Upstaff Developer Profile Directory

All vetted software engineers you need to build AI, Web3, and data Products.
  • Dedicated Full-time commitment for long-term or Time& Material for shorter or ongoing support
  • Europe, Israel, LatAm, United States, Asia geography coverage
  • Remote and hybrid engagement
  • Trial period, no termination fees or hidden costs for transparent and risk-free onboarding.
React 8yr.
TypeScript 8yr.
Python 8yr.
Ext JS 5yr.
...
  • Senior Full-Stack Engineer with 10+ years of experience delivering enterprise-grade web applications using React, Next.js, TypeScript, Python, and cloud-native technologies.
  • Expertise in designing and integrating REST APIs, backend services with Django REST Framework and FastAPI, and optimizing frontend performance with reusable components and advanced state management.
  • Proficient in containerization and orchestration using Docker and Kubernetes, with hands-on experience in AWS-hosted CI/CD pipelines and GitHub Actions for stable, efficient releases.
  • Strong background in agile software development, technical documentation, and client collaboration to translate complex business requirements into scalable technical solutions.
  • Holds a Bachelor of Computer Science degree and completed advanced training in React, Redux, and Python design patterns, ensuring up-to-date engineering practices and design principles.
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Senior
Serbia and Montenegro
Ruby
Ruby on Rails
...
  • 15+ years of professional experience in software engineering, including 10+ years specializing in Ruby on Rails.
  • Skilled in Ruby, Ruby on Rails, JavaScript/TypeScript, React JS, Angular JS, and RESTful API design, cloud platforms (AWS, Azure, GCP) and containerization (Docker, Vagrant).
  • Experience in software architecture, design patterns, UML, MVC, TDD, BDD, and Agile methodologies (Scrum, Kanban, XP), SDLC.
  • Leadership in large-scale projects including telemedicine, legal services, and e-commerce platforms, driving architecture, team coaching, and performance optimization (Elasticsearch, Sidekiq), and advanced database technologies (MySQL, PostgreSQL, MongoDB).
  • Skilled in memory optimization, big data processing, API integration, code refactoring, and comprehensive documentation, delivering scalable and maintainable solutions across diverse domains.

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JavaScript 2yr.
TypeScript 2yr.
React 2yr.
Node.js 2yr.
...
  • Senior Software Engineer with 10+ years of expertise in scalable web applications and distributed systems using JavaScript, TypeScript, React.js, Node.js, and Python.
  • Proven leadership in transitioning to event-sourcing architectures, achieving 39× faster read query performance and enhancing system scalability.
  • Extensive experience in microservices, REST API development, and database optimization with MongoDB and PostgreSQL for high-performance applications.
  • Skilled in integrating AI-powered development tools like Claude Code and Cursor IDE to boost engineering productivity and innovation.
  • Strong background in full software development lifecycle, team mentoring, and delivering complex solutions across diverse domains including industrial monitoring, telecommunication, and asset trading.
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Senior
Ukraine
Ruby
Ruby on Rails
SQL
MongoDB
PostgreSQL
...
  • 12+ years of professional experience specializing in Ruby on Rails development, DevOps engineering, and team leadership.
  • Skilled in Ruby, Rails, SQL, MongoDB, Terraform, Docker, AWS, and Hetzner.
  • Ability to optimize backend logic, database queries, and application performance, including resolving complex memory leaks and enhancing system reliability.
  • Skilled in integrating frontend technologies such as ReactJS and CoffeeScript, and implementing CI/CD pipelines, infrastructure as code, and containerization.
  • Experienced in leading teams, coordinating workloads, mentoring developers, and managing client requirements to deliver high-quality software solutions.

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Senior
Ukraine
PHP 4yr.
MySQL 4yr.
Redis 4yr.
Laravel 2yr.
...
  • Software engineer with 4+ years of experience specializing in backend development using PHP, Laravel, Phalcon, and Symfony, delivering optimized web applications and scalable APIs.
  • Proficient in database design and management with MySQL, Redis, and Elasticsearch, alongside expertise in queue processing and performance optimization.
  • Skilled in cloud infrastructure and DevOps tools including Docker, AWS (EC2, S3, CloudWatch), Azure, Nginx, Linux, and CI/CD pipelines to ensure robust deployment workflows.
  • Strong foundation in computer science with a Bachelor's degree, covering algorithms, data structures, design patterns, OOP, SOLID principles, and multiple programming paradigms.
  • Experience mentoring developers and integrating complex APIs, with additional knowledge in C++, JavaScript, and machine learning concepts, contributing to diverse project success.
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.NET Core
ASP.NET Core Framework
Azure
...
  • Software Engineer with 5+ years of experience in .NET Core, C#, ASP.NET Core, and TypeScript.
  • Experienced in cloud and integration development (Azure Functions, Logic Apps), and AWS, with a focus on event-driven and distributed systems (RabbitMQ, Redis, Hangfire).
  • Skilled in designing integration workflows, data transformation pipelines, and solutions aligned with iPaaS and ETL principles.
  • Experience in modernizing legacy systems and migrating to cloud-native, microservices, and API-led architectures.
  • Skilled in REST, gRPC, and database design (PostgreSQL, MSSQL, MongoDB), along with CI/CD and testing.

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Senior
Poland
TypeScript
Node.js
React
...
  • Senior Full Stack Engineer with 5+ years of experience developing web and mobile applications;
  • Implemented APIs and microservices with Node.js, Nest.js, PostgreSQL, including caching, queue management, and AWS infrastructure (Proxet, NovaPay, and Web3 Startup);
  • Built interfaces and component libraries using React, Vue, React Native, Next.js, TypeScript, and JavaScript (Proxet (SSR web platform), NovaPay (mobile app), and Web3 Dashboard);
  • Experienced in fintech, Web3, and enterprise platforms, delivering production features, maintaining existing systems, and working in Agile teams.

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Senior
Warsaw, Poland
Python 10yr.
PyTorch 6yr.
TensorFlow 6yr.
Kubernetes 4yr.
LangChain 1yr.
...
  • Senior Machine Learning Engineer with 10+ years architecting scalable AI systems, specializing in deep learning, LLM orchestration, and MLOps across AWS, Azure, and Databricks.
  • Expertise in Python, C++, Java, Rust, and Go, with advanced skills in PyTorch, TensorFlow, LangChain, Kubernetes, and distributed computing frameworks.
  • Proven track record delivering enterprise-grade AI products including multi-agent LangGraph pipelines, real-time voice tutoring platforms, and decentralized ML infrastructure.
  • Strong background in computer vision, NLP, and autonomous systems, with hands-on experience in YOLO, OpenCV, CUDA, and GPU optimization.
  • Master’s degree in Computer Science, skilled in CI/CD, containerization, microservices, and compliance-driven software development for high-impact AI applications.
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Architect/Team-lead
United States
Python 9yr.
JavaScript 8yr.
Django REST framework 6yr.
Flask 6yr.
AngularJS 6yr.
...
  • Over 11 years of experience in backend and full-stack development with expertise in Python (Django, Flask, FastAPI) and JavaScript frameworks (Angular, Vue.js, React).
  • Proficient in designing scalable microservices and monolithic architectures, optimizing API performance (e.g., reducing heavy request times from minutes to under 1 second).
  • Strong skills in DevOps and cloud infrastructure including AWS, Docker, Jenkins CI/CD, and infrastructure automation with Ansible.
  • Hands-on experience with databases (PostgreSQL, MySQL, ClickHouse, Neo4j), caching, messaging systems (Kafka, Redis), and search technologies (Elasticsearch, Solr).
  • Computer Science education with a Bachelor’s degree in Automated Systems of Information Processing; led teams and delivered complex features improving system responsiveness and client satisfaction.

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C/C++/C#
Java
Kotlin
PHP
...
  • Undergraduate in BSc Software Engineering at Cardiff Metropolitan University with hands-on experience in full stack web and API development.
  • Proficient in C#, Java, PHP, ASP.NET Core, Entity Framework Core, React, and mobile development using Java/Kotlin and Android Studio.
  • Developed multiple real-world projects including e-commerce platforms, veterinary management systems, and freelance service marketplaces using SQL Server, MySQL, and SQLite databases.
  • Skilled in building responsive, user-friendly web applications and backend APIs following modern software development practices and version control with Git.
  • Experience in end-to-end software development lifecycle, from requirement analysis to deployment, demonstrated through academic and freelance projects.
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Python 6yr.
Django REST framework 2yr.
Flask 2yr.
JavaScript
FastAPI
...
  • Senior Backend Engineer with 7+ years of expertise in designing and deploying scalable, secure backend systems and AI-powered platforms using Python, Django, Flask, and FastAPI.
  • Proficient in integrating databases (MySQL, PostgreSQL, MongoDB) with ORM tools like Django ORM and SQLAlchemy, and experienced in cloud-native architectures across AWS, Azure, and GCP.
  • Hands-on experience in AI/ML, LLM inference, Agentic RAG pipelines, and productionizing intelligent systems for real-time, high-traffic consumer applications.
  • Strong engineering background with a Master’s in Computer Application and top academic performance, complemented by leadership roles mentoring development teams and managing end-to-end project delivery.
  • Skilled in distributed systems, API development, automation, cybersecurity best practices, and modern software development methodologies ensuring system stability and performance.
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Python 8yr.
TensorFlow 8yr.
PyTorch 8yr.
SciPy 8yr.
PostgreSQL 2yr.
...
  • AI/ML Engineer with 8+ years leading projects in computer vision, NLP, and predictive modeling, leveraging Python, C++, and cloud platforms (AWS, Azure, GCP).
  • Expertise in designing scalable ML pipelines, time series forecasting, and real-time data processing using TensorFlow, PyTorch, Spark, and MLflow.
  • Proven track record managing teams and delivering AI-driven solutions including automated lead generation, chatbot systems, and image-based product classification.
  • Strong background in applied mathematics with Master’s degree, skilled in advanced algorithms, ensemble methods, and deep learning architectures (CNNs, Transformers, GNNs).
  • Hands-on experience with databases (MySQL, PostgreSQL), containerization (Docker), and cloud-native services for end-to-end ML lifecycle management.
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Architect/Team-lead
Ukraine
React 5yr.
TypeScript 5yr.
Ext JS 3yr.
...
  • Senior Frontend Engineer with 6+ years of expertise in React.js, Next.js, TypeScript, and modern frontend architectures, delivering high-performance trading interfaces and blockchain-enabled applications.
  • Proficient in state management (Redux Toolkit, MobX), UI frameworks (Tailwind CSS, Material UI), and Web3 integrations including wallet connections and smart contract interactions.
  • Led development of scalable crypto exchange platforms with real-time data processing, multi-currency wallet management, and KYC/AML compliance workflows.
  • Experienced in Agile methodologies, CI/CD pipelines, and test-driven development using Jest, React Testing Library, and Cypress to ensure robust, maintainable codebases.
  • Holds a Bachelor's degree in Information Technologies, with strong skills in backend (Node.js, NestJS), databases (MongoDB, PostgreSQL), and cloud DevOps (Docker, AWS, Azure).
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UI/UX
...

Palm Infotech is a leading Software and App Development Company offering tailor-made mobile and web solutions for startups, SMEs, and enterprises. We specialize in Android, iOS, NodeJS, React Js, Fluter and cross-platform apps with ERP integration, and are known for building high-performance products like fantasy sports apps, astrology-based platforms, food and grocery delivery apps, taxi booking systems, clinic management tools, and other on-demand applications. From MVP implementation to robust order management systems, our team focuses on scalable, intuitive, and AI-powered apps that align with business goals. With expertise in UI/UX, backend architecture, and third-party integration, we deliver end-to-end development along with ongoing maintenance and post-launch support. Palm Infotech is trusted for its timely delivery, responsive communication, and quality-driven development across industries.

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Senior
Aldie, United States
JavaScript 5yr.
TypeScript 5yr.
Node.js 5yr.
Go 3yr.
NestJS 1yr.
...
  • Software engineer with 7+ years of experience specializing in full-stack development using JavaScript/TypeScript, C#, Go, and Python across macOS, Unix, and Linux environments.
  • Proven expertise in architecting scalable microservices, event-driven systems, and cloud-native applications leveraging AWS, Azure, GCP, Kubernetes, Docker, and CI/CD pipelines.
  • Strong background in designing and optimizing databases (PostgreSQL, MongoDB, Cassandra, Neo4j) and implementing high-performance caching and real-time data streaming solutions with Kafka and Redis.
  • Skilled in modern frameworks and tools including Node.js, Nest.js, React, Django, and Spring, with hands-on experience in OAuth 2.0, JWT security, and compliance with ISO 27001 and GDPR.
  • Computer Science degree with demonstrated success in improving system performance by up to 40%, automating workflows, and leading migrations from monolithic to microservices architectures.
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Python
C++
Scala
Apache Airflow
...
  • 15+ years of experience in IT;
  • Strong knowledge in Mathematics and physics (over 30 scientific publications);
  • Data Engineering and Data Architecture Experience
  • System-level programming, OOP and OOD, functional programming;
  • Profiling and optimizing code; Writing reliable code; Writing product documentation, supporting products;
  • Team working, team leading; Mentoring skills as a senior developer;

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Senior
Ternopil, Ukraine
Python 6yr.
SQL 6yr.
Apache Airflow
Apache Spark
AWS
...
  • Experienced Data Engineer and BI Developer with 6+ years of expertise in Database Design and Business Intelligence Development.
  • Proficient in cloud technologies such as Amazon Web Services (AWS), Google Cloud Platform, and Microsoft Azure.
  • Skilled in building high-performance data integration and workflow solutions, including ETL operations for data warehousing and supporting OLAP, OLTP, and Data warehouse systems. Experience in optimizing DWH performance and automating data pipelines;
  • Modern data engineer skills such as data modeling, data warehousing, data lake, data governance, and data quality.
  • Experience with big data technologies such as Hadoop, Spark, and Kafka, and experience with data streaming and real-time data processing.
  • Proficiency in SQL and NoSQL databases, Snowflake, and ClickHouse
  • Data visualization tools such as Tableau or Power BI.
  • Programming languages such as Python, Java, or Scala, and understanding of machine learning concepts, with experience building and deploying machine learning models.
  • Experience with CI/CD, data governance, and security best practices.
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Senior
Tashkent, Uzbekistan
React 2yr.
Facebook Auth 1yr.
Java 1yr.
...
  • Front-End Developer with expertise in React.js and Flutter, delivering responsive, high-performance web and cross-platform mobile applications.
  • Proficient in translating UI/UX designs into scalable, pixel-perfect interfaces, with strong skills in component-based architecture and performance optimization.
  • Experience in Agile methodologies, collaborating with cross-functional teams to deploy digital solutions and enhance user engagement.
  • Background in Agricultural & Bio-environmental Engineering with additional certifications in Business Strategy, CRM, HR, and Project Management.
  • Hands-on knowledge of blockchain technology and decentralized platforms, complemented by full-stack development experience using Java and Asp.Net.
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Node.js 4yr.
TypeScript 3yr.
MondoDB 3yr.
DI 2yr.
...
  • Proficient in TypeScript and Node.js with hands-on experience in building scalable backend systems and real-time integrations using Bun runtime.
  • Developed a multi-account Discord-to-Telegram message bridge featuring modular dependency injection, GPT-4o-mini translation, advanced content filtering, and robust proxy/captcha handling with MongoDB persistence.
  • Skilled in Telegram bot development using Telegraf and node-canvas, implementing multiplayer game logic and dynamic graphical rendering.
  • Experienced with REST APIs, WebSockets, OpenAI API integrations, and complex asynchronous workflows emphasizing clean, maintainable code architecture.
  • Self-taught with a strong focus on practical software engineering principles, modular design patterns, and delivering client-ready solutions under tight deadlines.
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Junior
Russia
Ruby 13yr.
Ruby on Rails 13yr.
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- Experienced full-stack web developer and team lead with a solid knowledge of strategies, patterns, and technologies. - Proven experience and expertise in building and maintaining full-stack applications, adept at both backend and frontend development using technologies such as Ruby on Rails, Elixir, Phoenix, JavaScript, React.js, and Go. - Proficient in configuring cloud architectures using AWS CDK scripts and deploying applications to cloud services such as AWS and GCP - Extensive background in backend API development, including building messaging platforms, digital contracts signing platforms, and social network MVPs using technologies like Elixir, Phoenix, and GraphQL API. - Strong database architecting and management expertise, with hands-on experience in PostgreSQL, Redis, and other database technologies, contributing to efficient data storage and retrieval. - Demonstrated leadership as a CTO, leading teams, setting strategic goals, managing team dynamics - Upper-Intermediate English
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Senior
Vinnitsa, Ukraine
Java
...
- Full-Stack Developer with experience in various projects, including military weapon maintenance, truck analytics, app store launch, social benefits management, ISP monitoring, and router web interface. - Over 6 years of experience and a solid background in object-oriented analysis and design, comprehensive knowledge of system development life cycle, physical and logical data modeling, performance tuning, and enterprise-level system development. - Led a team responsible for data migration to the cloud, enabling server-to-cloud data synchronization and strengthening software security. - Upper-Intermediate English
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Senior
Zaporizhzhya, Ukraine
Ruby on Rails
PostgreSQL
React
Elasticsearch
Angular
...
14 years of professional expertise in IT industry; 12+ years using Ruby on Rails framework and Rails ecosystem; 4+ years using JavaScript; (Angular JS, React JS, Backbone Js, Vue Js, Vanila Js) Rich experience in Web development using JQuery, CSS, HTML, Bootstrap, 3 less); Experience in databases: PostgreSQL, Mongo DB; Agile CRM
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Senior
Cherkasy, Ukraine
Java
API
TypeScript
Angular
JavaFX
...
An adept Full Stack Software Developer with over 14 years of comprehensive experience in IT, specializing in Java and Continuous Integration/Continuous Delivery (CI/CD) practices. Technically proficient in developing RESTful APIs, tailoring frontend libraries with Angular and TypeScript, and securing applications with Spring Security. Proven history of leveraging agile methodologies to advance software development life cycle (SDLC) processes in international projects, focusing on industries like gaming and traffic control. Passionate about knowledge sharing, evidenced by contribution to a Java newsletter and mentoring roles. This engineer's history showcases a solid foundation in electrical engineering technologies and a consistent drive for enhancing software manufacturing through innovation and rigorous quality assurance.
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Ruby
JavaScript
...
7+ years of web development experience, during last 4 years I have been dedicated to RoR.
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React
Node.js
...
- 5+ years of professional experience using front-end and back-end technologies - Solid experience in building rich web applications (monolith and MSA) using frameworks and libraries such as React, NestJs, Express - Most of the development experience was gained in projects related to business corporate networks, coaching platforms, insurance, fintech, leasing, and event-management systems - Front-end: JavaScript(ES6), React, Redux, Next.js, Redux-saga, Context API, React Hooks, Chartjs, HTML, CSS(SCSS), MaterialUI, AntDesign, Tensorflow - Back-end: NodeJS (Express, NestJS), REST API, Docker, Terraform - Upper-Intermediate English
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Middle
Slovakia
Laravel
...
- Sauvik Kundu is a Senior Software Engineer with 6+ years of experience in backend development. - He has expertise in PHP, Laravel, MySQL, and Web Services API. - Sauvik has worked on projects related to Management, SaaS-based, CRM, ERP, E-commerce, and Chat apps. - He has experience in optimizing project queries and integrating various APIs and tools. - Sauvik has a strong understanding of Agile methodologies and Test Driven Development. - He has a Master's degree in Computer Science and Engineering from BRAC University. - Sauvik is passionate about product growth and user-centric design, and aims to work in dynamic, product-focused companies.
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Senior
Bangladesh
React Native
...
- Senior Software Engineer with 6 years of experience in the IT industry, 5+ of them at cross-platform mobile development. - Mostly works with React and React Native. - He does his best to keep up with modern practices and modern technologies, that way he can offer clients the most up to date solutions that give the users of their application the best experience. - Team player and flexible in the working environment. - Responsible Engineer willing to grow professionally and create new effective solutions for business. - Upper-Intermediate English.
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Senior
Ukraine
Java
Angular
...
- Java lead developer with 11+ years of complete circle engineering, development teams management, and architecture design. - Full-Stack Development Proficiency covering frontend technologies like AngularJS, Angular 11, ReactJS, and backend technologies including Java 8-14, Spring Boot, Hibernate, and more. - Proven Expertise in architecture design, system migration, and refactoring, enhancing performance and maintainability. - Specialized in RESTful APIs, designing, implementing, and optimizing high-performance APIs to facilitate seamless integration. - Successful Project Delivery, including Internet banking systems, contract management platforms, legal aid services, and ISP monitoring systems. - Strong Database Management Skills, with experience in PostgreSQL, OracleDB, HBase, Hadoop, and MongoDB. - 7+ years of experience as a Lead Engineer, leading teams of 10+ developers - 5+ years of experience as an Architect - Upper-intermediate English
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Senior
Zaporizhzhya, Ukraine
Java
React
...
- Results-oriented Java and JavaScript software engineer with 5+ years of experience developing, testing, and maintaining enterprise software solutions. - Developed and maintained a bunch of advanced projects from use cases and functional requirements. - Good team player, quick learner, motivated and detail-oriented. - Upper-intermediate English - Available ASAP
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Java 5yr.
React 2yr.
...
- Full-Stack Software Engineer with 5 years of development experience - Experience in AWS and messaging frameworks like Kafka and Spring Integration - Reworked applications to meet changing market trends and individual customer demands - Designed, developed, and implemented software applications for websites based on analyzed requirements and understanding of industry technical standards - Reviewed code and debugged errors to improve performance - Collaborated in a team-based, Agile environment to accomplish objectives by deadlines - Versed in the latest technologies and most useful programming languages - Fluent English - Available in 1-2 weeks after approval for the project
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C/C++/C#
Python
Java
HTML
CSS
...
I'm a second-year Computer Science student at Nanyang Technological University with a passion for full-stack development and cloud engineer , I’m seeking internships to combine my technical expertise and business acumen to drive innovative, tech-driven solutions.
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Intern
Singapore, Singapore
React
JavaScript
Node.js
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- 5 years of experience in IT - My specialties include quickly learning new skills and programming languages, problem-solving, domain-driven design, Micro-service architecture, Rest API, responsive design principles, website optimization, and Model View View Model(MVVM) methods of organizing code. So far I have JavaScript, Python, Java, Typescript, HTML, CSS, ReactJS, Angular, SQL, NoSQL, Jest, Django, Spring boot framework, and Git under my belt. I'm still enthusiastically grabbing onto any other programming languages, frameworks, or principles I can integrate into the coding web in my head - Upper-Intermediate English. - Available ASAP.
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Senior
Addis Ababa, Ethiopia
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