Sean O'Brien — AWS Solutions Architect

senior solutions architect

i cut aws costs for engineering teams.

if your cloud bill is growing faster than your revenue, you're likely wasting 30–40%. i find it and fix it — without touching your product code.

  • 7x aws certified
  • available for new projects
  • response within 24 hours

trusted by 10+ engineering teams across the uk & us

what i've delivered

30%

cost reduction

fast-fashion · e-commerce

aws cost optimization, right-sizing at scale

aws spend was growing with no visibility into what was driving it. introduced cost allocation tags across all resources for accurate budgeting, then right-sized infrastructure using power tuning tools — cutting aws billing costs by 30% across the platform.

cost allocationpower tuningright-sizingcloudwatch
500k

concurrent users

e-commerce · high-traffic

black friday architecture, 500k concurrent users

peak traffic events like black friday were the biggest risk to the platform. orchestrated a high-performance microservice architecture with active-active multi-region routing via route 53 — successfully sustained 500k concurrent users during load testing and peak sale events with zero downtime.

api gatewaylambdaroute 53ecs
zero

downtime

e-commerce · multi-brand

multi-account migration, zero downtime cutover

critical aws resources needed isolating into a multi-account structure for security, cost separation, and service quotas. architected and executed the migration across api gateway, lambda, dynamodb, sqs, sns, s3, rds, and route 53 — with zero downtime across all services.

terraformdynamodbrds auroraorganizations

your results could be next.

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what i can help with

cloud cost audit

full review of your aws spend — rightsizing, waste elimination, and reserved instance planning. most audits find 25–40% in savings.

get a quote

architecture review

deep dive into your infrastructure design. i identify reliability gaps, scaling bottlenecks, and security risks before they become incidents.

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infrastructure migration

move from legacy setups to modern, cost-efficient architectures. i handle the planning, the execution, and the handover.

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no consultants. no decks.

01

quick call

we jump on a call, you tell me what's going on. no questionnaires, no scoping documents.

02

i join your slackdifferentiator

i embed with your team. real-time communication, not status reports and weekly check-ins.

03

i fix the problems

i get into your aws environment and start making changes. you see results, not slide decks.

04

you keep the savings

once the work is done, the improvements are yours. no lock-in, no dependencies on me to keep things running.

most engagements wrap in 4–6 weeks. the savings last forever.

stop overpaying for aws.

let's fix it this week.

no commitment · 30 minutes · i'll tell you exactly what i'd fix

book a free audit

let's talk about your aws costs

i review every message personally and respond within 24 hours. tell me your monthly aws spend and what's worrying you — that's enough to start.

your details are never shared or sold.

prefer to reach out directly?