Daniil Fedyaev Email & Phone Number

Munich, Bavaria, Germany

Bishkek, Kyrgyzstan

Led a small team in development of 5 python microservices.* Recommendation service that selects products relevant for a particular user based on multiple parameters. Thanks to good architectural planning and 100% test coverage, the new product selection methods were natively integrated into the existing logic of filtering and prioritization of sponsored products. The service also collected and processed analytical data from GTM to improve the relevance of recommendations based on the… Show more Led a small team in development of 5 python microservices.* Recommendation service that selects products relevant for a particular user based on multiple parameters. Thanks to good architectural planning and 100% test coverage, the new product selection methods were natively integrated into the existing logic of filtering and prioritization of sponsored products. The service also collected and processed analytical data from GTM to improve the relevance of recommendations based on the user's browsing history. Requests from GTM due to their quantity were buffered in the memory of the service, which allowed us to increase RPS x20 times. Abstracting recommendations logic allowed us to reuse it in different APIs of the application (gRPC, HTTP) without worrying about possible discrepancies in the logic dictated by the chosen interface of interaction with the service.* Chatbot on ChatGPT allowing users to find the product they are interested in during the dialog. The main difficulty of development was to compose the right initial prompts for chatgpt and to isolate it from attempting to recommend a product to the user independently, practically making up the recommended product.* Data synchronization service from 30+ project services to CRM. The main task of the service was to collect data from available sources (gRPC, Kafka), batching (respectively deduplication and ordering creation/updating of the entities) and sending the batches to CRM system. In this service we have successfully implemented event driven architecture, which allowed us to change/add/remove event handlers as we wish, as well as to test them in isolation.* Geolocation service interacting with several location data providers (Google Maps, Maxmind, GeoNames) providing location search with georedis and location autocomplete with rediserarch.* Service layer between browser and gRPC. Written in FastAPI because it was fast (pun intended). We passed on grpc-gateway because sometimes the service had Show less

St Petersburg City, Russia

Developed a robust backend for popular browser games using Python with FastAPI and aiohttp. Successfully managed 500+ simultaneous WebSocket connections, ensuring optimal player experience. Utilized Locust for stress testing, ensuring system resilience under high demand. Employed Kubernetes for efficient deployment and CI, streamlining the development pipeline. Played a pivotal role in significantly boosting business revenue through technical innovations and seamless gameplay experiences.

St Petersburg City, Russia

Developed backends for diverse web applications, including:Prism: Designed a unique bookmarking system capturing real-time screenshots of user bookmarks. Implemented using Selenium and a headless Xorg server, ensuring up-to-date visual previews for users.Bulls vs Bears: Pioneered a binary option system built on Ethereum smart contracts, complemented by a GraphQL API. Undertook the challenge of optimizing the GraphQL parser, which significantly enhanced response times for… Show more Developed backends for diverse web applications, including:Prism: Designed a unique bookmarking system capturing real-time screenshots of user bookmarks. Implemented using Selenium and a headless Xorg server, ensuring up-to-date visual previews for users.Bulls vs Bears: Pioneered a binary option system built on Ethereum smart contracts, complemented by a GraphQL API. Undertook the challenge of optimizing the GraphQL parser, which significantly enhanced response times for extensive queries, providing users with swift and efficient interactions.Both projects underscored a commitment to innovative solutions and optimizing user experiences, showcasing technical proficiency and a knack for tackling complex challenges.After that i worked on binary option on smart contracts with graphql api. Show less

St Petersburg City, Russia

Developed intricate backends for advanced systems, encompassing:TV Boxes Updates: Architected a dedicated update service catering to client TV boxes. Utilized aiohttp to ensure efficient and smooth delivery of software updates, guaranteeing optimal performance and up-to-date features for end-users.System Analytics Platform: Spearheaded the creation of a comprehensive analytics system. Incorporated gRPC for efficient communication, combined with the Go programming language for… Show more Developed intricate backends for advanced systems, encompassing:TV Boxes Updates: Architected a dedicated update service catering to client TV boxes. Utilized aiohttp to ensure efficient and smooth delivery of software updates, guaranteeing optimal performance and up-to-date features for end-users.System Analytics Platform: Spearheaded the creation of a comprehensive analytics system. Incorporated gRPC for efficient communication, combined with the Go programming language for optimal backend performance. Integrated NATS for seamless and scalable messaging, ensuring real-time and accurate data processing. Show less

St Petersburg City, Russia

Developed sophisticated backends for diverse applications, including:Offline Events Scraping System: Pioneered a global events collection platform. Introduced a deduplication mechanism for events based on their title, location, and timing. Additionally, crafted a bespoke service facilitating the dynamic deployment and management of scrapers. This not only empowered the QA team with direct control over deployment and termination but also optimized cluster resource… Show more Developed sophisticated backends for diverse applications, including:Offline Events Scraping System: Pioneered a global events collection platform. Introduced a deduplication mechanism for events based on their title, location, and timing. Additionally, crafted a bespoke service facilitating the dynamic deployment and management of scrapers. This not only empowered the QA team with direct control over deployment and termination but also optimized cluster resource utilization.Chat Application in HyLang: Delved into functional programming to architect a chat application using HyLang, backed by MongoDB. This venture offered a unique exploration into harnessing the synergies of functional paradigms with modern database systems.Public Transportation Payment System: Rolled out a holistic solution enabling passengers to pay for rides via a mobile application or SMS. To broaden payment avenues, a dedicated ATS was also deployed, making payment through calls feasible.Across these projects, showcased versatility in backend development, blending innovation with efficient solutions to address distinct challenges. Show less