downtime Schema Migration
Perfect for businesses that need zero-downtime schema migration solutions
Package Includes:
- Timeline: 2 - 4 weeks
- Best For: Expand/contract plan, dual-write scripts, validation, feature flag rollout
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Application Data Migration
Perfect for businesses that need application data migration solutions
Package Includes:
- Timeline: 2 - 5 weeks
- Best For: Transform, cleanse, consolidate, validate, reconciliation report
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
MongoDB → PostgreSQL
Perfect for businesses that need mongodb → postgresql solutions
Package Includes:
- Timeline: 3 - 6 weeks
- Best For: Schema design, document flattening, migration, validation, application update
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
Migration Retainer
Perfect for businesses that need migration retainer solutions
Package Includes:
- Timeline: Ongoing
- Best For: Post-migration monitoring, performance tuning, data reconciliation
- Dedicated Project Manager
- Quality Assurance Testing
- Documentation & Training
* All prices are estimates and may vary based on specific requirements. Contact us for a detailed quote.
CEO Vision
To build scalable, intelligent custom software development solutions that empower businesses to grow, automate, and transform in a digital-first world.
We are not building software. We are architecting the infrastructure of tomorrow — systems that think, adapt, and grow alongside the businesses they power. Our mission is to make cutting-edge technology accessible to every ambitious team on the planet.
Amjad Khan
CEO
12+
Years
300+
Projects
98%
Retention
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