Mourjo Sen

Property Based Testing: Avoid Accidental Quality (Mourjo Sen) YouTube video by Tech Excellence

I spoke at TechExcellence.io about accidental quality - why bugs get shipped even though tests pass.

www.youtube.com/live/8ONG4nJ...

Property Based Testing: Avoid Accidental Quality (Mourjo Sen) YouTube video by Tech Excellence

I recently spoke at Tech Excellence meet-up about property based tests! Link below👇

www.youtube.com/live/8ONG4nJ...

I am speaking at API days Bangalore! Sign up with my code for a free ticket: I_KNOW_MOURJO_SEN

confengine.com/conferences/...

"We have to do the things [like documentation] that make human engineers better
before we can delegate to machines"
- Dave Williams
#o11yDaySF @honeycomb.io

I’m speaking at techsummit.io in a couple of weeks! 🥳🎉😁

GitHub - mourjo/quick-meetings: A meeting scheduling application with bugs lurking in the dark that Property-Based Tests find! A meeting scheduling application with bugs lurking in the dark that Property-Based Tests find! - mourjo/quick-meetings

Test cases only catch bugs if you know where they are. Paradoxically, it is ineffective for unknown unknowns.

Property-based tests don't ask you for examples - it generates them. You define the properties of your application, the system finds bugs.

github.com/mourjo/quick...

In front of the majestic Alps, I felt tiny, insignificant but also very liberated.

They are impervious - whether I fail or succeed. Nothing I do will ever change the Alps. I suddenly didn’t feel afraid of failing, taking chances, experimenting.

Feeling tiny is liberating. Empowering. Unlimited.

YouTube video by intersoft GmbH Property Based Testing to Preseve Invariants - Fachtalk mit Mourjo Sen beim techCamp

What’s the difference between testing 🧪for bugs and searching 🔍 for bugs?

Property based tests search for unknown unknowns 🕵️ without relying on the programmer’s ability to enumerate test cases.

Hear more in my recent talk 👇
www.youtube.com/watch?v=5tCz...

YouTube video by intersoft GmbH Property Based Testing to Preseve Invariants - Fachtalk mit Mourjo Sen beim techCamp

What’s the difference between testing 🧪for bugs and searching 🔍 for bugs?

Property based tests search for unknown unknowns 🕵️ without relying on the programmer’s ability to enumerate test cases.

Hear more in my recent talk 👇
www.youtube.com/watch?v=5tCz...

#infoqarticlecontest #softwarearchitecture #infoqarticlecontest | InfoQ 🙌 Congratulations to Mourjo Sen, who won the second prize in the #InfoQArticleContest for his article, "Applying Flow Metrics to Design Resilient Microservices". You can read the article her...

My @infoq.com article won the second prize in the 2025 Article Contest, check it out!

www.linkedin.com/posts/infoq_...

YouTube video by ScyllaDB Monster Scale Summit 2025 | What Flow Metrics Teaches Us by Mourjo Sen

I presented a talk at Monster Scale 2025, video is out now

@scylladb.com #resilience #microservices #softwaredesign

This IS addictive but also very fun, thanks!

Software design with resilience embraces the reality that failure is inevitable!

We leverage #FlowMetrics (crucial for software delivery!) to measure & improve system resilience.

Dive into the #InfoQ article by @mourjo.me for deeper insights!

🔗 bit.ly/3Y5WMyJ

#Microservices #Performance #Metrics

​​Applying Flow Metrics to Design Resilient Microservices Software design with resilience is an acknowledgement to the reality that everything fails. We put metrics in place to help us detect and resolve such problems and failures. Flow metrics, commonly use...

Wrote an article on system agnostic resilience on @infoq.com check it out 👇

A Look Back On Bill Gates' New Rules This is article captures my notes and excerpts from Bill Gates’ 1999 article, New Rules, about how businesses should transform themselves in the new millennium.

The Internet helped create Adam Smith’s ideal marketplace, in which buyers and sellers find each other. The Internet did not replace people. It made them more efficient.

This is one of ten key ideas I took down from a memo Bill Gates wrote in 1999, all of which are still so relevant today:

A team that is overworked does not perform well - nor does a server that is overloaded. What lessons can performant software supply chain teach us about microservice design?

I will speak about this topic at @scylladb.com Monster Scale Summit. Sign up today: www.scylladb.com/monster-scal...

Learning In Sprints The last lecture finished by three in the afternoon. Yet on most days, I did not leave the St Xavier’s college campus until five – I recall spending two hours at the central library reading William St...

I spent more hours learning in school but I learnt a lot more in college. A method I call "learning in sprints" combines the time-bounded structure of school education with the intuition and applicability of college education, and it works wonders.

How A Screen Protector Increased My Productivity “If you care about keeping your phone code secret, you should use this”, the seller said, emphatically pointing to the privacy screen guard. I knew about privacy-protecting screen guards, but I was no...

A story about how I subconsciously started spending less time on my phone, how a privacy screen protector nudged me towards doing other – more productive – things than looking at reels on Youtube.

My mental model of the how the corporate business works gets better as I speak to more people.

The best thing about this is, while I’m helping someone succeed I am really helping myself.

mourjo.me/blog/musings...

Here is the link to the tweet:
x.com/redrapids/st...

Killing me softly: Graceful shutdowns in Clojure A walkthrough of what happens in the JVM during shutting down a Clojure service and how best to go about it without losing any invariants

Here is the post I refer to:

The only reason I can't leave Twitter is because of the years of history I have with it -- like getting a retweet from Bruce Tate on a post I wrote. Sigh, on Twitter today, I just expect onlyfans accounts to react to my posts... I mean tweets.

I was having a tough day, this made me smile. Thank you for sharing.

Thanks!

I would love for my blogs to be indexed in mini feed - thanks in advance!

mourjo.medium.com
mourjo.me/blog

Three reasons why developers should use DuckDB Developers often have to analyse data, e.g. assessing the impact of an outage. DuckDB is a single tool for querying multiple data sources.

@duckdb.org is a data engineering tool that is a must-have for software engineers. A data perspective is invaluable for a software engineer - from counting unique IDs in a CSV to parsing JSON logs to find failure patterns.

Here are three compelling reasons for us developers to start using DuckDB

Overcoming Barriers To Entry: Writing With Obsidian “In ten years you’ll see me as a writer”. My 2008 yearbook would be disappointed in how things turned out. But it is the new year and it is never too late to start.

While at the surface writing does not seem to be a hard requirement of the software engineer’s job, structured thinking is. Writing helps convoluted, passing thoughts take a more permanent form, which my future self can come back to – ideas fleet, written artefacts remain.

mourjo.me/blog/musings...