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Jakub Zając
Technology stack

Tools I take responsibility for

This list is shorter than an agency's — on purpose. I pick technologies I know well enough to vouch for their maintenance.

Languages & frameworks

The base for web, mobile and backend application work.

  • TypeScript
  • JavaScript
  • Python
  • React
  • Next.js
  • React Native
  • Expo
  • Node.js

Testing & quality

UI, API and data test automation — including CI pipelines.

  • PyTest
  • Test automation
  • API testing
  • Integration testing
  • CI-integrated testing

Cloud & DevOps

Production environments, deployments and infrastructure as code.

  • AWS
  • S3
  • Glue
  • Redshift
  • IAM
  • CloudWatch
  • Docker
  • Terraform
  • GitHub Actions

Databases & data

Schema design, migrations, validation and data reliability.

  • PostgreSQL
  • Supabase
  • SQL
  • ETL / data pipelines

Support & administration

The day-to-day company environment — systems, accounts and networks.

  • Windows
  • Microsoft 365
  • Google Workspace
  • Networks & Wi-Fi
  • Backup

If your project uses technology outside this list, I will tell you plainly whether I'll take it on or point you to a better specialist. I would rather decline than learn on your budget.

Not sure which stack to choose?

Describe the product and I will propose the simplest stack that does the job — with the reasoning behind every choice.