Here's a list of Enterprise level solutions & complex software products below, I create during over 20 years of working in a field of IT.
Some of software is still under NDA, so there's not much details I can be provided for them.
Solutions for telecommunication service national-wide providers
Operations support systems (OSS) (or operational support systems in British usage) are computer systems used by telecommunications service providers to manage their networks (e.g., telephone networks). They support management functions such as network inventory, service provisioning, network configuration and fault management.
Together with business support systems (BSS), they are used to support various end-to-end telecommunication services. BSS and OSS have their own data and service responsibilities. The two systems together are often abbreviated OSS/BSS, BSS/OSS or simply B/OSS.
CRM, ERP solutions
Several national-wide Companies using My solutions.
Customer-relationship management (CRM) is an approach to manage a company's interaction with current and potential customers. It uses data analysis about customers' history with a company to improve business relationships with customers, specifically focusing on customer retention and ultimately driving sales growth.
Enterprise resource planning (ERP) is the integrated management of core business processes, often in real-time and mediated by software and technology. ERP is usually referred to as a category of business-management software — typically a suite of integrated applications—that an organization can use to collect, store, manage, and interpret data from these many business activities.
Full stack Front End, Back End development
Everything You want from landing page till portal
"Turn-key" basis - Give Your idea and get full working web-resource back on Your screen - forget about providers, domains, hosting ... and other stuff
Road management & monitoring systems solutions
You can find below screen-shots of one of realized systems (click on screenshots to view full screen)
*(content information, presented on screenshots, is for demonstration purposes only and not real)

System is fully corresponds to following Ukrainian national standards:
СОУ 42.1-37641918-063:2016 "Геоінформаційна система автомобільних доріг. Вимоги до складу, змісту та застосування"
СОУ 42.1-37641918-038:2016 «Паспорт автомобільної дороги»
СОУ 42.1-37641918-122:2014 "Автомобільні дороги. Вимоги до комплексу робіт з інформаційного забезпечення"
GiS & Mapping solutions
Basic platforms for customized GiS & Mapping solutions for Customers are ESRI and Autodesk software platforms as most responsible to enterprise sector requirements.​​​​​​​
DB Architect & Development (MS, Oracle, MySQL, Postgres, FireBird, DB2, MaxDB ...)
A database architect creates and manages large and expansive electronic databases to store and organize vast amounts of data. This is a highly skilled profession that is integral to most modern businesses. A database architect will help companies grow and expand into new marketplaces and help create a vision to meet strategic goals. A person in this position will work closely with software designers, design analysts and others to create comprehensive databases that may be used by hundreds if not thousands of people.
What does a Database Architect do?
Database architects will begin by studying the needs of their employer. They will assess the current data infrastructure and have discussions with employees and users to figure out where changes in the database need to be made. The database architect will then prepare and map out how the electronic database should look and function. From there, often working with a team, they will oversee and partake in the creation of the database using the ETL Architecture Standards.
Using coding skills and data access, database architects will then write the code to create the database. Once the database is created they will work to troubleshoot any problems and locate and correct oversights. During the creation of the database, they will work closely with employees in the company to make sure that the database meets the company's expectations. The type of database created can be anything from a system that handles payroll to one that deals with inventory or customer satisfaction.
A strong database architecture is central to most modern business, and mistakes made within it can cost upwards of millions of dollars. It is for this reason that a database architect must be sure to have a strong attention to detail. They must also be able to understand the current and projected database needs of their employer and be able to create a platform that functions over multiple systems in multiple areas. The database architect must be able to write strong and useful code, as poorly performing code will have a large negative impact on the performance of their architecture. They are essential in creating and maintaining security for the database and are needed to create standards for all users to ensure that the system is safe from outside interlopers. The database will need to be able to collect information from several different platforms and be able to convert this data and make sure that it transfers to the database and remains uncorrupted.
Continuing maintenance, updates and upgrades are also an important aspect of a database architect’s ongoing career. They will have to be able to identify and fix problems in these areas as they arise and make sure that the hardware and software used by the database is in working order and that it keeps up with the ever changing flow of technological development. Database architects will also have to identify trends in the database users, and use this information to improve performance and recommend new ways to improve the existing database. They must also schedule times for upgrades and repairs that will have a minimal impact upon the company; this may require working nights or weekends to ensure that the database is up and running by the start of the business day.
I have strong skills and deep knowns in:

Remote sensing sector (+ embedded software development) (10 years and over 3600 flight hours):
Remote sensing works Projects management (full cycle)
Aerial photography & digital Aerial photography, including full data processing cycle
Geodesy
Photogrammetry
Cartography & Topography
LiDAR data collection & processing
Aerial Navigation
Meteorology
Metrology​​​​​​​
CAD (dipl. eng)
Including:
MCAD - Mechanical Computer-Aided Design
ECAD - Electronic Computer-Aided Design
CAAD - Computer-Aided Architectural Design
CALS - Continuous Acquisition and Lifecycle Support
Autodesk and Bentley software suites

Road construction and management sector (since 2009)