Skills
Full stack developer
I'm a full-stack developer with over 8+years of experience in building high-quality web and mobile applications for clients worldwide. I deliver clean, scalable and maintainable code. Good UX & project management skills. I focus of business needs first. I work with clients of any scale: from startups & small teams to enterprise. Great experience in Automotive | eCommerce | Retail | Fin-tech businesses I offer: • Web application development • Mobile application development • API development / Integrations / Automations • Frontend/backend development Tech stack: • Front: React / Vue / Svelte / Next.js / Nuxt.js / Redux / React Native / React Query / typescript • Back: Node.js / Express / Golang • CD: Docker / Kubernetes / Helm / Ansible / AWS / GCP • Databases: Postgres / Mongo / Cockroach.db / MySQL / Firebase • Message brokers: Kafka / NATS / RabbitMQ • APIs: gRPC / REST / graphql • Patterns: Hexagonal architecture / CQRS / Event sourcing & more Let's get in touch!
Reviews
Full Stack Developer - Paintbucket Nails Press On Launch (Homepage Update)
December 10, 2021 - December 26, 2021
Karl went above and beyond to complete an entire homepage redesign in a very short period of time. He was reliable and extremely responsive which I greatly appreciated.
Seeking a senior developer - React & Node.js
January 22, 2021 - February 2, 2021
Karl was easy to work with and understood my requirements. He was also adaptable very well to somewhat changing requirements along the way from my side. I couldn't be happier with the end result and his swift way of working. I am a happy customer and will continue to work with him in the future.
Typescript full stack development
February 20, 2021 - March 10, 2021
Working with Karl had been great! Absolutely fantastic service, great communication, did everything we needed and were very attentive to solve any fixes that occurred. Whenever we needed a change which was many times he would do so. Anything we didn’t like it needed amendment he would change straight away. Thanks Karl, you are amazing!!
Freelance developer to assist in house. Working in Node JS and PHP.
April 10, 2021 - April 27, 2021
Definitely going to go back to Karl with my future projects, highly recommend him! Very patient and understood clearly what I needed to get done. Thank you!
iOS app bug fixes & mainenance
May 15, 2021 - June 3, 2021
Great to work with this developer again. He always helps us in identifying problems we run into and is patient with finding a resolution that suits our needs. Highly recommended.
I need a developer to make a custom form on my site.
June 27, 2021 - July 13, 2021
Project completed successfully!
React Developer with knowledge of GraphQL
August 8, 2021 - August 30, 2021
Karl did an amazing job with us. He was able to work quickly completing his tasks ahead of time and under budget. He was an effective communicator with a talented sense for design. He improved our React code and made the UI look even better than the Figma designs we made. Thanks
MEAN stack developer for backend rework
September 19, 2021 - October 8, 2021
Karl was efficient, communicative and knowledgeable. I couldn't have wished for more.
C#, Unity developer with OpenXR headset
November 28, 2021 - December 17, 2021
Fantastic experience! Karl is a professional with very up-to-date knowledge of the latest tech that readily met our requests for change and did everything I asked for. You made things so simple, my new application is so much faster and bringing us next stage. I would highly recommend him to anybody serious about getting things done.
Software developer
January 5, 2022 - January 28, 2022
Karl completed the work in an expedient manner. He doesn't waste time, was easy to reach, and communicate with. We anticipate working with him again shortly.
NFT Website Creation (Javascript / React dev required)
February 17, 2022 - March 6, 2022
Excellent experience. Karl created a professional looking website with minimal instructions, and made all adjustments as requested in a timely manner. Will look to hire again.
Node developer needed
April 1, 2022 - April 18, 2022
Excellent work! Solid front end development skills. Highly recommended!
Web Developer (HTML5) (CSS3)
May 11, 2022 - May 26, 2022
We are 100% satisfied with the execution of the contract and we will highly recommend Karl to the Upwork community.
EMR .NET Application Development
June 21, 2022 - July 9, 2022
It is a pleasure working with Karl. I give him the highest recommendation !!!
IOS and android app development
July 20, 2022 - August 12, 2022
Karl truly is one of the best mobile app development providers. Thanks once more dear Karl.
Vanilla JavaScript and Java Website Upgrades
September 11, 2022 - September 27, 2022
Karl was a great help for us! He met deadlines and expectations. Great communication. Would hire again!
Expert Django Developer Needed ASAP
October 16, 2022 - November 3, 2022
It's a pleasure to work with this developer. Very competent. Very efficient. Great communication. We are looking forward to future collaboration.
Senior Python Developer
November 17, 2022 - December 10, 2022
Karl is fantastic. Very professional communication, super responsive, and great technical abilities. He's talented in many parts of the stack-- we've predominantly used him for python on a data heavy project. We're looking forward to working with him again.
Chrome extension for job seekers
December 14, 2022 - December 29, 2022
Great Job Karl. Thanks.
