Highly accomplished Back-end Lead Developer with over 6 years of experience, including 3 years as a Lead Developer on a large-scale project. I specialize in designing, developing, and optimizing scalable, high-performance microservices architectures, overseeing architectural decisions, and driving technical initiatives for projects with 30+ microservices. A results-driven and detail-oriented professional, I am a proactive problem-solver, committed to continuous learning, and excel as a natural leader and collaborative team player in building innovative solutions from the ground up.
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Global Cloud Team - (NDA), Ukraine | Apr 2021 – Present
Industry: Sales | Project Type: Customer data source + CRM | Team Size: Up to 40 people
Click to expand/collapseSpearheaded the development and architectural design of a sophisticated sales automation platform comprising 30+ microservices, each optimized for varying load levels and automatic scaling.
Played a pivotal role in planning and implementing key technical solutions for a comprehensive platform featuring lead management, data export, sales automation, queue services, campaign management, automated sales funnels, smart dialing, SMS, native mailing system, AI responses, payment processing, and intelligent analytics.
Key Technologies: NestJS, Node.js, TypeScript, JavaScript, Ruby, K8s, Jenkins, Grafana, Docker, PostgreSQL, MongoDB, Redis, OpenSearch, Microservices, AWS (extensive suite).
Soft Skills: Business Communication, Problem-Solving, Team Collaboration, Leadership, Proactiveness.
DevEducation | Oct 2021 - Apr 2022 | Dnipro, Ukraine
Click to expand/collapseLed a 7-month course covering Base JavaScript/TypeScript and Back-end Specialization.
Covered Key Technologies: Typescript, Mongoose ODM, Node.js, PostgreSQL, NestJS, SQL, MongoDB.
Global Cloud Team - (NDA), Ukraine | Jan 2021 – Apr 2021
Industry: Trading | Project Type: Trading social platform | Team Size: 6 members
Click to expand/collapseSuccessfully migrated legacy Ruby functionality to NestJS, integrating with MetaTrader 4.
Accelerated platform performance by 3.5x through comprehensive code optimization, strategic indexing, and fine-tuning of SQL queries.
Key Technologies: NestJS, Redis, TypeScript, Docker, Linux, PostgreSQL.
Global Cloud Team - (NDA), Ukraine | Sep 2020 – Feb 2021
Industry: Service | Project Type: Polygraph analytic tool | Team Size: 6 members
Click to expand/collapseLed the project from inception, actively collaborating with clients on idea conceptualization and implementation strategies.
Designed and built a comprehensive platform for polygraph examiners, enabling creation and management of reports, security schemes, and graphs.
Implemented automated risk level detection and automatic scheduling of polygraph tests and personnel.
Integrated with external monitoring systems (e.g., YouControl) to generate extensive reports with detailed diagrams.
Key Technologies: NestJS, Redis, TypeScript, Jenkins, Docker, Linux, PostgreSQL.
Global Cloud Team - (NDA), Ukraine | Jun 2019 – Sep 2020
Industry: Blockchain | Project Type: Social network/Marketplace | Team Size: Up to 12 people
Click to expand/collapseDeveloped and implemented core logic on top of the Hive blockchain.
Pioneered the implementation of personalized L2 website generation based on blockchain technology and integrated internal monetization mechanisms.
Developed a review monetization system, enabling users to earn cryptocurrency for various activities through weighted voting.
Significantly optimized blockchain interaction and drastically improved database interaction efficiency.
Deployed and managed a Blockchain Node for block signing, ensuring robust system operation.
Key Technologies: Node.js, Blockchain, MongoDB, Redis, JavaScript, Jenkins, Docker, pm2, Linux, PostgreSQL.
Soft Skills: Business Communication, Problem-Solving, Team Collaboration.
Bachelor of Engineering
Prydniprovska State Academy of Civil Engineering and Architecture (PSACEA)
Dnipro, Ukraine | 2010 – 2015
Engineering Course
DevEducation
Dnipro, Ukraine | Jan 2019 – Jun 2019
Feel free to reach out for collaborations or any inquiries.
Email: contact@olehtsyhulov.tech
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LinkedIn: linkedin.com/in/oleh-tsyhulov-90b39b1a0
Location: Dnipro, Ukraine
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