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Peter Kowalczyk

Full-Stack AI Product Engineer | ex-CTO Pineapple Builder | PostgreSQL & Relational Architecture

Location:London, United Kingdom (London, United Kingdom · Hybrid)
Timezone:Europe/London
Experience:11 Years
Direct Rate
$50–$110/ hour (USD)
Available for Projects

No middleman platform markups. Direct contact.

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About & Engineering Approach

Full-Stack engineer and ex-CTO of the Pineapple Builder platform with 11+ years of commercial experience. Personally designed and led the PostgreSQL relational database architecture for a full-featured site builder, ensuring high content throughput via a GraphQL API. As Member of Technical Staff at DevRev, built the Agent Studio agentic platform core and agent connections to tools and databases.

Core Technologies & Competencies

Primary Specializations

PostgreSQL

All Technologies & Tools

Founding Engineer
PostgreSQL
Relational Database Schema Design
Normalization
Indexes
Stored Procedures
Node.js
TypeScript
Graphql
Rest Apis
React Js
Next.js
App Router
Server Components
Docker
AWS
Cloud Environments
Ai Agents
Data Security
Web Service Performance Optimization

Commercial Experience

Member of Technical Staff @ DevRev (Full-time)

2025-10-01 — 2026-06-01

Developing an AI platform; agentic loop architecture and workflow execution.

CTO @ Pineapple Builder (Full-time)

2021-04-01 — 2026-06-01

Leading all product architecture: PostgreSQL relational database design, GraphQL backend, and Next.js frontend.

Selected Portfolio & Deliverables

SaaS BuilderDeveloper Tools

Pineapple builder database

60-table PostgreSQL relational schema powers a site builder for 90K pages; normalization and GIN indexes sped up page publishing 4x.

postgresql
typescript
graphql
nextjs
docker
AI PlatformSoftware

DevRev agent studio store

Agent-run store holds 500K executions per month; optimized PostgreSQL queries cut context-fetch latency from 700 to 140 ms.

postgresql
typescript
nodejs
graphql
aws
InfrastructureWeb Services

Content delivery cache layer

Redis caching layer in front of PostgreSQL handles 15K requests per minute; 91% hit rate, DB read costs down 45%.

postgresql
redis
nextjs
docker
aws

Vetting Standards

Verified
Identity & Commercial Track RecordVerified past employment and client references.
Code
Code & Architecture AuditAssessed on production code standards and type safety.
Security
Direct Contract SupportNo platform lock-in. Work directly with clear terms.

Languages

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