Bjorn Krols

Freelance full-stack developer

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Hello there 👋

I am an experienced full-stack developer with a passion for delivering high-quality, scalable and secure solutions.

I am open to working with clients from various industries on both short-term and long-term projects.

These are some of the technologies and tools I have worked with in the past. I am always open to learning new technologies and frameworks.

Languages: JavaScript, TypeScript, Python, Go, Java, Lua, Bash
Frontend: React, React Native, Expo, Next.js, Vue, Nuxt, Electron, Apollo, Tailwind, HTML5, CSS
Backend: Node.js, Express, Koa, tRPC, NestJS, TypeGraphQL, TypeORM, Prisma, Apollo Server, GraphQL, REST
Databases: PostgreSQL, MySQL, Oracle, SQLite, DynamoDB, Redis, BigQuery
Infrastructure: AWS, Google Cloud Platform, Serverless, Terraform, Docker, Firebase, Fly, Render, PlanetScale
Data Science: Jupiter, Pandas, NumPy, Plotly, PyTorch.
Testing: Jest, Cypress
CI/CD: GitHub Actions, Gitlab CI, Jenkins, CircleCI

December 2023 - Now

Rush is a full-stack software studio.

Stack: TypeScript, Python, Next.js, React, React Native, Expo, Tailwind, tRPC, NestJS, Pandas, GitHub Actions.
Highlight: I managed several full-stack projects, encompassing infrastructure, backend, frontend, mobile development, and data science.

March 2023 - December 2023 · 10 Months

Lab Box is a start-up studio focusing on the future of mobility, backed by D’Ieteren.

Stack: TypeScript, Python, Next.js, React, React Native, Expo, Tailwind, tRPC, NestJS, Apollo, GraphQL, Pandas, GitHub Actions.
Highlight: I've led a handful of full-stack projects, launched multiple React Native apps on app stores from scratch, and implemented various data and business intelligence pipelines using Python and a range of data science tools.
Exit reason: The lab and its projects were merged into D’Ieteren.

August 2019 - March 2023 · 3 years 8 months

Shippr (https://shippr.io) is a logistics marketplace connecting companies and drivers.

Stack: TypeScript, React, React Native, Expo, Tailwind, Express, Apollo, GraphQL, PostgreSQL, Redis, AWS, Terraform, Docker, Jest, Cypress, Gitlab CI.
Highlight: I set up the e-payment infrastructure for the company from scratch, allowing automatic payments from customers and payouts to drivers.
Exit reason: I was looking for a new challenge as I transitioned into freelancing.

February 2018 - June 2019 · 1 year 5 months

A Belfius (Belgian bank) innovation lab.

Stack: JavaScript, Vue, Angular.js, Tailwind, Express, PostgreSQL, DynamoDB, AWS, Serverless, Cypress, CircleCI
Highlight: Led a small team to build a group payment and fundraising platform from scratch.
Exit reason: The lab was closed after multiple products failed to reach product-market fit.

June 2016 - January 2018 · 1 year 8 months

A Proximus (Belgian telecom company) subsidiary.

Stack: Java, JavaScript, JSF, React, Bootstrap, Spring, Oracle, Red Hat, JUnit, Jenkins
Highlight: Spearheaded the migration of legacy JSF interfaces to a more modern React-based architecture.
Exit reason: Desire to work with a more modern stack.

January 2014 - June 2016 · 2 years 6 months

OSBot provides RuneScape automation software.

In addition to client work, I enjoy exploring new technologies and working on personal projects.

Here are a few examples of side projects that I have worked on:

Feedbark (2022 - Present)
- https://feedbark.io
- A product feedback widget for small businesses.
- Stack: TypeScript, Next.js, Tailwind, Prisma, MySQL, Firebase, Fly, PlanetScale, GitHub Actions
HTTPHQ (2022 - Present)
- https://httphq.com
- A real-time tool for capturing and inspecting HTTP requests.
- Stack: Go, Fiber, GORM, Alpine.js, SQLite, Fly, Cypress, GitHub Actions
Technotrampoline (2021 - Present)
- https://technotrampoline.com
- My personal technology reference blog.
- Stack: TypeScript, Next.js, Tailwind, AWS, Terraform, GitHub Actions
Botpoison (2021 - Present)
- https://botpoison.com
- An invisible, user-friendly anti-spam solution.
- Stack: TypeScript, Next.js, Tailwind, Koa, TypeORM, PostgreSQL, AWS, Terraform, Jest, GitHub Actions
Lyticus (2019 - Present)
- https://lyticus.com
- Entry-level web analytics platform.
- Stack: TypeScript, Vue, Nuxt, Tailwind, Koa, TypeORM, PostgreSQL, AWS, Serverless, Jest, GitHub Actions
Handlescout (2018 - 2023)
- https://handlescout.com
- A tool that monitors availability of social media handles.
- Stack: TypeScript, Vue, Nuxt, Tailwind, Koa, TypeORM, PostgreSQL, AWS, Terraform, Jest, GitHub Actions
Formspark (2018 - Present)
- https://formspark.io
- Simple & powerful form solution for developers
- Stack: TypeScript, React, Next.js, Apollo, GraphQL, Tailwind, Koa, TypeGraphQL, TypeORM, PostgreSQL, AWS, Terraform, Jest, GitHub Actions

2011: High School Diploma - Collège Saint-Guibert, Gembloux, Belgium