Hello!
Sebastian Töllke
Software Engineer, Terminal Enthusiast
Kind Software Engineer with a demonstrated history of working in the industry and experience across monolithic, distributed, and serverless architectures. Whether you're looking to build using on-prem hardware, remote, or using AWS and Cloudflare primitives: I'm here to help you make it happen with care and attention to detail.
Building fast, secure, cost-effective, and smooth User Experiences is extremely satisfying to me. If you need help managing CI/CD flows, I do some of that too.
My background is in electrical engineering. Nowaways I spend my time exploring Web tech, building tools, and learning as much as I can. I actually thrive in learning something new every day!
I trained a model on my life in Google Vertex and all I got was this lousy summary: "Seb likes making music, woodworking to build furniture for his tuxedo cat, cooking spicy food, exploring the world, charity work, the occasional twitch stream, and finding rare youtube videos."_
Professional Experience
Cloud Architect at JustFab Ltd.
Jun '24 – Present- Planned and built multi-brand cloud architecture for high availabiltiy and high global traffic.
- Designed an edge‑native inventory backend and API on Cloudflare Workers/KV/DO/D1/R2, delivering high availability at a predictable spend for essential services.
- Re‑platformed a key B2B API with Terraform + GitHub Actions. Took the opportunity to cut delivery lead‑time 60% and reduce p95 latency from 6.5s to less than 900ms.
- Leading a company simplification roadmap and forecast to shrink service footprint 24% by consolidating providers, simplifying architecture, and retiring legacy microservices.
Staff Software Engineer at JustFab Ltd.
Nov '23 – Aug '24- Consolidated fragmented APIs for better SLAs, achieving 94% faster responses and steadier costs.
- Helped deliver a high‑pressure front‑end stack migration while removing all legacy code and reducing servicepartner cost.
- Planned, built, and operated a global B2B partner API on AWS (Lambda orchestration, On-Prem SQL Server, Cognito OAuth, Kinesis → Graylog streams), now serving international production traffic.
Engineering Team Lead at JustFab Ltd.
Apr '22 – Nov '23- Managed a 5-engineer, fully-remote engineering team to serve JustFab, FabKids and ShoeDazzle, lifting overall system stability by 18% and doubling cache hit-rates.
- Introduced Sentry/Graylog error-replay workflow, cutting mean-time-to-detect.
- Integrated Builder.io into the legacy stack, unlocking content self-service for 26+ business users.
Senior Software Engineer at JustFab Ltd.
Apr '20 – Apr '22- Led the Foundation team, creating cloud-native microservices that cut API latency 30-40% and enabled rapid A/B roll-outs across JustFab, ShoeDazzle, FabKids & Fabletics Ltd.
- Drove the business-critical shift to fully remote development across North-American units.
Senior Software Engineer at TechStyle Fashion Group
Apr '18 – Apr '20- Formed a hyper-agile Foundation team that boosted site speed, checkout success & retention >30% using edge-first and micro-service patterns.
- Embedded React/Next.js into the monolith, modernizing DX and CX.
Web Developer at JustFab GmbH
Sep '14 – Apr '18- Built the first mobile storefront for all EU markets (jQuery, ColdFusion, image optimization).
- Created an email-templating engine that cut turnaround time 40% and increased deliverability.
- Led a US-EU code-autonomy program, shrinking release cycles.
Technical Expertise
Over the years of my professional career I've worked with many different services, systems, languages, frameworks, and libraries. While this list is not comprehensive it should give you a half-decent overview of the technologies that I am comfortable with.
- JavaScript (TS)
- Golang
- Bash
- Python
- PHP
- SQL
- React
- Next.js
- Remix
- Astro
- Vue
- Nuxt
- SolidJS
- Svelte
- Redux
- Jōtai
- Zustand
- Styled Components
- Tailwind CSS
- SASS/SCSS
- Vitest
- Jest
- Puppeteer
- Vite
- Webpack
- Turbopack
- Turborepo
- Nx
- Hono
- Bun
- ElisyaJS
- NestJS
- Express
- FastAPI
- AWS
- Cloudflare
- Vercel
- Fly.io (flyctl)
- Netlify
- Docker
- Kubernetes
- sst
- Terraform
- Figma