Software Engineer

Sebastian Oliver

I build scalable backend systems and cloud infrastructure. Focused on distributed architectures, developer experience, and engineering that ships.

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About

Engineering at scale

Software Engineer at a cloud consultancy building serverless and event-driven systems on AWS. I deliver modernization and migration projects for clients - shipping scalable cloud-native architecture in agile environments.

Cloud Engineering

Building and modernising cloud-native systems on AWS - serverless architectures, CDK infrastructure, and large-scale migration projects for enterprise clients.

Full Stack Development

From Next.js frontends serving content from headless CMSes to backend services and distributed pipelines - comfortable across the full stack.

Beyond the Screen

Trail running, climbing, and endurance sports. The same discipline that goes into a long run goes into building reliable systems.

Experience

Where I've worked

Jan 2023 — Present

Theodo (formerly Aleios)

Cloud Engineer

A cloud consultancy focused on serverless and event-driven architectures. Delivering modernization and migration projects for clients by building scalable AWS-based cloud-native systems, implementing infrastructure as code, and developing distributed backend services in agile consulting environments.

  • Led development of an internal CDK constructs package for an enterprise client to enforce best practices and standardization across teams
  • Modernised legacy AWS infrastructure from a mix of Terraform and Serverless framework to AWS CDK
  • Maintained legacy AWS infrastructure serving 80,000 requests a minute daily
  • Migrated a catalog service from Azure to AWS, leading the database refitting from Cosmos to Postgres
  • Modernized 44+ pages of a European Airlines frontend using Next.js and Tailwind, serving content from a headless CMS (Contentful)
  • Co-led development of an AWS X-Ray tracing tool to provide visibility into feature latency impact
AWS CDKTypeScriptServerlessNext.jsTailwindDatadogAWS X-RayTerraformRetool.NET (C#)

Projects

Selected work

Side projects I built to scratch my own itch - each one started as a problem I had and couldn't find a good solution for.

monthly-tracks

monthly-tracks

Spotify monthly playlist generator

Every month I'd manually trawl through my liked songs to remember what I'd been listening to. Built this to automatically generate a playlist from whatever I saved that month — now it just happens.

Next.jsTypeScriptTailwindSpotify API
vroom-vroom

vroom-vroom

Strava running stats visualizer

I wanted a better way to look back at my running — Strava's own UI buries the data I actually care about. Built a personal dashboard that pulls my activity history via the Strava API and visualises it the way I want to see it.

Next.jsTypeScriptTailwindStrava APISupabase
get-in-me-bucket

get-in-me-bucket

Mobile-first personal image bucket

I wanted a dead-simple way to dump photos from my phone to S3 without going through Google Photos or iCloud. Built a minimal PWA that uploads directly to S3 via presigned URLs — no middleman, no compression, just my files in my bucket.

Next.jsTypeScriptAWS S3PrismaPostgreSQLAuth.jsTailwind

Skills

Tools & technologies

The stack I work with most. Focused on the backend and cloud, with enough frontend to ship full products.

Frontend

TypeScriptReactNext.jsTailwind CSSRetool

Backend

AWS ServerlessTypeScript.NET (C#)

Observability & Analytics

DatadogAWS X-RayCloudWatch

DevOps & Automation

GitHub ActionsCI/CD PipelinesAWS CDKTerraform

Certifications

AWS Cloud Practitioner