Available for new engagements

Hi, I'm Ayhan Sipahi.

I'm an independent software consultant in Berlin. I help product teams ship software systems that keep working after the team that built them has moved on.

Most of my work is TypeScript and AWS: application code, CDK infrastructure, and how the two fit together. The writing here comes from that work. Every post is published in English and Turkish.

Read the writing Work with me

Latest posts and notes

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Model Tier or Harness? What Decides Agentic Coding Quality August 16, 2026

When a coding agent underperforms, the reflex is a stronger model. On bounded tasks the harness moves the score at least as much; a rule for which lever to pull.

Dogwood: Temporal Authorization for AI Agents August 7, 2026

How AWS Dogwood adds temporal conditions to Cedar policies, lowers them back to plain Cedar, and enforces agent guardrails at the Amazon Bedrock AgentCore gateway.

Where Should Claude Code Run? Devcontainer, Codespaces, or MicroVM August 4, 2026

Devcontainers, Codespaces and AWS Lambda MicroVMs as homes for a coding agent: what each rung adds, what it costs, and when moving the agent off the laptop pays off.

New here? Start with Comparing TypeScript Formatting and Linting Tools: Biome, Oxlint, ESLint, and Prettier · Understanding Career Levels in Tech - From Entry to Distinguished Engineer · MCP vs Direct API Access for AI Agents: When to Skip the MCP Layer

Selected outcomes

“In 4 months, we moved our core platform from a legacy setup to a cloud-native architecture with less operational friction.”

Engineering Lead (FinTech)

“With a focused AWS and serverless redesign, we reduced annual infrastructure spend by around $200K.”

Technology Lead (E-commerce)

How I can help

Focused support for architecture and delivery decisions.

Architecture Review

A focused review of your system: code, AWS infrastructure, and delivery pipeline. You get a written, prioritized set of findings and a practical technical direction.

Fixed scope · typically 1–2 weeks

Technical Advisory

Ongoing advisory for product and engineering teams: architecture decisions, delivery unblocking, and a second pair of senior eyes when it matters.

Retainer · a few hours a week

Want to work together? Get in touch.

~/Hi, I'm Ayhan Sipahi.