Hire the Best LINQ Developers
in Portugal
Charneca de Caparica, Portugal
Looking to bring your next great idea to life? Or, maybe you already have an awesome piece of software built and want to give it a new twist. ✅ Top Rated Software Development ✅ Expert in Task Automation and API Integrations ✅ Microsoft Certified Professional with 10+ years of experience ✅ Trained on the latest SW developer trends, tools and tech ✅ Deliver high quality software based on SOLID architecture principles ✅ Get robust software that stands the test of time TESTIMONIALS There is no secret why I consistently receive positive feedback, including: ✌️ "Amazing service. Highly recommended!" ✌️ "Always very professional and communicative." ✌️ "Easy to work with, highly skilled and honest straight forward ideas." ✌️ "Once again excellent job and service for our project! Always professional and timely!" ✌️ "Very sharp. Awesome to work with. Clear and direct. Lot of know how! " WHAT I OFFER ✅ Back-end Software Development ✅ API Integrations and Automation Development ✅ Web App Development ✅ Software Architecture Consulting ✅ MVP Product Development ABOUT ME Technically versatile software engineer with a passion for building data-driven applications with 10+ years of development experience. Successful working as a remote software engineer, collaborating in cross-functional teams and demonstrating high-levels of social, cultural and emotional intelligence to successfully deliver on business objectives SKILL SET ► Programming Languages C#, SQL, JavaScript, TypeScript, HTML, CSS/Sass ► Libraries & Frameworks ASP.NET MVC, .NET Core, Entity Framework, LINQ, WPF, Angular, React, jQuery ► Tools & Platforms MSSQL, MySQL, MongoDB, Elastic Search, Azure, PowerShell, NuGet, TeamCity, Octopus Deploy, TFS, Git 🔥🔥🔥 ALL SET - LETS GO! Done reading and want to get get started? Then click the "Hire" or "Invite"
- LINQ
- SQL
- MongoDB
- ASP.NET Core
- C#
- TypeScript
- Elasticsearch
- AngularJS
- .NET Framework
- Microsoft Azure
- Azure Cosmos DB
- Microservice
- Azure Service Fabric
- Microsoft SQL Server
- .NET Core
Queluz, Portugal
I design and build production-grade AI systems, SaaS platforms, and fintech applications - from architecture to live deployment. Startups, enterprises, and public-sector organizations bring me in when a product requires strong technical decisions, not just execution. I lead from architecture: most engagements start with a design phase that defines system, scope, and roadmap, then convert into fixed milestones so delivery stays structured and budget predictable. Rate $100-140/hr depending on complexity. 25-30 hrs/week, parallel-projects model. Not a fit for quick fixes or one-off tasks. What I specialise in: AI/LLM systems - RAG pipelines, multi-tenant AI assistants, multi-modal generative platforms, Claude/OpenAI integrations, agent orchestration, eval pipelines. SaaS platforms - multi-tenant architecture, subscription billing, RBAC, admin backends, scalable API design across web and mobile. Fintech/compliance - payment integrations, ACH, Stripe Connect, GDPR-compliant data, audit logging. Govtech/regulated - transparency platforms, donor-funded compliance, pseudonymisable schemas, multi-language tools. Blockchain/Web3 - Solana smart contracts, DeFi, SPL tokens, wallet integrations. Selected projects (live demos and portfolio links available in the Portfolio section below): Minerva (active production) - multi-tenant AI assistant platform architected end to end. Organizations upload document libraries and deploy embeddable AI chatbots from their own knowledge base. NestJS, Next.js, Azure OpenAI, Cognitive Search hybrid retrieval (BM25 + dense vector + semantic), Entra ID + RBAC + MFA, Key Vault, App Insights audit logging, full tenant isolation, golden-query eval harness in CI. Diginak.ai (active production) - logistics document-processing automation, lead architect. State-machine workflow engine processes PDF/CSV/Excel with Claude API + tool use, retry/idempotency, structured outputs (Zod), confidence-scored auto-routing to human review, observability per step. ~78% production accuracy. NestJS, PostgreSQL, Docker. Walletta AI cashier PoC (demo) - voice agent with Claude + GPT-4o orchestration, structured tool calls + confidence-scored routing, persistent WebSocket, retry-with-circuit-breaker. LiveKit, Deepgram, ElevenLabs, NestJS. Sub-500ms perceived latency. acti.vet (active production) - multi-tenant VetSaaS, three surfaces (admin/clinic/customer), PostgreSQL RLS tenant isolation, PWA. Next.js, NestJS, Supabase. PulseYourBiz (active production) - all-in-one SaaS for service providers: bookings, payments, invoicing, CRM, analytics. Five-app Turborepo monorepo, React Native mobile, Stripe Connect payouts, idempotent webhooks, audit log, multi-tenant via Docker + GitHub Actions. ProveYourImpact (production) - multi-tenant governance/compliance platform for donor-funded projects in PALOP countries. 20 API modules, 9-role RBAC, configurable workflow engine, audit log, EU/UNDP/World Bank report generators across four languages. NestJS, Next.js, PostgreSQL + RLS, Redis, MinIO. ExtendYourClinic (production) - offline-first clinical decision support SaaS for health workers in underserved regions. React Native tablet for patient triage + AI-assisted assessments, offline + cloud sync. NestJS, PostgreSQL, Stripe, on-device LLM. Full GDPR compliance. ForroAI (Apple App Store + Google Play, beta post-April 2026) - React Native production app for Cape Verdean and Sao Tome cultural language preservation. Shipped to both stores. Damen Capital Portal (concluded May 2026, lifetime $89K+) - private lender loan servicing with full ACH integration: tokenization, NACHA R01-R85, idempotent webhooks (HMAC + unique constraint), append-only audit log, OAuth 2.0 + RBAC, scheduled cron reconciliation. NestJS + Fastify, Supabase. Deepshi AI (production) - generative AI platform combining conversational AI, image, video, music generation with social community. Multi-model chat, AI characters, subscription monetization via Stripe and crypto. Next.js, TypeScript, Vercel. SwapForge (production) - no-code Solana token launch platform. SPL token factory, liquidity management, swaps via Jupiter aggregator. Tech stack: Backend: Node.js, NestJS, FastAPI, Python, REST, GraphQL. Frontend: React, Next.js, React Native, Expo, TypeScript, Tailwind. AI: Claude, OpenAI, RAG, pgvector, Azure Cognitive Search, structured outputs (Zod/Pydantic), prompt caching, tool use, eval harnesses in CI. Cloud: AWS, GCP, Azure (Functions, OpenAI, Entra ID, Key Vault, App Insights, Bicep IaC), Docker, GitHub Actions. Databases: PostgreSQL, MongoDB, Redis, Supabase, RLS tenant isolation. Blockchain: Solana, Anchor, SPL, Jupiter, Solidity, Ethereum, EVM.
- SQL
- JavaScript
- GitHub
- Mongoose
- Automated Testing
- Websockets
- Angular
- Redux Saga
- Software Architecture & Design
- Front-End Development
- Next.js
- NestJS Development
- Blockchain
- DApp Development
- AI Consulting
Alges, Portugal
🚀 Top-Rated-Plus QA Tester | Software Engineer ✔️ 5+ years of experience in Quality Assurance, Software Testing, and IT solutions ✔️ Skilled in manual testing using real devices (iOS, Android, Windows, macOS) ✔️ Familiar with automated testing concepts and actively learning automation frameworks ✔️ Multilingual support for international projects 🌍 Additional Skills & Expertise - Full-Stack .NET Developer – Experienced in backend & frontend development - Adobe Photoshop Certified – Graphic design & digital editing - PDF Editing & Document Management – Advanced document handling - CRM Management – Proficient in maintaining and optimizing CRM platforms Committed to delivering high-quality software and continuously improving. Let’s connect and collaborate! 🚀
- JavaScript
- ASP.NET
- Bug Reports
- Web Testing
- Manual Testing
- Software QA
- Functional Testing
- Software Testing
- Quality Assurance
- QA Automation
- Software Development
- Quality Control
- Quality Audit
- Total Quality Management
- Product Stability
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