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Rating is 4.8 out of 5.
4.8/5
Based on 895 client reviews
Jeffrey P.

Kings County, New York

$80/hr
4.5
15 jobs

I bring over 25 years of experience in the software development industry, backed by a degree in computer science and a deep commitment to crafting high-quality software. Throughout my career, I have had the privilege of contributing to a diverse range of high-tech companies across various industries. My professional journey includes roles at prominent organizations such as Condé Nast Publications, HBO, Cigna Healthcare, Citigroup, Cisco, Capital One, as well as several startups. My technical expertise spans a broad spectrum, including proficiency in Java, Go, Node, Angular, and numerous other technologies and programming languages.

  • Java
  • HTML
  • Node.js
  • React
  • Docker
  • Kubernetes
  • Amazon Web Services
  • Golang
  • AngularJS
  • Angular
  • Terraform
  • Android
Shivani V.

Irving, Texas

$50/hr
5.0
41 jobs

With 5+ years of professional experience in software (website, front-end, back-end, web app) development with a diverse background spanning multiple industries and roles. Throughout my career, I've demonstrated proficiency in full-stack development, system integration, and project management. My diverse experiences have equipped me with a unique skill set to tackle complex challenges and deliver innovative solutions. Technical Proficiencies: Website Technologies: Shpoify, WordPress Frontend Technologies: React, React Native, Flutter, HTML, CSS Backend Technologies: Node.js, Nest.js, TypeScript, JavaScript, Express.js, AWS, MongoDB Database Management: MySQL, PostgreSQL, JSON, Database Schema Design Architectural Patterns: MVC, Event-Driven Architecture, Serverless Architecture, Clean Architecture, GraphQL Mobile Development: iOS SDK, Swift, Objective C, Apple XCode, Android SDK, Kotlin, Java Android Studio Mobile Libraries & APIs: Alamofire, SDWebImage, Cocoapods, SQLite, Core Data Web Services & APIs: RESTful API development, Firebase Cloud Messaging, In-App Purchase Integration Code Optimization: Performance tuning, Design patterns, Material Design, Custom UI Elements, Animation Cloud Services: Firebase Analytics, Database, Storage, Hosting, Crash Reporting, AWS, DigitalOcean Social Integrations: Facebook, Twitter, Google SDK Additional Skills: Web Scraping, Image Processing, Deep Linking, Content Provider, BroadcastReceiver, Background Services Tools: Git, Github, Bitbucket, Sketch, Photoshop ----------------------------------------------------- Full Stack Development Expert, Front-end Developer, Back-end Developer, Web App Development, Mobile App Development, React, React.js, Node.js, Nest.js, Nuxt.js, Express.jsJavascript, Typescript, HTML, CSS, CSS3, PHP, Python, API Development, API Integration, RESTful API, Third-Party SDK Integration, Firebase, Firebase Firestore, Analytics, Crashlytics, Cloud Services, AWS, Amazon Web Services, Database Design, Database Management, Mobile App Development, Native App Development, Android Mobile App Development, iOS Mobile App Development, Cross-Platform Mobile App Development, Flutter Mobile App Development, Dart, Java, Kotlin, Swift, SwiftUI, ChatGPT API Integration, Web Development, Web Application, Website Redesign, Website Optimization, Database Development, OpenAI, Agile Software Development, Google Analytics, Google Cloud Platform, RESTful Architecture, Amazon DynamoDB, SQLite, MySQL, MongoDB, Realm Database, PostgreSQL, Firebase Realtime Database, Node.js Framework, Back-End Development, API, React, Front-End Development, Full-Stack Development

  • Java
  • Spring Boot
  • Web Development
  • React Native
  • React
  • Mobile App Development
  • Web Application Development
  • Front-End Development
  • Full-Stack Development
  • Back-End Development
  • UI/UX Prototyping
  • OpenAI API
  • AI App Development
  • AI Mobile App Development
  • ChatGPT API Integration
Vikram S.

Houston, Texas

$15/hr
5.0
3 jobs

Senior Java Developer with 10+ years of experience delivering, supporting, and enhancing complex, high-availability systems for Fortune 500 organizations. My core experience is Java (up to Java 17), Spring, and Spring Boot, with strong hands-on experience in modern DevOps practices, including Docker, CI/CD pipelines, and cloud platforms such as AWS. I’ve worked across the full software development lifecycle — from system design to implementation. Along with the back-end, I also have experience working on front-end technologies such as the Angular framework and TypeScript/JavaScript. I communicate clearly and have worked closely with product owners, business stakeholders, and cross-functional teams (Test/QA, DevOps, Production Support), including remote and distributed teams, to deliver reliable production systems. In addition, I bring deep domain experience in energy and financial trading platforms, including OpenLink Endur, Sungard (FIS) Nucleus, Sungard (FIS) Entegrate, TradeWeb, MarketAxess, Murex, Bloomberg Terminal, and the FIX Protocol. Front End JEE: HTML, CSS, Servlets, JSP, JavaScript, JQuery, TypeScript, Angular Back End JEE: Java, JDBC, JPA, Hibernate, Spring Data, EJB JEE Web Services: REST, SOAP, JSON, XML, OpenAPI, Swagger, GraphQL JEE Frameworks: Spring, Spring Boot, Spring MVC, Struts MVC JEE IDE/Build/Test: STS, Eclipse, Ant, Maven, Gradle, JUnit, Mockito, TDD Version Control: Git, GitHub, SVN, CVS Database: MySQL, Oracle, Sybase, SQL, PL/SQL, SQL Server DevOps: CI/CD, Travis CI, Jenkins, Docker, Kubernetes, Terraform AWS Cloud: EC2, IAM, S3, Lambda, CodeBuild, SDK v2, AppSync, ECS, EKS Microservices: Spring Cloud, Netflix Eureka, OpenFeign, DDD, Saga, Zipkin Messaging: Kafka, RabbitMQ, ActiveMQ Security: Spring Security, OAuth2, JWT, OpenID Connect, Keycloak AI Assistants: GitHub CoPilot, Claude, ChatGPT, Cursor, Gemini

  • Java
  • Spring Boot
  • Spring Framework
  • Microservice
  • Docker
  • Java Persistence API
  • REST API
  • AWS Lambda
  • Agile Project Management
  • J2EE
  • AWS CodeBuild
  • Financial Trading
  • Online Financial Trading
  • Angular
  • Amazon Web Services
  • Serverless Computing
Joseph D.

Kings County, New York

$85/hr
5.0
29 jobs

Upwork Certified in JavaScript backend (Node.js) development. I am an experienced programmer of consumer facing applications and services, with a background building in the arts, publishing, and education industries. I have been designing, developing, and assisting with software projects in a number of categories • Web and game development with HTML5/JavaScript (CreateJS, ZIM) • Mobile development with Flutter/Dart • Full stack development with Java EE • Greenfield development and restoration of function/forensic analysis and correction using AI agents (Claude Opus and Fable) I have also helped resurrect or restore control over a number of Java and JavaScript projects. If you find yourself facing a deadline, or need assistance untangling a codebase, please get in touch and we can talk about how get things running again. My projects have included: • Feature development and bug fixing for a real time, high-volume, sales-lead management platform (Java EE, JavaScript) • A TV/Film production prop iPhone app to simulate calls, texting, and VFX screens (AIR, Flutter) • JavaScript games for TV/Entertainment using CreateJS/EaselJS (GSAP) and ZIM (HTML5 Canvas) • The re-architecture and substantial coding and rework of a medical training program (JS) • The addition of key features to a StoryLine 360 product (PDF printing via JS) • A self-publishing photo album service with mobile page design, image manipulation, painting and sticker functions. Required 3rd party REST integration with other commercial services (AIR) • Archery scoring application for iOS, ranked as high as #16 in the Sports category (AIR) If you have a Java, JavaScript or Animate project that needs creation or work, it is likely that I can provide for you. Drop me a line and we’ll discuss what can be done.

  • Java
  • Adobe Photoshop
  • JavaScript
  • Dart
  • HTML5
  • Adobe Animate
  • ActionScript
  • Adobe AIR
  • Flutter
  • Adobe Illustrator
  • ECMAScript 6
  • Game Design
  • Game Development
Elena R.

Doylestown, Pennsylvania

$65/hr
5.0
4 jobs

❓❓❓ Need AI integration that won't collapse under HIPAA, an audit, or Monday-morning traffic? Let's start with an audit of your existing setup. Ready to start today! 🛠️ 20+ years of engineering compliance-grade systems across healthcare, finance, and life sciences for companies like McKesson, AstraZeneca, Boeing, and Comcast. Key numbers: 20+ years delivering enterprise software as a Full Stack Developer across healthcare and SaaS. 50+ AI integration projects completed as a Python AI Developer, including secure AI API integration for HIPAA-regulated healthcare platforms in role of Full stack developer. 10+ enterprise companies including McKesson, AstraZeneca, Boeing, and Comcast supported as an AI Developer, ai backend developer, and AI integration expert. 50+ successful AI integrations delivered that have passed enterprise compliance audits. 50+ compliant production platforms launched through production-focused AI development, Python AI Developer expertise, and scalable AI SaaS development. 6+ core payer workflows including prior authorization, utilization management, claims processing, denials management, risk adjustment, and care management delivered through enterprise AI integration. 30+ healthcare and medical platforms delivered with HIPAA compliance, CMS requirements, and secure AI API integration align AI capabilities with regulated healthcare systems connecting payers, providers, and clinical data. 10+ pharma and clinical technology companies supported where AI powers clinical trials, pharmacovigilance, regulatory workflows, medical documentation, and real-world evidence platforms. 20+ years building complete AI-powered platforms as a Full Stack Developer healthcare, delivering backend systems, APIs, automation workflows, and scalable applications instead of isolated AI features. 10+ AI enterprise healthcare solutions connected with McKesson Health Solutions, AstraZeneca, Boeing, and Comcast as a Full Stack Developer Healthcare and Python AI Developer. 50+ production AI solutions designed and deployed through enterprise AI development, delivering secure, scalable, and audit-ready systems across healthcare and regulated SaaS environments. Whether you need an AI Developer, Full Stack Developer Healthcare, ai backend developer, or expertise in AI API integration or ai integration specialist , I can help guide the next steps. 🏆Technical Focus My work as an AI Developer includes AI integration projects, AI architecture improvements, automation systems, and intelligent workflows. I help teams move from ideas to production through practical AI implementation. As a Python Full Stack Developer, I create backend systems, APIs, web applications, and scalable platforms. I work with flask and django solutions when businesses need reliable Full Stack Developer Healthcare service. My experience as an AI developer includes natural language processing applications, AI-powered automation, and machine learning projects. I build ai integration strategies, ai integration specialist solutions, and ai integration workflows that connect technology with business goals. I support organizations with web developer, web application developer, and Ai backend developer expertise for modern SaaS products. My focus includes app developer with ai, ai saas development, ai development, and ai machine learning solutions. 🤖 AI Developer / PM and CEO of - Kombocode Founder & CEO of Kombocode, I help companies build production-ready AI products, SaaS platforms, healthcare systems, and enterprise applications. As an AI Consultant, I work with technology teams that need AI strategy, api integration, and practical implementation. I help businesses create AI solutions that solve real challenges. My work with a Python Full Stack Developer includes building scalable applications, backend platforms, APIs, and intelligent software products. I support companies looking for a Full Stack Developer Healthcare who understands both product development and AI engineering. I deliver AI API integration projects that connect AI models, software platforms, and business workflows. My experience includes AI integration and api integrations for companies modernizing their technology ecosystems. As an AI developer, I helped implement generative AI applications, automation workflows, and natural language processing capabilities for 10 enterprise companies. Kombocode service includes python full stack developer flask solutions and python full stack developer django. I work as a ai backend developer helping companies create AI-powered systems and intelligent automation. My expertise includes ai api solutions and AI development. I build solutions as a backend developer and ai backend developer and ai integration specialist, creating secure platforms, APIs, dashboards, and scalable software products. I support web developer initiatives focused on SaaS applications and digital transformation. 21/08/2026

  • Java
  • JavaScript
  • CSS
  • Web Design
  • PHP
  • Artificial Intelligence
  • AI Model Integration
  • Machine Learning
  • Node.js
  • React
  • Natural Language Processing
  • API
  • API Integration
  • Deep Learning
  • Django
  • Data Science
  • TensorFlow
  • Healthcare
  • Data Analysis
  • Computer Vision
Hamza K.

Clementon, New Jersey

$60/hr
5.0
4 jobs

I'm a Senior Backend and Data Engineer with 8+ years building production systems for 𝗝𝗣𝗠𝗼𝗿𝗴𝗮𝗻 𝗖𝗵𝗮𝘀𝗲, 𝗙𝗼𝗿𝗱 𝗠𝗼𝘁𝗼𝗿 𝗖𝗼𝗺𝗽𝗮𝗻𝘆, 𝗝𝗲𝘁𝗕𝗹𝘂𝗲, 𝗮𝗻𝗱 𝗘𝗹𝘀𝗲𝘃𝗶𝗲𝗿 across backend services, cloud infrastructure, and large-scale data pipelines. I work across the full stack of a modern data platform: I can build the Spring Boot service, the ETL pipeline feeding it, and the GCP/AWS infrastructure it runs on, and I understand how those pieces are meant to work together. 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: Spring Boot, Java (8 → 17), microservices, REST APIs, Spring Security/OAuth2/JWT. At JPMorgan I designed Spring Boot/JMS MQ microservices for real-time credit pull automation and migrated monolithic applications to microservices, cutting deployment time and improving modularity. As a Senior Backend Engineer on a JetBlue engagement, I built backend APIs consumed by mobile applications for flight booking and seat map functionality. I also build Python services (FastAPI) and Node/TypeScript backend APIs. 𝗗𝗮𝘁𝗮 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 & 𝗘𝗧𝗟/𝗘𝗟𝗧: Apache Beam, Spark, Hadoop, Databricks, dbt, Kafka. At Ford, I modernized the daily DMS-to-Ford data sync, replaced a 6+ hour batch job with a GCP Dataflow pipeline that runs in under 10 minutes. At Mphasis, I moved slow SQL Server stored procedures into Spark and Hadoop for a major performance gain. At Elsevier, I built a Kafka/Debezium streaming pipeline with Spring Cloud Dataflow to transform book content into PDFs in real time. 𝗖𝗹𝗼𝘂𝗱 𝗜𝗻𝗳𝗿𝗮𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲 (𝗚𝗖𝗣, 𝗔𝗪𝗦, 𝗔𝘇𝘂𝗿𝗲): Cloud Run, Dataflow, Kubernetes (GKE), Terraform, Lambda, API Gateway, ECS/EKS, DynamoDB, S3, RDS. I've built serverless applications, automated deployments through GitHub Actions and Jenkins, and provisioned infrastructure as code with Terraform/CloudFormation. I'm comfortable across the GCP ecosystem end to end, not just individual services in isolation. 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: PostgreSQL, MongoDB, SQL Server, DB2, COSMOS. JDBC, Hibernate, JPA, and direct integration work on both transactional and analytical workloads. 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 𝗼𝘄𝗻𝗲𝗿𝘀𝗵𝗶𝗽: I've taken over systems I didn't build more than once, including a Ford data-sync pipeline where I traced undocumented logic, caught a case where duplicate records were being silently persisted into production tables, and fixed the sync process before making further changes. If you need someone who can own backend services, the data pipelines behind them, and the cloud infrastructure running both, message me or click "𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯."

  • Java
  • Spring Boot
  • Data Engineering
  • Google Cloud Platform
  • Apache Hadoop
  • ETL Pipeline
  • Data Migration
  • Apache Airflow
  • Big Data
  • Data Warehousing & ETL Software
  • Data Integration
  • Python
  • REST API
  • Amazon Web Services
  • API Integration
  • Snowflake
  • dbt
  • Data Analysis
  • SQL

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