I am a graduated Software engineer and Java and Web developer with significant professional experience in various business areas. Dedicated and responsible person seeking a permanent position or a contract of Full stack Java developer in a reputed IT organization on basis of bachelor's degree in Software engineering and an extensive working knowledge in complete Core Java, J2EE programming and Agile methodology. Solid knowledge and working experience with Java development in the IT field for multinational companies. Experience with learning and using various open source frameworks and specific areas of common J2EE stack. Expertise in UI development – HTML, Javascript, Jquery, CSS, JSON. Extensive understanding and solid practical experience with the following broad technologies: XML, XSL, JSP, Velocity, PDF, Internet protocols, JDBC, relational databases, schedulers etc. Well developed skills in testing, debugging and troubleshooting all types of technical issues. Practical expertise with analyzing and investigating performance issues and memory-leaks. Ability to work on different projects simultaneously. Ability to handle the most stressed situations confidently and patiently emphasizing on the main objectives. Willing to visit seminars and lectures in order to improve my qualifications and obtain new areas of expertise.

I have used many languages over 20 years or so. I have experience with the following areas: C++,D, C# Pl/1,Pl/Sql, Perl, Python,HTML,XML, CSS,XSL, Delphi,Lazarus,Pascal, Php,Java,Javascripts , GWT, Flash, Google Spanner, Google Functions, Google Schedule,ImGui Databases: T-Sql, Oracle,Pl/Sql Domains: multithreaded programming, user interface design and implementation, server side, programming, parsers, databases, algorithm design, trading bots, gpu programming. Software: VIsual Studio, Visual Code, Eclipse, Ultimate++ Ide, Excel., Word, LibreOffirce, Pspad, Ultraedit,

Driven professional with broad technical skills with more than 20 years experience in IT consulting and software development and special focus on cross platform mobile development. Excellent communicator experienced in interpreting and implementing client visions of projects. Known for ability to multi-task and juggle multiple pressing projects simultaneously, meeting all deadlines. Thrives in an environment that constantly embraces new technology. KEY COMPETENCIES AND SKILLS Mobile and Web Development - Knowledge of AngularJS/Angular, Ionic, Typescript, Node.js, HTML5, CSS3, XML, JavaScript, hybrid development (cordova/capacitor), Single Page Application, ASP.NET MVC, ASP.NET WebAPI, SQL, NoSQL - Awareness of the Mobile and Web Development industry, and new technologies - Developing multi-user applications within service orientated architecture - Writing up technical manuals and user instructions - Strategically thinking through all parts of the design process - Knowledge of international web standards and protocols Professional - Able to organise own workload effectively and prioritise tasks - Can quickly understand business requirements and then translate these into functional requirements - Having a passion for customer service & responding quickly to enquiries - Adaptable and able to quickly pick up new techniques - Understanding of W3C standards, web accessibility & best practice Personal - Passionate about doing a good job - First rate interpersonal and communication skills, able to easily interact with fellow developers and customers alike - Strongly committed to all projects from inception right through to the end - Confident, friendly and easy to get along with

I am an independent software engineer with a very broad range of development skills and technologies. I most enjoy working in small innovative teams and with individual decision makers to help grow their ideas into mature and robust software systems based on modern technological foundations. I'm also not a stranger to big software companies, and I can be a reliable team member as well as a small group project architect/leader when needed. I have strong, many year experience with the following technologies: - Python, JavaScript, C++, C#, TypeScript, Java - Cloud Services, Amazon Lambda, AppEngine, Firebase, AWS, Linux, Serverless, DevOps. - Vue.js, React, Flutter, Android, NDK, GTK, Win32 API - DynamoDb, Datastore, MySQL, MS SQL, Redis, NoSQL. - Flask, Gunicorn, Django, Nginx, Apache. I'm also eager to extend my experience in cutting edge technologies and programming languages like Dart, Kotlin, Rust... I am looking for the opportunity to design and build a system from the ground up for you!

I focus on data engineering, software engineering, ETL/ELT, SQL reporting, high-volume data flows, and development of robust APIs using Java and Scala. I prioritize three key elements: reliability, efficiency, and simplicity. I hold a Bachelor's degree in Information Systems from Pontifícia Universidade Católica do Rio Grande do Sul as well as graduate degrees in Software Engineering from Infnet/FGV and Data Science (Big Data) from IGTI. In addition to my academic qualifications I have acquired a set of certifications: - Databricks Certified Data Engineer Professional - AWS Certified Solutions Architect – Associate - Databricks Certified Associate Developer for Apache Spark 3.0 - AWS Certified Cloud Practitioner - Databricks Certified Data Engineer Associate - Academy Accreditation - Databricks Lakehouse Fundamentals - Microsoft Certified: Azure Data Engineer Associate - Microsoft Certified: DP-200 Implementing an Azure Data Solution - Microsoft Certified: DP-201 Designing an Azure Data Solution - Microsoft Certified: Azure Data Fundamentals - Microsoft Certified: Azure Fundamentals - Cloudera CCA Spark and Hadoop Developer - Oracle Certified Professional, Java SE 6 Programmer My professional journey has been marked by a deep involvement in the world of Big Data solutions. I've fine-tuned my skills with Apache Spark, Apache Flink, Hadoop, and a range of associated technologies such as HBase, Cassandra, MongoDB, Ignite, MapReduce, Apache Pig, Apache Crunch and RHadoop. Initially, I worked extensively with on-premise environments but over the past five years my focus has shifted predominantly to cloud based platforms. I've dedicated over two years to mastering Azure and I’m currently immersed in AWS. I have a great experience with Linux environments as well as strong knowledge in programming languages like Scala (8+ years) and Java (15+ years). In my earlier career phases, I had experience working with Java web applications and Java EE applications, primarily leveraging the WebLogic application server and databases like SQL Server, MySQL, and Oracle.

Java Developer| Eligibility Specialist 1 |github PROFESSIONAL SUMMARY * Experienced in development and deployment of various Object oriented and web-based Enterprise Applications using Java/J2EE technologies and working on the complete System Development Life Cycle (SDLC). * Proficient in n-tier application design and development using Java, J2EE, Spring and Oracle. * Working Knowledge in JSON and XML technologies such as XSL, XSLT, XPath, parsers like SAX, DOM and JAXB. Restful Web services using JAX-RS API. * Worked in Development teams under various roles such as Designer, Tester, and Developer. * Developed applications using Multithreading, Serialization, Externalization, Collections and Generics * Used Spring Boot Actuator to monitor and manage the application in production environment. * Flexible committed individual with excellent interpersonal & communication skills, aiming to

I am a Senior Web and Mobile Developer with full-stack application development experience focused on open source technologies and frameworks My experience encompasses building responsive web sites using modern web frameworks; cross platform mobile application development for enterprise and startups, I also have extensive experience in system integration with web services and databases. Having worked on a wide range of projects across multiple industries including financial services, pharmaceuticals, transportation and manufacturing, I am equally comfortable working as an individual and as part of a team. I aim to work closely with my clients to ensure the best possible solution is delivered. I am flexible with working hours and look forward to hearing from you to discuss any upcoming projects and requirements.

I’m a senior software engineer with 15+ years of experience in the design and development of enterprise-grade applications, libraries, and tools. My core expertise spans API design and integration (OpenAPI/Swagger/JSON Schema), REST and microservices architectures, OSS development, IoT integration, and Java-based enterprise systems. I have extensive experience leading geographically distributed teams and delivering projects across diverse technology stacks and business domains. Over the past decade, I’ve been a lead maintainer and contributor to several key Swagger and OpenAPI OSS projects, including Swagger Core (30M+ monthly downloads on Sonatype), Swagger Parser, Swagger Codegen, and ApiDOM. I’ve helped evolve these from early-stage codebases into production-ready components widely adopted in both open-source and commercial products, including by major companies. I played a key role in the growth of Swagger/OpenAPI-based commercial platforms, driving architecture and implementation for code generation, SCM and cloud integrations, parsing, validation and plugin frameworks — from concept to profitable SaaS offerings. I'm deeply familiar with the full lifecycle of web and API-driven platforms and integration layers, including protocol implementations and de facto standards. I have also developed and maintained complex systems in varied environments, adjusting architecture and delivery based on constraints, teams, and performance needs. I actively explore AI and agentic technologies and already leverage them in my development workflows. I'm progressively adapting and tuning them to fit API-centric and developer tooling domains — stay tuned. For a sample of my work, see GitHub: frantuma Recent Focus Areas: * Deep API architecture: OpenAPI 2 → 3.2, JSON Schema, AsyncAPI * High-performance Java backends: Spring Boot, JAX-RS/Jakarta, microservices * Developer tooling: Specification and code representation, parsing, validation, transformation, rich editing, integration * Integration: Making systems talk to each other—OpenAPI, REST, APIs, GitHub, Cloud, IoT, TypeScript, Java Services Offered: * API & Platform Consulting: Design-first and code-first approaches, integration, cloud, versioning, generation, linting, rules * Custom Java & TypeScript Development: From greenfield services to deep refactoring and performance optimization * Integration & DevOps: GitHub Actions, Maven Central, Nexus, Docker, AWS IaC * Developer Tooling: Custom language servers, schema validators, code generators * Technology Consulting: Strategic advice and tactical help, from architecture to implementation * Maintenance & Support: Hands-on assistance and issue resolution for complex systems Buzzwords & Stack: OpenAPI, Swagger, JSON Schema, REST, AsyncAPI, GraphQL, SOAP, XML, XSD, JSON Java, TypeScript, JavaScript, Python, Kotlin, Scala, Bash Spring, Spring Boot, JAX-RS, Jakarta, Tomcat, JBoss, Jetty, Apache, NGINX Docker, AWS, Lambda, OSGi (Felix, ServiceMix), Mule ESB, Kafka, JMS, Hazelcast, ActiveMQ Databases: MongoDB, CouchDB, PostgreSQL, MySQL/MariaDB, Oracle, Derby CI/CD: Maven, Gradle, npm, Jenkins, GitHub Actions, Nexus, Bamboo IDE/Tools: IntelliJ, Eclipse, NetBeans, Git, SVN, GitHub, Bitbucket Workflow: SCRUM, Agile, JIRA, Confluence, UML, RSA Testing: JUnit, Mockito, Easymock, Selenium, JMeter, Flyway Android, IoT, Location Services, Google Maps Misc: Wordpress, PHP, Quartz, POI, Jackson, JasperReports, SSO, Facebook/Twitter APIs

Hello! I'm a passionate and dedicated freelance developer with over 20 years of experience in building robust web, enterprise, and mobile applications. My expertise spans across both front-end and back-end technologies, allowing me to deliver full-cycle development solutions tailored to your needs. I pride myself on my ability to communicate effectively and deliver projects on time and within budget. 𝗦𝗸𝗶𝗹𝗹𝘀 • Web Development Frameworks: React, Angular, Vue.js, Node.js • Backend Technologies: Python (Django, Flask), PHP (Laravel), Java Spring • Mobile Development: React Native, Flutter • Database Management: MySQL, MongoDB, PostgreSQL • Cloud Services: AWS, Azure, Google Cloud, Digital Ocean • DevOps: Docker, Kubernetes, CI/CD pipelines, GitHub Actions • CMS Expertise: WordPress, Shopify, Magento, WooCommerce • AI/ML: Machine Learning (scikit-learn, TensorFlow, PyTorch), Deep Learning, Natural Language Processing (NLP), Computer Vision, Large Language Models (LLMs) • SEO: Keyword Research, On-Page Optimization, Off-Page Optimization, Technical SEO, SEO Auditing, SEO Analytics, Search Console, Google Analytics • QA: Test Automation (Selenium, Cypress, Appium), Functional Testing, Regression Testing, Performance Testing, API Testing, Usability Testing, Test Planning, Defect Tracking, Agile Testing Methodologies • Technical Project Management: Agile Methodologies (Scrum, Kanban), Waterfall, Risk Management, Project Planning, Project Scheduling, Budget Management, Stakeholder Management • Business Analysis: User Stories, Use Cases, Business Process Modeling/Redesign, Data Flow Diagrams, Prototyping, Stakeholder Interviews, Workshops, Requirements Documentation 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗢𝗳𝗳𝗲𝗿𝗲𝗱 • Custom Web Application Development • E-commerce Solutions • AI-Powered Solutions • API Development and Integration • Website Redesign and Optimization • Performance Tuning and Security Enhancements • Agile Project Management and Scrum Master Services • QA Services • Business Analysis • SEO Audits and Optimization • Ongoing Maintenance and Support 𝗪𝗼𝗿𝗸 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 Freelance Developer | Upwork | 2016 – Present • Successfully completed over 50 projects, ranging from small business websites to complex web applications. • Developed a custom e-commerce platform using React and Node.js that increased client sales by 30%. • Integrated third-party APIs for payment processing and shipping solutions. • Developed and deployed a machine learning model to predict customer churn for a SaaS client, resulting in a 15% reduction in churn rate. 𝗖𝗲𝗿𝘁𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 • AWS Certified Solutions Architect • Google Cloud Professional Developer • Oracle Certified Java Programmer • IREB Certified Requirements Engineer • Certified Scrum Master 𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 I am available for both short-term projects and long-term collaborations. My typical working hours are flexible to accommodate different time zones. Let’s discuss how I can help you achieve your project goals! Feel free to reach out for a consultation or to discuss your specific requirements.