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.
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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Seniority Senior
Location Vinnitsa, Ukraine
Java
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- 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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Seniority Senior
Location Zaporizhzhya, Ukraine
Ruby on Rails
PostgreSQL
React
Elasticsearch
Angular
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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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Seniority Senior
Location Cherkasy, Ukraine
Java
API
TypeScript
Angular
JavaFX
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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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Seniority Senior
Location Bulgaria
Ruby
JavaScript
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7+ years of web development experience, during last 4 years I have been dedicated to RoR.
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Seniority Senior
Location Ukraine
React
Node.js
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- 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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Seniority Middle
Location Slovakia
Laravel
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- 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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Seniority Senior
Location Bangladesh
React Native
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- 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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Seniority Senior
Location Ukraine
Java
Angular
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- 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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Seniority Senior
Location Zaporizhzhya, Ukraine
Java
React
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- 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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Seniority Senior
Location Ukraine
Java 5yr.
React 2yr.
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- 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
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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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Seniority Intern
Location 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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Seniority Senior
Location Addis Ababa, Ethiopia
React
Node.js
TypeScript
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- 4+ years experience in software development - 3+ years working as Full-stack JS (React+Typescript/Node) developer - Intermediate+ English - Available 12/07/2021
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Seniority Middle
Location Ukraine
Node.js
React
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- 5+ years of professional experience using front-end and back-end technologies - Front-end: Deep knowledge of native JavaScript (basics, OOP, DOM, events, asynchrony, AJAX, event loop), ES6+, React, Redux, other React tools (React-router, Redux-Saga, etc.), HTML5, CSS3, LESS, SASS, Bootstrap, Material-UI. - Back-end: Node.js, Express.js, NestJS, JWT, REST API, GraphQL, Postgres, Sequelize, Typeorm, knex.js, Docker, Microservices. - Upper-Intermediate English - Available in 2 weeks after approval for the project
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Seniority Senior
Location Lviv, Ukraine
PHP 9yr.
Vue.js 5yr.
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- 9+ years of experience in the IT industry as a full-stack developer with great experience in modern web technologies. - Intermediate English - Available ASAP
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Seniority Senior
Location Ukraine
React
Vue.js
React Native
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- 4 years of experience in software development based on frontend technologies. - Front-end developer with expertise in web & mobile application development based React.js/Vue.js, React Native, HTML/CSS. - Experienced in the next stages of the life cycle of development of business applications: planning, estimation, investigation, development, writing tests, support of existing code.
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Seniority Middle
Location Ukraine
JavaScript
React
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- 7+ years IT professional in front-end web development in the field of web-oriented applications for startups, midsize businesses, and large enterprises from various industries. - Expert in React. - Follow React updates. - Good knowledge of TypeScript and JavaScript. Have fully and deep understanding of UX/UI design implementation into HTML layout. - Experienced in different approaches, front-end engineering principles, and concepts. - Knowledge in functional programing, service-based fronted development, OOP based on prototypes, Unit testing (TDD). - Upper-intermediate English - Available ASAP
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Seniority Senior
Location Odesa, Ukraine
Go
Node.js
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- 14+ years of software development. - Experienced software developer with extensive skills in developing high-load multi-component systems featuring diverse languages and technologies. - An expert in the establishment of value-driven processes and cross-functional teams for the successful delivery of innovative products. - Upper-Intermediate English - Available ASAP
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Seniority Senior
Location Ukraine
React
React Native
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- 5+ years of professional background in Web and Mobile Development. - Solid expertise in the development of CRMs, real-time apps, high-load, low-latency systems, Web and Mobile apps, RESTful API, etc. - Initiative in the development of solutions, the last project was highly loaded, was responsible for the architecture and implementation - Upper-Intermediate English - Available ASAP
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Seniority Middle
Location Yerevan, Armenia
Ruby
Ruby on Rails
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- 7+ years of experience as a software developer. - Has experience working on 3 long-term projects with Ruby on Rails for over 3.5 years. In addition, started a career as a PHP developer and worked on 4 long-term and many short-term projects. - Has experience communicating with different teams and taking part in planning, feature creation, refactoring, testing, and deployment. - Upper-Intermediate English - Available ASAP
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Seniority Senior
Location Ukraine
Node.js
React
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- 3+ years of professional experience using front-end and back-end technologies - Front-end: JavaScript(ES6), React, Redux, Redux-saga, Context API, React Hooks, Vue js, Vuex, Angular, HTML, CSS(SCSS), MaterialUI, AntDesign - Back-end: NodeJS (Express, NestJS), REST API, Docker - Solid experience in building rich web applications (monolith and MSA) using frameworks and libraries such as React, NestJs, Express, and Vue js. - Intermediate English - Available in 1 week after approval for the project
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Seniority Middle
Location Schiedam, Netherlands
TypeScript 1yr.
JavaScript
React
HTML
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Accomplished junior web developer with a recent graduation from Telerik Academy and expertise in JavaScript and React, demonstrating both front-end and full-stack capabilities. Strong technical foundation displayed through impactful projects utilizing modern technologies such as Next.js, Tailwind CSS, PostgreSQL, and Firebase. Effective at independent work, as shown by rapid skill acquisition in welding transformed into disciplined software development, with a proven track record of mastering new technologies swiftly. An efficient teamwork contributor, evidenced by the successful collaborative development of complex web applications. Recognized for excellence in both academic achievements and practical application, ready to bring skills to a dynamic team.
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Seniority Junior
Location Sofia, Bulgaria
React 4yr.
Node.js 4yr.
JavaScript
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- 5 years of experience as a Middle React.js Developer - He has experience with web interfaces and react.js and node.js technologies. Experience with PWA on projects, also worked with PHP, C++, C#, and Android development. - Upper-Intermediate English - Available ASAP
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Seniority Middle
Location Poland
JavaScript 4yr.
React 3yr.
Node.js 2yr.
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- 4 years of experience in web development. Skilled in JavaScript and React, TypeScript. - Confident in HTML, CSS, integration with API. - 4 years of experience in programming - Upper-Intermediate English - Available ASAP
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Seniority Middle
Location Lviv, Ukraine
Ruby on Rails 8yr.
React 6yr.
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8 years of professional expertise in IT industry; 8+ years using Ruby on Rails framework and Rails ecosystem; 5+ years using JavaScript; (Angular JS, React JS) Experience in databases: PostgreSQL, Mongo DB;
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Seniority Architect/Team-lead
Location Cherkasy, Ukraine
Tableau
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- 12+years of professional experience as a BI - Client's requirements analysis - Database modeling - Writing SQL scripts - Tableau data sources building - Tableau dashboard building - Intermediate English
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Seniority Senior
Location Zaporizhzhya, Ukraine
Communication Skills
SPSS
DATA ANALYST
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- Experienced software engineer with a strong background in computer science and a Bachelor's degree in Economics and Sociology. - Proficient in various programming languages, including but not limited to Java, Python, and C++. - Skilled in software development methodologies, principles, and patterns, with a solid understanding of the SDLC. - Experienced in developing and implementing software solutions, with a focus on problem-solving and delivering high-quality products. - Familiar with a wide range of technologies and tools, including MS Office Suite, SPSS, STATA, and more. - Strong analytical and problem-solving skills, with the ability to collaborate effectively in cross-functional teams. - Excellent communication and interpersonal skills, with a proven track record of delivering results and exceeding expectations.
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JavaScript
TypeScript
PHP
Java
Python
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- Senior Full-Stack Engineer with over 8 years of industry experience and a solid educational background with a Bachelor's degree in Computer Science from Holy Angel University. - Expertise in a wide range of programming languages (JavaScript, TypeScript, PHP, Java, Python, Golang, C#) and frameworks (React, Next.js, Vue, Node, Laravel, Django), enabling versatile full-stack development. - Proficient in modern DevOps and cloud technologies (Docker, Kubernetes, AWS, GCP), AI & ML implementations (PyTorch, TensorFlow), and creating responsive front-end applications that improve user experience. - A track record of building and maintaining large-scale, AI-integrated applications, such as a consumer savings app with 20,000+ active users. - Strong grasp of databases (MySQL, PostgreSQL, MongoDB, Firebase, Redis) and proficiency in Version Control (Git), improving collaboration and SDLC efficiency. - Demonstrated ability to drive projects from concept to deployment, with an emphasis on clean code, automated testing, and CI/CD practices.
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Python 7yr.
.NET 4yr.
ASP.NET Core Framework 4yr.
Node.js
FastAPI
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A seasoned Senior Software & Machine Learning Engineer with extensive experience in backend engineering, AI/ML, and data engineering. With a decade of professional involvement, the engineer boasts a deep understanding of distributed computing and database design, having worked with technologies like .NET, Python, Spark, and Kubernetes. Education includes a BSc in Computer Science & Artificial Intelligence, reinforcing a solid foundation in modern engineering principles. Holds a proven track record of implementing intelligent systems, such as conversational AI platforms and deep learning models, that have significantly improved user engagement and reduced operating costs. The engineer's technical acumen is further highlighted by expertise in full-stack development, including the use of React, Svelte, and Angular, and in creating robust cloud-based solutions leveraging AWS. This combination of practical experience and education makes the engineer a standout candidate for driving innovation and efficiency in complex software environments.
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Seniority Senior
Location Ireland
Python
Java
JavaScript
C/C++/C#
PHP
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Proven Software Engineer with robust academia in Intelligent Systems & Software Engineering, adept in Python, Java, and AI/ML technologies. Offers hands-on experience in AI model training and software development, with expertise in algorithm optimization and system design. Noteworthy involvement in developing an AI-augmented code optimization framework and a performance predictor project during BSc. Combines technical prowess with data annotation and model evaluation finesse, poised to thrive in AI innovation.
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Seniority Junior
Location Kerugoya, Kenya
Python 5yr.
JavaScript 5yr.
Java 2yr.
TypeScript
SQL
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A highly proficient Full-Stack Developer with over 7 years of experience, specializing in AI and NLP applications alongside web development. Adept at optimizing large language models, designing intelligent systems, and developing full-scale software solutions. The engineer's technical skill set encompasses Python, JavaScript, TypeScript, Java, C++, and SQL, with mastery in AI & NLP tools such as Hugging Face and TensorFlow. Their proficiency extends to full-stack development with a focus on MERN stack and Vue.js, demonstrated by a history of delivering high-performance, responsive e-commerce platforms, and proprietary CMS interfaces. With a Bachelor's degree in Computer Science and a strong background in DevOps practices, cloud platforms, and deployment technologies, the candidate has a proven track record of enhancing backend performance and streamlining deployment pipelines, positioning them as an asset for technically demanding roles.
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Seniority Senior
Location Lviv, Ukraine
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