Java Spring Developer with over 15+ years of experience building scalable, high-performance solutions across diverse industries.
Technical Expertise
✅Spring Ecosystem: Spring Boot, Spring Batch, Spring Cloud, Spring Security, Spring AOP,
Spring MVC, JSP, Thymeleaf.
✅ AI : Claude , Codex , RAG ,Integration with OpenAI
✅Microservices & APIs: Microservices architecture, RESTful APIs.
✅Messaging & Event-Driven Systems: Apache Kafka, WebSocket, STOMP, Socket IO
✅Cloud Integration: AWS (ECS Fargate, S3, EC2, ALB, RDS).
✅Database Design: SQL (MySQL, Oracle, Yugabyte, PostgreSQL, MS SQL Server)
✅DevOps & Containers: CI/CD pipelines, Jenkins, Docker, Podman, Kubernetes
✅Search & Caching: Elasticsearch, Redis, Terracotta Caching
✅System Integration & Legacy Modernization: Seamlessly integrate modern applications with legacy systems
✅Frameworks & Tools: JHipster, Keycloak, Flowable, JBPM, Flyway, MapStruct, JavaFX, Java Swing
✅CMS Solutions: Documentum, Alfresco
✅XML & Web Services: SOAP, RESTful services
✅Reporting Tools: Crystal Reports, JasperReports, BIRT
✅Testing Framework/Tools: Junit5,Selenium,JMeter
Documentum
Java
Spring Boot
RESTful API
SQL
Spring Batch
Spring Security
Docker
Elasticsearch
Apache Kafka
Amazon ECS for Kubernetes
Microservice
Hibernate
Websockets
Swing
Kamaal M.
Saharanpur, India
$20/hr
5.0
49 jobs
I used to be the person on the support team fielding the same integration question five times a day - because the docs never explained it properly. That's what pulled me into technical documentation engineering.
Not theory. The actual gap between what a product does and what a developer or non-technical end-user can figure out from the docs alone.
Since then, I have spent my time cleaning up that gap for SaaS companies. I write and structure API documentation that developers can actually follow without pinging support - OpenAPI/Swagger specs, endpoint references, authentication guides, quickstarts, and the kind of "Getting Started" pages that stop a new user from bouncing in the first five minutes.
A good chunk of my recent work has also been in n8n - documenting custom nodes, workflow logic, and automation setups so that teams (and their clients) understand exactly what's running under the hood and why. I like this kind of work because it sits right at the intersection of technical accuracy and plain-English clarity - you need both, or the doc is useless.
{What I bring to your project}:
- API documentation (OpenAPI/Swagger, REST, Postman collections)
- SaaS product docs, help centers, and onboarding guides
- n8n workflow and node documentation
- Rewriting/auditing existing docs that are outdated, inconsistent, or just confusing
If your product works but your documentation is quietly costing you support tickets, churn, or dev time - that's exactly the kind of mess I like sorting out.
Send me a message and tell me what you're working with.
-------------------------------------------------------------------
{My Background and Skillset}
With a strong background in software engineering and web development, I understand the systems behind the documentation. This allows me to work directly with APIs, codebases, product teams and technical stakeholders to create accurate, well-structured documentation that stays useful as products evolve.
🔹 User Guides | How-to Guides
I create clear, task-focused documentation that helps users understand your product, complete workflows efficiently, and reduce dependency on support teams.
✅ User guides
✅ How-to guides
✅ Step-by-step tutorials
✅ Product onboarding guides
✅ Feature walkthroughs
✅ Knowledge base articles
✅ FAQs and troubleshooting guides
✅ Internal process documentation
✅ User manuals
✅ Visual workflows and screenshots
🔹 API Documentation (OpenAPI / Swagger Expert)
I create complete, production-ready API documentation that includes:
✅ Clear endpoint descriptions
✅ Request body parameters
✅ Query parameters & path parameters
✅ Authentication flows (JWT, OAuth, API Keys)
✅ Response structures with status codes
✅ Error codes with detailed schemas
✅ Properly defined data models
✅ Example requests & responses
✅ Postman collections
✅ SDK usage examples
I work extensively with:
Markdown • YAML • JSON • OpenAPI • Swagger • Redocly • Postman • GitHub ▪︎ ReadMe • Google Docs ▪︎ Zendesk • Docusaurus
Your APIs will not only function well - they will be understood instantly.
🔹 Developer & Technical Documentation
I create:
✅ Developer Guides
✅ API References
✅ SDK Documentation
✅ Integration Guides
✅ Database Documentation (SQL & NoSQL)
✅ System Architecture Documentation
✅ Technical Blogs & Articles
✅ Internal Engineering Documentation
✅ System Operating Procedures (SOPs)
✅ User Manuals
✅ How-To Guides
✅ Step-by-Step Tutorials
Whether your audience is developers, internal teams or non-technical users - I adapt tone, depth and structure accordingly.
🔹 Developer Portals & Documentation Platforms
I build structured, branded documentation portals using:
✅ Redocly
✅ ReadMe
✅ GitBook
✅ Docusaurus
✅ Mintlify
✅ Stoplight
✅ Confluence
✅ GitHub
I ensure your documentation is searchable, scalable, version-controlled, and beautifully structured.
🔹 Technical & Engineering Strength
My technical capabilities allow me to go beyond surface-level writing:
✅ Testing and validating APIs with Postman
✅ Running and testing SDKs
✅ Code commenting and codebase documentation
✅ JavaScript & TypeScript documentation
✅ Python code refactoring & documentation
✅ REST API workflows
✅ JSON, YAML, HTML, CSS
✅ Database structure documentation (SQL | NoSQL)
Because I understand the code, I document it accurately.
-----------------------------------------------------------------------------------
##TechnicalDocumentationEngineering #TechnicalWriting #TechnicalDocumentation #UserDocumentation #UserGuides #APIDocumentation #OpenAPI #Swagger #SOPWriting #KnowledgeBase #DeveloperDocumentation #InstructionManual #ProcessDocumentation #SoftwareDocumentation #Markdown #GitBook #n8n #n8nAutomation
Technical Documentation
Technical Writing
API Documentation
SaaS Development
OpenAPI
Markdown
User Guide Writing
REST API
n8n
AI Content Creation
Content Writing
JavaScript
React
Node.js
MongoDB Ops Manager
Blockchain Architecture
Crypto Asset
web3.js
Alvin Nguyen D.
Ho Chi Minh City, Vietnam
$70/hr
5.0
12 jobs
I’m a Camunda Expert, BPM Consultant, and Solution Architect with 10+ years of experience in process automation and AI-powered product development.
I help businesses design and build intelligent systems—from workflow automation with Camunda to AI-powered applications like chatbots, voice assistants, and document processing platforms.
Beyond traditional BPM, I deliver end-to-end AI solutions, including:
AI chatbots & assistants (customer support, internal tools, workflow copilots)
AI voice chat & voice bots (real-time conversation, call automation)
LLM integration (OpenAI APIs, prompt design, orchestration)
Model fine-tuning & optimization
Document processing (OCR + AI extraction + validation workflows)
AI + BPM integration (embedding AI into Camunda workflows)
I design scalable, production-ready systems using Camunda (Platform 7/8), Java, Spring Boot, Microservices, and Cloud (AWS, GCP/GKE, Kubernetes)—ensuring your solutions are reliable, maintainable, and future-proof.
What I can help you with:
Camunda implementation, optimization & migration (7 → 8)
BPMN workflow design & process automation
AI product development (chatbots, voice AI, intelligent workflows)
System architecture & microservices design
Backend development (Java, Spring Boot, REST APIs)
I focus on practical AI that delivers real business impact—reducing manual work, improving decision-making, and enabling scalable automation.
If you’re looking for a partner to design and deliver AI-powered automation or intelligent systems, I can help you take it from idea to production.
Apache Kafka
Spring Boot
Docker
Java
Business Process Model & Notation
Business Modeling
Business Analysis
AI Agent Development
AI Chatbot
AI Development
AI Builder
AI Speech-to-Text
AI Text-to-Speech
AI Content Creation
AI Bot
AI Data Analytics
AI Model Training
AI Writing Generator
Python
LangChain
Kamran M.
Lahore, Pakistan
$20/hr
4.8
13 jobs
You need a real engineer - not a no-code automation guy. I build production AWS systems that scale.
I'm Kamran, an AWS-specialized Full Stack Engineer with 5+ years delivering SaaS platforms, serverless backends, and AI-integrated applications - all built natively on AWS.
---
🏆 What I've delivered:
- SaaS platforms with multi-tenancy, billing, and RBAC on AWS
- AI-powered chatbots and automation using Bedrock, Lex, Comprehend, Polly, Textract
- Browser automation systems with Playwright running on ECS Fargate + SQS
- Document intelligence pipelines - extract, summarize, classify at scale
- Enterprise HCM platforms serving Middle East organizations on AWS
- Infrastructure as Code with CDK - clean, auditable, repeatable
---
💡 You should hire me if:
- You're building a SaaS product and need solid AWS architecture
- You need AI features built into your product - chatbots, document processing, summarization, transcription, ai processing
- You want serverless that actually works in production, not just demos
- You need an engineer who owns the problem end to end
---
🔹 AWS Stack:
Lambda · Step Functions · CDK · API Gateway · DynamoDB · Aurora · Cognito · EC2 · ECS · ECR · S3 · SQS · SNS · EventBridge · IAM · Bedrock · AgentCore · Lex · Comprehend · Textract · Polly · Transcribe · Rekognition · CloudWatch · Amazon Connect · AgentCore · RDS · ElastiCache · Athena · Glue · Kinesis · Redshift · VPC · Route 53 · CloudFront · ACM · WAF · Secrets Manager · Parameter Store
🔹 Supporting Tech:
Node.js · NestJS · Python · FastAPI · React · Next.js · PostgreSQL · Kafka
---
Quality, Commitment, and Trust — on every project.
📩 Tell me what you're building. Let's ship it on AWS.
Python
MongoDB
PostgreSQL
AWS Lambda
Serverless Computing
Retrieval Augmented Generation
Amazon Bedrock
Chatbot
Amazon Web Services
Spring Boot
Generative AI
SaaS Development
Amazon ECS
FastAPI
Full-Stack Development
Node.js
Haikal H.
Sleman, Indonesia
$48/hr
5.0
14 jobs
Reliable web scrapers & data pipelines that turn messy public data into clean, decision-ready datasets — at scale (100K+ records/day). 100% Job Success · 5.0★ · previously built 100,000+ RPS systems at ByteDance.
I help teams collect, clean, and visualize data they can act on — from large-scale scraping to ETL pipelines and interactive dashboards. I care about clarity, reliability, and compliant data collection (robots.txt, ToS, rate limits, rotating proxies).
What I deliver
✅ Web & social scraping (public data): Twitter/X, Instagram, YouTube, news, e-commerce
✅ ETL pipelines: cleaning, normalization, deduplication, scheduling, alerting
✅ Dashboards & data-viz: React/TypeScript, ECharts/D3, filters, maps, CSV/PDF export
✅ APIs & integrations: REST, auth, pagination, caching
✅ Deployment & handover: Docker, CI/CD, cron/Airflow, clear docs + maintenance plan
Recent results
• Pipelines processing 100K+ records/day across Twitter/IG/YouTube/news for sentiment & NER analysis
• Operated an 8-server HPC cluster — reliability +25%, processing time −40%
• Distributed scrapers with queueing (RabbitMQ) + monitoring (Grafana/Prometheus), ~99% uptime
🧰 Stack — Python (Scrapy, Playwright, Selenium, BeautifulSoup, Pandas), Node.js, PostgreSQL/MongoDB/Elasticsearch, Airflow/Prefect/Cron, RabbitMQ, Docker, GitHub Actions, GCP/AWS · React, TypeScript, Next.js, ECharts/D3.
Available for long-term collaboration and one-off projects. Tell me about your data and the decision it needs to drive — I'll propose the simplest reliable approach.
CSS 3
React
JavaScript
TypeScript
MySQL
MongoDB
Tailwind CSS
Next.js
Progressive Web App
Vue.js
PDF
PDF Conversion
Python
Puppeteer
Selenium
RAJ B.
Pune, India
$25/hr
4.8
55 jobs
Hello,
I consider myself an expert in Oracle Database world and Open for new opportunities!
I'm passionate about solution in Oracle Database design + APEX+ OCI + ORDS + OAC Expert Developer.
Working with more than 13+ years' experience in Oracle technology stack. With proven experience of expert in database and OCI practice.
⭐| Technical Area Expertise:
--------------------------------------------
✔️Expert Oracle SQL/PLSQL Developer
✔️Expert Oracle APEX Developer
✔️Oracle Cloud Infrastructure (OCI)
✔️Oracle ORDS services REST develop
✔️Oracle VBCS and Form & Report
✔️Oracle OAC OBIEE Publisher Reports
✔️Oracle WebLogic support and Maintains
✔️AI&ML services projects
✔Data Integration ETL tools
⭐| Database- Technical Expertise:
• Strong knowledge of Oracle Database versions 23ai/19c/12c/11g
• Hands on Data Modelling and Database Design
• Expert knowledge of Performance Optimizations Query Tuning
• Expert of advance SQL quires & PL/SQL Programming
• Hands on collections and records advance level exception handling
• Database DBA Administration for standalone and OCI hosted database
• Database connection issue with other languages TNS troubleshooting
• Debugging of issue and SQL developer data import and export
• Oracle WALLET manager , ACL and Network security issues
• Oracle Certificate installations for API outbound call from DB
• Send SMTP and HTTP send mail from database
• Oracle REST Data Services (Configurations, REST APIs development)
• Webservices Types REST, SOAP XML & JSON Data Processing
• Data integrations and ETL tools (data extractions transform)
⭐| APEX - Technical Expertise:
• Oracle Apex 24.1, 23, 22.x,20.x,19.x,18.x,5.x
• SQL& PL/SQL Programming expert (Advanced Level)
• Expert in writing Oracle Function, Procedure, Package ,Triggers, cursors and sequences.
• Oracle Forms and reports to APEX modernization
• Implemented projects on Oracle cloud AI Services (Generative AI, Language, Vision, Document, speech) with APEX projects
• Oracle REST Data Services (ORDS) APIs development and ORDS Configurations
• Integrations with APEX- Oracle Services, Microsoft, Google, Amazon, Digital Ocean, Login.com, Tableau, PayPal.
• Webservices Types REST, SOAP XML & JSON Data Processing in APEX.
• Automations With APEX services like Files processing, mails notification, Reports and Custom JOBS.
⭐| OCI - Technical Expertise
• Setting up and managing OCI networking (VCN, subnets, gateways, VPNs, etc.)
• Configuring OCI Web Application Firewall (WAF) to protect applications
• Email Delivery setup with (DKIM setting)
• Data-integrations, data-loading, OAC report setups
• WebLogic, NGINX, and load balancer setups OCI
• Supporting migration of workloads (VMs, databases) to OCI
• Configure DNS and manage domain mapping to the new OCI resources.
• Managing Identity and Access Management (IAM): domains, policies, dynamic groups, compartments
• Setting up IAM policies, compartments, and security controls (Cloud Guard, Vault)
• Working with Linux-based environments (Oracle Linux, RHEL) for system configuration, performance tuning, and troubleshooting
• Monitoring, performance tuning, and cost optimization
• Installation of Oracle database, APEX, OBI, ORDS, WebLogic infra.
⭐| OAC/OBIEE - Technical Expertise
• OAC report dashboard design
• Working on BIP report development
• BIP report bursting and exporting
• Email delivery of monthly reports using Bursting
• Crystal AOP, Jasper, PLPDF, Tableau Reports.
I have been working with clients across the globe.
𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞
I guarantee to solve your technical problems 100% in timely manner!
Thanks for reading my profile and I am confident that we can make your project successfully together.
Oracle E-Business Suite
Oracle WebLogic Server
Oracle Forms
Database Design
Oracle APEX
Database Programming
Query Tuning
Oracle Analytics Cloud
Oracle Cloud
Oracle PLSQL
Oracle Business Intelligence
SQL
Oracle Database Administration
Oracle Data Integrator
Data Lake
Oracle Integration Cloud Service
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