𝗬𝗼𝘂𝗿 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝘀𝗵𝗼𝘂𝗹𝗱 𝗳𝗲𝗲𝗹 𝗳𝗮𝘀𝘁 𝗼𝗻 𝘁𝗵𝗲 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱, 𝗿𝗲𝗺𝗮𝗶𝗻 𝗿𝗲𝗹𝗶𝗮𝗯𝗹𝗲 𝗼𝗻 𝘁𝗵𝗲 𝗯𝗮𝗰𝗸𝗲𝗻𝗱, 𝗮𝗻𝗱 𝗯𝗲 𝗲𝗮𝘀𝘆 𝘁𝗼 𝗲𝘅𝘁𝗲𝗻𝗱 𝗮𝘀 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗱𝘂𝗰𝘁 𝗴𝗿𝗼𝘄𝘀.
I build end-to-end web applications for businesses that need secure backend systems, responsive user interfaces, scalable APIs, reliable databases, and clean integrations working together as one product.
My development stack includes Java Spring Boot, Angular, React, NestJS, Python, TypeScript, MySQL, PostgreSQL, AWS, and Docker. I work across both frontend and backend development, helping clients avoid fragmented systems and unnecessary handoffs between multiple developers.
𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀 & 𝗦𝘆𝘀𝘁𝗲𝗺𝘀 𝗜 𝗕𝘂𝗶𝗹𝗱
• Full stack web applications
• SaaS platforms and subscription-based products
• Admin dashboards and reporting systems
• Customer and employee portals
• Internal business tools
• CRM-connected applications
• API-based platforms and integrations
• Secure authentication and user-role systems
• Workflow and business automation systems
• Scalable backend services and microservices
𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴
I develop backend systems using Java Spring Boot, NestJS, Python, TypeScript, REST APIs, JWT authentication, role-based access control, MySQL, and PostgreSQL.
This includes API development, database architecture, business logic, third-party integrations, authentication, performance improvements, and maintainable backend structures.
𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁
Using Angular and React, I build responsive interfaces, dashboards, portals, forms, and single-page applications that connect cleanly with backend APIs.
The focus is on usability, performance, reusable components, and frontend structures that remain manageable as new features are added.
𝗖𝗹𝗼𝘂𝗱, 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻
• AWS deployment and cloud configuration
• Docker-based development environments
• API and third-party platform integrations
• GoHighLevel CRM setup and automation support
• Workflow automation and funnel integrations
• Database and application deployment
• Ongoing maintenance and feature development
𝗪𝗵𝗮𝘁 𝗬𝗼𝘂 𝗖𝗮𝗻 𝗘𝘅𝗽𝗲𝗰𝘁
• A clearly structured application
• Secure and scalable backend development
• Responsive frontend implementation
• Proper API and database architecture
• Maintainable code rather than temporary fixes
• Clear communication throughout development
• A system designed for real business use and future growth
Whether you need a new SaaS platform, an internal business application, a Java Spring Boot backend, an Angular or React frontend, a NestJS or Python API, or improvements to an existing system, share your requirements and current setup.
I’ll help you structure and build a reliable full stack application that is ready for users, integrations, and continued product development.
𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀
Full Stack Developer, Full Stack Web Developer, Java Spring Boot Developer, Java Developer, Spring Boot, Angular Developer, React Developer, NestJS Developer, Python Developer, TypeScript Developer, REST API Development, API Integration, Backend Development, Frontend Development, Web Application Development, SaaS Development, Microservices, MySQL, PostgreSQL, JWT Authentication, Role-Based Access Control, Admin Dashboard, Customer Portal, AWS Deployment, Docker, CRM Automation, GoHighLevel, Workflow Automation
Java
Spring Boot
Full-Stack Development
Angular
React
NestJS
Python
TypeScript
RESTful API
API Integration
Front-End Development
Back-End Development
Web Application
Large Language Model
SaaS Development
Microservice
MySQL
PostgreSQL
Amazon Web Services
HighLevel
Mauro M.
London, United Kingdom
$30/hr
5.0
4 jobs
Organised, Trustworthy and Passionate Software Engineer with almost 20 years experience building highly scalable Web Applications.
Grown from Junior Developer to Team Leader as permanent employee within big and small Organisations, I faced all the steps of the SDLC and the challenges of working cross teams, startup environments, obsolete code, customer technical support, hardware replacement, solo projects, release management.
Below a list of skills and services I provide:
- Microservices
- Old school Monolithic web apps
- Code and Data Migrations
- Troubleshooting and bug fixing
- Infrastructure Design and Setup from basic to Highly Scalable Systems
- Requirements Gathering and Project Management
- Team and Project management using Agile methodologies
- Full Commitment to reach the deadline
I'm very looking forward to helping your business grow.
Your success is my success, get in touch!
Java
Software Architecture & Design
Spring Boot
Web Development
Web Application
Software Development
SQL
Portlets
Java Servlet API
REST API
Spring MVC
MySQL
PHP
Laravel
JavaScript
Muhammad Haroon Saeed C.
London, United Kingdom
$25/hr
4.9
26 jobs
With 14+ years of software engineering experience, I design and build Salesforce and e-commerce systems that help businesses automate operations, improve revenue processes, and scale efficiently.
I specialize in connecting GHL, Salesforce with modern AI capabilities and e-commerce platforms like Shopify to create fully integrated, automated business systems. My focus is not just development, but delivering end-to-end solutions that remove manual work and improve business performance.
I work with companies that need scalable CRM architecture, intelligent automation, and seamless integration across sales, service, marketing, and commerce systems.
What I Build
**Salesforce Solutions**
• Sales Cloud & Service Cloud automation
• Commerce Cloud (B2C / B2B) implementations
• Revenue Cloud (CPQ & Billing)
• Custom Apex, Lightning Web Components (LWC), and enterprise workflows
• End-to-end CRM architecture and optimization
**AI Automation & Agentic Systems**
• AI-powered CRM assistants and copilots
• Autonomous AI agents for sales and support workflows
• Retrieval-Augmented Generation (RAG) systems for enterprise knowledge
• Multi-step AI workflow orchestration across business tools
**E-commerce & Integration Systems**
• Shopify integrations with Salesforce
• Multi-system CRM and e-commerce synchronization
• API integrations with ERP, WMS, and third-party platforms
• White-label dashboards and internal operational tools
---
Technical Expertise
Salesforce (Sales Cloud, Service Cloud, Commerce Cloud, Marketing Cloud, Data Cloud, CPQ), Apex, LWC, MuleSoft, REST/SOAP APIs, Node.js, React, Python, OpenAI, vector databases, AWS, Docker, and cloud-native architecture.
Why Clients Work With Me
• 14+ years of enterprise software engineering experience
• Strong focus on business outcomes and automation ROI
• Experience building scalable, production-grade architectures
• End-to-end delivery from system design to deployment
Featured Enterprise Case Studies: Client Problem & Solution:
Movado Group (Luxury Timepieces & Jewelry)
The Challenge: Low digital engagement for luxury buyers who expected hyper-personalized, high-touch retail interactions online.
The Solution: Engineered a custom Salesforce B2C Commerce Cloud architecture featuring 360-degree high-resolution product views, custom engraving APIs, Calendly integrations for virtual sales appointments, and Einstein AI for dynamic product recommendations.
MVMT (High-Growth Fashion & Accessories)
The Challenge: High product return rates and lost international sales due to static product previews and localized currency barriers.
The Solution: Built custom SFRA templates, integrated Apple ARKit and WebXR for interactive Augmented Reality try-ons, and implemented multi-currency/multi-language regional checkout capabilities.
Life is Good (Optimistic Lifestyle Apparel)
The Challenge: High customer churn, elevated support loads regarding product warranties, and high fulfillment costs.
The Solution: Implemented a streamlined Buy Online Pickup in Store (BOPIS) workflow, integrated Clyde APIs for automated post-purchase warranty coverage, and connected Talkable to drive automated referral campaigns.
Riskified (AI Fraud Prevention & Risk Intelligence)
The Challenge: Rising merchant chargebacks, high manual transaction review costs, and delayed fraud detection.
The Solution: Deployed real-time machine learning fraud-scoring models using Python Flask, built automated chargeback protection webhook channels, and provided executive insight via custom Tableau dashboards.
Feefo / Reevoo (Global Customer Review Platform)
The Challenge: Disjointed feedback collection across disparate client stores and ineffective moderation for fake reviews.
The Solution: Developed multi-platform APIs and webhooks across Shopify, WooCommerce, and Salesforce, implementing automated review moderation and real-time JS SDK widgets.
If you're looking to connect Salesforce, AI, and e-commerce into one automated and scalable system, I can help design and implement it end to end.
Salesforce Developer, GHL, Salesforce Commerce Cloud, SFCC, Headless Ecommerce, Salesforce Sales Cloud, Salesforce Service Cloud, Salesforce Marketing Cloud, Salesforce CPQ, Data Cloud, MuleSoft, Apex Developer, LWC Developer, AI Automation, AI Engineer, AI Developer, OpenAI, GPT-4, Claude AI, Gemini AI, LLM, RAG, Retrieval Augmented Generation, AI Agents, AI Chatbot, Conversational AI, Machine Learning, Generative AI, Prompt Engineering, LangChain, CrewAI, Semantic Search, Vector Database, Pinecone, FAISS, Qdrant, AI SaaS, SaaS Development, Claude Agent, AI Agent Development, Autonomous AI Agents, Multi-Agent GoHighLevel, GHL, Funnel Automation, Sales Funnels, High-level Automation, CRM Integration, Zapier, Make, n8n, Workflow Orchestration, Database Design, PostgreSQL, MySQL, MongoDB, Node.js, React.js, Next.js, Python, TypeScript, JavaScript, SaaS Automation, White Label Solutions, Enterprise AI
Ecommerce Website Development
Salesforce
Mobile App
Web Application
API Development
Python
LangChain
Vector Embedding
AI Chatbot
OpenAI API
Supabase
React
n8n
SaaS Development
Generative AI
Muhammad Ahsan M.
Sheffield, United Kingdom
$14/hr
5.0
4 jobs
I help startups and businesses turn ideas into secure, scalable, high-performing digital products. Whether you need a business website, a SaaS platform, an e-commerce store, or a cross-platform mobile app I handle everything from design and development to deployment and long-term support, so you don't have to juggle multiple freelancers.
What I can do for you:
✅ Web Development: Corporate & business websites, custom web apps, WordPress/WooCommerce, e-commerce, payment gateway & API integrations
✅ UI/UX Design: Responsive, conversion-focused interfaces, landing pages, dashboards, and design systems
✅ Mobile Apps: Native Android & iOS, Flutter, and cross-platform apps for e-commerce, healthcare, FinTech, and booking platforms
✅ Backend & APIs: REST & GraphQL APIs, authentication, microservices, database design (MySQL, PostgreSQL, MongoDB, Firebase, Supabase)
✅ Cloud & DevOps: AWS (EC2, S3, IAM, VPC, Route 53), DigitalOcean, Docker, CI/CD pipelines, Nginx, Cloudflare, SSL setup, server security & optimization
✅ Ongoing Support: Speed optimization, monitoring, security updates, and maintenance after launch
Why work with me:
🔹 Security-first, scalable code built for growth
🔹 Clear, transparent communication — no surprises
🔹 On-time delivery with a focus on quality
🔹 Reliable long-term support, not just a handoff
Send me a message with your project details, and I'll get back to you quickly with a clear plan, timeline, and estimate.
Java
ARCore
Kotlin
Web Service
RESTful API
Firebase Realtime Database
Android App Development
Model View ViewModel
FinTech Consulting
JSON
Bilal S.
Lincoln, United Kingdom
$35/hr
5.0
1 jobs
Hi. I am Bilal, A Experienced Java Developer and A Certified Spring Professional by Broadcom. I’m an expert in providing API-based solutions related to Spring Boot, Microservice-based projects along with API Gateway, Message brokers , SQL & NoSQL databases, Maven, AWS Lambda, Kubernetes.
Technical Competencies:
• Java Tech-stack: Spring Boot, Spring Security Hibernate, JPA, Spring Cloud, JavaFX, Android, AWS Lambda, AWS SNS, AWS SQS, AWS CodePipeline, AWS CodeCommit
• Language known: Expert in Java, Core JavaScript, basic Python, Core TypeScript
• Database Hands-on: MySQL, Oracle, H2, Redis, PostgreSQL, MongoDB, Elasticsearch, AWS DynamoDB, Cassandra
• Storage Hands-on: Firebase Storage, AWS S3 Bucket Storage
• Messaging and Notification Frameworks: Apache Kafka, RabbitMQ, AWS SNS & SQS
• Continues Integration and Continues Deployment Hands-on: Git, GitHub, Bitbucket, Dockers, AWS Code Build, Heroku
Profile Summary:
• Hands-on experience on Spring Boot based microservices, AWS SNS & SQS
• Handled structured, semi-structured and unstructured data
• Experience in Python scripting for data processing , ReactJS for Frontend development
• Strong Code Reviews in Spring Boot based microservices, testing with Junit, Mockito and Postman
My qualities include:
● Good communication skills & happy to give you regular updates via Upwork, email, Skype etc.
● Good quality , clean and robust code.
● On time delivery
● Top Rated on other Freelancing Platform
● Client's 5 star feedback on Freelancing Platform
My business objective is to help my clients to build their Web applications, APIs or Microservices as quickly as possible without neglecting critical security, performance and usability issues.
I aim to form a long-term working relationship.
Thank you .
Java
Spring Boot
Spring Framework
Spring Security
Spring Data
RESTful API
React
Amazon Web Services
System Configuration
Professional Tone
Apache Kafka
Software Testing
NoSQL Database
JavaFX
Spring Cloud
Pranay T.
East Grinstead, United Kingdom
$60/hr
5.0
19 jobs
If you are scaling a core backend platform, minor architectural mistakes result in data loss, runaway cloud bills, or fragile payment ledgers. I specialize in engineering high-throughput, fault-tolerant backend systems and secure cloud infrastructure for high-growth platforms.
My background includes building, optimization, and scaling core platforms for global tech giants like Cisco (ThousandEyes) and Skyscanner.
Depending on your engineering team's current bottleneck, I provide elite-level engineering across three core pillars:
☕ PILLAR 1: ENTERPRISE BACKEND & CONCURRENCY (JAVA & GO)
• High-scale backend systems utilizing Java (Spring Boot, Reactive Spring, Dropwizard) and Kafka to handle massive, real-time data streams.
• Asynchronous, real-time event processing services engineered in Go (Golang) capable of handling millions of concurrent WebSocket events.
• Core database design and query optimization for PostgreSQL, MySQL, and cross-region DynamoDB setups.
🚀 PILLAR 2: FINTECH & PAYMENTS INFRASTRUCTURE (STRIPE CONNECT)
• End-to-end multi-tenant marketplace onboarding and complex split-fee distribution logic.
• High-concurrency transaction processing and secure ledger synchronization.
• Built cross-region, fault-tolerant payment gateway platforms utilizing Java and DynamoDB Global Tables at Skyscanner.
☁️ PILLAR 3: CLOUD-NATIVE DEVOPS & SYSTEMS (KUBERNETES / GCP / AWS)
• Container orchestration and cluster tuning using AWS EKS, GCP, and Docker.
• Fully declarative GitOps continuous delivery pipelines utilizing ArgoCD and GitHub Actions.
Whether you need a senior engineer to untangle a bottleneck in your Go microservices, build a robust Java system, or map out a high-security Stripe Connect implementation, I bring the rigorous standards of a former Big Tech staff engineer to your architecture. Let's discuss your timeline.
Java
Spring Boot
Spring Framework
Redux
ExpressJS
React
Node.js
JavaScript
MongoDB
HTML5
Front-End Development
MySQL
Stripe
Web Design
Back-End Development
How it works
Post a job for freePost a job
Tell us what you need. Create your own job post or generate one with AI then filter talent matches.
Hire top talent fast
Consult, interview, and hire quickly, so you can meet the freelancers you're excited about.
Collaborate easily
Use Upwork to chat or video call, share files, and track project progress right from the app.
Payment simplified
Manage payments in one place with flexible billing options. Only pay for approved work, hourly or by milestone.
Don't just take our word for it
“Upwork provides an umbrella-level of security. I can see a talent’s work history and ratings. I can hold payments in escrow. I can communicate through Upwork Messages instead of working through my email address.”
KD
Kim Darling
Emerald Tiger
“Upwork is the best platform to hire skilled professionals when we're not looking for a full-time employee. All the companies in our portfolio use Upwork to find talent across a wide range of fields.”
DM
David Merry
Kinetic Investments
“Our very specific requirements can be a challenge—With Upwork, we’re able to access a bigger community to ensure the success of our projects.”
Top interview questions to help you hire the right Java developers, faster.
How do I hire a Java Developer in the United Kingdom on Upwork?
You can hire a Java Developer in the United Kingdom on Upwork in four simple steps:
Create a job post tailored to your Java Developer project scope. We'll walk you through the process step by step.
Browse top Java Developer talent on Upwork and invite them to your project.
Once the proposals start flowing in, create a shortlist of top Java Developer profiles and interview.
Hire the right Java Developer for your project from Upwork, the world's largest work marketplace.
At Upwork, we believe talent staffing should be easy.
How much does it cost to hire a Java Developer?
Rates charged by Java Developers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.
Why hire a Java Developer in the United Kingdom on Upwork?
As the world's work marketplace, we connect highly-skilled freelance Java Developers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream Java Developer team you need to succeed.
Can I hire a Java Developer in the United Kingdom within 24 hours on Upwork?
Depending on availability and the quality of your job post, it's entirely possible to sign up for Upwork and receive Java Developer proposals within 24 hours of posting a job description.
Find more freelancers
Top cities for Java Developers in the United Kingdom