Senior Frontend Engineer
CurrentBuilding the B2B platform that helps digitizing the ordering system for F&B, as well Horeca services.Tech Stack: TypeScript, React and GraphQL
Nov 2022 - Present
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Umar Sesay Email & Phone Number
Senior Frontend Engineer
at
kollex
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✓ Verified Jun 2026
3 data sources
Profile completeness 86%
Current company
Role
Senior Frontend Engineer
Location
Berlin, Berlin, Germany
Company size
Who is Umar Sesay? Overview
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Quick answer
Umar Sesay is listed as Senior Frontend Engineer at kollex, a company with 33 employees, based in Berlin, Berlin, Germany. AeroLeads shows a matched LinkedIn profile for Umar Sesay.
Umar Sesay previously worked as Frontend Engineer at Kaufland and UI Engineer at Mcmakler. Umar Sesay holds Bsc Management Information Systems, Computer And Information Sciences And Support Services from University Of Wollongong.
Company email context
Email format at kollex
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kollex
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Profile bio
About Umar Sesay
As a seasoned UI Engineer / Frontend Engineer, I am passionate about crafting exceptional web experiences, with a strong foundation in HTML, CSS, JS, TypeScript, React etc, I specialise in building dynamic and interactive web applications. My expertise also extends to A/B Testing, Monitoring using tools like Optimizely, DataDog, MixPanel, Design Systems etc, enabling data-driven decision-making for superior user experiences.Been the forefront of Kollex's B2B platform development, my focus is on digitizing the F&B and Horeca service ordering systems. My toolkit, rich with HTML, CSS, TypeScript, JS, React, and GraphQL, enables me to create impactful digital solutions that streamline operations and elevate user experiences.With a proven track record at Kaufland, I honed my skills in user interface engineering, optimizing web performance, and implementing A/B testing to refine user engagement. My commitment to efficiency and robust testing ensures that the digital platforms we develop stand as benchmarks for excellence and innovation.Skills: Responsive Web Design, React, Vue, Cypress (End to End Testing), Jest (Unit Testing), JavaScript, TypeScript, GraphQL, Rest, DataDog, AWS, Gitlab, GIT, HTML Emails, A/B Testing (Optimizely | Mixpanel)
Current workplace
Umar Sesay's current company
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Kollex
7 roles
Umar Sesay work experience
A career timeline built from the work history available for this profile.
Frontend Engineer
- As a Frontend Engineer at Kaufland, I optimized images, code, and cross-browser compatible pages using HTML5, CSS3, Vue, and JavaScript to deliver engaging user experiences and enhance user engagement.
- Implemented AB Test with Optimizely to improve user experience.
- Supported designers in resolving website performance issues for efficient web development.
May 2021 - Sep 2022
Ui Engineer
Delivered responsive, cross browser compatible and accessibility complaint websites, achieving 19% faster load timeProduced stunning visual elements of web applicatiuons by translating UI/UX design wireframes into accessible re-usable code.Improved on the end-end test coverage of the portal test, to prevent and find bugs using CypressSkills: HTML5, CSS3.
May 2019 - Apr 2021
User Interface Engineer
Collaborated with web designers, back end developers and UX designers to design, build, test and improve web products.Added to the company database of code by developing reusable code that could minimize the time needed to complete projects in the future, example of this is working with Email templates, we used MJML for the templates which helped us.
May 2017 - May 2019
Html Lead {Front-End Developer}
HTML Lead:Notable Project was Abu Dhabi Chamber of Commerce Web ProjectDevelop web applications according to client briefs and modify designs to meet changes in client specificationsDevelop web products by coding wireframes into elements that users can interact with to create effective user experience.Integrated our HTML custom builts templates into a.NET.
May 2016 - May 2017
Founder @ Kurudjula
Kuru Djula
Kurudjula, is a classified web platform system for rough gem stone dealers to connect with each other, as well as buy or sell precious metals. Kurudjula vision is to digitize the trading of rough gems from Africa and beyond.
Jan 2015 - Apr 2016
Frontend Developer - Junior
Aperto - An Ibm Company
- In my role as a junior Frontend Developer at Aperto - An IBM Company, I collaborated with senior developers to design web applications, aligning designs with client requirements. I developed interactive prototypes and.
- Assisted in handling client feedback on work
- Gained skills in aligning designs with client requirements
Jun 2014 - Dec 2015
Team & coworkers
Colleagues at kollex
Other employees you can reach at kollex.de. View company contacts for 33 employees →
VV
Vanessa Vogel
Colleague at KollexBerlin, Berlin, Germany, Germany
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SW
Stephan Weiß
Colleague at KollexBerlin Metropolitan Area, Germany
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TZ
Timon Zuelsdorf
Colleague at KollexBerlin, Berlin, Germany, Germany
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JW
Jan Wehowsky
Colleague at KollexBerlin Metropolitan Area, Germany
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SF
Saskia Franke
Colleague at KollexBerlin, Berlin, Germany, Germany
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NG
Nikolai Gauser
Colleague at KollexBerlin, Berlin, Germany, Germany
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FA
Franziska Andersch
Colleague at KollexGermany, Germany
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SS
Sebastian Schreiber
Colleague at KollexDargun, Mecklenburg-West Pomerania, Germany, Germany
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EM
Erik Müller
Colleague at KollexBerlin, Berlin, Germany, Germany
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HC
Hasibe Camli
Colleague at KollexBerlin, Berlin, Germany, Germany
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Vanessa Vogel
Colleague at KollexBerlin, Berlin, Germany, Germany
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SW
Stephan Weiß
Colleague at KollexBerlin Metropolitan Area, Germany
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TZ
Timon Zuelsdorf
Colleague at KollexBerlin, Berlin, Germany, Germany
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JW
Jan Wehowsky
Colleague at KollexBerlin Metropolitan Area, Germany
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SF
Saskia Franke
Colleague at KollexBerlin, Berlin, Germany, Germany
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NG
Nikolai Gauser
Colleague at KollexBerlin, Berlin, Germany, Germany
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FA
Franziska Andersch
Colleague at KollexGermany, Germany
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SS
Sebastian Schreiber
Colleague at KollexDargun, Mecklenburg-West Pomerania, Germany, Germany
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EM
Erik Müller
Colleague at KollexBerlin, Berlin, Germany, Germany
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HC
Hasibe Camli
Colleague at KollexBerlin, Berlin, Germany, Germany
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2 education records
Umar Sesay education
Bsc Management Information Systems, Computer And Information Sciences And Support Services
Diploma, Web Development
Karrox Technologies
FAQ
Frequently asked questions about Umar Sesay
Quick answers generated from the profile data available on this page.
What company does Umar Sesay work for?
Umar Sesay works for kollex.
What is Umar Sesay's role at kollex?
Umar Sesay is listed as Senior Frontend Engineer at kollex.
Where is Umar Sesay based?
Umar Sesay is based in Berlin, Berlin, Germany while working with kollex.
What companies has Umar Sesay worked for?
Umar Sesay has worked for Kollex, Kaufland, Mcmakler, Gap, and Netaq E-Solutions.
Who are Umar Sesay's colleagues at kollex?
Umar Sesay's colleagues at kollex include Vanessa Vogel, Stephan Weiß, Timon Zuelsdorf, Jan Wehowsky, and Saskia Franke.
How can I contact Umar Sesay?
You can use AeroLeads to view verified contact signals for Umar Sesay at kollex, including work email, phone, and LinkedIn data when available.
What schools did Umar Sesay attend?
Umar Sesay holds Bsc Management Information Systems, Computer And Information Sciences And Support Services from University Of Wollongong.
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