Oleh Poratui@prod:~$

Backend engineer in London. Python, FastAPI, PostgreSQL, AWS. I get paged when something serious breaks, and I fix it before the customers notice.

incident-0417 — postmortem.log
mail me

Measured outcomes

What changed after I owned the system.

70%Faster platformBackend redesign and query execution tuning across the core services.
20 minCritical outage resolvedProduction database failure diagnosed and recovered before it became a financial event.
150kActive UK users servedAuthentication, core backend services and cloud API infrastructure.
85%Less operational overheadAutomated failover and continuous health checks replaced manual intervention.
200kCustomers served dailyInventory APIs, supply-chain databases and checkout microservices across a retail network.
50%Less manual admin workAutomated internal data workflows and AI-driven features across cross-functional teams.
35%Quicker deploymentsCI/CD on GitHub Actions and Docker, standardised across teams.
40%Lower memory footprintLegacy technical debt removed and server memory consumption cut on core systems.

Experience

Four years on systems where downtime has a price tag.

Jan 2024 — 2026London, UK

Middle Software Engineer

Tech Solutions Ltd

  • Recovered a critical production database failure in 20 minutes, preventing a platform-wide outage and the losses that would have followed.
  • Took full ownership of core backend services, user authentication and cloud API infrastructure serving over 150,000 active UK users.
  • Redesigned the backend architecture and tuned query execution, raising overall platform performance by 70%.
  • Engineered automated failover and continuous health monitoring, removing application downtime and cutting infrastructure overhead by 85%.
  • Integrated automated internal data workflows and AI-driven features, halving manual administrative processing across cross-functional teams.
Jun 2022 — Dec 2023Kharkiv, Ukraine

Software Engineer

Klass Retail Group

  • Ran inventory APIs, supply-chain databases and checkout microservices for a retail network handling 200,000+ customers a day.
  • Built CI/CD pipelines on GitHub Actions and Docker, accelerating deployment cycles by 35%.
  • Authored automated test suites in PyTest and Jest, holding over 85% coverage across core codebases.
  • Cut legacy technical debt and reduced server memory consumption by 40%.

Toolkit

Chosen for what production needs, not what is fashionable.

Languages

Python, TypeScript, JavaScript, SQL, C++, Bash

Backend

FastAPI, Django, Node.js, Express, REST and GraphQL APIs, microservices, system architecture

Data

PostgreSQL, Redis, MongoDB, query tuning, index and schema optimisation

Cloud and operations

AWS, Docker, Kubernetes, Terraform, GitHub Actions, CI/CD, Linux

AI integration

LangChain, OpenAI API, LlamaIndex, vector databases — Qdrant and Pinecone

Practice

Test-driven development, code review, monitoring and alerting, security fundamentals, Agile and Scrum

Contact

Open to backend and platform roles in London or remote.

Fastest by email. Happy to walk through architecture decisions, incident write-ups or code on a call.

emailoleh.poratui@gmail.com phone+44 7300 416849 linkedinoleh-poratui