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$30/hr
91%
Job Success
$20K+ earned
Offers consultations
Start of list.
End of list.
I build production-ready web apps and AI features that ship fast and don’t break in production.
RAG chatbots, AI agents, LLM integrations, and full-stack delivery (Spring Boot + React/Next.js + Node/Python).
Top Rated | 100% Job Success
Hi, I’m Muneeb, a Full-Stack Engineer specializing in AI integrations (LLMs, RAG, Agents) and scalable web apps.
I help startups and product teams ship clean, fast, production-ready features from MVP to mature systems without hand-holding.
What I build (client outcomes)
LLM features inside your product: summarize, extract, classify, chat, search, Q&A
RAG chatbots (secure, multi-tenant, citations, evals, monitoring)
AI agents & tool-using workflows (guardrails, retries, structured outputs)
Full-stack SaaS features (auth, billing, dashboards, APIs, admin panels)
Automation + integrations (OAuth, 3rd-party APIs, Twilio, webhooks, event-driven flows)
Performance & reliability fixes (slow endpoints, query tuning, memory leaks, flaky UI)
My core stack
Frontend: React, Next.js, Angular, TypeScript, Tailwind, shadcn/ui
Backend: Java (Spring Boot), Node.js (NestJS), Python, REST APIs
AI/LLM: RAG, AI Agents, prompt engineering, LangChain/LangSmith, Claude/Gemini (as needed)
Data: PostgreSQL, MySQL, MongoDB
DevOps: Docker, Git, CI/CD (GitHub Actions/Jenkins)
How I work
* Clarify scope + success criteria (fast)
* Ship an MVP version early (so you can test)
* Iterate with tight feedback loops
* Handover with clean code + docs + deployment notes
If you want someone who can own a feature end-to-end and deliver reliably, message me with:
your goal, your current stack, and what “done” looks like.
Muneeb K.
has worked
.
$35/hr
100%
Job Success
$200K+ earned
Start of list.
End of list.
🎯 Liferay DXP 7.4 Certified Professional Back-End Developer
⌛ 10 Years on Liferay Platform
🏆 100% Job Completion | Top Rated on Upwork | 7500+ Hours on Upwork
I have 10 years of expertise in Software Development, Solution Architecture, and Product Design, with a strong focus on Liferay and Spring technology.
💼 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐒𝐤𝐢𝐥𝐥 :
𝐂𝐨𝐫𝐞 : Java, J2EE, Liferay(6.X/7.X), Spring Boot, JSF, PrimeFaces,Icefaces, Richfaces, FHIR, ABDM, SNOMED-CT,REST, SOAP web services
𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 : AngularJS, ReactJS, HTML4/5, XHTML, XML, CSS3, jQuery, JavaScript, AJAX
𝐒𝐞𝐫𝐯𝐞𝐫𝐬 : Tomcat, JBoss/Wildfly and Jetty, GlassFish
𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 : Spring Security, OAuth2, JWT
𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞 : SQL, MySQL, PostgreSQL, MongoDB and Oracle
𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 : Gmail, Google Meet, Google Calendar, Zoom, RazorPay, Stripe, SMTP, Twilio, DocuSign, Google Maps API, PayPal
𝐇𝐞𝐚𝐥𝐭𝐡𝐂𝐚𝐫𝐞 𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝 : FHIR | EHR | EMR | SNOMED | HL7 | OpenEHR | OpenEMR | ABDM
𝐒𝐞𝐚𝐫𝐜𝐡-𝐄𝐧𝐠𝐢𝐧𝐞𝐬 : Apache Solr, Elastic Search
𝐂𝐥𝐨𝐮𝐝 𝐚𝐧𝐝 𝐃𝐞𝐯𝐨𝐩𝐬 : AWS, Google Cloud, Azure, Jenkins, CICD, Docker, Kubernetes
𝐓𝐞𝐬𝐭𝐢𝐧𝐠 : JTest, JUnit, Mockito and Powermock
𝐂𝐨𝐝𝐞 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐓𝐨𝐨𝐥𝐬 : Crucible and Sonarqube
𝐁𝐮𝐢𝐥𝐝 𝐭𝐨𝐨𝐥𝐬 : Maven, Gradle, Ant, npm, grunt and webpack
𝐕𝐂𝐒 : SVN, GIT, GITLAB, Bitbucket
𝐎𝐒 : Linux, Windows and Mac OS
𝐁𝐮𝐠/𝐈𝐬𝐬𝐮𝐞 𝐭𝐫𝐚𝐜𝐤𝐞𝐫𝐬 : Jira, asana, Trello
🔐𝐋𝐢𝐟𝐞𝐫𝐚𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 :
➜ Expert in almost all OOTB features [ Sites, Pages, Webcontents, Fragments, Layouts, Asset Publishers, Categories, Tags, Search, Workflows, User Management, Roles, Permission, User Groups ]
➜ Implemented Custom Portlets [ using MVC, React, Spring, JSF, service builder and standards like OSGI, JSR 168 and 268 ]
➜ Implemented REST API using Liferay Rest builder
➜ Implemented themes [ using Freemarker, velocity ],
➜ Customized Liferay [ using Service wrapper, Portlet filter, Lifecycle events, Model listeners,
Search contributors, JSP, Core Classes ]
➜ Implemented Web Fragment [ Freemarker, HTML, CSS, Javascript ]
➜ Implemented SSO Integration supports SAML, Keycloak, LDAP, OpenId, OAuth, and more
➜ Implemented SMS and WhatsApp Integration using Twilio
➜ Implemented Third-Party integration using REST API or client SDK
➜ I have recently upgraded Liferay 7.0 to Liferay 7.4 including data and code migration both.
Looking forward to working with you to develop and deliver a fantastic product and Solutions as per your Business Requirements.
$25/hr
80%
Job Success
$1K+ earned
Start of list.
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I'm a full-stack developer working across two focus areas: AI agent development and browser game development.
AI & LLM Integrations
I build and customize AI agents using Claude Code, ClawdBot, OpenClaw, and related LLM tooling.
What I do:
- Set up and configure Claude Code for development workflows
- Build custom MCP servers and tool integrations
- Design and deploy LLM-powered agents and automation pipelines
Browser Game Development
I also build browser-based games using JavaScript and HTML5, with a focus on smooth physics, responsive controls, and performance optimization. My background includes Minecraft plugin and mod development, so I bring real game design thinking (game loops, state management, player experience) rather than just general web development skills.
Recent game projects:
- Snooker game with full physics simulation (ball collision, cue control, live scoring)
- Real-time browser game style growth and collision mechanics
Across both areas, I focus on clean, maintainable code and delivering something that actually works well for the end user, whether that's a smooth AI workflow or a responsive game experience.
Sahid H.
has worked
.
$15/hr
$100+ earned
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Hi, I'm Emmanuel, a Fullstack Engineer with a strong backend focus.
I've helped early stage SaaS and CRM companies build their products handling things from architecture to deployment especially in fast paced environments. I'm quite versatile and proficient in Go, Java (Spring Boot), TypeScript (Node.js/Express), and Python (FastAPI).
While I'm newer to Upwork, I bring solid professional experience as my CV and portfolio speak to the quality of my work.
I Bring:
- Third-party integrations, automation workflows, and AI solutions
- Docker, CI/CD, and cloud deployments
- Performance optimization, monitoring, and incident management
- Strong communication and teamwork
I'm comfortable working with early-stage teams and open to video/voice calls.
$100/hr
100%
Job Success
$10K+ earned
Start of list.
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Seasoned software engineer specializing in enterprise grade backend development and real-time system integrations in highly regulated environments.
Former engineering lead at CHECK24 - Germany’s largest comparison platform.
From concept to post-launch, I stay hands-on while guiding teams and stakeholders.
KEY PROJECTS
• Real Time Financial Integrations - 15+ bank integrations for real time credit-card approvals.
• Digital Identity Verification - video-KYC and qualified-signature workflow with full state tracking.
• Secure Document Transfer - modular, encrypted exchange of sensitive bank files to third parties.
• ML Credit Card Approval Prediction - led R&D and production rollout of custom approval likelihood model.
• Monolith to Microservices - extracted critical domains into independent services with zero downtime.
Whether you need a robust, secure and scalable architecture that’s ready for growth or want to integrate AI capabilities into your existing system - I’m here to help you.
Jure P.
has worked
.
$30/hr
98%
Job Success
$60K+ earned
Available now
Start of list.
End of list.
A top-rated expert in crafting end-to-end AI solutions, from UI design to deployment, that are beautiful, robust, scalable, and cost-effective.
I work at the intersection of AI Agents, CRM Systems, AI Automation, Web and Mobile App Development, Product Design, and Cloud Infrastructure. Helping startups launch fast and established teams save time and cost.
🚀 What I'm Best At:
🔹 AI Agents and Automations using Claude Code, n8n, GoHighLevel (GHL), chatbots and voice agents:
🎤 Voice Bots: Retell, Vapi, Twillio, ElevenLabs, Telnyx, and more
🗣️ Chatbots: Custom Bots, Wordpress, Shopify, Vapi, Rasa, ChatterBot, Amazon Lex, and more
🧠 Automation & Integration: Claude Code, n8n, Zapier, Make
🔍 Vector Databases for RAG: Chroma, Pinecone, Qdrant, pgVector
📣 Lead Generation, Outreach and Automation Systems
📦 Other: GoHighLevel integration, Social Media Automation, Video Generation automation, Blog Generation Automation, Custom Business Processes Automations, Document conversion to Audiobook, Offline form docs to Live Surveys, Creating Social Media Posts from Documents
🔹 Full Stack Web App Development:
🔧 UI/UX Design: Figma, Prototyping, Web Accessibility
🖥️ Frontend Development: Next.js, React, Angular, Vue, Vaadin
💻 Backend Development: Node.js, NestJS, Java (8–20+), Kotlin, Python
🐍 Python Frameworks: Flask, FastAPI
⚙️ Java Ecosystem: Spring Boot, Spring MVC, Spring Security, Spring Data JPA, Spring Cloud, Spring AI, Micronaut, Hibernate, Apache Camel, Apache Kafka, Keycloak
📦 Other: Ktor, JavaFX
💾 Databases: MySQL, PostgreSQL, MongoDB, IBM DB2, Oracle, MariaDB
🔧 Tools: JDBC, Maven, Gradle, XSL, JSTL, JSP
📊 Observability: Elastic Stack, Prometheus, Grafana, Logstash, Kibana, Datadog, Loki, Jaeger, AWS CloudWatch
✅ Software Testing: Playwright, Selenium, Cypress, Jest, Vitest, JUnit, Mockito, Cucumber, Selenium, Concordion
☁️ DevOps & Cloud: AWS, GCP, Docker, Kubernetes, Bash, Shell, Ansible, Terraform, Chef, CloudFormation, Jenkins, GitLab CI, Pulumi (IaC)
🔹 Mobile App Development:
📱 Frameworks: Flutter/FlutterFlow/Dart, React Native, Expo, Android and iOS native bridging
🔒 Authentication & Notifications: Firebase Auth, Push Notifications, FCM,
💾 Offline & Real-Time: Offline Support, Real-time Sync, Secure Storage
🔹 Why Choose Me:
› I treat client success as my own, caring for their project like it's my own
› Excellent and Bilingual English communication: I understand your requirements completely, and can communicate clearly, and I make sure to keep you updated
› Dedicated to clean, beautiful work: Well-documented work that any new dev can jump on, and has a low maintenance cost.
› AI-embedded workflow: I extensively use an AI-first approach. This reduces cost and time to ship, giving me the edge over traditional dev shops
💪 Proven Success:
I'm happy to connect you with one of my previous clients on a live call, who can personally vouch for the value I delivered.
🔹 Let’s Talk
Do you need:
- An AI system to automate your business processes to save costs and time
- To develop a web app or mobile app MVP you can sell as a SaaS product
- To modernize your existing Enterprise app with AI features
- A high-converting Shopify store
You are welcome to click the "Invite" button, or just send me a message : )
Syed A.
has worked
.
Associated with
Robustcraft
$50K+
earned
Croatia
$35/hr
$2K+ earned
Start of list.
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💼 Profile Overview
I am a senior Java backend engineer with deep experience building reliable, scalable, and cleanly architected systems for production environments—especially in telecom, enterprise platforms, and transactional systems.
For the past several years, I’ve worked extensively with Java (8+) and Spring-based applications, focusing not just on “making things work,” but on designing systems that are maintainable, testable, and future-proof. I have a strong preference for clean code, solid abstractions, and proven design patterns (Template Method, Strategy, Chain of Responsibility, DDD-inspired architectures).
🔧 What I specialize in
Java backend development (Java 8+, Spring / Spring Boot)
System & API design (REST, SOAP, CXF, integrations)
Complex business logic & refactoring of legacy code
Concurrency & performance (parallel processing, batching, locking, race-condition prevention)
Database-heavy applications (PostgreSQL, JPA/Hibernate, CriteriaBuilder, query optimization)
Enterprise integrations (SOAP/WSDL, government APIs, fiscalization systems)
Asynchronous & event-driven patterns (Inbox/Outbox, eventual consistency)
Testing & reliability (unit tests, concurrency tests, clean test isolation)
🧠 How I work
I don’t just implement tasks blindly—I analyze the problem domain, ask the right questions, and often propose simpler or more robust solutions than originally planned. Clients appreciate that I:
Refactor duplicated or fragile code into clean, reusable components
Spot architectural risks early
Write code that other developers can actually understand
Balance correctness, performance, and long-term maintainability
🏗️ Real-world experience
Telecom-grade systems handling subscription lifecycles, synchronization, and high concurrency
Enterprise APIs with strict validation, error handling, and audit requirements
Custom frameworks and internal libraries (including Maven plugins and Java libraries)
Docker-based environments, multi-module Maven projects, and CI-friendly setups
🎯 Ideal projects
I’m a great fit if you need:
A senior Java engineer who can own backend logic end-to-end
Help refactoring or stabilizing a complex Java/Spring codebase
Someone to design or improve architecture, not just write features
Clean integration with external systems (SOAP/REST, legacy or modern)
If you value clear communication, strong technical judgment, and production-quality code, I’d be happy to work with you.
Bosnia and Herzegovina
$20/hr
$100 earned
Start of list.
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Hi 👋 My name is Mirza, I am a software engineer!
Why choose me as your engineer:
🧩 End-to-end engineer - backend, frontend, testing, and deployment (I can deliver the whole product solo)
🛠️ Engineer mindset - building robust, scalable, and maintainable systems, not just writing code
🏢 Enterprise experience - worked on large-scale systems for Scandinavian Airlines (SAS) and Wüstenrot Bank
🚀 From scratch to production - proven experience building software from zero
🔄 Always up to date - actively following modern technologies and framework updates
🚀 Technologies I Use:
🔹 Frontend: 🅰 Angular 🖥️ TypeScript ⚡JavaScript 🎨 HTML5 🎭 CSS3 ⚛️ React.js
🔹 Backend: ♨️ Java 🍃 Spring boot 🅺 Kotlin 🏗️ Node.js 🌐 Express.js
🔹 Databases: 🛢️ PostgreSQL ⭕ OracleSQL
🔹 Cloud & DevOps: ☁️ AWS 🌿 Bamboo 🅾️ OpenShift 🐳 Docker ⚙️ Kubernetes ⚡ CI/CD
📌 Visit my website: mmujkanovi1.github.io/newPortfolio/
Mirza M.
has worked
.
$19/hr
$400+ earned
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I’m a Full-Stack Software Developer with over 7 years of hands-on experience building enterprise-grade web and mobile applications. My core stack includes Java (Spring Boot, Grails) for backend APIs and Angular / Kotlin / Swift for modern, scalable frontends.
I specialize in developing web enterprise application, subscription systems, and secure REST APIs — integrating tools like Stripe, Google Play Billing, and Apple IAP for smooth monetization flows.
Currently, I collaborate with Impel IT Solutions, a Netherlands-based agency, delivering high-performance, data-driven solutions for clients worldwide.
💡 Tech Focus: Spring Boot · Grails · Angular · PostgreSQL · Redis · Docker · AWS
💬 Clean code • Continuous improvement • Reliable communication
$18/hr
$2K+ earned
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Co-Founder | Lead Software Architect & Programmer, Trade Vectors LLP | Mumbai, India
13+ years experience on core software development, web development, programming, deploying automated trading & algorithmic trading systems on multiple stock broker APIs, for stocks | equities, futures, options, forex, commodities, cryptos. Believe in providing robust and seamless auto trading software solutions with prime focus on execution speed, scalability, concurrency.
Conduct training sessions on algorithmic trading in Python, C# for NTUC Singapore and NSE Academy India in association with NSE (National Stock Exchange, India).
Education background
Master’s in Computer Science (University of Massachusetts, USA);
Bachelors in Computer Science, Mumbai University, INDIA
1 Year Diploma in ML & AI (BITS Pilani WILP);
WSQ-certified NTUC trainer (SkillsFramework Singapore).
Certified Instructor, Algorithmic Trading in Python (NTUC Singapore / NSE India / Times Group)
Overview:
Seasoned fintech innovator with a proven track record in multi-asset algorithmic trading, AI/ML research, and corporate training. Built and backtested index-futures strategies (Nifty50, ES-Mini, Dow Jones) over 25 years; deployed sentiment-analysis bots; quant based short term trading strategy for stocks, options trading software to create multi leg trades, pattern recognition trading strategy software on Index, Forex and integrated systems across 10+ broker APIs and platforms.
Simultaneously pioneering AgriTech: managing a 40-acre organic farm and developing AI-driven solutions for sustainable agriculture.
Core Skills
Programming & Development
Python, Java, C#, C++, SQL, MQL4/5
REST/WebSocket APIs, FIX, high frequency trading, low latency trading, market data feeds
TensorFlow, PyTorch, Scikit-learn, Keras
Trading & Finance
Asset Classes: Index Futures, Stocks | Equities, Options, Forex, Cryptos
Strategies: Trend following, Sentiment analysis, Pattern recognition, Volume-profile analysis
Risk Management: Portfolio optimization, backtesting, performance analytics
AI & Data Analytics
Deep Learning for time-series forecasting
NLP & transformer models for news sentiment
Reinforcement Learning for strategy optimization
Computer Vision for chart pattern recognition
Platforms & Integration
Interactive Brokers, MetaTrader 5, Sterling Traders, Charles & Schwab, NinjaTrader, Trading Technologies, ThinkOrSwim, Takion, MultiCharts, QuantConnect, TradingView, Robinhood, Zerodha, Angel, NEST trading platform, Groww, Fyres and more.
Professional Experience
Trade Vectors LLP (2012–Present)
Led development of custom trading software systems with scalable software architect, robust trading software.
Managing teams of programmers, analysts; delivered on-time, scalable solutions
Integrated multi-broker APIs , multi accounts for real-time trading software, backtesting software
NTUC Singapore & NSE India (2019–Present)
Designed and delivered WSQ-certified algorithmic trading curriculum
Trained 500+ professionals; 95% satisfaction via blended learning workshops
Research & Projects
AI-Enhanced Trend Strategy: Neural-network model for index-futures trading; backtested 2000–2025, 23% lift in risk-adjusted returns
Sentiment Analysis Bot: Transformer-based news scanner; 15% improvement in trade timing accuracy
AI AgriTech Pilot: IoT sensors with ML for soil analytics; reinforcement-learning irrigation system
Value Proposition
End-to-End AI/ML Expertise: From model design to cloud deployment (AWS/Azure)
Certified Trainer: WSQ-recognized adult education; proven course design & delivery
Multi-Platform Integration: Seamless API connectivity across leading brokers
AgriTech Innovation: Unique fusion of fintech and agricultural AI solutions
Engagements: Short-term sprints, long-term retainers, corporate training contracts, organic farming and hydroponics setup projects
Communication: English, Hindi; agile methodology with regular milestones
Let’s transform your trading strategy with cutting-edge technology and proven methodologies.