Fränz Friederes
@fraenz.frieder.es
Solo Software Engineer at wierk.lu building a SaaS for DMARC monitoring dmarced.eu, deciphering Enigma cryptograms, and chasing sneaker drops, he/him 🏳️🌈
Yes, #serverless still runs on servers.
The difference? They’re not mine to worry about.
The difference? They’re not mine to worry about.
July 14, 2025 at 5:48 PM
Yes, #serverless still runs on servers.
The difference? They’re not mine to worry about.
The difference? They’re not mine to worry about.
This is Rocky a.k.a. Klenge Miiss
July 11, 2025 at 6:32 PM
This is Rocky a.k.a. Klenge Miiss
7,500 women helped end WWII at Bletchley Park. Pamela Downing was one of them. I wanted her name on the wall.
July 11, 2025 at 2:31 PM
7,500 women helped end WWII at Bletchley Park. Pamela Downing was one of them. I wanted her name on the wall.
Sequential IDs are faster. UUIDs are safer.
I wanted both speed and security, so I picked both.
I wanted both speed and security, so I picked both.
July 10, 2025 at 9:29 AM
Sequential IDs are faster. UUIDs are safer.
I wanted both speed and security, so I picked both.
I wanted both speed and security, so I picked both.
After a year of building my SaaS, I finally integrated Stripe for self-service subscriptions.
I almost overengineered billing before ever charging anyone.
I almost overengineered billing before ever charging anyone.
July 9, 2025 at 2:14 PM
After a year of building my SaaS, I finally integrated Stripe for self-service subscriptions.
I almost overengineered billing before ever charging anyone.
I almost overengineered billing before ever charging anyone.
My SaaS frontend, built on Next.js, never gets to see a session token.
No shared cookies, headers, or credentials.
Just a clean API boundary — on purpose.
No shared cookies, headers, or credentials.
Just a clean API boundary — on purpose.
July 8, 2025 at 9:57 AM
My SaaS frontend, built on Next.js, never gets to see a session token.
No shared cookies, headers, or credentials.
Just a clean API boundary — on purpose.
No shared cookies, headers, or credentials.
Just a clean API boundary — on purpose.
IP addresses are not for humans.
But DMARC reports are full of them, leaving users staring at logs instead of insights.
So I enrich them with metadata like country and network owner (ASN) from IPinfo's free dataset, without compromising privacy.
But DMARC reports are full of them, leaving users staring at logs instead of insights.
So I enrich them with metadata like country and network owner (ASN) from IPinfo's free dataset, without compromising privacy.
July 7, 2025 at 3:39 PM
IP addresses are not for humans.
But DMARC reports are full of them, leaving users staring at logs instead of insights.
So I enrich them with metadata like country and network owner (ASN) from IPinfo's free dataset, without compromising privacy.
But DMARC reports are full of them, leaving users staring at logs instead of insights.
So I enrich them with metadata like country and network owner (ASN) from IPinfo's free dataset, without compromising privacy.
Most of my incoming email traffic hits all at once: around midnight and noon. I needed a system that could absorb the spikes and survive broken code when I ship it.
Here’s the architecture I landed on.
Here’s the architecture I landed on.
July 4, 2025 at 9:15 AM
Most of my incoming email traffic hits all at once: around midnight and noon. I needed a system that could absorb the spikes and survive broken code when I ship it.
Here’s the architecture I landed on.
Here’s the architecture I landed on.
Just shipped a tiny feature that made a huge difference: sparklines.
These tiny charts now show trends in email volume inside each table cell: spikes, drops, and suspicious patterns.
At a glance, they say more than words and numbers ever could.
These tiny charts now show trends in email volume inside each table cell: spikes, drops, and suspicious patterns.
At a glance, they say more than words and numbers ever could.
July 3, 2025 at 9:58 AM
Just shipped a tiny feature that made a huge difference: sparklines.
These tiny charts now show trends in email volume inside each table cell: spikes, drops, and suspicious patterns.
At a glance, they say more than words and numbers ever could.
These tiny charts now show trends in email volume inside each table cell: spikes, drops, and suspicious patterns.
At a glance, they say more than words and numbers ever could.
February 5, 2025 at 10:45 AM
What is 0? What is 10? The number of friends I likely am recommending them to? #feedback #emailtemplate
December 1, 2024 at 9:05 AM
What is 0? What is 10? The number of friends I likely am recommending them to? #feedback #emailtemplate
In today's dmarced refactor, I moved all messages to a separate #Monorepo package called "intl". It relies on Format.js while email rendering depends on react-email and react-intl. It's amazing that I can hand over i18n logic from non-React library code to TSX. #React #TypeScript #BuildInPublic
November 27, 2024 at 11:22 PM
In today's dmarced refactor, I moved all messages to a separate #Monorepo package called "intl". It relies on Format.js while email rendering depends on react-email and react-intl. It's amazing that I can hand over i18n logic from non-React library code to TSX. #React #TypeScript #BuildInPublic
Rethinking #email traffic: How source categorization helps you make your #DMARC insights actionable. A #BuildInPublic thread 🧵 1/10
November 20, 2024 at 11:37 AM
Rethinking #email traffic: How source categorization helps you make your #DMARC insights actionable. A #BuildInPublic thread 🧵 1/10