Borislav Yordanov
Verified Expert in Engineering
Full-stack Developer
Varna, Bulgaria
Toptal member since August 24, 2022
Borislav is a highly skilled full-stack developer and a certified AWS and Twilio engineer with extensive experience as a team lead, DevOps engineer, and consultant for large-scale projects. He thrives in all stages of software development, from product analysis to architecting and delivering high-availability solutions. Borislav specializes in cloud computing, real-time communication, scalable distributed systems, and modern web development.
Portfolio
Experience
- JavaScript - 14 years
- Node.js - 7 years
- React - 7 years
- TypeScript - 6 years
- AWS Cloud Architecture - 5 years
- SaaS - 5 years
- Multitenancy - 4 years
- React Native - 3 years
Availability
Preferred Environment
Linux, MacOS, JetBrains, WebStorm, IntelliJ IDEA, iOS, OpenAI GPT-3 API, ChatGPT
The most amazing...
...project I've worked on is medical software that helps medical professionals to diagnose patients early and prevent severe conditions and diseases.
Work Experience
Full-stack Team Lead
Hommz Technologies Ltd
- Spearheaded task definitions from the Product department, aligning development goals with business objectives. Improved sprint velocity by over 20%, ensuring streamlined workflows and timely deliverables.
- Provided hands-on support in task development, debugging, and optimizing the development lifecycle. Reduced issue resolution time, accelerating feature releases.
- Assisted developers with task development, complex issues debugging, and development lifecycle improvements.
- Led the design and execution of DevOps strategies, minimizing deployment man-hours by 99%. Established a fully automated code review CI/CD workflow, improving deployment success rates and reducing manual overhead.
- Played a key role in product discovery and grooming sessions, refining features to align with business needs.
- Built and launched a fully-featured CRM software, increasing operational efficiency and customer engagement.
- Engineered robust video and image processing solutions, enhancing system capabilities and improving media handling performance.
PHP/Twilio Developer
HOME NATION.COM LLC
- Designed and deployed a fully self-managed call center solution, ensuring 100% uptime, leading to uninterrupted customer support operations.
- Increased answered incoming calls by over 25% within five months by optimizing system performance, call routing, and agent workflows.
- Engineered a robust, scalable, and bug-free call center solution, maintaining zero critical defects for over two months, ensuring seamless operations and minimal technical disruptions.
Twilio Expert
Nuance Languages, LLC
- Registered for a A2P 10DLC campaign with Twilio to meet US regulations.
- Reached 100% message deliverability for the configured campaign.
- Improved message quality and delivery standards and applied carrier requirements.
- Investigated the reason for SMS messages not arriving.
Full-stack Developer
Berlin Bytes GmbH
- Designed and launched a high-performance Next.js front-end integrated with a Magento 2 back end, ensuring seamless scalability and optimal performance.
- Built a device-agnostic eCommerce experience, ensuring flawless functionality across all screen sizes, from small mobile phones to 5K desktops, enhancing user engagement and accessibility.
- Architected and optimized GraphQL APIs for efficient data retrieval, reducing response times and improving front-end performance.
- Managed and optimized product, cart, and order workflows within Magento 2, ensuring a seamless and efficient shopping experience, reducing cart abandonment, and improving order processing efficiency.
Senior Full-stack Developer
NFT Guru
- Adapted quickly to rapid business model shifts, contributing to the company's strategic pivot from selling clothing and accessories to NFT commerce, ensuring seamless technological transitions.
- Created an Ethereum-based smart contract, gaining deep expertise in EIP-20 (fungible tokens) and EIP-721 (non-fungible tokens) standards, enabling secure and efficient blockchain transactions.
- Built and optimized decentralized applications using React, GraphQL, Next.js, Azure Cosmos DB, and Cryptouch, delivering scalable and high-performance solutions for Web3 environments.
Technical Team Lead
Scopic Software
- Spearheaded the end-to-end development of an internal real-time communication platform, ensuring seamless collaboration and improving response efficiency across teams.
- Served as the Twilio-certified engineer in a 300+ employee company, providing strategic guidance on Twilio services, optimizing communication workflows, and enhancing platform reliability.
- Joined and revived stalled projects, diagnosing critical issues, implementing solutions, and ensuring on-time project delivery while seamlessly integrating into new teams.
- Partnered with one of Germany’s largest tech companies to develop real-time race-tracking software, improving data accuracy and performance analytics.
- Developed and enhanced mission-critical software solutions for the UK healthcare industry, ensuring compliance with industry regulations and improving operational efficiency.
- Acted as an AWS cloud architecture expert, providing technical consulting to university professors, optimizing cloud-based applications, and enhancing scalability and cost-efficiency.
Senior Software Developer
Scopic Software
- Ascended quickly to team leader within two months in a high-pressure, rapid development project, demonstrating exceptional adaptability and leadership skills.
- Tracked team progress, managed task allocations and estimations, and provided data-driven reports to stakeholders, ensuring project transparency and alignment with business goals.
- Designed and developed a scalable, fault-tolerant chat engine leveraging Amazon ECS, Node.js, and Redis, ensuring minimal latency, high throughput, and uninterrupted real-time messaging.
Lead Full-stack Developer
Dream Studio Ltd
- Contributed to the development of multi-tenant eCommerce SaaS applications with a proven 99.999% uptime, ensuring seamless and reliable operations at scale.
- Built and launched 12+ eCommerce websites, some supporting 10,000+ product catalogs, optimizing performance, search functionality, and transaction processing.
- Identified and re-engineered fragile customer-agent coordination rules, improving operational efficiency and enhancing customer support responsiveness.
- Played a key role across the entire software development lifecycle, from the technical discovery phase to final product delivery, ensuring robust architecture, compliance, and seamless deployment.
Experience
Dreamshop.io
http://dreamshop.ioIt was my first startup project where I acted as the lead developer from the day it started in 2014 until 2018.
Headless B2B Agrar eCommerce Platform
I oversaw the back-end development and GraphQL integration. My work also included the Magento 2 product, cart, and order integration.
Real-time Sail Yacht Tracking and Racing App
Voice Chat and Video Communication Tool
Certifications
AWS Certified Solutions Architect - Associate (SAA)
Amazon Web Services Training and Certification
AWS Certified Developer - Associate (DVA)
Amazon Web Services Training and Certification
AWS Certified Cloud Practitioner (CLF)
Amazon Web Services Training and Certification
Twilio Certified Developer
Twilio
Skills
Libraries/APIs
Node.js, React, REST APIs, jQuery, Vue, Stripe, Stripe API, WebRTC, Facebook API, Google Ads API, Twilio API, Web3.js, Socket.IO, WhatsApp API, OpenAI API
Tools
Amazon Elastic Container Service (ECS), AWS CloudFormation, Amazon ElastiCache, JSX, GitHub, AWS SDK, Amazon Simple Queue Service (SQS), Auth0, NPM, Figma, Stripe Checkout, Git, ChatGPT, AWS Step Functions, Docker Compose, React Apollo, JetBrains, WebStorm, IntelliJ IDEA, Terraform, Twilio Programmable Video, Amazon CloudWatch, Amazon CloudFront CDN, Amazon Cognito, RabbitMQ, Jira, Prisma, Drizzle ORM
Languages
PHP, JavaScript, TypeScript, HTML, CSS, SQL, PHP 5, PHP 7, XML, HTML5, CSS3, GraphQL, Less, SCSS, C++, Java, Rust, Python
Frameworks
React Native, Next.js, Express.js, JSON Web Tokens (JWT), Redux, Symfony, Laravel, Tailwind CSS, Bootstrap, Django, Jest, Material UI, Angular, Electron, NestJS, CodeIgniter, tRPC
Paradigms
REST, Microservices Architecture, Microservices, Application Architecture, DevOps, Mobile Development, Serverless Architecture
Platforms
Twilio, Amazon Web Services (AWS), AWS Lambda, Docker, Amazon EC2, Linux, MacOS, iOS, Vercel, Ably, Kubernetes, Shopify, Android, Magento API, Magento 2, Blockchain, AWS ALB, Azure
Storage
Amazon DynamoDB, NoSQL, Relational Databases, MySQL, PostgreSQL, Databases, JSON, Redis Cache, Redis, Redshift, Elasticsearch, Amazon S3 (AWS S3), Amazon Aurora, Azure Cosmos DB, MongoDB, MariaDB
Other
SaaS, Multitenancy, Full-stack, Content Management Systems (CMS), WebSockets, UI Development, Cloud Infrastructure, APIs, Architecture, Consulting, Mentorship, Web Development, Caching, Session Handling, eCommerce, Marketplaces, Distributed Systems, Back-end, Remote Team Leadership, API Integration, Code Review, Full-stack Development, Technical Leadership, Software Architecture, SMS, Minimum Viable Product (MVP), CI/CD Pipelines, Software Development, Web Security, Real-time Communication (RTC), System Architecture Design, AWS Cloud Architecture, Data Scraping, Front-end, Enterprise Systems, OAuth, Responsive Web Apps, Serverless, CTO, Mobile App Development, Technical Architecture, Leadership, Team Leadership, Cloud Platforms, Estimations, Technical Consulting, Cloud Architecture, System Design, Payment APIs, Messaging, Multimedia, Team Management, Customer Relationship Management (CRM), Large Language Models (LLMs), GitHub Actions, Big Data, VoIP, Medical Software, Wireless Communication, Apollo Server, Web 3.0, Non-fungible Tokens (NFT), Cryptocurrency, Multicast, App Store, Google Play Store, Subscriptions, Subscription Processing, Stripe Subscriptions, Apollo, Amazon RDS, Responsive Design, User Interface (UI), Decentralized Finance (DeFi), Transmission Control Protocol (TCP), UDP, Near-field Communication (NFC), Monorepos, OpenAI GPT-3 API, AWS Certified Cloud Practitioner, AWS Certified Solution Architect, AWS Certified Developer, Startups, Argo CD
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