Hire the best Java Developers in Wisconsin
Check out Java Developers in Wisconsin with the skills you need for your next job.
- $90 hourly
- 5.0/5
- (3 jobs)
I love technology and learning new languages, frameworks and platforms. I've been an I.T. professional for 25 years and was a computer enthusiast/programmer before I made it a career. I have worked as a consultant on many large & complex projects at Fortune 500 companies. Although my experience has been large corporate systems (ERP, e.g. Oracle PeopleSoft), I have found that I want to be more involved in startup projects using modern tools and techniques. To keep current with technology trends, I often work on side projects, some of which never see the light of day and others that have a significant user base on the public web.Java
Linux System AdministrationPeopleCodeAmazon Web ServicesMySQLVue.jsGrailsSQLApache GroovyjQuery - $60 hourly
- 5.0/5
- (3 jobs)
ABOUT ME: I am Lead Data Engineer with strong software development background. I have over 10 years of professional experience in IT, 7 years of which in Data Engineering. I have MS in Software Engineering from DePaul University (Chicago, IL USA) WHAT I CAN DO FOR YOU: Having worked as a Lead Data Engineer in Fortune 500 big enterprises, I can help startups with with *developing comprehensive data governance and security strategies, *designing and implementing cloud data platforms (Azure, AWS, Databricks) * data warehouse modelling * data lake/data lakehouse modelling *cost optimization of data and ML pipelines *performance optimization of data and ML pipelines TECHNICAL SKILLS Python| Java| Scala| PySpark| Apache Spark| Apache Airflow| Databricks| AWS| Azure| AWS EMR| AWS GLUE | Azure Datafactory | Azure SynapseJava
Jakarta EEAndroid SDKAndroid App DevelopmentData LakeData ModelingAmazon Web ServicesMicrosoft AzureAWS LambdaAWS GluePySparkETLData EngineeringMachine LearningApache SparkDatabricks PlatformSQLPython - $50 hourly
- 5.0/5
- (14 jobs)
I am a highly experienced Full-Stack Engineer with 10+ years of expertise in designing, developing, and deploying scalable, high-performance web applications. I specialize in building robust, secure, and efficient solutions using modern front-end and back-end technologies. With a strong foundation in software architecture, cloud computing, and API development, I ensure that every project is built for scalability, maintainability, and optimal performance. I thrive in collaborative environments, solving complex technical challenges while delivering high-quality, production-ready applications. ⸻ 💡 What I Bring to the Table: ✔ Proven expertise in full-stack development with a focus on performance, security, and scalability. ✔ Strong problem-solving skills, delivering efficient, maintainable, and well-structured code. ✔ Hands-on experience with modern front-end frameworks, back-end development, and cloud infrastructure. ✔ Deep understanding of system design, CI/CD pipelines, and DevOps best practices. ✔ Passion for continuous learning and staying updated with the latest technologies. ⸻ ⚙️ Tech Stack & Expertise 🖥️ Frontend Development: ✅ React, Next.js, Redux (Toolkit, Saga, Thunk), Context API ✅ Angular.js, Angular 2+, RxJS, Vue.js, Vuex, Nuxt.js ✅ HTML, CSS, SCSS, JavaScript (ES6+), TypeScript ✅ Material UI, Tailwind CSS, Ant Design, Bootstrap, Semantic UI ✅ Webpack, Babel, Gulp, Grunt 🖥️ Backend Development: ✅ Node.js, Express, Nest.js, Koa, Loopback ✅ Python, Flask, Django, Fast API ✅ Java, Spring Boot, Hibernate ✅ C#, ASP.NET Core, Entity Framework 📡 API Development & Databases: ✅ RESTful APIs, GraphQL (Apollo, Relay), WebSockets ✅ MySQL, PostgreSQL, MongoDB, Firebase Firestore, BigQuery ✅ Elasticsearch, Redis, RabbitMQ ☁️ Cloud & DevOps: ✅ AWS (Lambda, EC2, S3, RDS, CloudFront, DynamoDB, Cognito) ✅ Google Cloud Platform (GCP), Azure, Heroku, Firebase, Vercel ✅ CI/CD, Docker, Kubernetes, Terraform, GitHub Actions, Jenkins ⸻ 📢 Let’s Work Together! I am currently open to new opportunities and looking for challenging full-stack projects where I can apply my expertise in modern web development, cloud infrastructure, and API architecture. If you need a reliable, skilled, and innovative developer, feel free to reach out anytime. Let’s build something amazing together. 🚀Java
FlaskExpressJSNext.jsC#ReduxTypeScriptDjangoNode.jsPythonCSSReactJavaScriptAngularHTML - $50 hourly
- 5.0/5
- (4 jobs)
Hello my name is Brandon Ellenberger. I have been in software development over the last 15 years. Throughout that time I have worn many hats in the software development lifecycle (requirements , system & database design, programming, implementation, etc.) I have experience with: - .NET - C# - VB.NET - ASP.NET / MVC - PHP - Java - JavaScript - HTML - SQL I have a BS in Computer Science from the University of Wisconsin - Madison and a MS in Computer Science from the University of Wisconsin - Milwaukee where I did work with AI. I am passionate about software development and enjoy the challenge of finding a solution to what a user wants in an application. I look forward discussing your project together.Java
ASP.NET Core.NET CoreSQLWeb Development.NET FrameworkC#Desktop Application - $50 hourly
- 5.0/5
- (8 jobs)
I’m a Business Analyst, proficient with analyzing large data sets and creating useful visualizations. I’m experienced with PowerBI, SQL Server, Databricks, and Microsoft Excel with familiarity in the Python scripting. I excel at meeting deadlines and exceeding requirements - I would be happy to join you for your next project!Java
IT Project ManagementQA TestingSpreadsheet SkillsMicrosoft Excel PowerPivotVLOOKUPProject ManagementDatabase Management SystemMicrosoft OfficePython ScriptMicrosoft ExcelMicrosoft Power BISQLData Analytics - $35 hourly
- 5.0/5
- (7 jobs)
I am a highly skilled full-stack web developer with over 5 years of experience, specializing in the MERN stack (MongoDB, Express, React, and Node.js), and modern frameworks like Next.js. I’ve built scalable, secure, and fast web applications for clients across industries such as e-commerce, SaaS, and service-based businesses. ✅ What I Bring to the Table: Frontend: React.js, Next.js (v14/15 App Router), Tailwind CSS, Framer Motion, Shadcn, and MUI Backend: Node.js, Express.js, MongoDB, PostgreSQL, REST APIs, and GraphQL CMS Expertise: Headless CMS integration with Sanity.io, Prismic, and Payload CMS, giving clients full control over content with user-friendly dashboards E-Commerce: Stripe payment integration, dynamic product listings, and order workflows SEO & Performance: Lighthouse-optimized pages, server-side rendering (SSR), and static generation DevOps: Vercel, Netlify, GitHub, CI/CD, Supabase, Firebase 🧠 Soft Skills: Clear, timely communication Agile development workflows Detailed documentation and post-launch support Experience working both solo and in collaborative teams 🎓 Credentials: Bachelor's Degree in Computer Science Software Engineering & Full-Stack Development Bootcamps If you're looking for someone who can build it right the first time—from elegant UIs to powerful backends and scalable CMS integration—I’m here to help. Let’s build something great together!Java
TypeScriptC++SQLHTMLJoomlaJavaScriptCSSDrupalWebsiteResponsive DesignPHP - $50 hourly
- 4.2/5
- (2 jobs)
I have worked as a full stack web developer for 3 years and I am experienced in managing installations for multiple clients at once. I use my interests in video game design to bring a unique approach to the projects I am working on. - I am experienced with HTML, JavaScript, Node.js, PHP and Express to create stylish frontend applications. - I am experienced using PHP and Java along with MySQL to create sophisticated backend functionality. - Communication is important to me so I can help bring your project to fruition.Java
Object-Oriented ProgrammingAPITestingDatabaseHTMLReactCodeIgniterMySQLNode.jsJavaScriptPHPWeb ApplicationExpressJS - $50 hourly
- 0.0/5
- (0 jobs)
I'm a full stack developer with experience building websites and web applications. I have participated in the entire software development lifecycle from managing epics and user stories in Jira to testing the final product; I believe in test/behavior driven development. I've written technical specifications to break features into iterative milestones with estimated timelines and tradeoff considerations between the design team and product owner.Java
Front-End DevelopmentJiraGoogle Cloud PlatformHTMLPostgreSQLSQLReactTypeScriptJavaScriptGraphQLMongoDBAmazon Web ServicesCSSGit - $45 hourly
- 0.0/5
- (1 job)
I am an experienced Odoo developer, ERP consultant, and custom application developer with expertise in TypeScript, PHP (Magento, WordPress), React, and Java (Spring Boot). I provide tailored solutions to optimize business processes, enhance productivity, and deliver long-term value. Whether you're looking to customize Odoo, develop custom applications, or integrate systems, I can help. Odoo Services: - Odoo Development & Customization: Modify or build custom features. - Odoo Implementation: Smooth setup, migration, and configuration. - Odoo Integration: Connect Odoo with third-party apps, CRMs, and payment systems. - Odoo ERP Consulting: Optimize business operations, from sales to HR. - Odoo eCommerce Setup: Configure your online store with custom payment and shipping solutions. - Odoo Inventory Management: Efficiently manage stock and warehouse operations. - Odoo Support & Maintenance: Ongoing technical support and updates. Custom Application Development: - Full-Stack Development: Build responsive web apps with React (front-end) and Java (Spring Boot) (back-end). - Electron App Development: Cross-platform desktop apps for business tools. - Java and Spring Boot Development: Secure, scalable back-end systems and APIs. - React-Based Front-End Solutions: Dynamic interfaces that boost user engagement. - Code Generation Tools: Automate repetitive coding tasks for productivity. - Integration & API Development: Seamlessly connect and integrate systems. Let's work together to unlock your business's full potential with Odoo and custom application solutions!Java
FlutterOdoo AdministrationC++Vue.jsReactGolangPHPWordPressNode.jsMicroserviceJavaScriptPythonOdoo DevelopmentOdoo - $20 hourly
- 5.0/5
- (2 jobs)
I'm a game developer with a deep love of building rich and emergent systems. I'm very comfortable doing both programming and design, and I'm here to help you make your game dev dreams a reality! I'm a strong generalist, with the ability to deliver - Unity3D or Godot - 2D or 3D - Single player or multiplayer Reach out and lets talk! Note: Consider my current rate an introductory rate as I'm new to the platform. Take full advantage and you won't be disappointed!Java
Level DesignMicrosoft Windows PowerShellComputer GraphicsGame DevelopmentGame DesignGame PrototypeCC++C#PythonUnity - $45 hourly
- 0.0/5
- (0 jobs)
I am a computer science and finance double major at the University of Wisconsin - Madison interested in financial software development. I also enjoy designing, prototyping, and building user interfaces and experiences. I also have experience producing and editing educational videos, creating graphics and animations, and audio editing.Java
NotionAudio EditingVideo ProductionCamtasiaReactMicrosoft ExcelFigmaSQLCSSHTML.NET FrameworkGitJavaScriptPython - $28 hourly
- 5.0/5
- (0 jobs)
Summary Software engineering leader with 13 years of experience developing, managing, and innovating backend systems. Led the re-architecture of a critical platform that serves over a million requests monthly, improving accuracy by 25 percent. Collaborated on a project with Google Inc. and completed the project two months before the delivery date, which awarded the company with a one-million-dollar bonus. Promoted two times in 18 months, six months ahead of schedule.Java
Problem SolvingCross Functional Team LeadershipAzure DevOpsJiraPythonJavaScriptInformation TechnologyLeadership SkillsTeam AlignmentTeam ManagementSoftware DevelopmentMicrosoft Power AutomateManagement SkillsProject Management - $48 hourly
- 0.0/5
- (0 jobs)
I'm a full-Stack software engineer with 2.5 years of professional experience. I have created software from the ground up, been apart of facilitating organizational transition to microservices architecture, and everything in-between. From helping create your dream website, to improving existing services and projects, I'm here to help - My tech stack includes Springboot (Java), Angular, SQL & NoSQL Databases, and some Python and C - Love to communicate & hit targets, so let's keep in touch and accomplish greatnessJava
CSSHTMLTypeScriptPythonTestingNoSQL DatabaseSQLSoftware DevelopmentSoftware ConsultationSoftware DebuggingDatabaseMicroserviceAngular 10Angular - $75 hourly
- 0.0/5
- (0 jobs)
SUMMARY Full-stack developer with over a decade of experience delivering scalable, user-focused solutions across both front-end and back-end. Proficient in Python, Java, and JavaScript, I excel at designing and implementing APIs (REST or otherwise) while leveraging modern frameworks such as React, Angular, and TypeScript to build intuitive interfaces. My skillset and experience span containerization (Docker, Kubernetes), cloud infrastructure (Azure, AWS, GCP) and DevOps (Jenkins, Terraform, Azure DevOps) tools and practices, enabling me to create robust, maintainable systems. I'm passionate about writing clean, well documented code that meets both business objectives and user needs, and I thrive on continuously learning new tools and methodologies to deliver impactful results. * Excel at Python, JavaScript/TypeScript and Java-based microservice applications (Java Spring, Spring Boot) * I do not sell you what you do not need -- I will provide solutions that are financially sustainable and helpful to you, not me * I have considerable experience working with Personally-Identifiable Health Information (PHI) and HIPAA-protected data. I have experience auditing software for HiTrust compliance As I am new to the upwork platform, I am offering a discounted rate ($42/hr) until June 21st!Java
DjangoSQLWeb App Penetration TestingData Analytics & Visualization SoftwareCloud ArchitectureData EngineeringHighchartsjQueryTypeScriptMicroserviceKubernetesWeb ApplicationMongoDBPython - $75 hourly
- 0.0/5
- (0 jobs)
Curiosity fuels my work: I architect systems where innovation meets reliability. As CTO and founding engineer at a small company, I architected a SaaS loan origination platform from the ground up, leveraging Java (Spring Boot), PostgreSQL, ElasticSearch, RabbitMQ, and Angular to deliver secure, real-time solutions that streamlined complex lender workflows, accelerated data-driven decisions, and enhanced operational accountability—transforming how lending teams scale. Behind the scenes, I orchestrated resilient infrastructure: Kubernetes (AKS) for microservice scalability, Istio for zero-trust service communication, and ArgoCD/Ansible for GitOps-driven pipelines—all hardened by Lynis audits and mod_security WAF to ensure airtight security as the business grew. Key Expertise: - Full-Stack Development: Java, Spring Boot, Angular, Bootstrap (customer-facing UX) - Cloud Infrastructure: Azure, AKS, Istio (secure, scalable orchestration) - Automation & Security: Ansible, ArgoCD, Lynis, WAF/mod_security - SaaS Growth: Scaled platforms end-to-end (architecture → adoption) What Drives Me: - Turning “impossible” infrastructure puzzles into elegant systems - Future-proofing tech stacks with tools that simplify complexity - Bridging precision engineering with user-centric design I don’t just build software—I build trust through robust, scalable solutions.Java
LinuxNGINXRabbitMQMicrosoft AzureAnsibleSystem AdministrationWeb DevelopmentComputing & NetworkingBootstrapAngularPostgreSQLSpring BootKubernetesDevOps - $60 hourly
- 0.0/5
- (0 jobs)
Senior Software Engineer with a focus on back-end development, cloud infrastructure (AWS), and IoT platforms. I build scalable, high-performance systems using microservices and real-time data solutions. Known for optimizing operations, mentoring teams, and driving impactful results through a proactive, solutions-oriented approach. Passionate about learning, innovation, and continuous improvement.Java
NodeJS FrameworkSpring CloudSpring BootExpressJSAmazon RDSAmazon DynamoDBMongoDBMySQLJavaScriptMicroserviceAPI DevelopmentAWS CloudFrontAWS CloudFormationAWS Fargate - $100 hourly
- 0.0/5
- (0 jobs)
🚀Who We Are A top-tier economics and data consulting firm delivering strategic, tech-enabled solutions to clients in finance, policy, and development—with affordability and impact at the core. 💼 What We Do 📊 Econometric Expertise: Cross-sectional, panel data, and time series modeling for evidence-based insights 💸 Financial & Market Consulting: Forecasting, risk analysis, investment strategy, and regulatory evaluation 🤖 Machine Learning & AI: Applied ML models for prediction, classification, and decision optimization 🛠 Custom Software Development: Affordable, scalable data tools and analytics platforms built for business needs 📈 Policy & Program Evaluation: Rigorous, data-driven assessments for governments, nonprofits, and think tanks 👥 Who’s Behind It 🎓 A researcher from Stanford University 💻 A software engineer at a leading financial trading firm 🧠 Experts in machine learning, deep learning, and econometrics 📣 Why Clients Choose Us We combine academic depth with industry execution—turning complex data into practical solutions that move organizations forward.Java
SQLStatistical AnalysisJavaScriptStataC++RPythonGISSpatial AnalysisTime Series AnalysisEconometricsData AnalysisMachine LearningData Mining - $20 hourly
- 5.0/5
- (15 jobs)
I am a Senior Application Development Engineer with a BS degree in Software Engineering. I am a self-driven, tech savvy professional that excels in Google Sheets scripting, Data Entry, and Virtual Assistant tasks. I also am a SkySpark developer and am fluent in Axon and Fantom languages. Due to my education and wide variety of work experience, I have become a very detail oriented, dependable, and hard-working individual. I value communication and pride myself on providing job updates as much, and as necessary, as possible. I will not complete a task until I've met all the requirements and have exceeded expectations. Please contact me if seeking assistance in any relevant project you have! Even if it is a simple question, don't hesitate to reach out as I'm willing to help in any way possible!Java
Data AnalyticsVirtual AssistanceMarket ResearchData EntryGoogle SheetsMicrosoft ExcelWordPressHTML - $75 hourly
- 0.0/5
- (0 jobs)
My Specialties are: *Building technical software and data solutions that fit your business needs. *Fluent in a variety of computer languages and technologies. We can find a combination that will work for you whether you have a one-time need, or multiple add-on projects planned. *Helping with the entire software life cycle from design to implementation whether your project is small or large. *Analyzing your data to help generate more business for you! *Writing requirements and technical documentation so that everyone has a solid understanding of the work in plain English. Thanks, and I look forward to working with you! Tony Stroessenreuther ---------------------------------------------------------Java
Relational DatabaseSQL ProgrammingSASNoSQL DatabaseRESTful ArchitectureSOAPWeb ServiceUnix ShellMongoDBSQLC++WordPress - $15 hourly
- 0.0/5
- (0 jobs)
I graduated from University of Wisconsin-Parkside in December 2015 with a degree in Computer Science. I have studied a broad range of topics within Computer Science including Database Management Systems, Web Security, Web Design, Distributed Systems, Computer Graphics, Computer Architecture, Mobile Device Programming and Software Engineering. I have experience developing software for multiple platforms using different types of technology. I'm also familiar with using traditional waterfall and agile methods of software development including SCRUM.Java
AndroidComputer ScienceDatabaseASPWeb ServiceC++C#SQL - $15 hourly
- 0.0/5
- (0 jobs)
Hi! I'm Trever — a Discord bot developer with experience building custom bots for moderation, automation, server engagement, mini-games, and API integrations. Whether you're running a gaming community, a content creator server, or a private group, I can build a bot that makes your server easier to manage and more fun to use. What I can help you with: ✅ Custom commands (slash commands, buttons, embeds) ✅ Moderation features (kick, ban, mute, warnings) ✅ Role systems and reaction roles ✅ Auto-posting (e.g., YouTube/Twitch announcements) ✅ Fun games, mini-economies, or giveaways ✅ API integrations (weather, crypto, etc.) ✅ Bot setup and 24/7 hosting guidance I write clean, reliable Python code using discord.py (or Java if preferred), and I prioritize clear communication and fast turnaround. Let’s work together! Send me a message with your idea and I’ll help you bring it to life 🚀Java
REST APIGitEvent-Driven ProgrammingDiscordAPI IntegrationWebsocketsDiscord Bot DevelopmentPython - $50 hourly
- 0.0/5
- (0 jobs)
Summary of Qualifications * Fullstack software engineer comfortable in all areas including Frontend, Backend, and Database * Software Languages: C#, Java, SQL, Typescript, HTML, CSS, Git, Angular and Node.js * Efficient with software such as Microsoft Visual Studio, Eclipse, Windows Desktop and Server, Linux, SQL Management Server, and a variety of Oracle enterprise applications. * Self-driven and able to learn new programming concepts and languages quicklyJava
Microsoft Windows PowerShellBash.NET CoreSoftwarePostgreSQLHTMLCSS 3TypeScriptC#AngularSQL - $30 hourly
- 0.0/5
- (0 jobs)
I have a master's in Electrical Engineering and a double bachelor's in Computer Science and Electrical Eng. Tech. with a minor in mathematics. I worked at Honeywell as a portal developer for almost two years. The portal is a Meter Data Management (MDM) system that is designed using Django. I also worked on a system that is designed in Django with Ext JS (Sencha) front-end, that helps utilities detect power theft. I previously worked as a sub-system engineer student employee at John Deere where I did both hardware and software testing. I also worked as a Senior Drupal Developer at the University of Northern Iowa. I built department websites and used PHP to create standardized features and modules in Drupal that are used across campus. I have excellent communication and writing skills. I always maintain a professional manner when communicating with people. I'm an excellent team player. My versatility and experience make me an excellent candidate for this position.Java
MATLABWeb DevelopmentNumPypandasJavaScriptDjangoPythonGit - $20 hourly
- 0.0/5
- (1 job)
I'm a Software Engineer experienced with multiple programming languages including Java, C#, C++, and Python. I have worked with teams utilizing different software development methodologies such as Agile and Scrum.Java
OpenGLLinuxGitSQLPythonC++C# - $18 hourly
- 0.0/5
- (0 jobs)
PROJECTS Personal Note-Taking Website * Developed a full-stack web application using Spring Framework, Spring MVC, MySQL, and Redis. * Implemented features such as note CRUD, file transfer, user authentication, and IP-based access control. * Deployed the application on Google Cloud with Nginx as a reverse proxy server. Java Bookstore Web Application * Created a bookstore management system allowing admins to handle inventory and users to buy books. * Integrated backend services with frontend interfaces using TomCat, JDBC, Druid, Thymeleaf, and Vue.js. COURSEWORK (full details available on my note-taking website ) Programming: CS300, CS400 AI Intro: CS540 Data Modeling: Stat240, Stat340 Data Structures and Algorithms: CS577 Computer Engineering and C: CS254, CS354Java
NGINXGitDockerLinuxMyBatisRedisMySQLSpring Boot - $25 hourly
- 0.0/5
- (1 job)
I'm in college studying software engineering with 3+ years of experience, specializing in building web applications. Currently focused on React, HTML, Javascript, TypeScript, and Python. Background With over 3 years coding, I've developed a deep passion for creating elegant solutions to complex problems. My journey began with a fascination for technology and has evolved into a career focused on building modern, user-centric applications. Philosophy I believe in writing clean, maintainable code that solves real problems. My approach combines technical excellence with a strong focus on user experience, ensuring that every project I work on delivers both functionality and value. Interests Outside of coding, I'm passionate about open source contribution, mentoring other developers, and staying current with emerging technologies. Excited for any opportunities in my way!Java
CVue.jsSupabaseReactTypeScriptJavaScript - $22 hourly
- 0.0/5
- (0 jobs)
I’m an aspiring software engineer with a strong foundation in full-stack development, backend systems, and system-level programming. While I’m still early in my professional journey, I’ve already built projects I’m proud of — from test-driven Java applications to responsive Node.js web tools and performance-focused C simulations. I’m eager to take on real-world challenges and continue growing with every project I work on. Proficient in Java, C, JavaScript, Node.js, MongoDB, and RESTful APIs Hands-on experience with TestNG, Gradle, GitLab CI/CD, and custom Makefile systems Comfortable working independently or collaborating in Agile teams Focused on writing clean, maintainable code with solid test coverage and memory safety I bring energy, curiosity, and a strong work ethic to every project — and I’m excited to learn from clients while helping them build great software. Let’s get started!Java
GradleReactJavaScriptJavaFXJava GUIProduct DevelopmentDesktop ApplicationPersonal ComputerSoftware DevelopmentWeb ApplicationWeb Development Want to browse more freelancers?
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