Jessica Joy Kerr Profile picture
Apr 6 5 tweets 6 min read
How do you take a legacy system toward fast flow of change? @suksr takes us through an evolution
using wholistic approaches including DDD, Wardley Mapping, and Team Topologies #QConLondon
The Wardley Map is only part of Wardley Mapping. There’s a whole strategy cycle

from @suksr #QConLondon
Team Topologies has categories of teams, and even more important: consciously plan the interactions between teams

from @suksr #QConLondon
Domain Driven Design guides you toward: which domains are most key to your business? which should you buy? How many components can one team handle?

from @suksr #QConLondon
How do we get from here (inefficient, slow change) to there (more efficient, set up for fast flow)?

There was a very careful evolution with consideration for movement of knowledge

Keep an eye out for the video on @infoq

from @suksr #qconlondon

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More from @jessitron

Apr 6
Slow means risky. 130000 dev hours in a single weekend deploy

@audunstrand and @trulsjor #QConLondon
It’s not about how fast the team can program.
It’s about how fast the team can find solutions to each problem, uncover organizational secrets for how the domain works and should work.
There’s a conflict between cross-functional teams and the organizational hierarchy.

And alignment is a Challenge in autonomous teams
Read 12 tweets
Apr 6
Flow in a software team is a socio-technical property.
Dropping flow comes with downtime, bugs, and other general misery.

from @ntcoding #QConLondon
Enforcing the same JIRA workflow doesn’t make developers interchangable.
“It takes me weeks to develop rapport with teammates, months to learn domain and code, a few hours to learn a JIRA workflow.” @ntcoding #QConLondon
Smooth devex, sustainable flow:
“This is working in the government, six years ago.
No one else has an excuse anymore.”
@ntcoding #QConLondon
Read 4 tweets
Apr 5
This morning at #QConLondon , @glenathan tells a story of an experiment at Circle CI: for this greenfield project, let’s have NO LOGGING.
Instead of logs, events! that make traces!

“Events are good logs.”
They’re data-first instead of human-first; they wrap units of work with durations; they can be explored multiple ways

@glenathan #QConLondon
They found best practices like: wrap each unit of work; report errors in a standard field; use span names that are specific enough to tell you what’s happening but general enough for useful grouping.

~ @glenathan #QConLondon
Read 9 tweets
Apr 5
and now what we’ve all been waiting for: @KevlinHenney keynote #QConLondon

“If there’s any probability, even so close to zero it won’t fit in a floating point number, it is not impossible”
Representations are never perfect.
“Software development is the creation and maintaining of illusions.”
@KevlinHenney #QConLondon
Programming paradigms are ways to organize our illusions.
@KevlinHenney #QConLondon
Read 11 tweets
Apr 4
A deep Java performance talk that I don’t have enough context for, by @PeterLawrey
Project Panama is about replacing JNI. Meantime, if you want to share memory between processes cleverly and safely, you can use their chronicle-bytes library. #QConLondon
“If you go down to the low level for too long, you wind up writing systems that can’t be altered.” @PeterLawrey #QConLondon
Read 5 tweets
Apr 4
Opening keynote at #qconlondon today: Sophie Wilson, microprocessor designer en.wikipedia.org/wiki/Sophie_Wi…
Moore’s Law was a self-fulfilling prophecy because microprocessor manufacturers set it as their goal to keep up with it.
- Sophie Wilson, #qconlondon
4000 transistors is critical mass for a microprocessor. Fewer than that, you can’t do enough.
Read 15 tweets

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