Cloud Migration & Serverless

Migrating Legacy Apps to Serverless AWS

A proven roadmap for migrating monolithic applications to serverless architectures on AWS, reducing costs by up to 60% and improving scalability

Krescitus Team 6 min read

Legacy applications built on monolithic architectures are costing enterprises millions in infrastructure, maintenance, and lost innovation opportunities. AWS serverless architecture offers a compelling alternative: automatic scaling, pay-per-use pricing, and reduced operational overhead. At Krescitus, we've helped enterprises achieve up to 60% cost reduction and 3x faster time-to-market through strategic serverless migrations.

Why Migrate to Serverless?

Cost Efficiency

  • • Pay-per-use: Only pay for actual compute time
  • • No idle capacity: Zero cost when app is idle
  • • No capacity planning: Eliminate over-provisioning
  • • 60% cost reduction: Average savings across our clients

Scalability

  • • Automatic scaling: Handle 1 to 10 million requests
  • • No server management: Focus on code, not infrastructure
  • • High availability: Built-in redundancy across zones
  • • 3x faster growth: Support explosive user growth

Development Speed

  • • Faster deployments: Deploy individual functions, not entire apps
  • • Reduced ops burden: No patching, monitoring, scaling
  • • Modern tooling: CI/CD, observability, security baked in
  • • 40% faster releases: Get features to users faster

Security

  • • Least privilege: Fine-grained IAM policies
  • • Automatic patching: Security updates handled by AWS
  • • Network isolation: VPC, security groups, WAF
  • • Compliance ready: SOC2, HIPAA, GDPR out of the box

Our Migration Approach

We follow a proven, low-risk migration strategy that minimizes disruption while maximizing value:

1

Assessment & Planning

Comprehensive analysis of legacy application architecture, dependencies, and migration readiness. We identify the optimal migration path based on business requirements and technical constraints.

2

Modular Decomposition

Break down monolithic application into smaller, manageable components. We identify candidate functions for Lambda, services for ECS/EKS, and databases for migration.

3

Incremental Migration

Migrate components incrementally using the strangler pattern. Run legacy and new systems in parallel, gradually shifting traffic and validating performance at each step.

4

Modernization

Modernize migrated components with containerization, API gateways, and event-driven architectures. Implement CI/CD pipelines, observability, and security best practices.

AWS Services We Use

AWS Lambda

Serverless compute for running code without thinking about servers. Perfect for event-driven applications and microservices.

Amazon API Gateway

Build, deploy, and manage APIs at any scale. Automatic scaling, pay-per-request pricing, and built-in security.

Amazon DynamoDB

Serverless NoSQL database with single-digit millisecond performance at any scale. Perfect for modern applications.

Amazon S3

Object storage with infinite scalability, durability, and built-in features like lifecycle management and versioning.

AWS Step Functions

Orchestrate serverless workflows and microservices. Visual workflow for building distributed applications.

AWS Fargate

Run containers without managing servers. Perfect for applications that need more control than Lambda allows.

Migration Checklist

Pre-Migration

  • ✓ Application inventory and dependency mapping
  • ✓ Security and compliance assessment
  • ✓ Cost analysis and ROI projection
  • ✓ Team skill gap analysis and training plan
  • ✓ Migration timeline and rollback strategy

During Migration

  • ✓ Set up CI/CD pipelines for new architecture
  • ✓ Implement comprehensive monitoring and logging
  • ✓ Configure security controls (IAM, VPC, WAF)
  • ✓ Data migration with validation and rollback
  • ✓ Gradual traffic shift and A/B testing

Post-Migration

  • ✓ Performance optimization and cost tuning
  • ✓ Documentation updates and knowledge transfer
  • ✓ Ongoing monitoring and incident response
  • ✓ Regular security audits and compliance checks
  • ✓ Continuous improvement and optimization

Real Results, Real Clients

E-Commerce Client Results

60%
Infrastructure Cost Reduction
99.99%
Availability SLA
50x
Faster Deployment Cycles
40%
Development Team Productivity Increase

Get Started Today

Migrating to serverless AWS is not just about technology—it's about transforming your business for agility, scalability, and cost efficiency. Our team of certified AWS architects and migration specialists can guide you through every step of the process.

Start Your Serverless Migration