Email Setup: SMTP
Set up outgoing email for Tymeslot via SMTP. Covers booking confirmations, reminders, and password resets. Includes steps for Gmail, SendGrid, and Amazon SES.
About
Luka Breitig created and maintains Tymeslot. He built the scheduling engine, the CalDAV sync layer, the Phoenix LiveView booking UI, and the embeddable widget infrastructure: the systems documented in these pages. He works as a software engineer and AI developer, based in Warsaw, Poland.
His technical focus sits across two areas:
- Elixir and Phoenix LiveView: production backend services, real-time interfaces, and self-hostable platform architecture
- AI-assisted development: LLM integration, RAG pipelines, and agentic workflows built with Claude and OpenAI
His other live projects include In A Nutshell (AI semantic search for video content with timestamp citations) and Transvexis (multilingual translation serving clients in 39+ languages).
Alongside building, Luka trains engineering teams on AI-assisted software development: agentic workflows, AI code review, and navigating unfamiliar codebases with tools like Claude Code and Cursor. He delivers workshops for organisations including NobleProg and Cegos Integrata, and has spoken at international developer conferences on AI integration and production patterns.
Expertise
Elixir
Phoenix LiveView
Phoenix Framework
AI-Assisted Development
AI & Large Language Models
RAG Systems
Prompt Engineering
PostgreSQL
Docker
Self-Hosting
Workflow Automation
n8n
Python
Experience
- Author and maintainer of Tymeslot, built in Elixir and Phoenix LiveView
- Ships production software daily using AI-assisted development tooling
- Delivers AI-assisted development training for NobleProg, Cegos Integrata, and engineering teams across Europe
Education
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Psychology BSc 2010–2013University of Osnabrück
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Management MA 2013–2016Zeppelin University, Friedrichshafen, Germany
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SDW Scholar, German Foundation of Business (Top 2%)
Articles by Luka
Page 3 of 7Email Setup: Postmark
Configure Postmark for Tymeslot transactional email. Covers domain verification, DKIM/SPF setup, and delivery tracking for better deliverability than standard SMTP.
Google OAuth App Setup
Set up a Google OAuth app in Google Cloud Console. One app powers Google Login, Calendar sync, and Meet rooms for Tymeslot. Covers API enabling and consent screen.
Microsoft Azure App Setup
Register an Azure app for Tymeslot. Enables Outlook Calendar sync and Teams meetings. Covers API permissions and admin consent requirements.
Configure GitHub OAuth Sign-In for Tymeslot
Let your team and customers sign in to Tymeslot with their GitHub account. Create an OAuth app, set two environment variables, and you're done.
Generic SSO (OAuth / OIDC)
Connect any OAuth 2.0 / OpenID Connect identity provider for single sign-on. Supports Keycloak, Authentik, Lemonldap::NG, Okta, Azure AD, and more.