Cloud & DevOps
AWS services: architecture, deployment and optimisation of your infrastructure
Amazon Web Services is the public cloud provider with the broadest catalogue: compute (EC2, ECS, EKS, Lambda), managed databases (RDS, Aurora, DynamoDB), storage (S3, EBS, EFS), content delivery (CloudFront), networking (VPC, Route 53) and identity management (IAM). That breadth is also its difficulty: poorly assembled, these services are expensive and expose vulnerabilities.
This service is for SaaS publishers, online retailers and businesses that host, or want to host, their applications on AWS and need a solid, secure architecture with controlled costs, without hiring a full cloud team.
We design the architecture that fits your application, deploy it with infrastructure as code, secure accounts and access on the principle of least privilege, and set up monitoring and cost tracking. We can also audit and optimise an existing AWS infrastructure.
When do we step in?
First production deployment on AWS
Your application is ready and needs reliable hosting. You must choose between EC2, containers on ECS or EKS, or Lambda functions, and get networking, accounts and access right from the start.
AWS bill spiralling
Costs are rising with no link to activity: oversized or forgotten instances, unattached volumes, data transfer, logs kept forever. A cost audit identifies what to fix.
Infrastructure built by hand in the console
Nobody knows exactly what is running, test environments differ from production and every change is risky. Bringing the existing setup under Terraform restores control.
Access security and compliance
Shared access keys, IAM users with administrator rights, misconfigured S3 buckets: configuration mistakes are the leading cause of incidents on AWS.
Scaling and high availability
Your application must absorb traffic peaks or guarantee high availability: multi-AZ distribution, autoscaling, replicated database, CloudFront in front.
How we work
- 1
Scoping and audit of the existing setup
We analyse your application, its dependencies, load peaks, security constraints and budget. If an AWS infrastructure already exists, we inventory it and note gaps against the Well-Architected Framework.
- 2
Architecture design
Choosing services (EC2, ECS Fargate, EKS, Lambda, RDS, S3, CloudFront), organising accounts with AWS Organizations, network layout with VPCs and subnets, backup and recovery strategy. The design is validated with you before anything is built.
- 3
Deployment with infrastructure as code
The infrastructure is written in Terraform or CloudFormation, with locked remote state, reusable modules and separate environments. Nothing is created manually in the console.
- 4
Hardening
Least-privilege IAM policies, roles instead of access keys, encryption at rest with KMS, restrictive security groups, logging with CloudTrail, GuardDuty alerts and public access blocked on S3.
- 5
Monitoring and costs
CloudWatch dashboards and alarms, centralised logs, budgets and cost alerts, resource tagging to attribute spending by project or environment.
- 6
Continuous optimisation
After observation, we right-size instances, adopt the relevant Savings Plans or reserved instances, configure S3 lifecycle policies and remove unused resources.
Technologies we use
- EC2 and Auto Scaling
- ECS Fargate and EKS
- Lambda and API Gateway
- RDS and Aurora (PostgreSQL, MySQL)
- S3 and CloudFront
- VPC and Route 53
- IAM and AWS Organizations
- CloudWatch and CloudTrail
- KMS and Secrets Manager
- Terraform and CloudFormation
- SQS and SNS
- ElastiCache
Why choose Agencei?
Fit-for-purpose, not over-engineered
An SME application does not need a multi-region EKS cluster. We choose the level of complexity your team can actually operate and evolve.
Security built in from design
Least privilege, encryption and logging are not options bolted on afterwards: they are part of every Terraform module we deliver.
Visible, controlled costs
We set up tagging, budgets and alerts from day one, and we explain every line of the bill to you.
Application expertise on top of cloud
We also build Node.js, Java and Python applications: we know what an AWS architecture implies for code, database migrations and deployments.
In brief
- What is this service?
- AWS consulting covering architecture design, infrastructure-as-code deployment, IAM hardening, monitoring and cost optimisation across EC2, ECS, EKS, Lambda, RDS, S3 and CloudFront.
- Who is it for?
- SaaS publishers, online retailers and businesses hosting their applications on AWS without a full in-house cloud team.
- What problem does it solve?
- Getting a reliable, secure AWS infrastructure with controlled costs, instead of a manual assembly that is expensive and hard to evolve.
- How long does it usually take?
- An audit usually takes a few days to a few weeks. Designing and deploying new infrastructure often spans several weeks depending on complexity.
- What factors influence the price?
- The number of services and environments, high availability requirements, the state of existing infrastructure, the required security level and the support desired after go-live.
- How does the engagement run?
- Scoping and audit, architecture design validated together, Terraform or CloudFormation deployment, IAM hardening and encryption, monitoring and cost tracking, then continuous optimisation.
- What are the risks?
- Overly broad IAM permissions, exposed S3 buckets, unmonitored costs, reliance on hand-built resources, and untested backups.
- What alternatives exist?
- A simpler managed platform (PaaS hosting), another cloud provider, or dedicated servers when the workload is stable and predictable.
Frequently asked questions
EC2, ECS, EKS or Lambda: how do I choose?
EC2 suits traditional applications that need a full machine. ECS Fargate is the simplest choice for containers without managing servers. EKS makes sense when you already have Kubernetes skills or advanced orchestration needs. Lambda fits event-driven processing and APIs with irregular traffic.
Can you reduce our AWS bill?
In most unoptimised infrastructures, yes, often significantly. The usual levers are right-sizing, shutting down non-production environments overnight, Savings Plans, S3 lifecycle policies and removing orphaned resources. We start with a quantified audit.
What is the principle of least privilege in IAM?
Each user, role or service receives only the permissions strictly required for its task, on the specific resources involved. This limits the impact of a compromised key or a mistake, and it is one of the core recommendations of the Well-Architected Framework.
Do I need one AWS account per environment?
That is the best practice recommended by AWS: one account for production, one for development, one for shared tooling, grouped under AWS Organizations. It isolates incidents, simplifies per-environment billing and makes permissions easier to read.
Do you handle operations after deployment?
Yes, depending on your needs: knowledge transfer to your team with documentation, or a maintenance and monitoring contract including updates, alert review and regular cost optimisation.
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Tell us about your project
Describe your need in a few lines: we come back to you with a first analysis and the next steps.