09/20/2026 updated
100 % available
Principal Backend & Cloud Consultant | Technical Lead & CTO | 12+ Years Experience
Sofia, Bulgaria
Worldwide
Master's degree in IT Project ManagementJava (Programming Language)Application Programming Interfaces (APIs)Amazon Elastic Compute CloudCloud ComputingCloud EngineeringVirtual Private ServersDevOpsPostgreSQLMessaging Application Programming InterfaceRabbitMQCloud ServicesDigitaloceanBlockchainAzure Machine LearningZeroMQ (Concurrent Programming Libraries)
Backend Development & Microservices Architecture
Expertise in building high-concurrency backend systems using Java (Spring Boot, Security, Cloud, Data, WebFlux), Go, and Python. Proficiency in RESTful APIs, SOAP, Microservices Architecture, JUnit, Mockito, Testcontainers, Maven, and Gradle.
Cloud Engineering (AWS & DigitalOcean)
Deep knowledge of AWS services including EC2, S3, IAM, RDS, Lambda, CloudWatch, VPC, ECS, Fargate, EKS, ElastiCache, and DynamoDB, as well as DigitalOcean. Architecting and optimizing cloud-native ecosystems for maximum performance and cost-efficiency.
DevOps & CI/CD Pipelines
Strong background in DevOps practices using Linux, Docker, Kubernetes (Helm), Terraform, and CI/CD tools such as GitHub Actions, GitLab, Jenkins, and Drone CI. Designing automated pipelines that accelerate release cycles and ensure resilient, high-quality deployments.
Distributed Systems & Messaging
Hands-on experience with Kafka, RabbitMQ, Pulsar, ZeroMQ, WebSockets (STOMP), Amazon SQS, and SNS for building scalable, high-throughput distributed architectures.
Data Persistence & Databases
Proficiency with PostgreSQL, MySQL, Amazon Aurora, MongoDB, Redis, ElastiCache, DynamoDB, and H2 for robust and scalable data management solutions.
API Integration & Third-Party Services
Experience integrating Payment Gateways (Adyen, PayPal, Stripe), SendGrid, Swagger/OpenAPI, Zapier, Discord, LinkedIn, SMTP, and other third-party APIs.
AI & Agentic Engineering
Practical knowledge of AI tools including OpenAI (Codex, ChatGPT), Claude (Code, Cowork), Google Gemini, and Nano Banana 2 to reduce time-to-market and enhance engineering workflows.
Algorithmic Trading & Blockchain
Development of FOREX expert advisors for MetaTrader/cTrader, ZeroMQ bridges linking MQL trading logic with Python ML pipelines, and Ethereum blockchain services using Kotlin and Kafka Streams for ML-ready feature pipelines.
Expertise in building high-concurrency backend systems using Java (Spring Boot, Security, Cloud, Data, WebFlux), Go, and Python. Proficiency in RESTful APIs, SOAP, Microservices Architecture, JUnit, Mockito, Testcontainers, Maven, and Gradle.
Cloud Engineering (AWS & DigitalOcean)
Deep knowledge of AWS services including EC2, S3, IAM, RDS, Lambda, CloudWatch, VPC, ECS, Fargate, EKS, ElastiCache, and DynamoDB, as well as DigitalOcean. Architecting and optimizing cloud-native ecosystems for maximum performance and cost-efficiency.
DevOps & CI/CD Pipelines
Strong background in DevOps practices using Linux, Docker, Kubernetes (Helm), Terraform, and CI/CD tools such as GitHub Actions, GitLab, Jenkins, and Drone CI. Designing automated pipelines that accelerate release cycles and ensure resilient, high-quality deployments.
Distributed Systems & Messaging
Hands-on experience with Kafka, RabbitMQ, Pulsar, ZeroMQ, WebSockets (STOMP), Amazon SQS, and SNS for building scalable, high-throughput distributed architectures.
Data Persistence & Databases
Proficiency with PostgreSQL, MySQL, Amazon Aurora, MongoDB, Redis, ElastiCache, DynamoDB, and H2 for robust and scalable data management solutions.
API Integration & Third-Party Services
Experience integrating Payment Gateways (Adyen, PayPal, Stripe), SendGrid, Swagger/OpenAPI, Zapier, Discord, LinkedIn, SMTP, and other third-party APIs.
AI & Agentic Engineering
Practical knowledge of AI tools including OpenAI (Codex, ChatGPT), Claude (Code, Cowork), Google Gemini, and Nano Banana 2 to reduce time-to-market and enhance engineering workflows.
Algorithmic Trading & Blockchain
Development of FOREX expert advisors for MetaTrader/cTrader, ZeroMQ bridges linking MQL trading logic with Python ML pipelines, and Ethereum blockchain services using Kotlin and Kafka Streams for ML-ready feature pipelines.
Experience
Professional experience10+ years
Freelancer since2014
Languages
EnglishFluent
Project history
Architected and implemented scalable, cloud-native backend services reducing customer infrastructure costs by more than 35%. Managing and mentoring 20+ engineers, ensuring technical execution and DevOps practices align with core business goals. Engineered a secure Java-based ERP deployed via VPC on DigitalOcean. Leveraged AI tools and agents to reduce time-to-market by more than 60% while maintaining 99.9% system availability.
Led the team to architect RESTful APIs and optimized PostgreSQL for high-performance data retrieval and transactional integrity. Leveraged Pulsar's multi-tenancy features for high-throughput asynchronous data streams. Orchestrated a self-healing microservices ecosystem on Kubernetes with Drone CI pipelines.
Crafted a robust Spring Boot backend platform encompassing RESTful APIs, data persistence layers, and security modules. Integrated Stripe for payments, SendGrid for email, and Zapier for workflow automation. Created and optimized CI/CD pipelines with Jenkins and Docker for automated testing and containerized deployments.