Just let me cook.

Simon Hylander. Senior Software Engineer in Stockholm.

Working on growth and integrations at Proposales

See the work Get in touch

Shipping

2,583 contributions in 12 months

Most of my code is in private repositories. The projects below describe it.

Projects. Open one to see it working.

01 / 04Integrations
BankID: Swedish e-ID.
FTN: Finnish e-ID through the Finnish Trust Network.
Stripe: Card payments.
Swish: Swedish mobile payments.
Ping Payments: Marketplace payments.
nShift: Shipping.
Schenker: Freight.
Treddy API
Treddy partner platformA partner platform for a fraud-prevention startupTreddy, 2021–2024
02 / 04Architecture
Share of /projects traffic served by Next.js
A CloudFront Function sends this share of /projects requests to the new Next.js client. The rest stays on the legacy monolith.
Byggdagboken strangler-fig migrationA live web platform moved from PHP to Next.jsByggdagboken, 2024–2026
03 / 04AI
Before100%
With AI pre-review100%
AI code review at ByggdagbokenAI code review for a product teamByggdagboken, 2024–2026
04 / 04AI
scrape
embed
retrieve
answer
UppgraderingspaketAn AI price-matching search for PC hardwareUppgraderingspaket, 2025–now

Tools I build with.

T3 Code
Claude Code
Codex
TypeScript
Effect
Node.js
React
Postgres
Convex

12 years, 5 companies

Docu NordicJunior Developer2014–2016
Docu Group SwedenSoftware Developer2016–2018
SkoglitSenior Software Engineer (consultant)2018–2024
ByggdagbokenSenior Software Engineer2024–2026
ProposalesFull Stack Engineer2026–now