SWE & Architecture
I make mobile apps work really well, really quickly.
Hi! I'm
Nikita “Nek.12” Vaizin
I make apps 5x faster & devs 2x more productive. I audit & improve code, teach devs how to build well, and deliver at 100x value
I'm an expert in SWE, AI, and mobile apps, with strong UX taste and bias for speed. You can hire me to improve your business or get my free content to learn AI & insights from 6500 hours of coding
My Skills
I coded for 6000 hours, built 10+ apps with 1M+ users, and trained 300 devs. I'll make yours better too.
AI & DevEx
I make devs faster & happier with applied AI and developer tooling.
Psychology & UX
I turn users into fans through behavioral science and product design.
Leadership & Education
I turn juniors into seniors and boost team velocity
How I help teams ship better apps
I can audit code, analyze team dynamics, teach your devs a new stack, or solve a specific technical problem
Codebase health audit
I'll analyze your codebase and find how to improve performance, stability, and dev speed
Team velocity audit
Wonder why your devs are so slow? Not delivering? I'll be the unbiased third party that gives solutions
Stability & Performance audit
App is crashing? Bad reviews out of nowhere? Freezes? I will find the causes and how to fix them
System design
Building a complex app or system? I will design it end-to-end, so that your devs can execute unhindered
Team enablement
Onboarding, mentoring, interviewing, productivity audits, and training programs.
AI integration
Your devs can be 3x faster with AI. I will teach them how to and set everything up
Proven industry-leading expertise
My work is public & I got stats, testimonials, & reviews from my students, clients, and users
6,500+
hours spent coding
That's ~16 yrs of experience.
10+ apps
built for companies
Worked on apps with 1M DAU & $20M funding.
2 million
lines of code optimized
I made even the biggest apps better.
200-person
teams worked with
Led teams of 5+ engineers inside large orgs.
30+ interns
trained 0 -> middle
I trained interns, then they found jobs.
250+
students graduated
I taught CS at my country's most prestigious university
I make numbers go up
Before/after results from production apps.
App startup time
-15.3s17s → 1.7s
Optimized app startup - reduced churn by 43%.
Game loading time
-37.6s40s → 2.4s
Redesigned a game engine to cut loading times - doubled engagement.
Crash-free rate
+7.95%92% → 99.95%
Boosted an app from 1⭐ reviews to crash-free
ANR-free rate
+1.7%98.2% → 99.9%
Devs couldn't figure out where freezes are coming from. I did.
My projects
I built widely used products & apps and got hands-on experience shipping
FlowMVI
Kotlin Architecture Framework with 800 GitHub ⭐s.
- • 3rd most popular Kotlin architecture framework
- • Used in prod in commercial apps to deliver the results above
- • Loved by hundreds of devs for doubling their speed
Respawn
AI-powered self-improvement app built end-to-end by me.
- • 150k+ lines of code
- • 50k+ users
- • Revenue in production
Education & teaching
- BSc in Computer Science & Economics (GPA 9.5 honors diploma).
- Designed and taught a mobile development course for 200+ students.
- Built a training program and took 32 trainees from 0 to middle roles.
- Published scientific research papers.
Writing & community
- ~6,000 average views per article
- YouTube videos up to 4,000 views
- 500+ blog subscribers
- Speaker & Expert at Conferences
Click to expand
Recent posts
All my content is free forever & based on hands-on experience
I write because teaching and building are my passions.
AIDevelopment
What are AI agent skills and how to use them - complete breakdown with examples
Agent skills are a way to progressively disclose context to AI through markdown files, which saves tokens and boosts performance. I explain why you need them, when to use them, how to create them, and debunk the myths.
AIPersonal
I No Longer Write or Read Code. AI Does It Better Than Me
In December, AI models crossed a threshold after which I became useless as a programmer. Now I push code to prod that Ive never read.
DevelopmentAI
Agents and Gradle Dont Get Along - I Fixed It in Two Commands
Introducing ksrc - a CLI utility that simplifies searching and viewing Kotlin library source code from 15+ commands down to two for your AI agents.
Personal
Going independent for six months starting in 2026
Starting in 2026, Im going independent for at least six months - will be building my own product full-time and building in public.
Personal
Pulse in ChatGPT - how did I even live without this?
Im sharing how the Pulse feature in ChatGPT Pro proactively puts together a daily personalized digest for me - from Crashlytics crash fixes to Kotlin, Compose, and Jetpack updates. I explain why this is one of the most useful AI use cases for me.
AIDevelopment
I spent 400 hours working with AI agents and found the best one - here it is.
Detailed comparison of Codex and Claude Code after three months of using both tools. Breaking down the pros and cons of each, model features, harnesses, pricing, and revealing who I paid $200/month to
Development
I compared 17 Kotlin MVI libraries across 103 criteria - here are THE BEST 4
Comparison of MVIKotlin, FlowMVI, Orbit MVI, and Ballast based on research across 70 Kotlin architecture libraries and 100+ criteria, with examples, pros, cons, and use cases for each. Includes a public spreadsheet comparing 70 Kotlin MVI and state management libraries.
Development
I Found the #1 Cause of Freezes in Your app, and Heres the Proof
SharedPreferences in Android are leading to ANRs through a hidden mechanism that Google tried to lie to you about. I completely expose them with proofs.
Development
I achieved 0% ANR in my Android app. Spilling beans on how I did it - part 1
After a year of work, I reached 0% freezes (App Not Responding or ANRs) in my app. Sharing a complete guide with 12 tips: from removing SharedPreferences and enabling StrictMode to fighting memory leaks.
Development
How I built a game engine using MVI in Kotlin and avoided getting fired
I rebuilt a legacy game engine from scratch using MVI architecture and Kotlin, 7000+ -> 400 lines, 20s load time -> to 1.75s, crashes from 8% to 0.01%, and 1700% better event processing throughput.
Development
How to make Android notifications 100% reliable
A comprehensive guide to making Android notifications and alarms completely reliable, based on years of real-world experience building an alarm clock app with zero notification failure reports.
Personal
Why I switched to a split keyboard - and you should too
In August, I switched to the Piantor Pro split keyboard with 40 keys and the Colemak DH layout. It turns out that traditional QWERTY keyboards are relics of the past, while split keyboards are much more ergonomic, portable, and efficient.
Development
I Built a Wear OS App in One Evening. Full Guide and All the Google API Pitfalls
Built a Wear OS companion app in one evening, ran into terrible Java-based Google APIs and half-documented Horologist. Sharing my experience and step-by-step guide on how to avoid the main pitfalls when developing for watches.
Development
I Won't Make You a Reproducer
I wont make you a reproducer. Stop asking.
PsychologyPersonal
How to deal with toxic families - a practical guide to boundaries and accountability
A comprehensive guide on dealing with toxic family dynamics through structured conversations, exploring your emotions, and enforcing boundaries - including specific frameworks for creating accountability and knowing when its time to walk away.
PsychologyPersonal
How to work through emotions via journaling: my template after 4 years of Gestalt therapy
An 8-question template for an emotions journal, based on 4 years of experience in Gestalt therapy. Helps fully work through and resolve uncomfortable emotions through sequential entries.
Development
Events as State are an Antipattern in MVI and MVVM - here's why
Representing events as state creates more problems than using event streams like Channel, and I explain why popular solutions often backfire in real-world applications.
Development
How to load data in Kotlin with MVVM, MVI, Flow, Coroutines - COMPLETE Guide
Learn the correct way to load and observe data in Kotlin apps using, and avoid 4 common anti-patterns that cause hidden bugs, resource leaks, and production crashes.
Development
How to update state in MVI and MVVM with Coroutines: best state management approach.
Full guide on how to manage, update and represent state and avoid races in Kotlin MVI/MVVM apps using coroutines.
AI
Anthropic discovered signs of consciousness in LLMs. New research on AI introspection
Anthropic published research showing that large language models are capable of detecting manipulations of their thinking process and recognizing their own intentions, which may indicate elementary forms of self-awareness.
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