08/26/2026 updated
AT
100 % available
Senior Backend Engineer / Solution Architect / DevOps
Sant Pere de Ribes, Spain
Only remote
Engineer degree-Industrial Heat Power Engineering,IvanovoStatePowerEngineering University, 2004-2009About me
Senior .NET / DevOps Engineer with 15+ years of experience. C#, .NET, ASP.NET Core, PostgreSQL, REST APIs, Docker, Linux, Nginx and CI/CD. Strong in legacy modernization, integrations, architecture and production troubleshooting. Available for remote B2B/freelance projects.
AI AgentsLLMOpenAIArchitectureC Sharp (Programming Language)LinuxDevOpsPostgreSQLLinux AdministrationNGINXServer AdministrationGitGitlab-ciApi GatewayRestful Api
Backend Development & Solution Architecture
Over 15 years of experience in backend development using C#, .NET, and ASP.NET Core. Design and implementation of REST APIs, distributed and service-oriented systems, integration architecture, and legacy system modernization. Extensive work with Entity Framework / EF Core and system architecture for business-critical applications.
DevOps & Infrastructure Engineering
Comprehensive hands-on experience with self-hosted and on-premises infrastructure since approximately 2014. Setup and operation of Docker-based environments, Nginx reverse proxies, GitLab CI/CD pipelines, SSL/TLS, deployment automation, production monitoring, backup and recovery processes, and Linux server administration.
Database Design & Administration
Proficient in PostgreSQL and MySQL, including database design and optimization, backup and restore procedures, migration management, and long-term production maintenance for business-critical and medical data systems.
CI/CD Pipeline Design & Automation
Design, implementation, and maintenance of CI/CD pipelines using GitLab CI/CD and self-hosted GitLab. Automated builds, deployments, database migrations, and operational tasks using Bash scripting and custom deployment automation tools.
Security & Secure Operations
Application of secure deployment practices, SSL/TLS certificate management, access and secrets management principles, and CI/CD security concepts. Experience operating systems containing sensitive business and medical data.
AI / LLM Integration
Practical experience running LLMs on self-hosted and on-premises infrastructure for local data processing and automation. Integration of OpenAI and other cloud-based AI APIs into software products and engineering workflows. Evaluation of local versus cloud AI solutions.
Fintech & System Integration
Experience with cryptocurrency exchange integrations including Binance and regional exchanges, cryptocurrency wallet compliance and risk checks, KYC integrations via Sumsub, SEPA, SWIFT, and various external financial APIs and services.
Frontend Technologies
Working knowledge of Vue.js / Vue 3, JavaScript, and TypeScript for frontend development within full-stack project contexts.
Scripting & Automation
Extensive use of Bash scripting for deployment automation, scheduled and triggered operational tasks, and infrastructure management. Additional experience with Python for scripting and automation purposes.
Medical Information Systems
Architecture and development of medical information systems, including integration with external medical and business systems, handling of sensitive medical data, and long-term modernization of existing software.
Over 15 years of experience in backend development using C#, .NET, and ASP.NET Core. Design and implementation of REST APIs, distributed and service-oriented systems, integration architecture, and legacy system modernization. Extensive work with Entity Framework / EF Core and system architecture for business-critical applications.
DevOps & Infrastructure Engineering
Comprehensive hands-on experience with self-hosted and on-premises infrastructure since approximately 2014. Setup and operation of Docker-based environments, Nginx reverse proxies, GitLab CI/CD pipelines, SSL/TLS, deployment automation, production monitoring, backup and recovery processes, and Linux server administration.
Database Design & Administration
Proficient in PostgreSQL and MySQL, including database design and optimization, backup and restore procedures, migration management, and long-term production maintenance for business-critical and medical data systems.
CI/CD Pipeline Design & Automation
Design, implementation, and maintenance of CI/CD pipelines using GitLab CI/CD and self-hosted GitLab. Automated builds, deployments, database migrations, and operational tasks using Bash scripting and custom deployment automation tools.
Security & Secure Operations
Application of secure deployment practices, SSL/TLS certificate management, access and secrets management principles, and CI/CD security concepts. Experience operating systems containing sensitive business and medical data.
AI / LLM Integration
Practical experience running LLMs on self-hosted and on-premises infrastructure for local data processing and automation. Integration of OpenAI and other cloud-based AI APIs into software products and engineering workflows. Evaluation of local versus cloud AI solutions.
Fintech & System Integration
Experience with cryptocurrency exchange integrations including Binance and regional exchanges, cryptocurrency wallet compliance and risk checks, KYC integrations via Sumsub, SEPA, SWIFT, and various external financial APIs and services.
Frontend Technologies
Working knowledge of Vue.js / Vue 3, JavaScript, and TypeScript for frontend development within full-stack project contexts.
Scripting & Automation
Extensive use of Bash scripting for deployment automation, scheduled and triggered operational tasks, and infrastructure management. Additional experience with Python for scripting and automation purposes.
Medical Information Systems
Architecture and development of medical information systems, including integration with external medical and business systems, handling of sensitive medical data, and long-term modernization of existing software.
Experience
Professional experience10+ years
Freelancer since2014
Languages
EnglishBasic knowledgeRussianNative speakerSpanishBasic knowledge
Project history
Participated in building a CRM platform from the ground up. Responsibilities included system and solution architecture, technical requirements and specifications, selection and coordination of external and internal developers, building and organizing the development team, development process organization, backend and integration architecture, infrastructure and deployment decisions, testing and release processes, technical communication with business stakeholders and contractors, and production support and system evolution.
Responsible for architecture, backend development, infrastructure, integration, deployment, and technical delivery across multiple long-running software projects. Designed and developed backend services primarily using C# and .NET. Designed system architecture and database structures for business-critical applications. Built and maintained REST APIs and integrations with external systems. Worked extensively with PostgreSQL and other relational databases. Designed and maintained production infrastructure. Deployed and operated applications on self-hosted/on-premises servers. Introduced and maintained Docker-based application deployment. Configured Nginx, reverse proxies, HTTPS and network-level application routing. Built CI/CD processes and deployment automation. Operated self-hosted GitLab infrastructure and GitLab CI/CD. Automated operational and deployment tasks using Bash and other scripting tools. Managed application releases, production incidents, backups, migrations and troubleshooting. Launched multiple projects from initial concept to production operation.
Started with administration and maintenance of the company IT infrastructure and later moved into architecture and development of medical information systems. Responsibilities included backend development, medical information system architecture, database design and maintenance, integration with external medical and business systems, infrastructure administration, production deployment and support, automation of operational processes, handling systems with sensitive medical information, and long-term modernization and evolution of existing software.