Kostiantyn Keilin

Frontend Engineer

Toronto, Ontario, Canada7 yrs 4 mos experience

Highly Stable

Key Highlights

15+ years in web development with a focus on frontend technologies.
Expert in performance optimization and clean architecture.
Passionate about enhancing UX/UI in fintech applications.

Stackforce AI infers this person is a Fintech Frontend Engineer with extensive experience in building scalable enterprise applications.

Contact

Skills

Core Skills

JavascriptReduxReactMuiAngularjsFront-end Development

Other Skills

SCSSStyledComponentsAG-GridAgileGitRedux sagaTailwind CSSRxJSAmazon Web Services (AWS)AWSTypeScriptThunkSagaREST APIsJSS

About

I'm a Frontend Engineer with 15+ years in web development and 8+ years deep in React/Angular, Redux/RxJS, and TypeScript. I enjoy building clean, scalable UIs that serve complex enterprise systems — especially in fintech and data-heavy apps. My core strengths: performance optimization, clean architecture, and collaboration in Agile teams. I'm passionate about UX/UI and always look for ways to simplify user journeys and boost frontend efficiency. Currently building solutions for RBC at First Derivative (EPAM Group), I'm open to new opportunities and challenges in modern front-end ecosystems.

Experience

7 yrs 4 mos

Total Experience

1 yr 2 mos

Average Tenure

Current Experience

Rbc capital markets

Senior UI/UX Developer/Engineer

Aug 2022 – Aug 2025 · 3 yrs · Toronto, ON · Hybrid

Cut primary dashboard load from ~2s to 32ms by redesigning data-fetching strategy: first 200 rows in 20ms (2nd frame at 60Hz), with remaining
data streamed in the background without blocking user interaction.
Designed and maintained microfrontend architecture using Module Federation (PSA pattern); led React 16.8→18 migration of own module as part
of company-wide version alignment across teams.
Architected a config-driven form system with dynamic field validation, conditional disabling, and multi-stage workflow logic managed via external
config — eliminating scattered conditionals and enabling precise per-field debugging across a highly complex interface.
Built complex data-heavy interfaces using AG-Grid and MUI, supporting real-time financial data workflows.
Gained practical exposure to AWS services (S3, Lambda, EC2) within a government-sector deployment context.

ReactMUIReduxRedux sagaAG GridAngularJS+3

Epam systems

Senior Frontend Developer

Jul 2022 – Present · 3 yrs 10 mos · Toronto, Ontario, Canada · Remote

I initially started working at First Derivative, but during my time there the company merged with EPAM, so the name is now more relevant to my work history.
Development of fintech solutions for one of the top financial institutions in North America.
Creating and improvement of new interfaces for existing company platforms.
Advising colleagues and counterparties on the development of web applications and SPA.
Stack/Tools: JavaScript, Redux, SCSS, MUI + StyledComponents, AG-Grid, Agile, Git.

JavaScriptReduxSCSSMUIStyledComponentsAG-Grid+2

Varteq, inc.

Frontend Developer

Oct 2020 – Jan 2022 · 1 yr 3 mos · Kyiv · Remote

Angular Development: Built complex Angular modules for medical data visualization dashboards, utilizing RxJS-based reactive pipelines and OnPush change detection for optimized rendering.
Collaborated with a large international team of 20+ developers based in the US and Europe.
Automated repetitive work by redesigning the code pipeline, increasing the speed of the key component development by 5X for the whole Front End team.
Lead communication with English-speaking customers to determine project requirements and meet the desired specifications.
Stack/Tools: Angular, React, TypeScript, Redux, RxJS, Thunk, Saga, MUI/Tailwind, REST API’s, Git.

AngularJSReactTypeScriptReduxRxJSThunk+4

Trinetix

Frontend Developer

Mar 2020 – Oct 2020 · 7 mos · Kyiv, Kyiv City, Ukraine · Hybrid

Built a new version of a paperwork logging system to improve extensibility and maintainability, which optimized the further project development for a team of 40+ Front End engineers.
Created unit tests for the whole codebase, reinforcing the system by reaching the required 90%+ coverage.
Stack/Tools: JavaScript/TypeScript, Redux, Thunk/Saga, MUI, JSS, SCSS.

JavaScriptReduxMUIJSSSCSS

Litslink

Front end (React JS) Developer

Nov 2018 – Mar 2020 · 1 yr 4 mos · Kyiv, Ukraine · On-site

Software Development Company
Built simple Node.js backend services and REST APIs for client projects, handling data persistence and server-side logic as a sole developer.
Technologies: React, Angular, Node.js, RxJS, Redux, Redux-Saga, Axios, Bootstrap, SCSS.
All projects under NDA. All projects are outsourced. Communication is in English only.

AngularJSReactNode.jsRxJSReduxRedux-Saga+3

Arnit

Front End Developer

Jul 2017 – Oct 2018 · 1 yr 3 mos · Kiev Region, Ukraine · On-site

The company develop and support its high-loaded projects in the field of education.
Support and modernization of company sites
Development of new sites, pages, mailings

AngularJSGitReduxjQueryEmail DesignKanban+1

Vivo active

Web Development Specialist

Sep 2016 – Aug 2017 · 11 mos · Киев · Hybrid

A manufacturing company that produces dairy starter cultures.

Front-End DevelopmentjQueryMobile Application DesignKanbanCSS

Self-employed

Self Employed Web Developer

Jul 2014 – Sep 2016 · 2 yrs 2 mos · Kyiv, Kyiv City, Ukraine

Worked in several projects as a contractor. In each of the campaigns, I performed work as a front-end developer with the technologies that were relevant at that time.

Front-End DevelopmentjQueryMobile Application DesignCSS