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Nikolay Lesko

@nikolaylesko

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Senior Frontend Engineer at Zoral, improving a credit platform and building React, Angular, and Next.js applications.

Poland

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At Zoral, I build and maintain features for the company’s React-based credit platform and develop client-specific applications in modern Angular. I also built an interop layer that lets legacy modules work alongside new React code.

I improved a flow-chart visualization library by profiling and removing rendering and layout bottlenecks, keeping large diagrams smooth and interactive. I also helped put a reusable form and validation kit in place and now extend it.

Alongside frontend work at Zoral, I contribute features and fixes to a Node.js application for loan pricing and risk decisions. I also develop loan-processing features in Next.js, including a visual drag-and-drop editor for composing pages and forms.

Previously, at DOOR3, I designed the core structure for a greenfield Angular product and developed a data grid that supported its custom query language. Earlier, I built Node.js services and delivered applications across .NET, banking, and enterprise systems.

Experience

Work history, roles, and key accomplishments

Current

Senior Frontend Engineer

Current

Zoral

Sep 2020 - Present (6 years 1 month)

Build and maintain React features for a credit platform, develop client-specific Angular applications, and contribute to Node.js and Next.js backends. Improved flow-chart visualization performance and migrated build system to Webpack.

React React Query MobX Apollo GraphQL TypeScript Formik Yup styled components Kendo React Storybook Jest React Testing Library Angular RxJS RaphaelJS Webpack NodeJS Express Next.js REST Docker Docker Compose

Senior Frontend Engineer

DOOR3

Apr 2016 - Sep 2020 (4 years 5 months)

Designed core application structure for a greenfield Angular product, built an in-memory execution engine for a custom query language, and delivered a data grid component. Contributed to a NestJS admin dashboard and settings service.

Angular 2+TypeScript NgRX NGXS Angular Material Karma Protractor SASS Bootstrap Webpack Gulp NestJS TypeORM Class Validator Docker

Senior Frontend Developer

Trinetix

Jul 2015 - Mar 2016 (8 months)

Developed and refactored features for an internal application suite, built a Node.js backend-for-frontend aggregating reporting data, and implemented REST endpoints with Express and Passport authentication.

AngularJS JavaScript Karma Jasmine Protractor HTML CSS Bootstrap Gulp NodeJS Express Passports Lodash Winston PM2

Senior JavaScript / AngularJS Developer

GlobalLogic Ukraine

Nov 2014 - Jun 2015 (7 months)

Developed the frontend of a web application from requirements gathering through delivery, and set up automated testing with Karma and Protractor.

JavaScript AngularJS NodeJS NPM Grunt Karma Protractor SASS Bootstrap

Senior Full-Stack Developer (.NET)

Developex

Apr 2011 - Oct 2014 (3 years 6 months)

Delivered web applications end to end on ASP.NET MVC, implemented data layers with Entity Framework and NHibernate, and built social-platform applications integrating Facebook and Google APIs.

C#ASP.NET MVC Entity Framework NHibernate MSSQL WCF WPF Silverlight MVVM Prism XAML JavaScript jQuery KnockoutJS AngularJS Bootstrap

Senior .NET Developer

SteelEmotion

Apr 2010 - Mar 2011 (11 months)

Implemented order-management and register-management modules of an enterprise ASP.NET application, built security and permission-checking layer, and developed a dynamic form-loading engine.

C#ASP.NET 4.0 NHibernate SQL Server 2008 WCF DevExpress Stimulsoft Reports

Senior .NET Developer

Lime Systems

Dec 2008 - Mar 2010 (1 year 3 months)

Developed server and client sides of web applications for banking clients, handled database work including stored procedures and triggers, and integrated systems over SOAP web services.