Hire the Best C# Developers & Programmers
in Portugal

I’m a full-fledged game developer and game designer, handling every part of a game’s pipeline: from first idea to final build. I handle code, game design, systems, and art, shaping them so everything feels intentional, smooth, and connected. I write gameplay code, build systems, tune mechanics, and make the creative calls that keep a game feeling alive and cohesive. I’ve shipped games and I know what it takes to turn ideas into playable polished experiences that players will enjoy and come back to. I live in Unity and Unreal working with C#, C++, Blueprints, and handle gameplay systems, combat, AI, physics, animation, UI, multiplayer and networking. I’ve shipped games for PC, console, and mobile. As a game designer, I'm involved in game mechanics, progression, combat balance, pacing, controls, game design document creation, onboarding and retention. Game design isn't just a title, it's my day-to-day. I also get hands-on with art and presentation: UI, HUD, menus, lighting, scene setup, 2D/3D asset creation and integration. I make sure design, code, and visuals runs smooth and coherent. So, what are we waiting for? Let’s make a game people won't stop talking about! 🚀

I’m a Unity developer working with C#, mainly focused on gameplay systems like abilities, progression, UI, and core game logic. I’ve built features from scratch and also worked inside existing projects, so I’m comfortable both creating systems and improving what’s already there. I’ve worked on multiplayer and system-heavy features, and I care a lot about making things feel smooth, responsive, and easy to iterate on. I also use tools like ChatGPT and Claude to speed up development when it makes sense, while keeping everything clean and properly structured. If you need help building or refining gameplay systems, feel free to reach out.

I code and help translate business needs into technical solutions. With over 15 years of experience, I’ve helped multiple startups solve complex technical challenges. Whether you need someone who can quickly integrate with your team or take ownership as a solo developer, I adapt fast. Here’s what I can help you with: - Collaborating with startups as a full-stack developer to create or extend your digital products. - Integrating APIs into applications - Extending APIs - Customising Shopify / WooCommerce (custom code, beyond off-the-shelf plugins)

Startups, enterprises and public-sector organizations bring me in when the product needs strong technical decisions, not just execution - production AI systems, SaaS platforms and fintech, from architecture to live deployment. Most engagements start with a fixed-price design phase that defines architecture, scope and roadmap, then convert into fixed milestones, so delivery stays structured and budget predictable. Rate $125-150/hr depending on complexity; most work is delivered as fixed-price milestones. What I specialise in: AI/LLM systems - RAG pipelines, multi-tenant AI assistants, agent orchestration, Claude/OpenAI integrations, structured outputs, eval pipelines. SaaS platforms - multi-tenant architecture, subscription billing, RBAC, admin backends, scalable APIs across web and mobile. Fintech/compliance - ACH, Stripe Connect, idempotent payment webhooks, audit logging, GDPR-compliant data. Govtech/regulated - transparency platforms, donor-funded compliance, multi-language reporting. Blockchain/Web3 - Solana smart contracts, SPL tokens, DeFi integrations. Selected results (live demos and links in the Portfolio section): Minerva (active production) - multi-tenant AI assistant platform architected end to end: organizations upload document libraries and deploy embeddable chatbots on their own knowledge base. Hybrid retrieval (BM25 + dense vector + semantic), Entra ID + RBAC + MFA, full tenant isolation, golden-query eval harness in CI. NestJS, Next.js, Azure OpenAI. Diginak.ai (active production, lead architect) - logistics document automation that auto-processes ~78% of inbound PDF/CSV/Excel with zero human touch; the remainder routes to human review with confidence scores. Claude API + tool use, state-machine workflow engine, retry/idempotency, 850+ automated tests. NestJS, PostgreSQL. Walletta AI Cashier (concluded May 2026, 5-star) - real-time voice agent with sub-500ms perceived latency. Claude + GPT-4o orchestration, structured tool calls with confidence-scored routing, persistent WebSocket, retry with circuit breaker. LiveKit, Deepgram, ElevenLabs, NestJS. Damen Capital Portal (concluded May 2026, 5-star) - loan-servicing portal for a private lender with the full ACH lifecycle: tokenization, NACHA returns R01-R85, HMAC-verified idempotent webhooks, append-only audit log, OAuth 2.0 + RBAC, scheduled reconciliation. NestJS + Fastify, Supabase. PulseYourBiz (active production) - all-in-one SaaS for service providers: bookings, payments, invoicing, CRM, analytics. Five-app Turborepo monorepo, Stripe Connect payouts, idempotent webhooks, React Native mobile. 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 in four languages. NestJS, Next.js, PostgreSQL + RLS. Also shipped: no-code Solana token/DeFi platform with 1,500+ users (SwapForge), offline-first clinical decision support for underserved regions (ExtendYourClinic), multi-tenant VetSaaS with PostgreSQL RLS isolation (acti.vet), React Native apps live on both app stores (ForroAI). Tech stack: Backend: Node.js, NestJS, Python, FastAPI, 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: Azure (Functions, OpenAI, Entra ID, Key Vault, App Insights, Bicep IaC), AWS, GCP, Docker, GitHub Actions. Databases: PostgreSQL, MongoDB, Redis, Supabase, RLS tenant isolation. Blockchain: Solana, Anchor, SPL, Jupiter, Solidity, EVM. Working model: 25-30 hrs/week across a small number of parallel engagements. Best fit when the product needs architectural ownership - not a fit for quick fixes or one-off tasks.

I'm a Geospatial Engineer with 10+ years of experience in web development and spatial technologies, working both in full-time positions and as a freelancer. I specialize in frontend development, particularly for mapping and location-based applications, but I'm also highly capable of handling backend development and non-geospatial projects. I have worked with renowned companies such as Esri and Dotgis—at Dotgis, I co-led frontend development for several key projects, shaping both their current and upcoming solutions. As a freelancer, I have had several clients over the years. Also, I have done other jobs outside of the upwork platform, so not all of them are in my upwork portfolio. Currently, I work with GeoInsight, but I'm open to new opportunities and collaborations. Core Expertise Frontend Development: Expert in JavaScript and React.js, with deep experience building responsive, performant, and interactive web mapping applications. I'm also fully capable of developing non-mapping web apps using vanilla JS and modern frameworks like Next.js. Backend Development: Proficient in building RESTful APIs using Node.js and Rust, with a strong understanding of backend architecture, performance, and deployment. Geospatial Technologies: Strong background in GIS software (ArcGIS, QGIS), remote sensing, spatial databases (PostgreSQL/PostGIS), and various mapping libraries (Mapbox, Leaflet, OpenLayers, Deck.gl, ArcGIS JS API, Google Maps API). I have excellent skills in processing and analyzing location-based and satellite data.. Technologies & Tools Languages: JavaScript, HTML/CSS, SQL, Rust, Python Databases: PostgreSQL/PostGIS, Duck.db Frameworks & Libraries: React.js, Next.js, Mapbox GL, Deck.gl, Leaflet, OpenLayers, ArcGIS API for JavaScript, Google Maps API Tools & Platforms: Docker, Git, Webpack, Node.js, REST APIs, unit/integration testing, git, CI/CD deployment Why Work With Me I'm a versatile developer with a solid blend of geospatial knowledge and modern web development expertise. I'm highly motivated, work well under pressure, and am committed to delivering high-quality, scalable, and efficient solutions. Whether you're building a custom mapping tool, a data visualization platform, or a full-stack web app, I bring both technical depth and domain insight to the table. If you're looking for someone who understands both code and location data, I bring the best of both worlds: full-stack web development + deep geospatial expertise. Let’s work together to bring your project to life!

.NET Developer with 10 years of experience developing web, desktop, mobile apps, windows services applications, web services, and APIs using C#, .NET Framework, .NET Core, Entity Framework, Entity Framework Core, Xamarin Forms, Windows Forms, ASP.NET Web Forms, ASP.NET MVC, ASP.NET Web API, WCF, HTML5, CSS3, JavaScript, JQuery, SQL Server, Oracle, Unity. Recognized for exceptional ability to improve application code and performance. Personal capabilities: - Adapt quickly to diverse management and clients style - Results-oriented individual - Demonstrated capacity to successfully manage multiple projects and deadlines - Strong analytical skills, easily assess conditions and implement appropriate intervention - Refined technical analysis of the code for improvement purposes and for future maintenance to be easier to implement Microsoft Certifications - MTA - 98-361 Software Development Fundamentals, License Number: G667-6407 - MCSA - 70-483 Programming in C #, License Number: G799-7907