Підготуй мене до співбесіди в цю компанію

Зараз ми шукаємо Middle FullStack Engineer для роботи над американською SaaS-платформою у сфері HCM (Human Capital Management). Це нішевий продукт, який автоматизує складні процеси розрахунку зарплат та обліку часу для регульованих індустрій (Healthcare, Legal).

🔋 Графік передбачає стабільний щоденний оверлап для зідзвонів та оперативних відповідей у чаті щонайменше до 14:00 EST (~21:00 за Києвом). За потреби (для важливих мітингів чи релізів) оверлап до 16:00 EST (~23:00 за Києвом).

Про проєкт:

👉 Екосистема з високими вимогами до точності даних та комплаєнсу. 👉 Команда з 12-13 людей, що працює над розвитком нових лінійок продуктів (Greenfield). 👉 Техстек: C# (.NET 8), Angular (17+), SQL Server, Azure (AKS).

Коротко про очікування:

✅ 5+ років досвіду з .NET та Angular. ✅ Розуміння архітектури складних SaaS-систем (ми цінуємо досвід з DDD та Clean Architecture). ✅ Англійська — Upper-Intermediate+.

This is an incredibly exciting role! Building a high-precision, compliant HCM SaaS platform using a modern tech stack like .NET 8, Angular 17, and Azure is going to be both challenging and highly rewarding. Before we map out our study plan, let's make sure we align it perfectly with your background.

To get started, tell me a bit about your hands-on experience: which versions of .NET and Angular are you most comfortable with, and have you worked with (DDD) or before?

I have strong .NET and Angular experience, and I've used Clean Architecture.

It's fantastic that you already have hands-on experience with Clean Architecture—that is going to be a major selling point during your interviews for this HCM product! Because this role is for a high-precision, highly regulated platform in the US market, the interviewers won't just ask you how to write code. They will want to know how you design systems that are secure, scalable, and completely compliant with laws like or .

To make sure we hit every critical requirement for this specific role, let's look at the personalized preparation path we've mapped out for you. This will take you step-by-step from core technical concepts all the way to a realistic simulated interview.

Your path

Технічна підготовка: Angular 17+

Архітектура та SaaS

Симуляція співбесіди та зворотний зв'язок

Before we dive straight into our technical review of .NET 8 and SQL, we need to make sure we're fully aligned on the non-functional requirements of this platform. This HCM platform runs on Azure AKS and deals with complex calculations (like healthcare shift premiums and legal overtime). Are you ready to dive deep into how we architect these systems for compliance, high accuracy, and cloud scale, or would you prefer to jump straight to our C# and SQL technical review first?

Let's start with C# and .NET 8 core technical questions

Let's dive straight into the core of ASP.NET Core and C#, focusing on the exact concepts that SaaS interviewers love to test. Since you are building a high-precision platform, they will want to know how you manage resources, configure security, and keep your code incredibly clean.

ASP.NET Core Middleware and Dependency Injection

In a secure HCM platform, every request must be intercepted to check compliance, validate tenant headers, and handle errors globally. This is where the comes into play. It is a series of software components assembled into an application pipeline to handle requests and responses.

Alongside the middleware, you must master Dependency Injection (DI). When registering services in ASP.NET Core, you have to choose their lifetime carefully. Registering a stateful service with the wrong lifetime can lead to concurrency bugs or massive memory leaks in production. Let's look at how these lifetimes behave under the hood:

Service Lifetime	How It Behaves	Best Real-World SaaS Use Case
Transient	Created every single time they are requested from the container.	Lightweight, stateless services like a `TaxCalculationUtility`.
Scoped	Created once per client request (logical connection).	Database context instances (`DbContext`) and user identity managers.
Singleton	Created the first time they are requested and live forever.	In-memory caches, configuration helpers, or thread-safe TCP clients.

A classic trap interviewers set is asking what happens if you inject a Scoped service (like your TenantDbContext) directly into a Singleton service. Because the Singleton lives forever, it will hold onto that Scoped instance forever, resulting in a that can cause memory leaks and database connection crashes.

Ти можешь це озіучити в голос?

I can absolutely read this out loud! I've gone ahead and initiated an audio podcast that walks through our breakdown of ASP.NET Core Middleware and Dependency Injection.

POD

Podcast:The Invisible Threat: How DI Lifetimes and Middleware Can Silently Break Your SaaS

Take a listen to the episode to hear these core container principles discussed in depth. Let me know when you are finished, and we will move right along to C# Generics, Polymorphism, and the Task Parallel Library (TPL)!