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Sergey Leschev
@Leschev
Tech Lead / System Architect / LCode #Dev TOP 200
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- About
- Tech Lead / System Architect
Google Engineering Level: L7+
Swift, TypeScript, SQL
🏆 LeetCode Ranking #Dev: Global TOP 200.
🏆 Golden Award Muad'Dib's Challenge (Swift).
🏆 Golden Award for the Year of the Tiger Challenge (TypeScript).
I have a clear focus on time-to-market and don't prioritize technical debt. I took part in the Pre-Sale/RFX activity as a System Architect, assessment efforts for Mobile (iOS-Swift, Android-Kotlin), Frontend (React-TypeScript) and Backend (NodeJS-.NET-PHP-Kafka-SQL-NoSQL). And I also formed the work of Pre-Sale as a CTO from Opportunity to Proposal via knowledge transfer to Successful Delivery.
🚀 Developer Roadmap
S.Leschev iOS Developer (Google Engineering Level: L6+) Roadmap.
github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-ios-roadmap.md
S.Leschev FullStack Developer (Google Engineering Level: L6+) Roadmap.
github.com/sergeyleschev/sergeyleschev/blob/main/sergeyleschev-fullstack-roadmap.md
S.Leschev Responsive Email Design (Engineering Level: L6+) Roadmap.
github.com/sergeyleschev/responsive-email-design/blob/main/sergeyleschev-responsive-email-design.md
S.Leschev Design Patterns (Google Engineering Level: L6+) Roadmap.
github.com/sergeyleschev/design-patterns/blob/main/sergeyleschev-design-patterns.md
S.Leschev System Architect (Google Engineering Level: L7+) Roadmap.
github.com/sergeyleschev/system-design/blob/main/sergeyleschev-system-architect-roadmap.md
💻 Technologies
Tech Stack (L7+)
Swift [4, 5+, UIKit, MVP/VIPER/MVVM, Autolayout, UIKitPlus, GCD/Operations/Concurrency 5.5+, Alamofire, ObjectMapper, SwiftLint, SwiftGen, FP, pre/after-main opt], SwiftUI [iOS, watchOS, Widgets, App Clips], Apple TV/AirPlay [Composition, Secondary Display], Realm, Lottie, JWT, CryptoSwift, RxSwift, Vapor [API;Fluent;Migrations], SwiftNIO, REST, Firebase, Java [7-8], PWA, Angular [2-6+], Ionic Framework [3-5+], React Native [Redux, MobX], JavaScript, React [Next.JS; Redux, Redux Tookit +Slice/Immer, Prime React], CSS [scss], Node.js [10x Express/SQL;14x NestJS 6;7+/TypeORM], TypeScript (+ESLint, Jest), C#, .Net Core [1-3+], MS SQL [2016+], SQL, Objective-C, MongoDB [3.6, 4.4, Config, Replication, Sharding], RabbitMQ, GraphQL [Schemas; Resolver; Request; Validation; Queries&Mutations; Apollo; Reactive], Apache Kafka, Mockapi, Mac Os, iOS [10;12;13;14+], Android, OneSignal, Localization (Phrase/json/i18next), Zeplin, Figma, Sketch.
Analytics (L6+)
Tableau, Amplitude [SDK], AppsFlyer [SDK 5, 6+, Raw Data, Data Locker, Protect360, web-2-app, People-Based Attribution (PBA), Conversion Path, OneLink], Facebook for Business [SDK, Graph, Conversions Api, Pixel, Reports], Snapchat, TikTok, Google Tag Manager (GTM), Google Analytics [GA4;UA], Apple SKAd (+PCM), Qlik, Yandex, Hotjar, SplitMetrics, Apphud, Appfollow, A/B testing, Airflow, Airbyte, Qonversion.
Infra/DevOps (L6+)
CI/CD tools [XCode Cloud, Github Actions/DO, Jenkins, Codemagic, Gitlab, AWS CodeBuild], Git [+Flow], Chromium + Transporter, Instana, Freshworks, Docker [+compose], Twilio, Zapier, Linux [+ssh, iptables, Ubuntu 16/18/20+, snap/apt/npm/yarn/brew], Amazon Web Services (AWS), Digital Ocean (DO), GRE, IPSEC, VPN, Cloudflare [DNS, CDN, SSL, Guard, Rules], Crashlytics, Grafana, Sentry, RayGun, Nginx, Let's Encrypt [SSL], Win Server [+PowerShell], IIS, Pingdom, UptimeRobot, Apache JMeter, PAW, Postman, Charles Proxy, Indigo Browser, Published Apps [Apple AppStore, Google Play, Amazon Appstore, Huawei AppGallery, Galaxy Store, Snapcraft].
Payment Providers (L6+)
Apple StoreKit [+Retention, Sales Reports], Stripe [nest-SDK, node-SDK, Stripe Checkout, Stripe Elements, Stripe Prebuilt Page, Stripe via iframe, Sigma SQL Financial Reports], PayPal [SDK], high-risk processing providers [Solid Payments, Recurly, SolidGate, Braintree], CloudPayments, DCB (fortumo), Paymentwall, SafeChange, CCBill, Klarna, Pikassa, Paymentwall, Exactly, Realisto, Cypix, Payselection.
PM Stack (L7+)
Agile [Scrum, Kanban, +V&E +MoSCoW +ICE +RICE, PRINCE2], Driven Development [TDD, BDD/QUICK, DDD, FDD], ISTBQ, Clickup, Jira, Confluence, Notion, Asana, Team Foundation (TFS), Miro, diagrams.net/ERD, Microsoft Project, OmniPlan, UML [IBM Rational Rose, Visio], Reetro.
🏫 Education
2004 – 2009
Belarusian State UniversityFaculty of Applied Mathematics & Informatics.Computer science / Mathematician-system programmer.
My Favorite Book is Dale Carnegie «How to Win Friends & Influence People».
The principles of which I use in my life:
1. Become genuinely interested in other people.
2. Smile.
3. Remember that a person's name is to that person the sweetest and most important sound in any language.
4. Be a good listener.
5. Talk in terms of the other person's interests.
6. Make the other person feel important — and do it sincerely.
Contacts:
🛩 #startups #management #cto #swift #typescript #database
📧 Email: sergey.leschev@gmail.com
👋 LinkedIn: linkedin.com/in/sergeyleschev
👋 Reddit: reddit.com/user/sergeyleschev
👋 Twitter: twitter.com/sergeyleschev
👋 Github: github.com/sergeyleschev
🌎 Website: sergeyleschev.github.io
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Specialization
Fullstack Developer, Mobile Application Developer
Lead
SWIFT
SwiftUI
TypeScript
Node.js
React
JavaScript
SQL
MongoDB
PostgreSQL
DevOps