It was the most important moment of my 13+ years of career. It was when I realized that there is always a trade-off in technology.
You have to do something intentionally bad in order to succeed as a Small Medium Business in the Digital Transformation. And 70% fail because they insist on doing this very thing well.
A while back, when I finally landed a job in a corporation, I was excited that I was going to use state-of-art technology. But, one of my first features immediately added some bugs.
As I fixed those bugs, I introduced another, but also other bugs started to pop up caused by previous developers.
In laymen terms, it is like a Rubik’s cube. As you carry on assembling the second face, you may accidentally mess up the first bit.
It wasn’t like that when I started my career in technology in the civil service a long time ago. Yes, I was frustrated because we used old boring technology. But, we didn’t have to put out the fire all the time because that limited technology prevented us from getting in this position.
Coincidence or not, the easiest way to solve the Rubik’s cube is putting constraints. If you move towards, you have to move backwards at some point.
Fast forward to nowadays, some of my clients want to create highly customized User Experience.
As the project starts to grow, hyper customization introduces more complexity. Then, you make a small change and get unexpected results. You didn't account for all the complex consequences. And this happens again and again, and you can’t avoid it. The software had become brittle.
You start to miss deadlines or have to hire more developers to fix cracks faster, and eventually I get hired. That’s the time I have the hard talk: don’t bite more than you can chew, stop chasing the perfect User Experience (good User Interface is not a problem though) with a small team. If a BigTech didn’t have to hire thousands of engineers to provide that, they certainly wouldn’t.
Anyway, User Experience is only noticed by B2C clients, and this is where Big Techs thrive. In B2B or internal tool software, who pays for the software won’t even use it.
Hey, my name is João, I’m a software architect and developer, feel free to send me a message asking how I can make your business grow.
What technologies do I work with? The simple ones: HTML, CSS, Bootstrap, Bash, XML, PostgreSQL, Apache Camel, Apache Knowledge Is Everything, Keycloak. If you need a hypercustomized solution, I can decently program in Java, Python and JavaScript, though.
If you have any doubts, don’t hesitate to contact me.
Apache Camel
jBPM
Drools
Java
PostgreSQL
XSLT
HTTP
Cache Management
SQL
Cloud Architecture
Bootstrap
PostgreSQL Programming
Database
Linux
Python
Orleando Dassi M.
Sherbrooke, Canada
$80/hr
4.9
47 jobs
I'm a Senior Consultant with 10+ years of experience in diverse industries. I am a good team player who loves to work on interesting missions, using my expertise to provide value to customers.
I lead and get involved in human-sized teams, where I propose and enforce architectural decisions to deliver better solutions while ensuring they scale.
My flexibility is one of my greatest assets; I'm defined as sociable, a team player, someone who knows how to adapt to any environment, and always willing to put in the work required for continuous improvement.
I'm very professional whenever needed and at other times a good joker, soccer player, and writer. Taking initiatives that will advance the team and/or the project is what defines me the most while working collaboratively.
My main skills are oriented toward Solutions Architecture, System Integration, Salesforce, Cloud computing, Software Development, Apache Camel, and Apache Airflow.
Other accomplishments:
- I coached over 100 people in tech.
- Crossed +1 million people reached on StackOverflow in 2023.
- Top contributors in the NumericaIdeas community (2022).
- Top 3% of Upwork freelancers in 2021 (Top Rated Plus badge).
- Top 20% Google Translate Contributors in 2017.
- More than 100 tech articles/videos published on the internet.
Apache Camel
Spring Boot
Amazon Web Services
React
Node.js
Java
JavaScript
MongoDB
Angular
Microservice
WordPress
API Development
Heroku
Solution Architecture
Salesforce
Bhuman V.
Canton, Michigan
$25/hr
5.0
1 jobs
I am an Expert MERN Full Stack Developer and Technical Lead with 10+ years of experience designing, developing, and delivering secure, scalable, and high-performance enterprise applications. My expertise includes React, Next.js, Node.js, Java, Spring Boot, Microservices, REST APIs, AWS, Kubernetes, Kafka, and AI-powered application development.
I help businesses build modern web applications, backend services, cloud-native platforms, and enterprise-grade systems that are reliable, scalable, and easy to maintain. I have strong experience in both frontend and backend development, with a focus on clean architecture, performance, security, and production-ready delivery.
My technical expertise includes:
Frontend: React, Next.js, JavaScript, TypeScript, HTML, CSS
Backend: Java, Spring Boot, Spring MVC, Spring Security, Node.js, REST APIs, GraphQL, gRPC, SOAP
Cloud & DevOps: AWS, Azure, Docker, Kubernetes, Jenkins, GitHub Actions, Terraform, CI/CD
Databases & Messaging: Oracle, PostgreSQL, MySQL, SQL Server, MongoDB, Redis, Kafka, RabbitMQ, ActiveMQ
AI & Modern Apps: AI integration, API-based AI solutions, cloud-based intelligent applications
Testing & Quality: JUnit, Mockito, API testing, performance tuning, logging, monitoring, code review
In my recent technical leadership role, I architected cloud-based and serverless platforms using AWS, Spring Boot, Kafka, and Kubernetes, helping improve loan processing speed by 35%, reduce infrastructure costs by 30%, and improve approval accuracy by 15%. I have also designed secure systems for managing sensitive customer data, implemented CI/CD automation, mentored developers, and delivered enterprise solutions in highly regulated environments.
I can help you with:
Backend and full stack application development
React / Next.js web application development
Node.js API development
Java Spring Boot microservices
REST API and GraphQL API development
AWS cloud-native application development
AI feature integration into existing applications
Kafka / RabbitMQ / ActiveMQ integration
Database design and query optimization
Legacy system modernization
CI/CD setup and deployment automation
Performance tuning and troubleshooting
Technical architecture and code review
I believe in delivering clean, maintainable, secure, and production-ready solutions with proper documentation, testing, logging, and best engineering practices.
Let’s connect if you need a reliable full stack developer who can design, build, troubleshoot, and deliver modern Java, React, Node.js, AI, and cloud-based applications.
Apache Camel
Artificial Intelligence
Web Development
Product Development
Java
JavaScript
NodeJS Framework
React
Vue.js
Hibernate
Apache Maven
Apache ActiveMQ
Apache Cassandra
MongoDB
ExpressJS
Mohamed E.
Cairo, Egypt
$15/hr
5.0
9 jobs
🚀 I help startups and enterprises build scalable, production-ready software with a strong focus on Java, Spring Boot, and modern backend architecture.
As a Software Engineer, I have designed and delivered systems ranging from start-up MVPs to enterprise and government platforms serving thousands of daily users. My expertise is cantered around building clean, maintainable, and high-performance backend applications, while also collaborating across the full software stack whenever projects require it.
What I can help you build:
✔ Java & Spring Boot Applications
✔ REST APIs & Backend Services
✔ Microservices Architecture
✔ Authentication & Security (JWT, OAuth2, Keycloak)
✔ Event-Driven Systems (Kafka, RabbitMQ)
✔ Database Design & Optimization
✔ Performance Optimization
✔ System Integration
✔ Cloud-ready Applications
✔ Software Architecture & Code Refactoring
Technologies I work with include Java, Spring Boot, Spring Security, Hibernate, PostgreSQL, MySQL, MongoDB, Redis, Kafka, RabbitMQ, Docker, Camunda, Keycloak, AWS, and modern observability tools.
Beyond my primary backend expertise, I have also delivered successful projects using Python, FastAPI, Django, React, Next.js, Flutter, and Supabase whenever they were the right technology for the job.
🌟 Highlights
• Architected and developed the complete backend microservices platform for "Crewpr", a Dubai-based startup, designing 10+ microservices, integrating multiple third-party services, and building a scalable production system serving thousands of active users.
• Contributed to digital transformation projects for Irish government organizations, including Enterprise Ireland, NEH, and Startup Ireland, building secure and scalable backend systems.
• Improved the performance and scalability of Yugo, a large-scale European student accommodation platform, by developing backend features and integrating external hospitality systems including RentCafe, Student Suite, and Entrata.
Software Development
Java
Redis
Spring Framework
MySQL
NoSQL Database
MongoDB
Spring Security
Hibernate
PostgreSQL
Microservice
API Development
API
API Integration
REST API
Lex B.
Washington, District Of Columbia
$78/hr
5.0
19 jobs
Dear client! My name is Lex, I am am AWS Engineer.
Let me ask you: did you have it all on Upwork? Contractors who go offline for days without notice? Freelancers ruined your production environments? Agencies knowing what you need better than you? Indian folks who don't have a clue about a single thing written on their profiles?
My morals are different.
⭐️ I am always on for you. My response SLA is minutes. Not hours. Not days. Minutes.
⭐️ My consulting style is gentle and non-invasive. You always have the final say.
⭐️ I am a narrow specialist: AWS is the only thing I sell here, but be certain that I am the best in my league.
This is some of things I enjoy:
✅ Web and mobile cloud-native microservice and serverless architectures (AWS)
✅ Cloud solutions cost reduction
✅ External API providers and COTS systems integration using Apache Camel and n8n
✅ Data pipelines, ETLs, ELTs
✅ Bespoke technology assessments
✅ Fully autonomous AI agents
My Technology Background
✅ Industry-standard enterprise Java stack: Spring Boot, Hibernate, Apache Camel
✅ Experience with Apache Kafka, ElasticSearch, Redis
✅ Exposure to front-end stack and paradigms: Angular, React, micro-frontends, SPAs
✅ Data stores: PostgreSQL, MySQL, MongoDB
✅ Cloud providers: Amazon Web Services
✅ Standards and protocols: OpenAPI, REST, Json RPC, GraphQL, Mambu, n8n
Amazon API Gateway
Performance Optimization
Amazon Web Services
API Integration
Java
Cloud Architecture
Containerization
DevOps
Auth0
OKTA
PostgreSQL
Amazon ECS for Kubernetes
Divyansh M.
Jodhpur, India
$25/hr
5.0
3 jobs
When your backend is breaking under load, your microservices are drifting, or your APIs aren't talking to each other, I'm the engineer who fixes it without breaking everything else.
I build and maintain production-grade systems using Java Spring Boot, React, Node.js, and cloud-native infrastructure. My work runs at scale:
Microservices handling 20,000+ concurrent users (Spring Boot + Kafka + Kubernetes)
REST APIs serving 50,000+ monthly users with clean contracts and error handling
CI/CD pipelines on GitHub Actions and Jenkins with automated test gates
AWS deployments (EC2, EKS, ECR, ALB) with zero-downtime rolling releases
Elasticsearch integration cutting search response times from 800ms to under 200ms
OAuth 2.0 + TLS security reducing vulnerability incidents by 70%
What I help with:
Java Spring Boot microservices, build, fix, optimize
React frontend connected to backend APIs
Kafka event-driven architecture
Docker + Kubernetes deployments
AWS cloud infrastructure
CI/CD pipeline setup and maintenance
API integration and debugging
100% Job Success · Rising Talent · 0-4hr response time
If your system is slow, broken, or needs scaling, message me and I'll tell you exactly what's wrong.
Java
Spring Boot
React
JavaScript
Next.js
PostgreSQL
MySQL
Docker
RESTful API
MongoDB
Redis
API Integration
Apache Kafka
Kubernetes
AWS CodeDeploy
GitHub
Jenkins
CI/CD
Microservice
TypeScript
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