Java Backend Engineer | Microservices · Spring Boot · Fintech & Enterprise Systems I build backend systems that handle real load — trading platforms, HR infrastructure, and e-commerce — with a focus on reliability, observability, and clean architecture. Over 4 years across fintech companies (Flatex DeGiro, ThinkMarkets, UKG), I've shipped production features across dozens of release cycles with zero rollbacks, cut incident diagnosis time from 3+ days to under 8 hours through distributed tracing, and optimized database queries reducing execution time by up to 60%. My core stack: Java · Spring Boot · Microservices · PostgreSQL · Elasticsearch · Kafka · Redis · Docker What I bring to freelance projects: Microservice design and implementation from scratch REST API development and third-party integrations Performance optimization (DB queries, caching, indexing) CI/CD setup with Jenkins and Docker Production-grade code with proper testing (JUnit 5, Mockito) I also built and shipped my own e-commerce platform end-to-end (shisharkaa.bg) — Adyen payments, Econt logistics, Redis caching, JWT auth — so I know what it takes to own a project fully, not just contribute to one. If you need a backend engineer who ships clean, tested, production-ready code — let's talk.

I'm WordPress Developer, Web Designer and Logo Designer with 15 years of experience. I help individuals and businesses with turning their visions into custom-built WordPress sites.

I'm a versatile and results-driven Full-Stack Developer with over 3 years of experience building robust digital products—from mobile apps to full-scale platforms and business websites. I lead development both independently and as part of fast-paced teams. 💼 Current Roles: 🔹 Developer at a Hong Kong-based startup, co-founded by an ex-cofounder of a multi-million-dollar e-signing platform. I’m responsible for architecting scalable systems and delivering complex, high-performance features. 🔹 Founder of a local web development agency, delivering modern, SEO-optimized WordPress websites to small and medium-sized businesses. 🧠 Core Focus Areas: - Building scalable platforms that handle complex data flows and high user demand - Designing seamless user experiences, prioritizing performance and clarity across web and mobile - Implementing advanced search systems, including deep filtering, ranking logic, and instant results for large datasets - Developing real-time location and tracking features with efficient data syncing across devices - Delivering cross-platform solutions, including mobile apps and desktop tools, all with a unified codebase - Collaborating closely with stakeholders, translating business goals into reliable, maintainable software 🛠 How I Work: - Agile and goal-oriented, using structured tools to track and deliver progress - Clear communication - daily check-ins available on request Whether you're launching a new platform, building an MVP, or modernizing an existing product, I bring a blend of technical depth, product thinking, and real-world delivery experience. 📩 Let’s connect and talk about how I can help you build something great.

I’m a Full-Stack Developer with 4+ years of experience specializing in building scalable web applications and backend services. Whether you're looking to develop a modern web app, optimize your backend performance, or integrate complex business logic, I can help bring your project to life. What I Offer: Frontend Development: React.js, JavaScript, TypeScript, Vue.js Backend Development: Java, Spring Boot, Node.js, Express.js Database Management: PostgreSQL, MySQL, SQL API Development & Integration: RESTful APIs, GraphQL Performance Optimization & Code Refactoring I provide end-to-end project management, from initial planning to deployment, ensuring high-quality, maintainable code. Clear and consistent communication is key to a successful collaboration, so let’s discuss your project needs and build something great together! 🚀

Is your infrastructure keeping you up at night? Whether it's an unreliable deployment pipeline, a Kubernetes cluster you don't fully trust, or a cloud bill that keeps growing without explanation, I help engineering teams fix that. I've done this at serious scale, including for Microsoft and Banco Santander, as well as fintech startups, SaaS platforms, and digital agencies. 9 years across those environments means I've seen what breaks at scale, and I know how to build systems that don't. What I can do for you: - Design and implement SRE practices from scratch (SLIs/SLOs, error budgets, incident response) - Harden and scale Kubernetes (K8s) workloads on AWS, GCP, or Azure - Build CI/CD pipelines that development teams actually trust and use - Set up observability that tells you why something broke, not just that it broke (Prometheus, Grafana, Dynatrace, OpenTelemetry) - Eliminate operational toil through Infrastructure as Code and automation (Terraform, Ansible) Structured offerings with a defined outcome: - Cloud Cost Optimization Audit: I will review your AWS, GCP, or Azure spend, identify waste, rightsizing opportunities, and commitment gaps, then deliver a prioritized savings roadmap. Most clients recover my fee within the first month. - Multi-Tenant Architecture & Security Audit: I will assess your isolation model, RBAC, Kubernetes namespace strategy, network policies, cost allocation per tenant, and security guardrails, then deliver a gap analysis with concrete remediation steps. I hold a Certified Kubernetes Administrator (CKA) and Linux Foundation Certified Systems Administrator (LFCS) certification. I've worked across the full stack when needed so I understand what your developers are building, not just the infrastructure underneath it. EU citizen · Based in Bulgaria · English, Spanish & French · Available for EU, EEA, US, and Swiss contracts · B2B

I help businesses build scalable software solutions, automate workflows, and improve operational efficiency through technology. I am the founder of an IT services company specializing in custom software development, backend systems, API integrations, and automation solutions. I work with startups, entrepreneurs, and established businesses to transform ideas into reliable, production-ready software. My expertise includes: • Custom Web Applications • Backend Development • API Integrations • Process Automation • Cloud Infrastructure • AI-Powered Solutions I focus on delivering clean, scalable, and maintainable solutions that solve real business problems. I value clear communication, fast delivery, and long-term client relationships. My goal is simple: deliver high-quality work that creates measurable business value.

I might be the right fit for your project if you're aiming to create modern web applications/website or mobile applications for iOS and Android.

Building reliable, scalable web products - not just writing code. I'm a Full-Stack Ruby on Rails developer with 7+ years of experience delivering production-ready applications for EdTech and HealthTech companies. I help startups and growing teams build secure, maintainable SaaS platforms that scale with their users and business goals. Whether you're launching a new product or improving an existing one, I bring senior-level thinking to architecture, clean code, and reliable delivery - without the senior-level price tag. 🖥️ What I Build ● EdTech Platforms - Multi-tenant learning management systems, course portals, progress tracking, subscription billing, and role-based access for students, instructors, and admins ● HealthTech Applications - Secure, HIPAA-aware Rails backends, patient/provider portals, appointment systems, and data-sensitive API integrations ● SaaS Products - Subscription management, onboarding flows, analytics dashboards, and scalable multi-role architectures ● API Development & Integrations - RESTful APIs, third-party service connections (Stripe, Twilio, SendGrid, EHR systems, LMS APIs), and background job processing 🛠️ Core Tech Stack Ruby on Rails · Ruby · React · JavaScript · TypeScript · PostgreSQL · Redis · Sidekiq · AWS · Docker · Heroku · Git · RSpec · REST APIs 🏆 What I've Delivered ✔️ Built a multi-tenant EdTech platform with course management, progress tracking, and Stripe subscription billing - scaled to thousands of learners ✔️ Developed a HealthTech portal with secure role-based access, appointment scheduling, and third-party EHR API integration ✔️ Refactored legacy Rails applications, reducing load times and cutting technical debt to improve long-term maintainability ✔️ Designed and implemented CI/CD pipelines with GitHub Actions and Docker, cutting deployment time significantly ✔️ Integrated AWS S3, SES, and EC2 for scalable, production-grade infrastructure ✅ Why Clients Choose Me ✨ I think about the product, not just the ticket - I flag risks and suggest better approaches when I see them ✨ Clean, well-tested, documented code your future team can actually work with ✨ Realistic timelines, proactive communication, and no surprises ✨ Strong understanding of compliance-sensitive industries (data privacy, access control, audit trails) 📌 Best fit for: EdTech startups · HealthTech products · SaaS platforms · API-heavy backends · Legacy Rails modernization · Long-term product partnerships Ready to build something that works now and holds up later? Let's talk.

No matter if you sell crochet toys or spaceships, I can help your Shopify store take off in no time. For the last 10 years, I’ve focused solely on e-shops that are optimized for a higher conversion rate. Here is what sets me apart from other Upwork freelancers : ✅ A-Z Shopify solutions ✅ Design that stands out from the sea of sameness ✅ Coding Wizardry - I can develop anything you can think of ✅ SEO optimization ✅ Lightning-fast Speed optimization ✅ Conversion tracking If these benefits align with your ambitions, send me a message, and let’s start your 7-figure Shopify store.

I build WordPress websites that help small businesses get more inquiries, bookings, and clients — not just a nice-looking design. I specialize in: • WordPress websites built with Elementor • Clean, modern, mobile-friendly design • Business websites that clearly present services and generate inquiries or bookings I don’t just build websites — I create practical business tools that help you get real results, not just a nice design. Whether you need a brand new website, a redesign, or improvements to an existing WordPress site, I focus on clarity, usability, and conversion. If you’re looking for a reliable WordPress developer who understands business goals — let’s talk.