05/23/2026 updated
100 % available
High-End Backend Architect / Full-Stack Developer / DevOPS
Rivne, Ukraine
Only remote
Technical collegeAbout me
High-End Backend Architect & Privacy Engineer with 25+ years designing secure, high-load B2B/SaaS infrastructures. Founder of Guardyn (E2EE) & GhostFlow. Expert in Rust, Kubernetes, post-quantum cryptography, and AI integrations for zero-knowledge, scalable systems.
RustFlutterJavaScriptAffiliate MarketingSoftware as a ServiceCloud EngineeringCryptographyPostgreSQLMongoDBSoftware ArchitectureNext.jsTraffic FlowTypeScriptRust (Programming Language)Docker Swarm
Backend Architect & Privacy Engineer & Full-Stack Developer & DevOPS | Founder @ Guardyn | 25+ Years Building Scalable Systems
I architect and build technology that respects user privacy - from secure communication platforms to high-performance web applications and distributed systems.
Currently leading Guardyn, an open-source E2EE messaging platform with zero metadata collection, built on Rust, Kubernetes, and proven cryptographic protocols (Signal Protocol, OpenMLS RFC 9420).
⚙️ Privacy & Security Engineering:
• End-to-end encryption implementations (X3DH, Double Ratchet, OpenMLS)
• Post-quantum cryptography (Kyber hybrid schemes)
• Zero-knowledge architecture design
• Security audit-ready infrastructure (reproducible builds with Nix)
⚙️ Backend Architecture & Distributed Systems:
• High-performance backends: Rust, Go, Node.js/NestJS
• Distributed databases: TiKV, ScyllaDB, PostgreSQL, MySQL
• Event streaming: NATS JetStream, Apache Airflow, Redis
• Microservices with gRPC and Protocol Buffers
• RESTful API design and implementation
⚙️ DevOps & Cloud Native:
• Kubernetes orchestration (production-grade deployments)
• Docker containerization and Swarm
• CI/CD pipelines with security signing
• Infrastructure as Code (Helm, Kustomize)
• Observability: Prometheus, Grafana, Loki, Tempo
⚙️ Full-Stack Development:
• Frontend: React, Next.js, TailwindCSS, Bootstrap
• Mobile: Flutter/Dart (in progress)
• Responsive UI/UX design
• Modern web standards (HTML5, CSS3)
⚙️ Data Engineering:
• Data orchestration with Apache Airflow
• Caching strategies with Redis
• Database optimization and schema design
• High-throughput data pipelines
⚙️ AI/ML Integration:
• LLM integration and prompt engineering
• Diffusion models for content generation
• AI agents and workflow automation
• Enhancing applications with ML capabilities
⚙️ Professional Experience:
25+ years delivering B2C, B2B SaaS, ERP, and CRM solutions. Proven track record in:
• Technical leadership and architecture decisions
• Mentoring engineering teams
• Cross-functional collaboration
• Agile project management
• Innovation and problem-solving
⚙️ Open Source: github.com/guardyn/guardyn
Passionate about building privacy-preserving technology, solving complex distributed systems challenges, and contributing to open-source security tools.
Open to collaborations in privacy-tech, cryptography, and cloud-native architecture.
Experience
Professional experience10+ years
Freelancer since2007
Languages
EnglishBasic knowledgeRussianNative speakerUkrainianNative speaker
Project history
Building Guardyn - an open-source, privacy-first secure communication platform with military-grade end-to-end encryption. ? Core Responsibilities: • Architecting distributed backend infrastructure (Rust, Kubernetes, TiKV, ScyllaDB, NATS) • Implementing cryptographic protocols (X3DH, Double Ratchet, OpenMLS RFC 9420) • Designing zero-metadata architecture for maximum privacy • Leading security-first development with reproducible builds (Nix) • Building production-ready E2EE messaging system from scratch ?️ Technical Stack: • Backend: Rust, gRPC, Protocol Buffers • Infrastructure: Kubernetes (k3d), Cilium CNI, Helm, Kustomize • Data Layer: TiKV (distributed KV store), ScyllaDB (high-throughput) • Messaging: NATS JetStream (event streaming) • Cryptography: Signal Protocol, OpenMLS (MLS RFC 9420), Kyber (post-quantum) • Observability: Prometheus, Loki, Tempo, Grafana • DevOps: Nix flakes (reproducible builds), SOPS + Age (secrets management) ? Key Achievements: • Deployed production-ready backend MVP with 8/8 integration tests passing • Implemented full E2EE stack (X3DH key exchange, Double Ratchet, OpenMLS groups) • Built Kubernetes-native architecture with auto-scaling and observability • Established reproducible build pipeline for security audits • Open-sourced entire codebase under Apache 2.0 license ? Project: github.com/guardyn/guardyn
Developed an autonomous module for the existing CRM/ERP system for business management and personnel interaction, taking into account the specifics of B2B/B2C. Expanded the basic functionality and connected an additional module for managing business processes for personnel, depending on the role and access for each user of the system. Created a mechanism to manage functionality, filtering, logging and logistics for each group of system users using a visual map (using Google Maps API + Radius). Developed a 100% highly efficient SQL project architecture with complex queries for the business and user management module. He was directly involved in the development of the business model of the enterprise with product owners.