Logo
Razvan – Golang, PHP, Solidity, experts in Lemon.io

Razvan

From Romania (GMT+3)

flag
Back-end Web DeveloperSenior
Hire developer
9 years of commercial experience
Advertising
Analytics
Blockchain
Business intelligence
Cryptocurrency
E-commerce
Fashion
Fintech
Healthcare
Mental healthcare
Retail
Social media
Sports
AI software
CRM
Platforms
Web3
Lemon.io stats

Razvan – Golang, PHP, Solidity

Razvan is a seasoned Senior Go developer with 9 years of extensive experience in the tech industry. Over the past decade, he has contributed to the development of robust systems and collaborated with teams to deliver exceptional web2 and web3 applications. What distinguishes Razvan is his profound expertise in Microservices architecture. He excels in designing and implementing microservices-based solutions, demonstrating a keen ability to optimize and streamline systems for maximum efficiency.

Main technologies
Golang
5 years
PHP
5 years
Solidity
2 years
Microservices
6 years
Blockchain
2 years
Shopify
2 years
Additional skills
MySQL
Python
Web 3.0
Redis
Algorithms and Data Structures
API
Ethereum
Symfony
Docker
Sentry
Kubernetes
ElasticSearch
Neo4j
CouchDB
Rust
Nginx
Linux
MongoDB
ClickHouse
Ethers.js
web3.js
Ready to start
ASAP
Direct hire
Potentially possible

Experience Highlights

Tech Lead and Full-stack Developer
Jul 2021 - Feb 20231 year 7 months
Project Overview

The platform reveals the Influencers who have already bought from stores. To better understand the relationship with a specific customer, each has a profile where you can see their history and some basic stats (orders, average order value, total revenue, etc.). It enables the shop owner or marketing director to contact the influencers for collaboration purposes directly. The app automates the discount code generation with different options, depending on the use case, and presets for multiple approaches. It also emphasizes their power in social media by showing their stats (engagement rate, reach, estimated fees, etc.).

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Led internal team and external team who worked with another legacy app;
  • Built the architecture of the entire application;
  • Developed dashboard service (Symfony + MySQL + Redis);
  • Developed discovery microservice (Go + MySQL + Redis);
  • Setup Docker local environment for development;
  • Setup deployment procedure;
  • Developed a distributed synchronization solution for parallel computing of multiple data streams;
  • Delivered continuous improvement of parallelism and concurrent data processing;
  • Researched and implemented proxy rotating solutions taking care of costs, reliability, and performance;
  • Researched and implemented clustering solutions for Instagram profiles location approximation;
  • Implemented a scoring mechanism for the proper match between a customer and social media account and tweaking for removing false-positive matches;
  • Managed Shopify integration (data import, discount code generator, etc.);
  • Managed reverse engineering Instagram API;
  • Delivered sentry integration for monitoring and alerts;
  • Investigated questions for client interviews;
  • Found features for Product-Market Fit.
Project Tech stack:
Golang
PHP
Redis
Docker
MySQL
Sentry
Symfony
Blockchain Developer
Dec 2021 - Nov 202210 months
Project Overview

It is a Web3 "fit to earn" lifestyle ecosystem that delivers an online concept through a semi-decentralized app, which includes fitness, nutrition, personal development, and mindfulness, that will further develop in a hybrid concept with offline sports events, boot camps, and competitions. It is built on the Elrond blockchain with game-fi elements that have the goal of helping people to become better versions of themselves and get rewarded while achieving their goals.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Developed staking contract;
  • Developed vesting contract;
  • Managed to develop NFT and fragmented NFT for Gyms;
  • Created blockchain architecture and shared knowledge with teammates.
Project Tech stack:
Solidity
Rust
Golang
Founder
Apr 2021 - Apr 20221 year
Project Overview

In the fast-evolving world of digital currencies, the ability to accept multiple cryptocurrencies has become increasingly important. To address this need, Razvan has created a minimal yet effective solution that enables viewers of live streamers to donate using various cryptocurrencies.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Developed front-end (Bootstrap + web3.js + Wallet connect);
  • Researched and developed solutions for OBS integration like real-time data sending (WebSockets);
  • Researched and developed solutions for blockchain integration;
  • Created Ethereum/Polygon/BSC on-chain data store + off-chain local data;
  • Setup deployment.
Project Tech stack:
Solidity
web3.js
Ethereum
Golang
Blockchain
Ethers.js
Founder
Dec 2021 - Mar 20222 months
Project Overview

It is a front-running bot for decentralized exchanges (Pancakeswap, Uniswap), which gets the pending transactions from a low-latency node, and signing and submits a new transaction with a higher tx fee, therefore getting prioritized. It benefits from getting a better rate for trading some coins based on volatility, liquidity pool size, and other aspects.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Researched and reversed engineering blockchain for better understanding;
  • Developed a simple solution for frontrunning other wallets;
  • Re-iterating for optimizations and higher reliability;
  • Integrated with a low-latency node to watch the mempool for pending transactions.
Project Tech stack:
Solidity
Golang
Senior Back-end Developer
Mar 2021 - Jul 20214 months
Project Overview

It is one of the largest e-commerce platforms in Eastern Europe. The main AI recommender system was processing vast amounts of data triggered by various customer events on the platform's website, such as adding or removing products from their cart or wishlist.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Rewrote Python consumers to Go;
  • Redesigned the pipeline;
  • Maintained API documentation in Swagger;
  • Participated in code reviews and contributes to the overall code health;
  • Worked using multithread programming;
  • Used Neo4J for graph database;
  • Developed using event-driven design.
Project Tech stack:
Golang
CouchDB
Redis
ElasticSearch
Neo4j
Kubernetes
Docker
Co-founder
Apr 2020 - Jul 20211 year 3 months
Project Overview

It is an analytics platform for Social Media. The primary differentiator is the ability to track campaigns, therefore having stats to conclude about the quality of the influencer's audience, return on investment, etc. The most important idea was the ability to track each post's statistics (engagement, reach, etc.) and also e-commerce URL tracking (sales, clicks). The main features are a real-time analytics system, public-sharing for collaborations, a co-working system, ROI tracking, etc.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Developed platform (Symfony + PHP + MySQL + Redis);
  • Setup Docker local environment for development;
  • Helped in creating a strategy for SaaS marketing;
  • Managed clients interviews;
  • Helped in competitor analysis;
  • Did a Facebook and Instagram API integration.
Project Tech stack:
PHP
Redis
MySQL
Docker
Nginx
Linux
Golang
Back-end Developer
Mar 2019 - Mar 20212 years
Project Overview

It is a business intelligence application for stores, highlighting insights about the most valuable customers and actions that must be taken. Explore is a CRO (conversion rate optimization) platform. It allows the creation of different variations of the website serving them to multiple segmentation of visitors (A/B testing, advanced segmentation, etc.).

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Developed the Dashboard app;
  • Created the core microservice for data processing;
  • Researched for concurrent and parallel processing;
  • Researched and prepared Clickhouse environment, mainly for sharding and replication, because of high RPS;
  • Developed ETL (MySQL -> Clickhouse);
  • Rewrote queries (MySQL -> Clickhouse);
  • Optimized queries and microservice for big data.
Project Tech stack:
Golang
PHP
Redis
MySQL
Docker
Nginx
ClickHouse
MongoDB

Education

2019
Computer Science
Bachelor's Degree
2021
Master's Degree
Internet Systems Engineering

Copyright © 2024 lemon.io. All rights reserved.