Top 10 Cloud Migration & Modernization Agencies in California (2026)

As of 2026, the top-ranked cloud migration & modernization agency in California on AgencyCluster is Mission Cloud Services, with an AgencyCluster Score of 91/100. Rankings are based on verified evidence across credibility, proof of work, reputation, category specialization, delivery maturity, and freshness. Rankings are updated periodically as new evidence becomes available.

This list features 9 agencies selected from AgencyCluster's curated directory. Each agency was evaluated using the AgencyCluster Score (0–100), with particular weight on demonstrated expertise in cloud migration & modernization. Only agencies with verified credentials are eligible, and rankings cannot be purchased. The agencies on this list average 17+ years of experience. For full methodology details, see our How We Rank page.

Ask about their migration methodology and how they assess which workloads to rehost, refactor, or rebuild. Check their experience with your source and target platforms. Ask about their approach to minimizing downtime during migration and how they handle data migration for large datasets.

Cloud readiness assessments cost $15K–$50K. Application migration projects range from $50K–$300K per major system. Enterprise-wide cloud transformation programs can exceed $500K. Post-migration optimization runs $10K–$30K/month.