Bring your idea, requirements or workflow.
I take care of the engineering.
I build web and mobile apps, and AI tools that process information and automate repetitive work.
A new product, or a better way to run an existing workflow.
I handle the app, the systems behind it and the infrastructure needed to run it.
Systems that process information, connect your tools and automate repetitive work.
We define data access, quality checks and human review before implementation. I use AI language models where the task and cost justify them.
Products I'm building and a confidential engineering engagement.
I'm building a creator studio where you can design a virtual avatar and use the same character in photos and videos.
The studio brings character creation, scene generation and media organization into one workspace.
My work on a confidential trading platform covered app development, backend services, transaction processing and monitoring.
Kotlin Multiplatform client; Rust and Python/FastAPI services; gRPC, RabbitMQ, PostgreSQL and Redis. Docker, Prometheus and Grafana for operations. AI-assisted implementation with code review and tests.
Share your idea, requirements or a description of the work you want to improve. We agree what to deliver, what it depends on and how to check the result.
I handle architecture, code, integrations and tests. You follow progress and try working versions.
I test and release the agreed version, then hand over the code, documentation and access you need to run and maintain it.
MSAL is my independent engineering business in Warsaw. I work remotely and welcome projects from Europe and beyond.
I have 10+ years of experience building Android apps and 7+ years leading teams, across banking and consumer products. I also build cross-platform apps and server software, using Kotlin Multiplatform, Python and Rust.
If a project needs additional specialists, we agree their roles and I coordinate their contribution.
Send your idea, requirements or a description of the workflow you want to improve. I'll review it so we can discuss what to build and how to deliver it.
fun simplifyFirst() {
val services = listOf(
"gateway",
"orders",
"order-router",
"router-manager"
)
val requirements = 1
println("${services.size} services")
println("$requirements requirement")
println("One function should do.")
}
fun chooseTradeOffs() {
val options = mapOf(
"latency" to "low",
"cost" to "low",
"complexity" to "low"
)
println(options)
println("Pick two.")
println("Then measure the third.")
}
fun findTheCause() {
val symptoms = listOf(
"slow app",
"slow API",
"slow dashboard"
)
val cause = "one query"
println(symptoms)
println(cause)
println("Three rewrites cancelled.")
}
fun clearCache() {
val server = "new UI"
var cache = "old UI"
cache = server
println(cache)
// Client screenshot
val browser = "old UI"
println(browser)
println("Try incognito.")
}
fun timeZones() {
val hour = 1
val offsets = listOf(-8, 0, 3, 12)
offsets.forEach {
println(hour + it)
}
// Four local times.
// Two release dates.
TODO("define today")
}
fun nameTheOwner() {
val teams = listOf(
"frontend",
"backend",
"platform"
)
val incident = "between the teams"
println(teams)
println(incident)
println("Adding an owner for 'between'.")
}
fun firstRelease() {
val mustHave = listOf(
"login",
"checkout"
)
val niceToHave = "new framework"
println(mustHave)
println(niceToHave)
println("Framework launch postponed.")
}
fun duckReview() {
val code = "broken"
println(code)
println("So this calls...")
println("Which then...")
println("Oh.")
println("OH.")
// Duck said nothing.
println("Promote the duck.")
}
fun regexFix() {
var problems = 1
val regex = ".*"
println("Use a regex!")
if (regex != "") {
problems++
}
println("$problems problems")
// Matches everything
// Except deadlines.
}
fun fridayDeploy() {
val day = "Friday"
val time = "17:59"
val change = "tiny"
println("$day $time")
println("A $change fix")
println("Deployed.")
println("Phone rings.")
println("Weekend?")
}
fun defineDone() {
val builds = true
val starts = true
val userCanFinish = false
println("Build: $builds")
println("Starts: $starts")
check(userCanFinish) {
"Not done yet."
}
}
fun qaVisit() {
val door = "works"
check(door == "works")
println("Door tested.")
println("Ready to ship.")
val qa = "the window"
println("QA enters via:")
println(qa)
error("Window error")
}
fun measureFirst() {
val before = 120
val after = 119
println("Before: $before ms")
println("After: $after ms")
println("New architecture.")
println("Same database query.")
}
fun temporaryFix() {
val born = 2012
val temporary = true
val year = 2026
val age = year - born
check(temporary)
println("$age years old")
// Nobody knows why.
// All are afraid.
println("Do not touch.")
}
fun hardProblems() {
val hard = listOf(
"cache invalidation",
"naming things"
)
println("Two hard things:")
for (i in 0..hard.size) {
println(hard[i])
}
// And off-by-one.
}
fun scaleTheSystem() {
val users = 3
val services = 18
println("$users users")
println("$services services")
println("${services / users} services per user")
println("Very personal service.")
}
fun setBoundaries() {
val access = mapOf(
"reader" to "read",
"editor" to "write"
)
val request = "make everyone admin"
println(access)
println(request)
println("That is not a role.")
}
fun pushTest() {
val users = "everyone"
val message = "test"
println("Send to myself.")
println("To: $users")
println(message)
println("Sent: 1,000,000")
// CEO replies:
println("test received")
}
fun addObservability() {
val status = "green"
val complaints = 12
println("Dashboard: $status")
println("Support tickets: $complaints")
println("Found the missing metric.")
}
fun findTheBottleneck() {
val app = 15
val network = 25
val waiting = 900
println("App: $app ms")
println("Network: $network ms")
println("Waiting: $waiting ms")
println("UI rewrite cancelled.")
}
fun pickTheTool() {
val problem = "add two numbers"
val plan = listOf(
"agent",
"vector database",
"workflow"
)
println(problem)
println(plan)
println(2 + 2)
println("No subscription required.")
}
suspend fun leave() {
val cancelled = true
try {
check(!cancelled)
} catch (e: Exception) {
println("Ignore errors.")
}
println("Still working.")
// Even cancellation
// cannot stop me.
}
fun fileNames() {
val versions = listOf(
"final",
"final2",
"final_REAL",
"final_REAL_v7",
"final_USE_THIS"
)
println(versions.last())
// They open final2.
println("Looks the same.")
}
fun smallRequest() {
val button = "Export"
val work = arrayListOf(button)
work += "PDF editor"
work += "Offline sync"
work += "AI assistant"
println(work)
println("Same deadline?")
}
fun codeQuality() {
val todos = listOf(
"remove this hack",
"ask who wrote it",
"stop adding TODOs"
)
todos.forEach {
println("TODO: $it")
}
TODO("resolve TODOs")
}