Upstaff Developer Profile Directory

- 3 years of commercial experience, early projects since 2017. (Vue.Js, JavaScript, Chrome extensions) - Has good knowledge of JavaScript, working with arrays, working with elements, sorting and data algorithms. Good understanding of HTML and CSS. - Familiar with methodologies, principles, paradigms, and patterns in software development. - Vuex for state management and Styled Components for styling. - Rest APIs (Google, NovaPoshta) and Git for version control. - Tailwind, Figma, and Webpack for UI - Experienced in using Google Firebase, Cloud Firestore and Authentication.

- Software Engineer with over two decades of experience, specializing in system design, and system integration (System Design, Technical Leadership, System Integration, Scalability, Security, Communication, Documentation); - Strong abilities with React.js for building, interactive web applications; - Experienced in Java, Spring Boot, and creating microservices; - Skilled in Node.js for backend development; - More than 20+ years of experience with Delphi, Deep knowledge with different versions of Delphi to 10.2; - Experience with various localisations and Delphi UIs; - Expert in various programming languages including C++, JavaScript, and Python; - Experienced in database management with Oracle, MySQL, and PostgreSQL among others (Data Modeling Database Management, Normalization and Denormalization, Data Integrity, Data Warehousing, ETL, SQL and Query Optimization, Database Design, Stored Routines and Packages, Data Backup and Recovery, Data Migration, Web Scraping); - Experience in technical leadership in various domains such as enterprise software, finance, and healthcare.

• 15+ years JavaScript programming • Over 10 years in Node.JS programming • Familiar with React.js • Experience building highly scalable distributed web applications and browser extensions • Extensive experience with REST services • Strong communication and cooperation skills • Solid experience as a Backend developer • Fluent in English, written and spoken • long Term experience in remote work with USA and Europien companies • Self-directed person, with proven ability to manage goals and deadlines effectively

- Served as a Senior Software Developer in the Two German Automotive Navigation Projects, focusing on System Team operations as well as Map and Routing domains. - VPN and Network Filtering Development: Extensive experience developing VPN solutions, including cross-platform engines for KeepSolid’s VPN Lite, and expertise in low-level network filtering, proxies, and handling internet traffic. - iOS Development Expertise: Over 10 years of hands-on experience with iOS development, including business apps and secure communication tools, with proficiency in Swift and Objective-C. - C++ Proficiency: Strong background in C++ for developing core network functionalities, optimizing performance, and building cross-platform applications. - Enterprise Application Development: Skilled in developing enterprise-level applications, including parental-style internet filters and device policy management tools. - Agile Methodologies: Proven track record of working in Agile Scrum environments, delivering high-quality software with fast iteration and strong collaboration. - Leadership and Team Collaboration: Experience as a Tech Lead, mentoring teams, and coordinating with stakeholders to resolve issues and implement new features. - Available to start ASAP

• 11 years of practical experience in software development. • Excellent experience with application engineering, architecting and development. Capable of analyzing, designing complex, high loaded systems, efficient resources management and problem solving. Quick learner of new technologies. • Fluent English level.

- 5 years of commercial experience with PowerBI and Tableau - 4 years of commercial experience with SQL - Prepared a comprehensive analysis of the US real estate market with Spotfire - Assessed data quality from sources that contained tens of thousands of customer and transaction data, by using SQL in Azure SQL Database - Employed data-driven techniques to develop RFM analysis, and create interactive dashboards for customer trend visualization and high-value business proposals - Upper-Intermediate English

- Experienced SAP Engineer with a diverse background in SAP development, data management, application support, and auditing; - Strong expertise in ABAP programming, including report development and debugging; - Demonstrated experience in system customization, gap analysis, and addressing business requirements; - 6+ years of experience in SAP (PM, MM, WM), customizing, LSMW tools, VBA code, and ABAP; - 4+ years of relevant experience in SAPUI5, Fiori, BTP, S/HANA, CDS, ODATA; - Familiar with SAP FI, CO, and SD; - 9 years of experience as an auditor; - Upper-Intermediate English.

- 12+ years of experience in the implementation and support of MM/SD functionalities; - MM consultant to 3 SAP R/3 implementations, SD consultant to 2 SAP R/3 implementations; - Integration specialist with external systems: 3PL - WMS, Web Application, with client accounting systems; - Full life cycle Implementation Projects: 5 and additional integration projects; - Primary Module: MM - Material management; - Secondary Module: SD - Sale and Distribution, LE - Logistic Execution; - Technical skills: ABAP, Data Dictionary, Search Objects, ABAP Query, BAPI, BADI, RFC, Smart Forms, LSMW, Batch Input, Standard IDOC (for integration with external systems), VBS Script, VBA, API in VBA, MS, Access, SQL - Industry exposure: Chemicals, Retail, Electronics Consume; - Training: Class Instructor on MM/SD Modules, Preparation of training scenario/documentation. - Advanced English - German proficiency level – B2 written and B1 spoken

- Data Scientist with 4+ years of experience specializing in delivering insights and solutions using analytics, machine learning, and data science across diverse industries. - Profound technical expertise with Python, utilizing libraries such as pandas, numpy, TensorFlow, and Keras, and deploying solutions with tools like Docker and FastAPI. - Successfully led data science projects focusing on market analytics, computer vision, and content moderation, demonstrating a strong background in ETL pipelines, predictive modeling, and deploying RESTful services. - Holds a Master's in Computer Science, augmented with certifications from Google Cloud and DataCamp, and is proficient in implementing ML methodologies, including NLP, CV, and time series analysis. - Experienced in RDBMS such as MySQL and PostgreSQL, cloud platforms like AWS and GCP, and has practical knowledge of software development life cycles and agile methodologies. - Fluent in English and Ukrainian, embodying strong multidisciplinary team leadership, evident in the management of complex projects and innovative solution development.

- 11+ years of experience in IT - 10+ years of experience with XSLT/XML - Writing, testing and maintaining XSLT code that applies mapping on XML and output JATS XML & HTML - Familiar with many processing engines like Saxon (Java) - libxslt (C) - Python’s package - Upper-intermediate English - Available ASAP

- 24 years of professional expertise in the IT industry; - 2+ years of work experience with Kubernetes; - 6+ years of experience with Docker; - Solid skills in working with AWS Cloud Platform; - Experience with blockchain projects on Ethereum and Polkadot; - Deep knowledge of building and supporting monitoring and alerting systems using Grafana and Prometheus; - Good understanding of work with Terraform. - Skilled in designing, building, and improvement of the IT infrastructure; - Experienced in the implementation of solutions on Microsoft\ Apple \ and Unix platforms - Deep understanding of building virtual and cloud environments; - Experience in building corporate backup systems;

Backend Engineer with proven expertise in scalable and secure products using Node.js, Express.js, and MongoDB. Demonstrates technical proficiency in building RESTful APIs, integrating payment services like Paystack, and deploying robust authentication systems. Engages in content creation, sharing backend tutorials while also fostering a community of developers. Holds a bachelor's degree in Environmental Education with further specialization in backend engineering through a diploma. Proven track record in problem-solving and product enhancement within a collaborative team in the travel industry. Key projects include a full-stack Blog Authentication System and a Wallet Transaction System, showcasing proficiency in Node.js, Express, MongoDB, and JWT.

Engineer with a B.Sc. in Mobile Development and over 4 years of hands-on experience in Android development, exhibiting a strong command of Kotlin, Jetpack Compose, and modern software engineering practices. Demonstrated expertise in app architecture modernization, reducing build times by 40%, enhancing app stability with comprehensive testing, and leading migration to scalable, modular architectures. Proven track record of impactful project management, having developed 600+ public-safety apps, and improved essential communication tools with a robust VoIP/messaging suite resulting in a substantial increase in user satisfaction. Competent in cross-functional team leadership, Agile methodologies, and continuous integration/delivery systems, making them a valuable asset for cutting-edge software development teams.

Software engineer with 5 years of experience specializing in full-stack development, adept in both front-end and back-end technologies. Key skills include mastery of React.js, Redux Toolkit, Node.js, Express.js, and familiarity with modern frontend frameworks. Proven track record of driving innovation and handling complex problems, demonstrated by achievements such as the AI-driven navigation bar and data analysis in computational notebooks at BetterBrain. Expert in enhancing user experiences, improving operational efficiency by 30%, and mastering data management solutions. Academic background supported by a Bachelor's degree in Computer Science and continuous professional development through courses. An engineer proficient in SDLC, agile methodologies, and modern development practices, ready to deliver top-tier web applications.

Versatile Junior Developer with expertise in React.js, Core PHP, CodeIgniter, MySQL, and JavaScript, along with a solid foundation in database systems and software engineering from B.Tech in Computer Science. Demonstrated skills in developing dynamic web applications, implementing CRUD operations, and designing secure API integrations. Proven ability to work collaboratively in team environments, paired with a commitment to maintaining high-quality standards in line with CMMi guidelines. Recognized for efficiently handling client requirements, troubleshooting issues, and mentoring junior team members. Portfolio includes building a multilingual import-export platform and a finance tracking app. Holds a Full Stack Developer Certification, showcasing proficiency in modern web technologies.

- 7 years of experience in C/C++ software development with a focus on embedded and firmware systems; - Expertise in Linux-based environments, networking, and system-level programming, including DHCP, DNS, ARP, and VoIP; - Skilled with OpenWRT, Buildroot, U-Boot, and debugging tools such as GDB, Valgrind, Wireshark, and tcpdump; - Experience in WiFi 6 and LTE/5G SA/NSA gateway development, performance optimization, and legacy code refactoring; - Knowledge of CI/CD (Jenkins), scripting (Bash), and virtualization (QEMU); - Skilled in team management, code review, and process improvement, ensuring product quality and delivery efficiency across all project phases.

Expert with Angular, Typescript, Javascript, RxJs, enteprise level applications. Currently learning React and Next.js framework

Expert software engineer with 20+ years of experience specializing in backend and full-stack development. Proficient in an array of languages like PHP, Visual Basic, and JavaScript, with a strong foundation in database architecture across MySQL, PostgreSQL, and SQL Server. Demonstrates a consistent track record of optimizing system performance and scalability, evidenced by a 40% reduction in load times and a successful migration from Delphi to PHP. Holds an engineering degree and numerous technical certifications, underpinning a solid educational foundation in computer science. Recognized for advanced technical skills and delivering high-impact projects such as ScanChex Mobile and comprehensive payroll and administrative systems.

With over half a decade of experience, the engineer stands out as a seasoned React Developer who possesses a deep understanding of front-end technologies including ReactJS, NextJS, JavaScript, and Typescript. An adept professional in employing Rest APIs, Redux, and various CSS frameworks such as Material UI and Tailwind for creating responsive and user-friendly interfaces. The engineer's portfolio includes significant contributions to diverse domains like Social Networking, AgriTech, and IT Services, which showcases versatility and technical acumen. Leveraging a strong background in the entire software development life cycle, the engineer has a proven track record in implementing CI/CD pipelines and maintaining code versions using Git, demonstrating an expertise that optimizes application features and ensures delivery of high-quality software products.

- 8+ years of experience in backend development with a strong focus on Python and distributed systems. - Expertise in Django, FastAPI, and Flask, including experience building and optimizing microservices architectures. - Skilled in designing and maintaining REST APIs and GraphQL services for large-scale telecom, healthcare, and e-commerce platforms. - Deep understanding of PostgreSQL, SQLAlchemy, and MySQL, with experience in database design, optimization, and performance tuning. - Skilled in Docker and Kubernetes for containerization and orchestration, as well as CI/CD pipelines setup using Jenkins. - Experienced in asynchronous programming and real-time systems development. - Strong knowledge of OOP, SOLID, and design patterns, with experience implementing secure and testable backend code. - Worked with AWS (EC2, RDS, S3) and Azure AD B2C for authentication and cloud infrastructure management. - Background in AI integration, data encryption, and authorization systems for enterprise-grade software solutions.

- 7+ years of experience in C++ software development across desktop and embedded systems; - Experienced with 15+ commercial projects in automotive, fintech, and embedded domains; - Skilled in C++, Qt, QML, Python, and experience with JavaScript, Lua, and TypeScript for cross-platform applications; - Skilled in REST API, HTTP, VoIP, SIP, and DICOM integrations; - Experience with GitLab, Jenkins, Azure, TFS, SVN, CodeBlocks, QtCreator, and Visual Studio across Windows, Linux, and Mac environments; - Solid understanding of SDLC, clean architecture, software optimization, and code refactoring for performance and maintainability; - Experienced in mentoring team members, code reviews, and ensuring adherence to best engineering practices.

Software engineer with extensive experience in Python development, application support, and financial systems. Strong expertise in technologies such as Django, Flask, Oracle, SQL, and data visualization through Power BI. Proven background in Python script automation and API creation for banking applications, improving operational efficiency by 30%. Skilled in cross-functional team collaboration, version control with Git, and maintaining critical 24/7 financial systems. Adept in machine learning and data science methodologies, poised to contribute to technology advancement in a reputed organization.

Frontend Developer with over 1 year of self-led learning and 9+ months of hands-on project experience. Expertise in JavaScript, TypeScript, React.js, and Python. Proficient with backend technologies such as Node.js, Express.js, and NestJS, including RESTful APIs and database management using PostgreSQL and Firebase. Demonstrated ability in deploying web applications with tools like Render and CI/CD practices. Strong focus on responsive design, accessibility, and performance optimization, underpinned by knowledge of modern development methodologies and design patterns.

Seasoned Full-stack Developer with a comprehensive understanding of both front-end and back-end technologies, proficient in React, Node.js, and NestJS. Brings over 3 years of commercial experience in creating web applications and automation bots, with a proven track record of optimizing performance and enhancing prompt designs for LLMs resulting in a 30% quality improvement. Demonstrated success in scalable solution development with a focus on efficiency, evident from a 40% MySQL query performance enhancement. Holds solid DevOps fundamentals with hands-on experience in Docker, Git, CI/CD, and a diverse tech stack encompassing Sequelize ORM, Python, and various LLM APIs. Proactive problem-solver and an advocate for clean code practices, geared with a strong education in technology, highlighted by a notable GPA from AEH. Eligible to work in the EU, multilingual with proficiency in English, Polish, Russian, and Belarusian, and with a future plan to potentially shift base to Düsseldorf in 2026.

Full Stack Developer and AI/ML Engineer with a solid foundation in computer science from the University of the Punjab and over two years of software engineering experience before transitioning to machine learning. Proficient in creating scalable ML pipelines and backend development, with hands-on expertise in Hugging Face, LangChain, and vector databases like Pinecone and FAISS. Technical skill set includes Python, Flask, Django, and cloud services across AWS, GCP, and Azure, with a focus on applying NLP, LLMs (GPT, BERT, LLaMA), and AI automation to practical business processes. Proven track record in ML workflow optimization, MLOps, and DevOps, underscored by significant improvements in automation efficiency, authentication reliability, and data processing times.

- 5+ years of experience in Python backend development, focused on distributed systems, REST API design, and microservice architecture; - Experienced with FastAPI, Django, and Django REST Framework, with a deep understanding of framework internals and asynchronous programming (asyncio, Celery, Kafka); - Experience developing and maintaining scalable APIs and high-performance backend services for AI-driven platforms, cryptocurrency systems, and automation tools; - Solid knowledge of RDBMS systems with emphasis on PostgreSQL - database schema design, optimization, and query performance tuning; - Experience with SQLAlchemy (declarative and async modes) and integration of data pipelines across multiple services; - Skilled in Docker-based deployments and cloud environments (AWS, Azure) with hands-on CI/CD setup and monitoring; - Experienced in secure authentication systems (JWT, OAuth2) and real-time data streaming using Kafka and Celery; - Strong command of SDLC, code quality, testing (Pytest), and Agile methodologies; - Experience in AI integration - building and deploying AI agents and workflow automation tools with LangChain, Supabase, and Firebase.

A seasoned software engineer with extensive experience in developing, maintaining, and testing systems, particularly with the Open Source SONiC OS at Nokia. Proficient in a wide range of programming languages including Rust, C/C++, Python, TypeScript, Lua, and scripting with Bash. Demonstrated expertise in Linux kernel development, network protocols, containerization with Docker, and CI/CD pipelines using Gitlab. Contributed significant automation improvements through tools like Ansible, Prometheus, and Grafana. Additionally, has a background in service desk support with a focus on Azure and Active Directory, and demonstrates ongoing commitment to professional development as shown by their technical degree from Hive Helsinki, with a strong foundation in algorithms, network programming, and game development.

- Full Stack Developer with 5+ years of experience building and scaling web & mobile applications using the MERN stack, React Native, and DevOps practices, including Docker, CI/CD, and AWS. - Adept at designing, developing, and deploying production-ready MVPs for various clients, with a record of 25+ successful product launches. - Proficient in React.js, such as employing advanced state management with Redux and React Context, and optimizing performance with best practices like lazy loading and code splitting. - Technical writer and educator with content reaching over 700K readers, contributing to freeCodeCamp and other tech platforms, enhancing knowledge sharing within the developer community. - Holds a BTech in Computer Science, providing a solid foundation in software engineering principles; experienced in collaborating with design teams to create fluid, responsive UI/UX for web applications. - Demonstrates a deep understanding of software development life cycle and modern development methodologies, as well as a knack for teaching coding and assisting clients with SEO and organic growth.

I help enterprise teams automate and simplify Oracle data workflows, integrations, and large-scale backend systems. Experienced across healthcare, telecom, logistics, retail, manufacturing, consulting and public sector, I solve database reliability and performance problems for mission-critical applications. Available for remote freelance/contract projects, specializing in PL/SQL, Python, Oracle EBS R12, ETL pipeline automation, and cross-time zone support.

* Software engineer with 6+ years in mobile Android (Kotlin, MVVM and Clean Architecture). * Master's degree in Computer Engineering * Experience with Android SDK, Jetpack components (Room, Dagger/Koin Compose), Android Views, and integrating with RESTful APIs and various hardware (e.g., portable printers, scanners, Bluetooth devices). and REST API integration, Git/GitFlow, and API integrations. * 4 years with ERP systems (internal use: employees, warehouse, workers "in fields") for mobile devices and hardware (e.g., portable printers, scanners, Bluetooth devices). * Led a team of Android developers, mentoring junior engineers, conducting code reviews, and coordinating with cross-functional teams to ensure the timely delivery of high-quality products. * Passionate about delivering user-friendly solutions that solve real-world problems.

At DBB Software, we deliver custom software products tailored to your needs, leveraging our set of pre-built solutions that reduce your development time by up to 50%. As a certified AWS Partner, we excel in migrating any system or workload to the cloud, ensuring your setup is up to industry standards and primed for success.Our services: Web Development Mobile Development DevOps Engineering AI/ML Development Software Integration (CMS/CRM/ERP) AWS integration Dedicated Team Team Extension IT Support & OperationsIndustries: E-commerce Real Estate Social Network HR platforms Logistics HealthCareOur Approach: We use pre-built solutions with ready-made blocks to speed up development, leading to: 50% reduction in development time. Up to 30% faster POC and prototype stages. 50% less planning time.Why DBBS? 10+ years of industry experience 100+ skilled software engineers 5+ years is the average employee tenure. 6+ years of client lifetime We’ve successfully completed over 100 projects for industry leaders such as JLL, WeWork, RedAlpine, Philips, DispatchHealth, and Doctify, helping secure substantial funding for our clients, including $50M for a healthcare startup, $11M for a marketplace, and $5M for a real estate platform.

I am a seasoned blockchain developer with proven experience in building, optimizing, and scaling projects across multiple layers and ecosystems. Beyond development, I also bring strategic connections and marketing expertise to help projects succeed from launch to adoption.