Upstaff Developer Profile Directory

- Full-stack development with 6 years of extensive experience in back-end and front-end development across various industries, including healthcare, education, consumer goods, and hospitality. - Strong expertise in server-side programming with PHP, including advanced knowledge of PHP 7.x and 8.x. - Extensive experience creating responsive and user-friendly interfaces using HTML5, CSS, and JavaScript. - Skilled in modern JavaScript frameworks and libraries, including JQuery and Ajax for dynamic web applications. - Experienced in utilizing WordPress for content management and website development.

Software engineer with over four years of mobile development experience across multiple platforms and a strong educational background including a BSc Honors in Information Technology. Proficient in languages such as Dart, Kotlin, Swift, Java, JavaScript, and TypeScript, and skilled in frameworks like Flutter, Jetpack Compose, and SwiftUI. Experienced in working with tools like Xcode, Android Studio, and GIT. Has a portfolio of quality applications and a proven track record in full software development life cycle (SDLC), test-driven development (TDD), and collaborating with cross-functional teams to deliver apps with effective UI design and robust security measures.

- Commercial Experience with Mobile Development since 2016 in the banking, insurance, health and beauty industries, education and e-commerce - Senior and Lead Developer, able to organize the process of building an application both by himself and by a team - 4+ years of commercial experience with Flutter and Dart - 5+ years of experience with Xamarin - Significant experience in development with Firebase - Proven experience with start-ups in early stages of growth - Extensive experience of work with international companies in Canada, the UK, Saudi Arabia, the UAE, Egypt, Jordan, Kuwait - Experience in MVP and architecture development of complex mobile applications such as mobile banking and e-commerce platforms. - Experience with SDKs and APIs - AI/ML enthusiast - Excellent soft skills scaled up in work in mixed teams in international companies, open-minded, trouble-shooter, great communicator and experienced mentor - Upper-Intermediate English - Native Arabic - Available ASAP

Software Engineer with expertise in backend development, blockchain technology, and big data, boasting a solid foundation in computer science from Ukrainian Catholic University. Holds a strong junior/middle experience level, with hands-on Rust, C++, and a gambit of modern technologies such as Solana, Axum, and Kafka. Proven track record of developing robust solutions for cryptocurrency swapping and NFT architecture, time-series data manipulation, and digital media copyright solutions. Notable achievements include contributions to open-source projects, and winning a national programming tournament. Fluent in advanced software engineering paradigms and well-versed in real-time streaming and machine learning library development.

- Сommerce experience with Asciidoc since 2016, wrote a book using this tool - Github: https://github.com/Patola - English: Fluent - Portuguese: native language. - Spanish: intermediate - French: intermediate

Software engineer with over 8 years of experience in Android app development and team leadership, proficient in Java and Kotlin. Expertise in application architecture, UI/UX design, database management with SQLite, Room, Firebase, and Firestore. Skilled in project management tools like ASANA, Trello, and Slack. Extensive knowledge in REST APIs, third-party libraries, and payment gateway integration. Proven track record of delivering projects on time using Agile methodologies while implementing best practices in code review, unit testing, and maintaining app performance. Technical acumen is demonstrated through the successful delivery of diverse projects spanning digital wallets, e-commerce, and logistics.

Software Engineer with over 5 years of experience in Flutter development for iOS and Android platforms. Adept at the Dart language, the engineer excels in creating high-performance and visually appealing apps with responsive design. Their technical expertise includes MVC/MVVM patterns, state management, and implementing deep/dynamic linking. Proficient in integrating with various databases like SQLite and Firebase and utilizing PM tools like Trello and Slack. The candidate has a strong background in developing and managing complex projects, evidenced by their history of timely project deliveries and effective client communications. Their significant role in development, testing, and deploying applications with third-party integration and unit/widget testing underlines their comprehensive skill set in software engineering.

- Fast-paced, high-quality, detail-oriented, and self-motivated developer with more than 10 years of experience in the IT industry. - I use the TDD approach for designing the architecture and implementing scalable and maintainable web apps/services. - I have been working on a bunch of projects and meanwhile, I worked in several positions across frontend developer, backend developer, full-stack developer, and lead engineer. - Bridge Smart Contract which is for transferring tokens across networks. - NFT Dapps such as madlab, Art Basel, Fateful Youth - eWallet App and GSM e-commerce product. - Smart contracts in complex Defi and DEX structure - Blockchain networks including Ethereum, BSC, Polygon, and Solana. - Deploy and work on various kinds of tokens - ERC20, ERC721, ERC721A, ERC1155. - Cross-chain smart contracts using LayerZero - NFT market smart contract for auction and offer with lazy minting - Proxy smart contract - NFT marketplace Dapp using Venly - Available: ASAP

- 5+ years of experience in blockchain development - Advanced English - Available ASAP

- 15 years experience with programming languages VB, C/C++; - First projects - embedded devices on AVR/STM32/ESP and applications for windows. - But since ~2017 I'm using an embedded experience very seldom and mostly developing software for Linux on C++. - Since 2022 I have switched the Rust and don't want to use C++ as the main language anymore. - Intermediate English.

- Fast-paced, high-quality, detail-oriented, and self-motivated developer with more than 10 years of experience in the IT industry; - I use the TDD approach for designing the architecture and implementing scalable and maintainable web apps/services. - I have been working on a bunch of projects and meanwhile, I worked in several positions across frontend developer, backend developer, full-stack developer, and lead engineer; - In-depth skills develop smart contracts on Solidity; - Good skills working with Go; - 3 years experience with Rust; - 2 years experience with Substrate; - Smart contracts in complex DeFi and DEX structure; - Bridge Smart Contract which is for transferring tokens across networks; - Proxy smart contract; - eWallet App and GSM e-commerce product; - Blockchain networks including Cosmos, Ethereum, BSC, Polygon, Avalanche and Solana; - 5+ years experience with Node.js; - Deep skills working with Apollo GraphQL; - Good abilities working with Hardhat framework; - Deploy and work on various kinds of tokens - ERC20, ERC721, ERC721A, ERC1155; - Cross-chain smart contracts using LayerZero; - NFT Dapps such as madlab, Art Basel, Fateful Youth; - NFT market smart contract for auction and offer with lazy minting; - NFT marketplace Dapp using Venly; - Available: ASAP.

- 3 years of experience with Rust - Efficiently deployed web application powered by rust backend. - Built innovative microservices and Web Services using Web Actix and diesel. - Engineered and maintained modern web assembly application using Rust . - Developed web application using sqlx and Web Actix. - Strong front-end interaction skills with Solidity transactions. - Highly qualified knowledge of working with Metamask wallet, transactions, and fees for them. - Upper-Intermediate English. - Available ASAP.

- 7+ years experience as a web developer; - 2 years of experience with developing smart contracts in Rust; - Deep skills working with Solana blockchain; - Good abilities working with Anchor; - 5+ years experience working with C#; - Good knowledge of JavaScript, and TypeScript; - 2+ years experience working with Angular framework; - Experience with Node.js, and NestJS; - Good abilities working with .NET; - Experience working with Docker; - Upper intermediate English.

- More than 17 years of commercial experience in IT; - Experience cooperating with clients worldwide and building products related to various spheres: e-commerce, real estate, custom CRM, trading, social media and many more. Product tech design and full cycle of development and support; - Deep experience in development web applications using Ruby on Rails, Rust, Java, JavaScript, Go; - Strong experience of AWS, Azure Clouds, Google Clouds; - Experience in team leading and CTO; - Upper-Intermediate English; - Available: ASAP.

- 8 + years experience in IT; - 5+ years experience working with Rust; - Good skills in creating smart contracts for Solana and NEAR Blockchains; - Experience in building a bridge to Casper Network; - Experience working with Filecoin, Zero Knowledge modules, and Fuel Blockchain; - Deep abilities with MySQL, PostgreSQL, MongoDB; - Experience working with Python, Java, PHP, Scala, and Spring; - Good knowledge of AWS ElasticSearch; - Experience working with Docker and Kubernetes (K8s); - Experience working with DeFi and DEX projects; - Deep skills with Apache Cassandra and Apache Spark; - English: Upper-Intermediate.

- 4 years of development experience, including 2 years of Rust development and 2 years of previous Python backend development experience. - Development and design of high-load fintech solutions using Rust and Python - Experience with Rust microservices (Actix Web, Rocket, AWS Lambda) - Upper-Intermediate English

- Started career as a Ruby on Rails developer and worked exclusively with it for around 4 years, after which switched to Elixir and have 3.5 years of commercial experience with it - Last version engaged with RoR: 5.2 - Proficient in Phoenix / Elixir, Ruby on Rails, and AngularJS, focusing on performance improvements, test coverage, and refactoring. - Foundational knowledge of Haskell and Plutus for writing smart contracts on the Cardano blockchain. - Upper-Intermediate English

- More than 10 years of experience in developing applications using JavaScript and TypeScript - Experience with a setup a blockchain IoT network using the Hyperledger(infrastructure) - Built a system and smart contracts, that are deploying into ETH network for digital signing of contracts for each deal of customers - Setup an ETH explorer - Build a web game, based on Solana, NFT tokens - Experience with a migration from a monolithic architecture to microservices, it helped to spread jobs between teams and increased development speed, also here grew and lead the most productive team in the company (11 people) - For the KYB/KYC platform startup based in Estonia architectured and implemented a whole app with Nest.js and React, it helps to build scale and flexible application, CQRS architecture - Built processes for project lifecycle from development to release, CI/CD, started and scaled team, held workshops for the team - Built a headless modern framework for frontend that based on React, swiftly increased a development speed - Solved problem with a slow project building, increased speed x7.7 (210s ->27s) - Supported a quite aging project and migrated some parts to microservices, wrapped into Kubernetes - Optimized database queries, increased x3 - Suggested a better structure for a codebase for GraphQL and React, increased development speed - Architecture & Tech Lead at Node.js Department

Software engineer with extensive experience in mobile development for platforms including iOS and Android, specializing in Flutter. Skilled in upgrading and optimizing applications, evidenced by migrating a codebase from Flutter 2.5.0 to 3.3.0 within 3 months and implementing a dark mode theme. Demonstrated expertise in integrating bank APIs, adding savings features, and transitioning from Provider to Riverpod for state management. Proven ability in using Lottie for smooth animations and developing responsive designs, alongside proficiency in Dart, HTML5, and Postman API technologies. Holds a Bachelor's degree in Electrical and Electronics Engineering, underlining a strong engineering foundation. Co-founded a health-tech startup and contributed to e-commerce, Fintech, AI, and health sector projects, showcasing a breadth of industry exposure and technical versatility.

The engineer in question manifests proficiency in mobile application development, with extensive experience in the creation and enhancement of complex platforms within the Nigerian market. Possessing demonstrated expertise in Flutter and Dart for cross-platform development and a grasp of native API interfacing using Swift and Kotlin, the engineer has effectively employed TypeScript for cloud function management on Firebase. Additionally, the engineer has skilfully set up CI/CD with Fastlane and integrated real-time communications with websockets, contributing to the delivery of robust, user-friendly applications. Maintaining a strong focus on performance and stability, the engineer leverages tools such as Firebase Crashlytics and Flutter's performance profiling. Moreover, the engineer's background encompasses a Computer Science degree, providing a sound theoretical foundation underpinning their practical skills. With a portfolio featuring innovative features like AI-based verification, video calling via the Agora SDK, and advanced in-app transaction functions, the engineer’s technical acumen ensures a performance-focused and user-centric development approach.

Software engineer with 4+ years of experience specializing in mobile app development, including UI/UX design, with expertise in Flutter and integrations with Firebase. Highlights include leading the development of mobile platforms for companies like Boostmate Inc and PDA Funds, improving app performance, and maintaining high coding standards. Proven track record in applying Agile methodologies, performing unit and E2E testing, and employing tools such as Git/GitHub for project management. Holds a computer science degree from Kwame Nkrumah University of Science and Technology, emphasizing this candidate's strong theoretical and practical foundation in software engineering.

Seasoned software engineer with a Bachelor's degree in Computer Engineering and 4+ years of experience in app development. Proficient in Dart, Swift, Obj-C, Java, and skilled in MySQL. Delivered a patient aid app using Flutter & iOS with coreML integration. Played pivotal roles in agrotech projects, contributing to social media feed functionality and offline accessibility. Expertise extends to Flutter plugin development, enhancing data syncing, and deep linking. Solid background in SDLC, agile methodologies, and CI-CD practices, leading to efficient and effective project execution.

Software engineer with a B.Tech. in Computer Science from VIT, bringing over 2 years of experience in software development with a focus on Flutter, Angular, and Java. Known for leading a team of developers to a 25% productivity increase and spearheading project efficiencies that cut time-to-market by 20%. Engineered solutions for Amadeus Labs that enhanced code quality and accelerated development speed, including a pivotal legacy code migration to Angular 15, which significantly improved user experience. Proven expertise in mobile and web app development, evidenced by the successful launch of an Anime Social Entertainment App and a personalized image-sharing app 'Qutu', with the latter achieving 2k downloads within its first 6 months on the Google Play Store. Proficient in Dart, NodeJs, Firebase, Google Analytics, and modern SDLC practices, this engineer's technical acumen and industry experience make them a standout candidate.

- Lead Java Engineer and Architect with extensive experience designing and implementing scalable, high-loaded solutions for cloud services and secure VPN connections. - Proficient in Java (J2SE, J2EE), C#, Python, HTML, CSS, JavaScript, and Angular. - Expertise in frameworks and technologies such as Spring Boot, Spring Framework, Servlets, REST web services, JUnit, Dropwizard, and EJB3. - Skilled in building and maintaining CI/CD pipelines, deployment flows, and conducting deployments. - Proficient in working with GCP and has experience with AWS and Azure. - Experienced with databases and search technologies, including ElasticSearch, MongoDB, PostgreSQL, Derby SQL, Couchbase, and Google Cloud SQL. - Strong capability in requirements analysis, documentation creation, and customer communication. - Proven leadership in mentoring and guiding junior developers and leading development teams.

- Full-Stack (Python + Vue.js) Software Engineer with a background in digital marketing; - Core Python, Flask & Django Frameworks, reusable code - RESTful APIs - MVC, SOLID, DRY principles; - SQL, Django ORM, Elastic Search Platform - Upper-intermediate English; - Available ASAP

* Software Engineer with 4+ years of full-stack development experience, specializing in utilizing modern web technologies like React, Next.js, and Node.js. * Holds a Bachelor's degree in Computer Science from Al-Azhar University, demonstrating a strong foundation in key theoretical principles, including Computer Graphics and Artificial Intelligence. * Proven track record at Awtar Tech, including leading a Front-end team to successfully migrate a static site to a dynamic platform, significantly improving user engagement. * Demonstrates expertise in front-end development and web app design, complemented by experience in architecting database systems and developing CRM solutions. * Engaged in freelance work, providing tailored web design and development using HTML, CSS, JavaScript, and Figma, indicating a capacity to handle diverse client requirements. * Proficient in multiple programming languages and frameworks with a focus on JavaScript, React, And Next.js, underpinned by practical experience with cloud deployments on platforms like Heroku and Netlify.

- PHP Backend-developer with 10+ years of experience. Most of my career I use Laravel as my main instrument. Worked in teams up to 10 members as backend-dev. - Also worked as freelancer - full-stack dev/manager: finding clients worldwide and communicating with them directly, creating teams of 2-3 people and managing their work - Upper-Intermediate English

-Software Engineer with 5 years of professional experience, working across eCommerce & retail, Marketplace, Healthcare, Entertainment, Education, and Blockchain, Game domains. -Proficiency in PHP, JavaScript, TypeScript, React - Knowledge of Vanilla JS, Native PHP, PHP-Selenium - Experience working with Web3 marketplaces, nodes, on-chain, and off-chain transactions - Knowledge of Web3, understanding of Abi, Smart Contracts; Tampermonkey, Greasyfork - Knowledge Css3, Bootstrap 4; RPC; GitHub; MySQL - Has a successful track record of developing applications from scratch and optimizing existing systems, evidenced by projects such as a Learning Platform, Event Manager, and a Website for a Coin Game - Computer Science and Software Engineering Foundation

- Software Engineer with more than 5 years of commercial experience in software development - Interested in cloud computing, software architecture design, and efficient algorithms - Deep knowledge of Web development technologies - Excellent knowledge of common software engineering practices, like OO principles, modern design patterns, test-driven development, continuous integration, and continuous deployment - Extensive experience in building architecture and database optimization - Extensive experience in mentoring specialists, making code review - Quick learner, team player, goal-oriented and responsible. - Upper-Intermediate English

- Software Engineer with 5+ years of commercial experience building software from scratch; - Good knowledge of main clean code principles like DRY, SOLID, YAGNI, KISS; - Have experience building software solutions from the ground up: from discussion with clients or businesses to understand the problem, field of study and problem research, to deployment and post production support. - Upper-Intermediate English. - Available ASAP.

- Available to work in the EST. - 7 years of commercial experience with .NET - 3+ years of commercial experience with Typescript and Angular - 3+ years of experience with PHP - 12 years of commercial experience with XSLT and XML - Converting JATS XML files to HTML using XSLT transformation - Сonverting XHTML to HTML5 and including SVG tags instead of IMG tags - Сonverting JATS XML to IDML - Converting XML files to HTML - Upper-Intermediate English - Available ASAP

- Senior Data Engineer with 10+ of experience specializing in designing, optimizing, and maintaining data infrastructures, data flow automation, and algorithm development. - Has expertise in Python, SQL/NoSQL, ETL processes, PySpark, Apache Airflow, and an array of AWS services, complemented by a strong foundation in database systems and cloud-based solutions. Proven capability in handling large-scale data analytics and processing with a focus on performance and cost efficiency in cloud environments. Proficient in developing robust ETL pipelines, performing data migrations, and optimizing complex queries and storage procedures, leveraging extensive experience across multiple industries and platforms. - Start: ASAP - English: Upper-Intermediate