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Sascha Mirow-Stanitzok

Team lead Middleware at freenet. Building serverless systems on AWS since the early days: Serverless Framework, CDK, TypeScript, Lambda and event-driven design. Hands-on guides at sascha-ms.de

Location Büdelsdorf, Germany Joined Joined on  Personal website https://sascha-ms.de/en

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He / him

Work

Team Lead Middleware at freenet

ElastiCache vector search: hybrid search from Lambda
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ElastiCache vector search: hybrid search from Lambda

#aws #database #search #serverless
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19 min read

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TypeScript 7 Migration: Lambda and CDK Projects
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TypeScript 7 Migration: Lambda and CDK Projects

#aws #backend #devops #typescript
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17 min read
AgentCore Web Search API: web search without a gateway
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AgentCore Web Search API: web search without a gateway

#agents #api #aws #serverless
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18 min read
SQS dead-letter queue: alarm, triage and redrive
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SQS dead-letter queue: alarm, triage and redrive

#aws #infrastructure #monitoring #serverless
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18 min read
Team Working Agreements: Template and Workshop
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Team Working Agreements: Template and Workshop

#career #management #productivity
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11 min read
Secrets in GitHub Actions logs: find and prevent leaks
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Secrets in GitHub Actions logs: find and prevent leaks

#cicd #devops #github #security
Comments 2
15 min read
Monte Carlo forecasting: delivery dates without story points
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Monte Carlo forecasting: delivery dates without story points

#agile #productivity #softwaredevelopment
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14 min read
Setting WIP limits: a guide for Kanban teams
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Setting WIP limits: a guide for Kanban teams

#agile #management #productivity
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11 min read
uv for AWS Lambda: Packaging Python Dependencies
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uv for AWS Lambda: Packaging Python Dependencies

#aws #devops #python #serverless
1
Comments
13 min read
Claude Fable 5.2 migration for TypeScript backends
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Claude Fable 5.2 migration for TypeScript backends

#ai #api #claude #typescript
Comments
16 min read
cdk-nag v3: Security Checks in CDK Tests with Vitest
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cdk-nag v3: Security Checks in CDK Tests with Vitest

#aws #devops #security #testing
1
Comments
15 min read
DynamoDB transactions: TransactWriteItems with Lambda
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DynamoDB transactions: TransactWriteItems with Lambda

#aws #backend #database #serverless
1
Comments 1
18 min read
CloudWatch Logs retention policy for the whole account
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CloudWatch Logs retention policy for the whole account

#aws #devops #infrastructure #monitoring
1
Comments
14 min read
Metrics for AI-generated code: measure impact, not people
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Metrics for AI-generated code: measure impact, not people

#ai #management #productivity #softwaredevelopment
1
Comments
13 min read
DynamoDB optimistic locking: version numbers with Lambda
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DynamoDB optimistic locking: version numbers with Lambda

#architecture #aws #database #serverless
1
Comments
20 min read
Test CDK stacks: template assertions with Vitest
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Test CDK stacks: template assertions with Vitest

#aws #serverless #testing #typescript
1
Comments
15 min read
Consent decision making: a facilitation guide for teams
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Consent decision making: a facilitation guide for teams

#leadership #management #productivity
1
Comments
12 min read
Cut NAT gateway costs: cheaper Lambda in a VPC
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Cut NAT gateway costs: cheaper Lambda in a VPC

#aws #infrastructure #networking #serverless
1
Comments
17 min read
Claude IP allowlist: Lambda with a static egress IP
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Claude IP allowlist: Lambda with a static egress IP

#aws #networking #security #serverless
1
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17 min read
Serverless & AI in brief: week 45/2026
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Serverless & AI in brief: week 45/2026

#news #ai #aws #serverless
1
Comments
10 min read
Advice Process: How to Distribute Team Decisions
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Advice Process: How to Distribute Team Decisions

#leadership #management #productivity
1
Comments
10 min read
Architecture Decision Records: Template and Example
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Architecture Decision Records: Template and Example

#architecture #documentation #softwaredevelopment #softwareengineering
1
Comments
15 min read
Lambda Powertools for Python: logs, traces, metrics
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Lambda Powertools for Python: logs, traces, metrics

#aws #python #serverless #tutorial
1
Comments
14 min read
Lambda response streaming: live AI answers from Bedrock
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Lambda response streaming: live AI answers from Bedrock

#ai #aws #serverless #streaming
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14 min read
Clean Up Lambda Versions: Prune and S3 Reference Mode
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Clean Up Lambda Versions: Prune and S3 Reference Mode

#aws #cloud #devops #serverless
1
Comments
13 min read
SnapStart for Python: measure and cut Lambda cold starts
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SnapStart for Python: measure and cut Lambda cold starts

#aws #performance #python #serverless
1
Comments
16 min read
Lambda unit tests with Vitest: test TypeScript handlers
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Lambda unit tests with Vitest: test TypeScript handlers

#aws #serverless #testing #typescript
1
Comments
15 min read
Resolving team conflict: a guide for team leads
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Resolving team conflict: a guide for team leads

#career #leadership #management
1
Comments
12 min read
SSRF protection for webhooks: call user URLs safely
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SSRF protection for webhooks: call user URLs safely

#backend #cybersecurity #security #webdev
1
Comments
21 min read
Claim check pattern: large messages with S3 and SQS
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Claim check pattern: large messages with S3 and SQS

#architecture #aws #cloud #systemdesign
1
Comments
18 min read
Pull request template for AI-generated code
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Pull request template for AI-generated code

#ai #automation #github #softwareengineering
1
Comments
14 min read
Retry Budget in TypeScript: Stop Retry Storms
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Retry Budget in TypeScript: Stop Retry Storms

#architecture #backend #performance #typescript
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16 min read
How to Ask for Feedback as a Manager: Questions That Work
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How to Ask for Feedback as a Manager: Questions That Work

#career #leadership #management
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12 min read
How to Write a Runbook: Template and Lambda Examples
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How to Write a Runbook: Template and Lambda Examples

#devops #documentation #sre
1
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20 min read
Lambda SBOM: Which function ships which npm package?
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Lambda SBOM: Which function ships which npm package?

#aws #node #security #serverless
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16 min read
Avoid alert fatigue: alarms worth waking up for
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Avoid alert fatigue: alarms worth waking up for

#aws #devops #monitoring #sre
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17 min read
AgentCore Web Answer: cited web search for AI agents
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AgentCore Web Answer: cited web search for AI agents

#agents #ai #serverless #tools
1
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18 min read
Scheduled provisioned concurrency for AWS Lambda
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Scheduled provisioned concurrency for AWS Lambda

#aws #devops #performance #serverless
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14 min read
Automation bias: when teams trust AI blindly
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Automation bias: when teams trust AI blindly

#ai #codereview #management #softwareengineering
1
Comments 1
12 min read
Serverless Framework GitHub Actions: least-privilege deploys
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Serverless Framework GitHub Actions: least-privilege deploys

#aws #cicd #security #serverless
1
Comments
16 min read
How to run a game day: a playbook for failure drills
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How to run a game day: a playbook for failure drills

#devops #sre #testing
1
Comments
12 min read
Validate Lambda events with Powertools Parser and Zod
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Validate Lambda events with Powertools Parser and Zod

#aws #backend #serverless #typescript
1
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14 min read
Parameter Store data types: validate values on write
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Parameter Store data types: validate values on write

#aws #devops #serverless
1
Comments
16 min read
DynamoDB Bulk Put Items: Load S3 Data into Existing Tables
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DynamoDB Bulk Put Items: Load S3 Data into Existing Tables

#aws #database #serverless #tutorial
1
Comments
18 min read
GitHub Actions OIDC: AWS deploys without access keys
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GitHub Actions OIDC: AWS deploys without access keys

#aws #cicd #devops #security
1
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13 min read
CloudWatch API key: OpenTelemetry traces without SigV4
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CloudWatch API key: OpenTelemetry traces without SigV4

#api #aws #cloud #monitoring
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15 min read
On-call rotation: how to organize it fairly
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On-call rotation: how to organize it fairly

#devops #leadership #management #sre
1
Comments 2
8 min read
AWS FIS Lambda: chaos experiments step by step
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AWS FIS Lambda: chaos experiments step by step

#aws #devops #serverless #testing
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16 min read
Claude Message Threads API: Agent Loops in TypeScript
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Claude Message Threads API: Agent Loops in TypeScript

#agents #api #claude #typescript
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16 min read
Incident Commander Role: A Guide for Small Teams
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Incident Commander Role: A Guide for Small Teams

#devops #leadership #sre
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12 min read
Validate Environment Variables in Lambda with Zod
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Validate Environment Variables in Lambda with Zod

#aws #backend #serverless #typescript
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13 min read
Blameless postmortem: process, questions and template
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Blameless postmortem: process, questions and template

#devops #leadership #management #sre
Comments 1
12 min read
Lambda Powertools TypeScript: logs, metrics, traces
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Lambda Powertools TypeScript: logs, metrics, traces

#aws #serverless #typescript
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15 min read
Agent Package Manager: Keep Skills Updated with Dependabot
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Agent Package Manager: Keep Skills Updated with Dependabot

#agents #ai #automation #github
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14 min read
Reduce Lambda Cold Starts: A TypeScript Guide
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Reduce Lambda Cold Starts: A TypeScript Guide

#aws #performance #serverless #typescript
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16 min read
pull_request_target blocked: fix workflows by Dec 2
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pull_request_target blocked: fix workflows by Dec 2

#devops #github #security
1
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13 min read
How to Run a Retrospective: Phases, Formats, Agenda
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How to Run a Retrospective: Phases, Formats, Agenda

#agile #management #productivity
1
Comments
11 min read
Kafka share groups with Lambda: set up queue mode
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Kafka share groups with Lambda: set up queue mode

#architecture #aws #backend #serverless
1
Comments
19 min read
AGENTS.md setup: one file for Claude, Copilot and Codex
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AGENTS.md setup: one file for Claude, Copilot and Codex

#agents #ai #claude #githubcopilot
2
Comments 3
16 min read
Giving feedback to your manager: a guide for developers
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Giving feedback to your manager: a guide for developers

#career #leadership #management
1
Comments
10 min read
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