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System Architect | Team Lead | CTO
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Assessing your cultural and operational fit
Computer science
Data Scientist
June 22, 2026 – Present
ios-dev-skills
July 29, 2023 – July 30, 2023
iOS Dev Skills. Performance Review. @ S. Leschev. Google Engineering Level: L7+
View Projectreact-custom-hooks
July 1, 2023 – February 24, 2024
React Custom Hooks @ S.Leschev: useArray useAsync useClickOutside useCookie useCopyToClipboard useDarkMode useDebounce useDebugInformation useDeepCompareEffect useEffectOnce useEventListener useFetch useGeolocation useHover useLongPress useMediaQuery useOnlineStatus useOnScreen usePrevious useRenderCount useScript etc.
View Projectsocial-network
January 14, 2023 – January 14, 2023
Social Network in SwiftUI with MVVM (Mobile + Back). Firebase for Login/Register. @ S. Leschev. Google Engineering Level: L6+
View Projectdesign-patterns
June 5, 2022 – July 3, 2023
Design large-scale systems / 2022 / Design Patterns: Behavioral, Creational, Structural, etc. @ S.Leschev. Google Engineering Level: L6+
View Projectcodility-swift
April 2, 2022 – May 15, 2022
🏆 Golden Award for the Year of the Tiger Challenge, Golden Award Muad'Dib's Challenge: Dynamic programming, Greedy algorithms, Binary search, Fibonacci, Euclidean algorithm. Swift 4 @ S.Leschev. L5+
View Projectleetcode-typescript
March 26, 2022 – December 11, 2024
TOP 200 #Dev 🏆 LeetCode, Solutions in TypeScript, Shell, Database (T-SQL, PL/SQL, MySQL), Concurrency (Python3). @ S. Leschev. Google Engineering Level: L6+
View Projectsystem-design
January 16, 2022 – July 30, 2023
Design large-scale systems / 2022 / Amazon, Dropbox, Instagram, Facebook, Netflix, Pinterest, Twitter, Uber, Youtube architectures @ S.Leschev. L7+
View Projectmotivation
August 15, 2021 – January 14, 2023
Health & Fitness iOS App / Fitness Motivation @ S. Leschev.
View Projectsergeyleschev
July 25, 2021 – May 21, 2024
Sergey Leschev / Team Lead / CTO. Certificates. Developer Roadmap. 🏆 LeetCode Ranking #Dev: Global TOP 200 🏆 Golden Award Muad'Dib's Challenge 🏆 Golden Award for the Year of the Tiger Challenge.
View Projectleetcode-swift
May 16, 2021 – June 2, 2024
TOP 200 #Dev 🏆 LeetCode, Solutions in Swift, Shell, Database (T-SQL, PL/SQL, MySQL), Concurrency (Python3). @ S. Leschev. Google Engineering Level: L6+
View ProjectCultural Fit Analysis
The candidate's project portfolio is diverse, covering mobile development (SwiftUI), web development (React hooks), competitive programming, and system design. This breadth suggests adaptability and a willingness to explore different technical domains. The focus on personal projects and competitive programming indicates a strong individual contributor mindset. The target role is 'Data Scientist', and while Python is listed in some projects, there's no explicit data science project or experience beyond a general 'Computer science' role as a Data Scientist starting in the future. This creates a misalignment with the target role, as the projects lean more towards software engineering and competitive programming rather than specific data science applications.
Soft Skills & Operational Fit
The candidate's project descriptions suggest a self-driven individual with a strong inclination towards continuous learning and competitive problem-solving. The mention of 'Google Engineering Level: L6+' and 'L7+' in project descriptions indicates high aspirations and a focus on high-performance engineering. However, without specific psychometric test results or interview data, it is difficult to assess collaboration, stress handling, or work attitude.