Denys Z.

Over 15 years of practical experience in the development and architecture of enterprise systems for web, mobile and desktop.
As a senior backend software developer created a lot of reliable, bug-free, well-documented RESTful APIs, heavy background jobs, web services, etc.
Guru in JAVA, strong experience in .NET, ASP.NET, and experience in web development.

In the past 10 years, I designed, architectured, and delivered a lot of heavy-loaded, reliable systems and services.
The main domains where I was involved are:
Accounting(Double-entry bookkeeping, reconciliations, chargebacks)
Billing(Clients invoicing)
Payments(Integration with various PSPs: PayPal, Payoneer, Transfast, WellFargo, Skrill, Adyen(visa, mc, amex), etc. )
Compliance(Users identity and data verification)
Authorization and authentication(oAuth2)

Me and my team successfully finished legacy migrations\modernization projects, such as:
Migrated desktop app to Web
Migrated\modrinzed from legacy Perl monolit to java microservice architecture:
user-payments related logic
Accounting related logic
Invoicing related logic
Compliance related log
Migrated to newer vendors APIs, file-based - SOAP - REST
I understand how the blockchain cryptocurrencies work and have an experience to process payments from BTC, ETH, LTC, Tether, XMR
I'm familiar with AWS infrastructure and can set up enterprise-level systems on it.

I take full responsibility for the architecture and quality of the logic that is delivered by me and my team.

In the future, I see myself as a product architect and an engineering lead in a successful product company.