System Architect | Team Lead | CTO
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 React Custom Hooks (Google Engineering Level: L6+) Roadmap.
github.com/sergeyleschev/react-custom-hooks/blob/main/README.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.

DeFi
Web 3.0: Solidity, Javascript, Hardhat, REMIX, Ethers.js, Ganache, TypeScript (react.js, node.js).
Solidity (Consensys, Alchemy), Metamask, SafePal, Launchpad, PancakeSwap (BNB), Uniswap (ETH), Dextools/PooCoin, Gas/gwei Optimization, Front-Runner Bots, Slippage Optimization, CEX/DEX, Binance Smart Chain (BNB), Ethereum (ETH), Polygon (Matic), Tokens List [Coinmarketcap;CoinGecko].

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 University
Faculty of Applied Mathematics & Informatics.
Computer science / Mathematician-system programmer.

Licenses & certifications
? LeetCode Global TOP 200 (Swift: Certificate, Sources: Swift, Sources: TypeScript).
? Golden Award for the Year of the Tiger Challenge (Swift: Certificate, Sources: Swift).
? Golden Award Muad'Dib's Challenge (Swift: Certificate, Sources: Swift).
2022 Oct LeetCode Challenge (2022-10-31).
2022 Sep LeetCode Challenge (2022-09-30).
2022 Aug LeetCode Challenge (2022-08-31).
2022 July LeetCode Challenge (2022-07-31).
2022 June LeetCode Challenge (2022-06-30).
2022 May LeetCode Challenge (2022-05-31).
2022 Apr LeetCode Challenge (2022-04-30).
LeetCode Dynamic Programming (2022-05-07).
Graph Theory (2022-04-30).
SQL (2022-04-26).
Algorithm I (2022-04-30), Algorithm II (2022-05-21).
Data Structure I (2022-04-30), Data Structure II (2022-05-21).
Binary Search I (2022-04-28), Binary Search II (2022-05-18).
Programming Skills I (2022-04-28), Programming Skills II (2022-05-18).
Facebook Blueprint, Snap Inc, Bytedance, AppsFlyer (Marketing SDK), Google Analytics (SDK, GA4, UA).
Internet Initiatives Development Fund (IIDF / Economics).
Stanford University (Swift: UIKit, SwiftUI).
Coursera (Swift): Best Practices For iOS User Interface Design, Networking And Security in iOS Applications.
Zdes i Sejchas Consulting Group (Professional Management Skills, Agile Methodologies).
LinkedIn Skill Asessment (Mobile): Swift (Programming Language), Object-Oriented Programming (OOP), Objective-C, C++, Ionic, JSON, XML, Android, Kotlin, Maven, Java, REST APIs.
LinkedIn Skill Asessment (Front-End): Front-end Development, Angular, React, Javascript, HTML, CSS (scss), jQuery.
LinkedIn Skill Asessment (Back-End): Node.js, Java, Spring Framework, Scala, C#, .NET Framework, Unity, Python (Programming Language), Django, PHP, C (Programming Language).
LinkedIn Skill Asessment (Databases): MongoDB, NoSQL, Transact-SQL (T-SQL), MySQL.
LinkedIn Skill Asessment (Infra/DevOps): Bash, Git, Amazon Web Services (AWS), AWS Lambda, Google Cloud Platform (GCP), Microsoft Azure, Hadoop, IT Operations.
LinkedIn Skill Asessment (AI): Machine Learning, MATLAB, Python AI, R (Programming Language).

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
? Github: github.com/sergeyleschev
? LinkedIn: linkedin.com/in/sergeyleschev
? Twitter: twitter.com/sergeyleschev
? Website: sergeyleschev.github.io
? Reddit: reddit.com/user/sergeyleschev
? Quora: quora.com/sergey-leschev
? Medium: medium.com/@sergeyleschev

ALT: SIARHEI LIASHCHOU