Cass Business School

Staff Engineer at Lantum

London, London, United Kingdom

Lantum is a powerful platform managing staffing in the healthcare industry. Lantum saves healthcare organisations in both NHS and the US millions annually by efficiently automating processes end to end connecting the right clinicians with the right shifts.

Lantum

Staff Engineer

Alpha FX Group plc

Lead Developer

Liberis

Head Of Engineering

- Splitting monolith into microservices (C#, .NET Core, ARM Template, Service Fabric, Docker, Octopus Deploy, TeamCity)Have worked with Engineering Managers and Senior Engineers to establish new set of services that would replace the existing monolithic API and SQL Database. Established the migration plan that was acceptable to the business with essential features being delivered while still delivering overall migration in a timely manner. Improved overall scalability of the existing system by about 50%, by optimising SQL queries and adding asynchronous caching to ensure that it can cope with a rapid growth in transactions.•	WhatsApp Business API (C#, Linux, Service Fabric, Docker)Have lead the team that has developed the first WhatsApp Business API integration for UK based company here. Ensured that the work could progress, even when the product requirements could not be fully defined. Have setup WhatsApp gateway API hosted on Docker containers on Linux VMs that would integrate with our C# backend on Windows VM Scale Sets. •	Improving process automation (C#, ARM Template, Service Fabric, Docker, Service Bus)As part of the effort to make the business more cost efficient, the team was primarily focused on rewriting some of the existing infrastructure as micro-services hosted on Azure Service Fabric. The main focus was centred on automated notifications in order to reduce the number of emails and calls to Customer Service. •	Leading and coordinating projectsDelivering these projects, required coordination between several departments as well as few separate development teams within engineering. Have been involved in gathering requirements from multiple stakeholders, as well as resolving the disagreements between departments whenever their separate business requirements came in direct conflict with each other.

WorldRemit

Engineering Manager

- WhatsApp Business API (C#, Linux, Service Fabric, Docker)Have lead the team that has developed the first WhatsApp Business API integration for UK based company here. Ensured that the work could progress, even when the product requirements could not be fully defined. Have setup WhatsApp gateway API hosted on Docker containers on Linux VMs that would integrate with our C# backend on Windows VM Scale Sets. •	Improving process automation (C#, ARM Template, Service Fabric, Docker)As part of the effort to make the business more cost efficient, the team was primarily focused on rewriting some of the existing infrastructure as micro-services hosted on Azure Service Fabric. The main focus was centred on automated notifications in order to reduce the number of emails and calls to Customer Service. •	Leading and coordinating projectsDelivering these projects, required coordination between several departments as well as few separate development teams within engineering. Have been involved in gathering requirements from multiple stake holders, as well as resolving the disagreements between departments whenever their separate business requirements came in direct conflict with each other.

Senior Integrations Engineer

- External Integrations (C#,  Web API, Azure Service Bus,  CosmosDB )Integrating with the third party logistic company to ensure high throughput transaction processing, and high availability solution.•	Solution architecture (C#,  Azure)Have conducted a critical assessment of the proposed architecture and suggested changes that we adopted. This has ensured that the project was delivered on time, even though there were new business requirements added during the development process.

Amido

Consultant

- External Integrations (C#, WCF, Web API, Azure Cloud Services, SQL)Migrating existing third party integration from Windows Service to the Azure Cloud Service. Fixing multiple issues with existing integration and drastically improving the efficiency of the Cloud Service.•	Public and Private WebApi (C#, ASP Core, NUnit, xUnit, SQL, TeamCity, Octopus)Improving the efficiency of existing WebApis as well as developing new functionality. Increased test coverage and setting up the first ASP Core project in the company on TeamCity and Octopus. Further improved testability by using Autofac DI for all class instantiation. •	Website development (C#, JavaScript, AngularJS, DocumentDb, WebApps, Security) Added role based user management and rewritten authentication system to use OAuth 2.0 while providing custom implementation for data store. Have significantly improved the security of the system by implementing triple layered secure communication, including Mutual SSL.

Senior Engineer - Global Integrations

- External Integrations (C#, WCF, Web API, SQL)Participated in design and implementation of new system integrations with APIs of external partners. As well as improvements in existing integrations.•	Payment System Improvements and Fraud prevention automation (C#, SQL)Adjusted existing payment provider integration to improve security and enforce payment information checks. Reduced cases of false positives for fraud prevention and implemented automated fraud prevention system.•	Website development (C#, JavaScript, AngularJS) Finalising website design and ensuring that the product reaches the market within a reasonable time.•	Reduced SQL server resource requirements by a factor of 10 while maintaining the same level of service. •	Product design and development •	Android App development and testing

Kabbee

- Monitor App (Internal Tool) UI (C#, WPF, XAML, Web AP, SQL)Written an internal tool for managing Bookings, users and monitoring potential problems using WPF. This was done primarily to speed up migration from the legacy system as well as providing an improved interactive UI for internal staff.•	Authentication system rewrite(C#, ASP Authentication, Web API, SQL)Rewritten and simplified Authentication system to improve integration with the legacy system as well as simplify any future changes/updates.•	Bug fixes and code maintenance (C#, SQL, Web API)

Contractor

- Small team management (CI, Small Team Management)Was managing a small team of server side developers of various ages and levels of experience. Certain standards were enforced programmatically, by setting the Unit test coverage limit on the new CI system. Trained a junior developer to the mid-level developer by constantly discussing his approach to problem solving and potential alternatives of achieving same effect with fewer lines of code. Conducted developer formal appraisals as well as participated in disciplinary hearing. Have monitored developer productivity by periodic code reviews. Motivating team members by allocating tasks to them that they find more “fun” and enjoyable, while taking over more mundane tasks like Invoicing for myself.•	Continuous Integration (C#, Web API, Unit test, Cruise Control)Have written a Continuous Integration system for the company based on Cruise Control framework. This involved a lot of scripting to ensure that all auto tests are checked prior to allowing any given service to be deployed to the test environment.•	Realtime Service (C#, SignalR, SQL)Have written a web service that would send real-time updates through persistent connection to client Apps as well as web UI for internal fleet interface. Had to struggle with the technology for a while, but the resulting improvements in efficiency and user experience were more than worth it.•	Unit test and Integration tests comprehensive coverage(C#, Unit test, SQL, CI)Have covered most of the newly written Web API services with Unit tests that covered most of the internal business logic as well as service level Integration tests that would test service endpoints end-to-end prior to release to the live environment.	•	Fleet invoicing system rewrite and automation (C#, Web API, SQL)Rewritten fleet invoicing system to ensure it does not require any developer involvement or time as well as minimal time from Operational department.

Head of Services

- Address Search rewrite(C#, Web API, SQL)Have created new database structure that was better suited for faster address searches as well as improved address interpretation logic that could split user input into address components for smarter address search logic.•	Quoting Service(C#, Web API, SQL)Have rewritten company’s entire quoting logic as a standalone Web API service that was then integrated into existing system. Have then extended existing logic with new ideas from business as well better ETAs based on the GPS data from individual vehicles.

Senior Software Developer

Projects● FxPro Quant (Visual Builder of trading strategies)(C#, MQL4, AS3, Flash)Lead the project to develop flagship product for the company. Had to design, specify andoversee the implementation of key features. Gathered feedback from clients and determinewhat changes need to be implemented on regular basis. Was responsible for the final approvalof each version release, before it could be allowed and become publicly available.● FxPro EA Library (MQL4)Developed multiple trading algorithms to bolster the range of algorithms that were offered tothe clients. Sorted through extensive list of existing trading algorithms, while judging which onescould be allowed into the library as well as correcting any issues that they had prior to beingmade publicly available. Developed protection mechanism that ensured that company tradingalgorithms could not be traded on the platforms of other brokers, thus maximising their benefitand preventing competitors from gaining any benefit from it.● FxPro Supertrader(C#, C++, MQL4)Developed utility algorithms that automated backtesting multiple trading algorithm, allowed tobacktest a strategy while avoiding news without requiring to alter the code of the strategyitself. Developed the system that oversees trading algorithms ensuring that they are disabledduring major news releases and then automatically activated after the volatility risk has passed.● Trading Algorithm Development (C#, C++, MQL4, HTTP, JSON, SQL)Developed trading strategies based client and team member specifications. More complexalgorithms involved integration of multiple API services that were read by the strategy. Bothprofitability and general algorithm performance were equally important in this case, sincestrategy had to be tested over historical data.

FxPro Group

Software Developer

Projects•	GATE API Service (Java, HTTP, GATE)Packaged the Java API of the natural language processing package GATE into a Java based http service, which was required for the eventual automation of GATE based processes. The service interface was deliberately simplified so that the setting of the GATE code were configurable by the user who had no understanding of Java but good understanding of manual GATE setup.•	Data gathering projects (HTTP, HTML, Python, NodeJs, XML, MongoDb)Developed dozens of webcrawlers to gather relevant data from multiple sources and aggregate it within databases for further processing.  Used XML data dumps of large datasets, parsed the data within python script to filter out irrelevant information and to store the relevant data within MongoDb for further use by other scripts.•	Process Scheduler (Python, MongoDb)The service that executes scripts based on their scheduling setup and then records their completion status. This allowed console apps from multiple programming languages to be executed sequentially or in parallel, while ensuring that if a script execution is processed in accordance the specified dependency tree.•	Service/API development(HTTP, Python, NodeJs, JSON, XML, Google API, Facebook API)Multiple services were required for use of the development team to ensure the level of abstraction above different data gathering and storage methods. Used both Python and NodeJs to develop service wrappers around APIs of external services to hide their complexity. Used Google API that returns data in XML, parsed the info to extract relevant data and then repackaged it in JSON format that was then could be used by other programs made by the rest of development team. Had to develop a callback server which was required by facebook to use their event based APIs.

Mobius Innovations

Software developer

Developed multiple trading strategies in Metatrader 4 for several private clients of the Forex retail trading sector. The process involved periodic redesign of the expected product based on the constantly changing requirements of the users. As iterations of the product were produced the clients would test them and then changed the design specification based on the results they got from testing the products against the historical and live market data.

Freelancer.com

Freelance Trading Tools Developer for retail clients, London

Projects•	Trading Algorithm projects (MQL4, MQL5, Java)Developed multiple trading strategies in Metatrader 4(MQL4), Metatrader 5(MQL5) and Dukascopy(Java) to client specifications, as well as optimizing strategies based on historical performance.Resulting systems were based on continues communication with the clients to ensure that the resulting algorithm is replicating the actions of the client as closely as possible.•	C++ Trade Copier(C++, Multithreading, Sockets, MQL4)Socket based multi-threaded server based solution for Metatrader 4 trade copier. Each client is allocated a separate thread to handle its requests.  To complete solution had to re/invent:•	Concurrent Collection — to replace TBB concurrent list and eliminate dll dependence. •	Unity Synchronisation — to ensure that if a single server crashes, it is immediately replaced by one of the servers in the cloud.•	IES Encryption Algorithm — to prevent packet sniffing software from reading server messages.     •	Cloud File Indexer (.Net 4, C#)Developed distributed processing framework that is centrally controlled for the user convenience and allowed for massively parallel (up to 5000 threads globally) file server requests across multiple servers in all major financial centres. Peak throughput was 1.1mil objects/hour.•	WinForm Trade Copier(WinForm, .Net 4.5, C#, Async CTP, Rx, Sockets)Used as elements of .Net 4.5 to developed trade copying server that handles concurrent client request without resorting to multi-threading. Used Rx (Reactive extensions) for event based and responsive user interface as well as Async CTP for handling multiple concurrent socket reads and writes asynchronously from a single thread.

Oleg Kovalichin

Oleg Kovalichin