cornerstones.dev

What It Is

CornerStones is an engineering-delivery-focused technology agency that uses a Dedicated Squad / Squad-as-a-Service model to build external high-performance engineering teams for enterprises. It is not positioned as a standalone developer tool or SaaS platform, but rather as a provider of consulting, development, and operations delivery around Agentic AI, Secure RAG, high-performance web/e-commerce, predictive operations, and data architecture.

Core Capabilities and Tech Stack

Based on the information on its website, CornerStones’ strengths lie in complex systems integration. Multi-agent workflows use AutoGen, MCP, and LangChain; RAG and knowledge engineering involve LlamaIndex, Pinecone, pgvector, Milvus, vector databases, and RBAC; web and e-commerce work covers React, Next.js, GraphQL, Shopify Plus, and Headless WordPress; cloud data and operations include AWS, Kubernetes, Terraform, Airflow, Kafka, Snowflake, MLflow, and more. Its service process includes architecture audits, squad formation, agile sprints, and MLOps/maintenance.

Pricing and Delivery Model

Pricing on the official website is relatively transparent: the Core MVP Squad costs $15,000–$25,000/month, while the Elite AI & Data Squad costs $30,000–$45,000/month. For fixed-scope projects, Custom SaaS Build starts at $50,000–$100,000+, and Enterprise AI/RAG starts at $40,000–$80,000+. Hourly staff augmentation is also available, with U.S. architects priced at $150–$225/hour and senior engineers in India at $65–$110/hour. Overall, it sits in the mid-to-high-end enterprise services price range.

Pros and Cons

The main advantages are its broad engineering coverage, publicly listed pricing ranges, and explicit emphasis on security requirements such as 100% IP ownership, GDPR, ISO 27001, RBAC, and encryption in transit and at rest. It should appeal to companies that need to quickly add AI, DevOps, data, and frontend architecture capabilities. The limitation is that it is not a self-service tool: there are no public APIs/SDKs, open-source repositories, or developer documentation. The case-study metrics are taken from the company’s own website, so buyers should still validate them through technical due diligence, contractual SLAs, and customer references before procurement.

Who It’s For and Access from China

CornerStones is best suited to companies with a clear budget that need an external team to deliver enterprise RAG, AI Agents, SaaS refactoring, Headless Commerce, or data platforms. It is less suitable for individual developers, early-stage low-budget teams, or users who simply want to buy standardized development tools. The main content does not state how well the site works from mainland China, and payment methods are not disclosed. If network access, cross-border payments, or time-zone collaboration are constraints, alternatives could include domestic AI consulting and custom development teams, or services such as Toptal, Andela, Thoughtworks, and EPAM.