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Konstantinos Giamalis

Hi, I'm Konstantinos Giamalis, Co-founder at Proper.

We're modernizing property management in Greece, an industry that still runs on phone calls and paper.

Previously: 9+ years in product leadership across companies like efood, DeliveryHero, and instacar.

This is my personal journal. I write short, opinionated posts about leadership, decision-making, and building a company. Mostly short, always honest.

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Discover more about me and my career journey in the biography section.
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🧠 Quick takes

✏️ Deep dives

📖 Currently reading

Leadership lessons from KolokotronisLeadership lessons from Kolokotronis
Leadership lessons from Kolokotronis
Leadership
On constraintsOn constraints
On constraints
DecisionMaking
Behind Closed DoorsBehind Closed Doors
Behind Closed Doors
Lifestyle
Signal vs NoiseSignal vs Noise
Signal vs Noise
DecisionMaking
On delegationOn delegation
On delegation
LeadershipDecisionMaking
Best strategy tip with 2 lettersBest strategy tip with 2 letters
Best strategy tip with 2 letters
PlanningLeadershipPrioritization
How Many Project Management Tools?How Many Project Management Tools?
How Many Project Management Tools?
Product Management
Scope vs DeadlineScope vs Deadline
Scope vs Deadline
Productivity
Simple & Easy?Simple & Easy?
Simple & Easy?
Product Management
[Notes] PM Habits Seminar: Get Shit Done by Shreyas Doshi[Notes] PM Habits Seminar: Get Shit Done by Shreyas Doshi
[Notes] PM Habits Seminar: Get Shit Done by Shreyas Doshi
ProductivityProduct Management
9 years, 9 lessons9 years, 9 lessons
9 years, 9 lessons
Leadership
Made to be hitMade to be hit
Made to be hit
Product Management
A book about politics?A book about politics?
A book about politics?
ProductivityLifestyle
Universal Analytics: End of an eraUniversal Analytics: End of an era
Universal Analytics: End of an era
Product Management
#1 thing to do when you start a new job#1 thing to do when you start a new job
#1 thing to do when you start a new job
MarketplaceProductivity
[Hot take] End of Software?[Hot take] End of Software?
[Hot take] End of Software?
Product ManagementAI
From Marketing to Product and vice versaFrom Marketing to Product and vice versa
From Marketing to Product and vice versa
MarketingProduct Management
[Guide] Product hiring framework[Guide] Product hiring framework
[Guide] Product hiring framework
LeadershipProduct Management
Agile Marketing chatbotAgile Marketing chatbot
Agile Marketing chatbot
AIMarketing
Ways to Become a Product Manager #1Ways to Become a Product Manager #1
Ways to Become a Product Manager #1
Product Management
A Beginner's guide on how to use Tag Manager in GA4A Beginner's guide on how to use Tag Manager in GA4
A Beginner's guide on how to use Tag Manager in GA4
Data
The first PMThe first PM
The first PM
Product ManagementLeadership
Two Books Worth Revisiting Every YearTwo Books Worth Revisiting Every Year
Two Books Worth Revisiting Every Year
Book
What’s your shape?What’s your shape?
What’s your shape?
ProductivityProduct Management
Global maximaGlobal maxima
Global maxima
DecisionMaking
[Step by step] How to build a chatbot using openAI, Langchain & Streamlit.[Step by step] How to build a chatbot using openAI, Langchain & Streamlit.
[Step by step] How to build a chatbot using openAI, Langchain & Streamlit.
AICode
[Review] Langchain with Python bootcamp[Review] Langchain with Python bootcamp
[Review] Langchain with Python bootcamp
AI
Lessons on adviceLessons on advice
Lessons on advice
Leadership
The curse of knowledgeThe curse of knowledge
The curse of knowledge
Leadership
[Guide] Anomaly detection algorithm [Guide] Anomaly detection algorithm
[Guide] Anomaly detection algorithm
DataCode
Awareness testAwareness test
Awareness test
DecisionMakingAnalytical thinking
ResultingResulting
Resulting
DecisionMaking
The Tail End theoryThe Tail End theory
The Tail End theory
Productivity
[Review] LangChain for LLM Application Development[Review]
[Review] LangChain for LLM Application Development
AI
An interesting retention campaignAn interesting retention campaign
An interesting retention campaign
Marketing
Ask Great QuestionsAsk Great Questions
Ask Great Questions
Analytical thinking
User acquisition KPI #2User acquisition KPI #2
User acquisition KPI #2
Data
User acquisition KPI #1User acquisition KPI #1
User acquisition KPI #1
Data
[Review] AI worskhop for Senior PMs[Review] AI worskhop for Senior PMs
[Review] AI worskhop for Senior PMs
AI
Path to masteryPath to mastery
Path to mastery
LeadershipBook
Don’t start as PMDon’t start as PM
Don’t start as PM
Product Management
A typical PM dayA typical PM day
A typical PM day
Productivity
How to do great workHow to do great work
How to do great work
Leadership
The inertia lawThe inertia law
The inertia law
DecisionMaking
Flawed conversionsFlawed conversions
Flawed conversions
Data
Coding or thinking?Coding or thinking?
Coding or thinking?
Analytical thinking
ChatGPT4 system card summaryChatGPT4 system card summary
ChatGPT4 system card summary
AI
Good/Bad questionsGood/Bad questions
Good/Bad questions
DecisionMakingBook
Marketplace 100 report (2023)Marketplace 100 report (2023)
Marketplace 100 report (2023)
Product ManagementMarketplace
Are you a gamer?Are you a gamer?
Are you a gamer?
Productivity
Prompting as a skillPrompting as a skill
Prompting as a skill
ProductivityAI
Simple prioritization frameworkSimple prioritization framework
Simple prioritization framework
PlanningProduct Management
The most important stakeholderThe most important stakeholder
The most important stakeholder
Leadership
Simple products, big impactSimple products, big impact
Simple products, big impact
Product Management
The most important user metric/featureThe most important user metric/feature
The most important user metric/feature
Data
Obstacle is the wayObstacle is the way
Obstacle is the way
LeadershipBook
Outwork everyoneOutwork everyone
Outwork everyone
Leadership
A hidden metric: StDevA hidden metric: StDev
A hidden metric: StDev
Data
Acropolis.comAcropolis.com
Acropolis.com
Product Management
Reading the mindReading the mind
Reading the mind
DecisionMaking
DetailsDetails
Details
Product Management
A useful hiring questionA useful hiring question
A useful hiring question
Productivity
CareCare
Care
Leadership
Time doesn’t scaleTime doesn’t scale
Time doesn’t scale
Productivity
Skills versus luckSkills versus luck
Skills versus luck
LeadershipBook
JFDIJFDI
JFDI
Planning
Why you should read booksWhy you should read books
Why you should read books
Productivity
Take it personallyTake it personally
Take it personally
Leadership
Lead by exampleLead by example
Lead by example
Leadership
Experience: shocks vs yearsExperience: shocks vs years
Experience: shocks vs years
Leadership
40Hz: The frequency of focus40Hz: The frequency of focus
40Hz: The frequency of focus
Productivity
The OKRs paradoxThe OKRs paradox
The OKRs paradox
Planning
The initiatorThe initiator
The initiator
Leadership
How to choose what to readHow to choose what to read
How to choose what to read
Productivity
The mother of (most) frameworksThe mother of (most) frameworks
The mother of (most) frameworks
Planning
Know yourselfKnow yourself
Know yourself
Leadership
Social Touring GameSocial Touring Game
Social Touring Game
DecisionMaking
Extra MileExtra Mile
Extra Mile
Leadership
[Guide] Two decision making frameworks (+books)[Guide] Two decision making frameworks (+books)
[Guide] Two decision making frameworks (+books)
DecisionMakingPrioritization
[Guide] PM Growth assessment example[Guide] PM Growth assessment example
[Guide] PM Growth assessment example
Product Management
[Guide] What is a good conversion rate? [Guide]
[Guide] What is a good conversion rate?
Data
[Essay] A strange A/B test[Essay] A strange A/B test
[Essay] A strange A/B test
MarketingData
[Guide] Attribution Models: Beyond Last Click[Guide]
[Guide] Attribution Models: Beyond Last Click
Marketing

Books I read and recommend:

ALCHEMYALCHEMY
ALCHEMY
THE COMFORT CRISISTHE COMFORT CRISIS
THE COMFORT CRISIS
THE MOM TESTTHE MOM TEST
THE MOM TEST
FOOLED BY RANDOMENESSFOOLED BY RANDOMENESS
FOOLED BY RANDOMENESS
THINKING IN BETSTHINKING IN BETS
THINKING IN BETS
RANGERANGE
RANGE
SIGNAL AND THE NOISESIGNAL AND THE NOISE
SIGNAL AND THE NOISE
HOOKEDHOOKED
HOOKED
PRINCIPLESPRINCIPLES
PRINCIPLES
BUILDBUILD
BUILD
INSPIREDINSPIRED
INSPIRED
LEAN PRODUCT HANDBOOKLEAN PRODUCT HANDBOOK
LEAN PRODUCT HANDBOOK
DAVID & GOLIATHDAVID & GOLIATH
DAVID & GOLIATH
OUTLIERSOUTLIERS
OUTLIERS
HIGH OUTPUT MANAGEMENTHIGH OUTPUT MANAGEMENT
HIGH OUTPUT MANAGEMENT
THE HARD THING ABOUT HARD THINGSTHE HARD THING ABOUT HARD THINGS
THE HARD THING ABOUT HARD THINGS
ATOMIC HABITSATOMIC HABITS
ATOMIC HABITS
REWORKREWORK
REWORK
NOISENOISE
NOISE
CHECKLIST MANIFESTOCHECKLIST MANIFESTO
CHECKLIST MANIFESTO
FACTFULNESSFACTFULNESS
FACTFULNESS
SYSTEM DESIGN INTERVIEWSYSTEM DESIGN INTERVIEW
SYSTEM DESIGN INTERVIEW
GROKKING ALGORITHMSGROKKING ALGORITHMS
GROKKING ALGORITHMS
DESIGN OF EVERYDAY THINGSDESIGN OF EVERYDAY THINGS
DESIGN OF EVERYDAY THINGS
UPSTREAMUPSTREAM
UPSTREAM
GOOD STRATEGY BAD STRATEGYGOOD STRATEGY BAD STRATEGY
GOOD STRATEGY BAD STRATEGY
ON WRITING: A MEMOIR OF THE CRAFTON WRITING: A MEMOIR OF THE CRAFT
ON WRITING: A MEMOIR OF THE CRAFT
THIS IS MARKETINGTHIS IS MARKETING
THIS IS MARKETING
LINCHPINLINCHPIN
LINCHPIN
PURPLE COWPURPLE COW
PURPLE COW
MADE TO STICKMADE TO STICK
MADE TO STICK
THE SCORE WILL TAKE CARE OF ITSELFTHE SCORE WILL TAKE CARE OF ITSELF
THE SCORE WILL TAKE CARE OF ITSELF
Predictably IrrationalPredictably Irrational
Predictably Irrational
THINKING FAST & SLOWTHINKING FAST & SLOW
THINKING FAST & SLOW

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Opinions expressed are solely my own and do not necessarily express the views or opinions of my employer. All rights reserved.

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