Anatolii

Anatolii Halas
LinkedIn | [open contact info](look above in the "contact info" section) | my website | [open contact info](look above in the "contact info" section) | GitHub

Skills __________

• JavaScript | ECMAScript | AJAX | TypeScript | Node.JS | Deno | Bun.js | jQuery
• HTML | CSS | Sass | LESS | CSS Preproccessors | Bootstrap | TailwindCSS
• React | Redux | Zustand | Redux Toolkit | React Native | Next.js
• Vue | Vue 3 | Vuex | Pinia | Nuxt
• Gsap | Framer Motion | Three.js | Core.js | ClickUp
• Webpack | Esbuild | Vite | Eslint | Nginx
• Nest.js | Express | Python | Django | DRF | PHP | Laravel
• REST | REST API | Websockets | gRPC | GraphQL
• NoSQL | MongoDB | Redis | SQL | MySQL | PostgreSQL | Kafka | RabbitMQ | Elasticsearch
• Microservices | AWS | GCP | Mocha | Jest | Vitest | Unit Testing | OOP
• Git | CI/CD | Github Actions | Docker | Docker Compose | Linux | Frontend | Backend | Full-Stack

• Figma | Adobe PS
• Agile | Scrum | SOLID
• Team Work | PIxel Perfect | Attentiveness | Trainability

• English, Russian, Ukrainian – fluent

Experience __________

Full Stack Developer Sigma Software 09/2021 - present
Key Responsibilities:

● Developed dynamic and high-performance web applications using JavaScript, ECMAScript, TypeScript, and modern frameworks such as React,
Vue, Next.js, and Nuxt, ensuring seamless user experiences and high performance.

● Architected and maintained complex state management solutions using Redux, Redux Toolkit, Zustand, Vuex, and Pinia, resulting in efficient
state handling and a 35% increase in application stability and speed.

● Created mobile applications leveraging React Native to provide cross-platform compatibility, increasing client app usage by 25% due to
enhanced user engagement and smooth interfaces.

● Implemented advanced animations and interactive UI components with GSAP, Framer Motion, and Three.js, boosting user engagement by 20%
through improved visual appeal and interactivity.

● Crafted responsive, visually appealing, and accessible UIs using HTML, CSS, Sass, LESS, CSS preprocessors, Bootstrap, and TailwindCSS,
leading to a 15% decrease in bounce rates and better user retention.

● Developed robust backend services and APIs with Node.js, Deno, Bun.js, Nest.js, Express, and PHP (Laravel), achieving a 40% reduction in
system latency and supporting high-traffic environments.

● Integrated microservices architectures on AWS and GCP, which enhanced scalability, reduced downtime by 30%, and contributed to a 50%
improvement in system reliability.

● Managed and optimized relational and non-relational databases using SQL, MySQL, PostgreSQL, MongoDB, Redis, Elasticsearch, and
messaging queues like Kafka and RabbitMQ to support data-intensive applications, leading to a 25% faster data retrieval time.

● Implemented RESTful APIs, GraphQL endpoints, and WebSockets to enable real-time and efficient data communication, increasing data
throughput by 40%.

● Utilized Webpack, Esbuild, Vite, and Nginx for efficient code bundling, server configuration, and performance optimization, reducing build times
by 30% and improving overall development efficiency.
 ● Ensured high code quality and reliability through unit and integration testing using Mocha, Jest, and Vitest, resulting in a 20% reduction in
post-release defects and increased client trust.

● Employed CI/CD practices using Github Actions and containerization with Docker and Docker Compose, automating deployment pipelines,
which decreased release cycle time by 40% and reduced manual errors.

● Leveraged Git for version control, and collaborated in Agile/Scrum environments using ClickUp, ensuring smooth project workflows and
adherence to best practices, including SOLID principles and OOP methodologies.

● Configured and deployed scalable applications with Linux-based servers and monitored deployments for reliability and efficiency, leading to
99.9% uptime.

Key Achievements:

● Led the migration of legacy systems to modern, efficient stacks, achieving a 40% reduction in load times, which contributed to a 15% revenue
increase for client projects due to improved user experience.
● Championed the adoption of a microservices architecture that reduced downtime by 30%, improved scalability, and supported a 50% increase in
concurrent users.
● Boosted user experience by implementing asset optimization and lazy loading strategies, resulting in a 50% improvement in page load speeds
and a 20% increase in user engagement.
● Reduced technical debt by 25% through comprehensive code reviews and adherence to best practices, leading to a 10% reduction in
development costs and faster project turnaround.

Education __________
Master of Science TNPU Ternopil, Ukraine 10/2022 - 01/2024
• Major in Computer Science and Computer Science mentoring

Bachelor of Science TNPU Ternopil, Ukraine 09/2018 - 06/2022
• Major in Computer Science and Computer Science mentoring