Pulseboard Analytics
A real-time SaaS analytics dashboard for e-commerce teams. Live charts over WebSockets, role-based access and exportable reports — cut report preparation time by 70%.
Portfolio · 2026
Jonathan Soares Siqueira
Web Developer
I design and build fast, accessible and maintainable web applications — from pixel-precise interfaces to the APIs that power them. Based in Chojnice, Poland, working with teams across Europe and beyond.
Years experience
0
Projects shipped
0
Avg. Lighthouse
0
Happy clients
0
About
Bio
Building the web, one clean commit at a time.
I'm a full-stack web developer with seven years of experience turning ideas into reliable products. My sweet spot is the front end — React, TypeScript and modern CSS — backed by solid Node.js and PostgreSQL skills that let me own features end to end.
I've worked with startups, agencies and established e-commerce brands, shipping everything from marketing sites to complex SaaS dashboards. I care about performance budgets, accessible markup, and codebases that the next developer will actually enjoy working in.
Performance firstCore Web Vitals in the green
Accessible by defaultWCAG 2.2 AA compliant UI
Clean architectureTyped, tested, documented
const developer = {
name: "Jonathan Soares Siqueira",
role: "Web Developer",
location: "Chojnice, PL",
experience: 7,
stack: ["React", "Next.js", "Node"],
coffee: Infinity,
openToWork: true
};
// let's build something great
developer.connect("you");
name: "Jonathan Soares Siqueira",
role: "Web Developer",
location: "Chojnice, PL",
experience: 7,
stack: ["React", "Next.js", "Node"],
coffee: Infinity,
openToWork: true
};
// let's build something great
developer.connect("you");
02 Skills & Stack
Core proficiency
Self-assessed
HTML / CSS / Responsive design96%
JavaScript & TypeScript93%
React & Next.js91%
Node.js & REST / GraphQL APIs84%
Databases (PostgreSQL, MongoDB)78%
DevOps & CI/CD72%
Toolbox
Daily drivers
Front end
Back end
Tooling & Cloud
Quality & Design
03 Selected Projects
Northwind Outfitters Store
Headless e-commerce storefront with server-side rendering, instant search and a streamlined checkout. Lifted mobile conversion by 23% and reached a 99 Lighthouse performance score.
MedSlot Booking API
Appointment scheduling platform for a network of private clinics: a NestJS API with calendar sync, SMS reminders and a lightweight admin panel. Handles 15k+ bookings per month.
04 Experience
Work history
2019 — Present
Senior Web Developer
2023 — PresentBrightlane Digital · Remote
- Lead a team of four developers building SaaS dashboards and client portals in Next.js and TypeScript.
- Introduced a shared component library with Storybook, cutting UI development time by roughly 35%.
- Set up automated testing and CI/CD pipelines, reducing production incidents significantly.
Full-Stack Developer
2021 — 2023Vistula Commerce Labs · Gdańsk
- Built headless storefronts and Node.js integrations for mid-sized retail brands.
- Optimised Core Web Vitals across 12 client sites, improving average LCP by 1.8 seconds.
Front-End Developer
2019 — 2021Pixelforge Studio · Bydgoszcz
- Developed responsive marketing websites and landing pages from Figma designs.
- Implemented accessible, reusable UI components and animation systems.
Education
B.Sc. Computer Science
2015 — 2019
Certifications
AWS Certified Developer – Associate · Meta Front-End Developer
Languages
Portuguese
English
Polish
05 Contact
Let's talk
Have a project in mind? Let's build it.
Whether you need a new web application, a performance overhaul or an extra pair of hands on your team, I'd be glad to hear from you. I usually reply within one business day.
Name
Jonathan Soares Siqueira
Phone
+1 971 335 1496
Email
georgepritchard465@gmail.com
Address
Sloneczne Wzgorze 589600 Chojnice
Poland