Sebastian Ghetu

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phone: (+44)749 0611 641

Mobile app developer, cloud computing enthusiast and master of finding simple solutions to complex problems. My life focus is on craftsmanship in software development, whether that means delivering great user experiences, clean code or system architectures that can scale. When I'm not writing awesome code, I enjoy cycling, playing tennis, travelling to interesting places and learning about the local culture. Oh, and riding my electric scooter!

Latest

Bumble

Senior iOS Engineer | Oct 2021 - Present

UI committee lead, 2nd stage interviewer, release manager
Shipped features and fixes to critical components such as the swiping game, profile, profile editor and chat. Features: videos on profiles, profile sharing, community badges on users’ profiles. Substantial work to implement a completely new mode inside the app, with a new theme and matching dynamics
Technical contributions: design system metadata collection tooling, profile editor modularisation, SwiftUI design system components migration, automated performance measurements
Key app stats: 58 million monthly active users, over 2 million paid subscribers, top 3 dating app for almost all countries it’s available in, millions of lines of code, extensive test stack (unit, component, VRT, E2E), tens of localisations

Bumble: Feedback received

Career

Capital One

iOS Software Engineer - Principal Associate | Jan 2020 - Oct 2021

Successfully shipped to a considerably larger user base, on a project with a code base an order of magnitude larger than in the previous role - all in a highly-regulated environment
Made substantial contributions to web backend work, from service code in Spring Boot or provisioning cloud-based network infrastructure to debugging complex outages in an AWS multi-account environment
Lead the iOS Community of Practice, driving direct engagement with our customers and maintaining exemplary crash-free rates
Revamped all Agile ceremonies within the team, from stand-ups to PI planning. Made numerous delivery and process improvements
Mentored 2 junior iOS engineers; held 1:1 sessions with product owners explaining our tech stack and capabilities
Lead a series of AWS study sessions which resulted in 4 other engineers obtaining AWS Associate certifications. Gave a talk in a UK-wide internal conference about the sessions, highlighting how the model could be replicated more widely
Conceived and organised a recurring Lightning Talks event which encourages practicing public speaking and has hosted over 10 talks in the first half of 2021

Capital One: Feedback received

Experian

iOS Engineer | Oct 2018 - Dec 2019

Delivered strategic features and bug fixes to a user base that grew significantly in the last year, reaching hundreds of thousands of monthly active users
Enabled revenue growth that outpaced user growth by optimising lead-generating app journeys
Focused on industry-leading UX and stability, driving up the app store reviews from 4.3 stars to 4.8 and the crash-free rate to 99.9x%
Developed risk-based approaches to delivering features without putting the app's substantial monthly revenue at risk
Helping reduce the mobile team's dependence on other service teams by building the company's first Kotlin web service
Took leadership roles within the Agile (SAFe) team, from driving feature refinement to organising daily stand-ups
Involved in all stages of the software development lifecycle, from design to distribution

Freelance (Hallam Digital)

iOS Engineer | Jan 2019 - Feb 2020

Built the iOS app for UK's largest virtual running community, in partnership with one of Nottingham's top digital marketing agencies, Hallam Digital
Worked fully remotely while successfully maintaining communication and collaborating with the rest of the team and client
Delivered an app to Production in less than 200 hours, working with the client to pick the features that would offer the best return on investment for an MVP

Hallam: Feedback Received

Roller Agency

Head of Development | Jul 2017 - Sept 2018

Led a team of 6-10 engineers, acting as a line manager and an advocate for good software development practices
Successfully shipped for clients such as The University of Huddersfield, Northumbria Police, The University of Edinburgh
Continued working as a developer, contributing to time-critical and high-value projects and personally leading the development of 3 projects
Established processes for development and planning, enabling the company to undertake larger-scale projects. Introduced new technologies such as Amazon Web Services, Firebase and Realm Mobile Platform to increase productivity without compromising on quality
Heavily involved in all new project proposals, deciding upon software stacks and time estimates. Pitched our proposals in front of potential clients such as the NHS

Mobile App Developer | Apr 2016 - Jun 2017

Helped architect and build 7 mobile applications for both iOS and Android, most published to app stores
Architected and contributed to building a large scale iOS SDK and app (with over one year of continuous development) based on the MVVM architecture and functional-reactive programming (using ReactiveSwift)

Cornerstone Tech

Mobile App Developer | Jul 2015 - Aug 2015

Designed and developed native Android, Android TV apps for a US-based media startup
Learned about iOS development and built a production-grade app in one month

Personal Projects

Untitled

RepBuddy • App Store • Website

2023 - Present

Workout tracker I have designed and built for myself and then published
Focused on simplicity and a native feel. Fully compatible with all accessibility features
Fully built in SwiftUI. Swift Charts integration for weight tracker. CoreData & iCloud sync for data storage. StoreKit integration for in-app purchase
iOS, iPad (& Mac), Apple Watch compatibility

Skills

iOS app development

Highly experienced in iOS development with Swift, with a great working knowledge of modern frameworks like SwiftUI & Combine
Testing: XC(UI)Test, snapshot testing
App architecture patterns: MVC, MVVM
Mobile databases: Core Data, Realm, Firebase Realtime Database
Code generation: Sourcery, Swift macros
CI/CD platforms and tools: Fastlane, Jenkins, AWS CodeBuild/CodePipeline, Bitrise
Functional-reactive programming frameworks: Combine, ReactiveSwift, RxSwift
Versioning: git (gitFlow, trunk-based)
Analytics & logging frameworks: Splunk, Mixpanel, Firebase, Fabric, Logz.io, AppDynamics
Design and handoff: Figma, Sketch, Zeplin, InVision, Miro, Freeform

Cloud

Good working knowledge of core AWS services across VPCs, Compute, Storage and Databases

<aside> <img src="/icons/document_gray.svg" alt="/icons/document_gray.svg" width="40px" /> Certified AWS Solutions Architect - Associate

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Other technical skills

Former Android engineer (using Java). Various levels of experience (in descending order) with other mobile frameworks: Ionic, Flutter and React Native

Other skills

Passionate about mentoring engineers as a way of investing in people while getting things done
Product-focused and exceptionally motivated by shipping features that make a difference in people's lives
Commercially-savvy within the mobile ecosystem, with experience in both agency and in-house environments

Education

MSc Advanced Software Engineering

University of Leicester | Sept 2015 - Jan 2017

Graduated with a Distinction, building a complex health-tracking app and carrying out extensive UX research against it as part of my dissertation

BSc Computer Science

University of Bucharest | Sept 2012 - June 2015

Graduated with a 2:1 after being awarded 100% on the practical project - an Android dash cam app published on Google Play