Jan M.
Poznan, Poland
100%
Job Success
Ruby on Rails Expert | Software Consultant | Full-Stack Engineer
$60.00/hr
I am the go to guy resolving any tech problems in your company. Value is what I am focusing on. I am mostly experienced with Ruby on Rails and React so probably a full-stack engineer title sticks for me, but I am not only focusing on the programming work. My goal is to understand your business and its problems helping you operate more smoothly, worrying less about development. Delegate any challenge to me, I will find the solution to it allowing you to focus on your things.
Background:
As mentioned I am seasoned full-stack dev, mostly experienced with Ruby on Rails(also being it's open-source contributor) and React. But during over 6 years been working on vast majority of projects in many different programming languages and on different positions. I am not scared of building web scrapers, reporting tools or managing servers(DevOps). Being an all-rounder helps me understand the businesses on multiple levels and have a broad perspective which results in the happiness of my freelancing clients.
Project Highlights:
🔹 COVID-19 Vaccination Passport Platform: I architected a system from scratch for a major German city, efficiently managing over 500,000 records, ensuring security, and maintaining high scalability during peak demands.
🔹 Telehealth Platform for Physiotherapists: I spearheaded a redesign of search functionalities, achieving a tenfold improvement in performance and markedly enhancing the user experience.
🔹 Marketing Automation Platform: My implementation of AI-driven messaging and data enrichment strategies has saved hundreds of hours and notably increased conversion rates.
Client-Centric Approach:
🌟 Problem Solving: I dive deep into each project's unique challenges, ensuring solutions are tailor-made to address specific needs.
🌟 Value Delivery: Each solution is designed to maximize ROI, whether through enhanced efficiency, increased security, or scalable growth.
🌟 Technology Expertise: As an official Ruby on Rails contributor, I bring authoritative knowledge and innovative practices to every project.
Technical Skills:
🛠 Languages: Ruby, JavaScript, SQL, Elixir, Python, HTML/CSS
🛠 Frameworks/Tools: Ruby on Rails, React, Docker, GitHub Actions, RSpec
🛠 Databases: PostgreSQL, MariaDB, Redis, AirTable
Work history
Work history
Amazon Customized Orders Automation
Jun 25, 2021
-
Jan 30, 2025
5.00
"I've been working with Jan since 2021 on multiple projects, and he has consistently exceeded my expectations. His deep expertise, reliability, and commitment to delivering top-quality work make him an…
Private earnings
Hubspot API Expert Dev
Nov 29, 2021
-
Jan 30, 2024
5.00
"It was great working with Jan although I had requirements that kept changing and my original brief was a bit vague. Thank you."
Private earnings
Build a Rails service object to connect our meeting scheduling system to Microsoft teams / Graph API
May 26, 2022
-
May 22, 2023
5.00
"We first asked Jan to help with a relatively contained coding issue, but over the months he worked with us, he ended up assisting us on a far broader range…
Private earnings
"connectwise manage API" specialist.
Apr 1, 2020
-
Apr 28, 2023
4.70
"We worked with Jan for almost a couple years on a project. Lots of changes being made along the way. He brought lots of talent to the table, and not…
Private earnings
Looking for Airtable Automation/API expert
Jul 21, 2022
-
Apr 12, 2023
No feedback given
Private earnings
API Integration Developer
Nov 4, 2021
-
May 30, 2022
No feedback given
Private earnings
Maintenance and new feature building of Healthtech Ruby on Rails app
Sep 22, 2021
-
May 18, 2022
5.00
"Jan has worked with us now for a while on a number of different projects. He is a super hard working developer that gets almost anything you throw at home…
Private earnings
Update ruby and rails version to the latest
Nov 15, 2021
-
May 18, 2022
No feedback given
Private earnings
Looking for expert Developer/Integrations Expert (Integromat, Go High Level APIs)
Apr 16, 2021
-
Mar 31, 2022
No feedback given
Private earnings
Backend Code Review
Jan 18, 2022
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Mar 24, 2022
5.00
"Jan was as professional and meticulous as he's always been in our prior interactions with him. We asked him to do a code review of our Ruby on Rails codebase…
Private earnings
Debug Ruby to Heroku Deployment
Dec 20, 2022
-
Present
Job in progress
Private earnings
Ruby on Rails PT Developer
Jan 27, 2021
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Present
Job in progress
Private earnings
dev project
5.00
of 1 reviews
May 27, 2020
-
Present
Mar 23, 2021
5.00
"Jan Matuszewski is a great all-round developer that's there when you need him. Just give him something to do and he does what's being asked, not more, not less, without… Job in progress
Private earnings
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Skills
Skills
- RESTful API
- JSON API
- API Integration
- Ruby on Rails Stack
- IT Consultation
- Airtable
- RubyMotion
Project catalog
Get started working with Jan quickly with these predefined projects.
Get started working with Jan quickly with these predefined projects.
You will get a performance boost of your Ruby on Rails application
From $75
3 days delivery
You will get a detailed Ruby on Rails codebase review from seasoned engineer
From $75
7 days delivery
You will get Airtable extensions/automations written by expert
From $150
1 day delivery
You will get a custom zapier integrations for any API
From $1,000
14 days delivery