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$65/hr
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🚀 Senior Backend Engineer | Golang | Java | Python | AI-Augmented Development
Senior Backend Engineer with 15+ years of experience building scalable, secure, and production-grade backend systems for SaaS, fintech, analytics, and real-time platforms.
I specialize in Golang and Python, designing high-performance APIs, microservices, and event-driven systems with a strong focus on reliability, security, and clean architecture.
AI-Ready Workflow
I actively use Claude Code, Windsurf AI, and GitHub Copilot in my daily development process to accelerate delivery, improve test coverage, reduce bugs, and ship high-quality features faster without increasing technical debt.
Core Expertise
• REST & gRPC API development
• PostgreSQL, Redis, distributed systems
• AWS, Docker, Kubernetes
• OAuth2, webhooks, payment integrations
• Performance optimization & production hardening
I care about shipping reliable systems, writing clean maintainable code, and delivering real business outcomes.
Let’s build something scalable and production-ready.
$70/hr
$0 earned
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Software Engineer | Web & App Developer | Trading Bots & Business Apps
I help businesses turn ideas into powerful, intuitive, and scalable software solutions. Skilled in Python, JavaScript (Node.js, React), Java, C++, SQL, and Solidity, I build web & mobile apps, custom automation scripts, trading bots, and financial applications that deliver real results.
Whether you are reimagining a new tech, solution, or want to stand out in your current business, I am here to help you every step of the way to realize that vision with:
Clean, scalable code | Client-focused solutions | Transparent communication
Your vision + my skills = excellent results.
United States
$94/hr
$0 earned
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Software Engineer - AI Products & Evaluation
Software engineer who builds the measurement layer for systems that resist testing. Ten years spanning LLM evaluation and agent products, manufacturing test frameworks, and industrial process control. Currently the first engineering hire at an AI developer-tools startup, where I built the offline evaluation harness and cost attribution infrastructure behind an agentic PR review product.
United States
$80/hr
$0 earned
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Full-Stack .NET Developer | ASP.NET Core | Flutter Mobile Apps | MS SQL
I’m a full-stack developer specializing in building reliable, scalable web applications with ASP.NET / .NET Core and cross-platform mobile apps with Flutter.
What I work with every day:
Backend: ASP.NET Core, C#, Web APIs, Entity Framework
Frontend: JavaScript, modern web technologies
Database: Microsoft SQL Server (advanced queries, optimization, stored procedures)
Mobile: Flutter (iOS & Android)
I help clients turn ideas into working products — whether that’s a new web application, REST APIs, database-backed systems, or Flutter mobile apps that connect to .NET backends.
How I work:
Clear communication and regular updates
Clean, maintainable code
Focus on performance, security, and usability
Comfortable with both short fixed-scope projects and longer collaborations
I take on side projects while maintaining high quality and meeting deadlines. If you need a solid .NET + SQL solution, a Flutter mobile app, or a full-stack feature built end-to-end, I’d be happy to help.
Feel free to message me with your project details — I’ll respond quickly with honest feedback on scope and timeline.
$80/hr
$0 earned
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I’m a Senior AI & Software Engineer with 9+ years of experience building scalable, production-ready applications across AI, backend, frontend, data, and cloud infrastructure.
I specialize in developing and integrating AI-powered features into real-world products, including LLM applications, semantic search, recommendation systems, NLP services, intelligent automation, and ML inference APIs.
My core expertise includes:
• AI/LLM integration and AI-powered applications
• Python, FastAPI, JavaScript, and TypeScript
• React and Angular frontend development
• REST APIs, microservices, and distributed systems
• Semantic search and recommendation systems
• Data processing, ETL pipelines, Pandas, and NumPy
• PostgreSQL, SQL, and data modeling
• AWS and Google Cloud Platform
• Docker, CI/CD, monitoring, and observability
• API performance, scalability, and production reliability
I can take a project from initial requirements through architecture, development, testing, deployment, and production optimization.
Whether you need an AI-powered SaaS feature, an LLM integration, a scalable backend API, an internal AI tool, or a complete full-stack application, I focus on delivering clean, maintainable solutions that work reliably in production.
I value clear communication, practical engineering decisions, and delivering measurable results—not just prototypes.
$77/hr
100%
Job Success
$100K+ earned
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I have a 15+ years reverse engineering experience.
My experience includes:
- reversing of Windows/Linux/OS X/Android/iOS applications
- almost every debugger/decompiler: IDA/Hopper/lldb/etc.
- reversing data formats and network protocols
- modifying, patching and adding features to compiled code
- creating emulators
- etc.
I can create software but I'm only interested in Reverse Engineering jobs here on Upwork.
France
$100/hr
$0 earned
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I am a Full Stack Developer with a focus on Java and Angular, blending technical expertise with agile methodologies to create robust and scalable solutions. With experience in end-to-end application development, I optimize performance and manage incident resolution and application maintenance effectively. I am adept at understanding business needs and translating them into impactful digital solutions. My background includes working on diverse projects that require a keen eye for detail and a commitment to quality. If you need a developer who can navigate complex challenges and deliver polished results, I am ready to help. Let's discuss your project and find the best ways to achieve your goals.
$100/hr
$0 earned
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Angular Developer with 3+ years of experience in Angular (8-18),
building scalable SPAs and enterprise applications. Skilled in
TypeScript, RxJS, REST APIs, and performance optimization. Open
to Angular / Frontend roles in Hyderabad, Hybrid, or Remote.
Turkey
$100/hr
$0 earned
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After 1.6 years as a traditional Frontend Developer, I transitioned to
AI-driven development (vibe coding) to build and launch my own
mobile game, Cebinden (via Flutter). It has achieved 20,000+
downloads, 1,000+ DAU, and a 50%+ retention rate. Recently, I
contract-vibe-coded UAP Club for Omu Labs, handling everything
from frontend to secure backend and cost optimization. I specialize in
shipping safe, cost-efficient, and well-designed apps at lightning
speed.
$75/hr
$0 earned
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I build AI-powered automations and data pipelines that do the repetitive work, then I personally verify every deliverable before it reaches you. AI does the heavy lifting on my side. I stay accountable for accuracy, structure, and fitness for purpose.
What I build:
- RAG systems and Claude/GPT integrations (chat over your documents, knowledge bases, Q&A tools)
- Data extraction and ETL pipelines (pull data from websites, APIs, PDFs, or government sources into clean, structured output)
- Workflow automation (Python scripts, API integrations, Airtable systems, scheduled jobs)
- Document and report generation pipelines (turn raw data into formatted deliverables automatically)
Proof I ship: I built ReadbackAI, an FAA test prep app running retrieval augmented generation on Claude with a Flask backend and iOS client, and SamBOT, an automated pipeline that extracts and analyzes federal contract data from SAM.gov daily.
Why the QA promise is credible: I spent 20 years in Navy Medicine, retiring as a Commander. I directed IT and operations across 50+ facilities in 12 countries and led a regional deployment of a $4.3B electronic health record program with zero downtime. I know what accountable delivery looks like when errors are not an option.
How I like to work: fixed-price, clearly scoped deliverables. You describe the outcome, I define the scope and price, you get a working result with documentation. If your project prohibits AI-assisted work, I am not the right fit and will tell you so upfront.