Matvey Sizov ============ https://jorqen.link | oxoxevi351@gmail.com | https://linkedin.com/in/jorqen | https://github.com/jorqen | https://t.me/jorqen Backend engineer with 4+ years building production systems | vehicle telemetry, service mesh infrastructure, low-latency services and secure APIs | >70K RPS, p99 <50 ms Professional Profile -------------------- Backend Software Engineer focused on distributed systems, production infrastructure, and complex backend logic. I have 4+ years of commercial experience across electric-vehicle telemetry, service mesh, retail pricing, crypto payments, utility billing, and public digital services. I currently write mostly Go, have Java backend experience, and actively use Python in personal projects. I own backend work end to end: clarify ambiguous requirements, choose architecture through trade-offs, implement core services, add tests/observability/security, and ship through CI/CD. Professional Experience ----------------------- ATOM | Senior Software Engineer (Remote, Feb 2025 - Present, 1 yr 3 mos) Company site: https://atom.auto ATOM develops an electric-vehicle platform. In the communications and telemetry team, I build production backend services that keep vehicles securely connected to the cloud, integrate external clients, and support low-latency MQTT, gRPC, and API flows. - Independently drove requirements discovery for ambiguous and partially unrealistic low-latency vehicle-to-cloud communication: aligned with analysts, architects, and integration teams, identified feasible trade-offs, and brought the MVP scope to a state that could be documented in Confluence and used for development. - Influenced the final architecture by simplifying an over-split microservice concept into a cleaner broker-centered design. - Designed and co-developed an mTLS-secured MQTT broker based on Mochi MQTT, with Redis-backed session/state recovery for persistent vehicle-to-cloud communication and restart-safe operation. - Built a high-load backend service that currently handles 70K+ requests per second with p99 latency below 50 ms and is designed to scale beyond current load. - Built production observability from scratch: metrics, logs, traces, dashboards, alerts, latency/throughput monitoring. - After the team lost dedicated DevOps support, independently took over CI/CD and deployment setup: build pipelines, manifests/charts, and delivery automation. - Hardened trusted connectivity with certificate-based mTLS client authentication and topic-level authorization. Stack: Go, MQTT, Mochi MQTT, Redis, PostgreSQL, Apache Kafka, gRPC, REST API, HTTP/HTTPS, TLS/SSL, mTLS, Prometheus, Grafana, Loki, Sentry, Docker, Helm, Kubernetes, CI/CD, Build pipelines Lukyanov Tech | Part-Time Mentor / Mock Interviewer (Remote, May 2024 - Present, 2 yrs) Company site: https://lukyanov.tech Part-time mentorship project for backend engineers preparing for technical interviews. I run practical preparation tracks and mock interviews focused on backend fundamentals, system design, technical communication, and structured feedback. - Run backend mock interviews and mentor candidates on system design, backend fundamentals, technical communication, and answer structure. - Turn interview feedback into concrete practice plans and improve preparation materials and processes so candidates can close weak signals faster. Stack: Mentoring, Mock interviews, System design, Technical communication Sber Tech | Software Engineer (Moscow, Russia, Jan 2024 - Feb 2025, 1 yr 1 mo) Company site: https://sbertech.ru Sber Tech develops Platform V, a large enterprise platform. In the Service Mesh & Platform Infrastructure team, I worked on a heavily customized Istio fork and adjacent Kubernetes components for workload control, policy enforcement, and platform integration. - Restored the automated test suite in a heavily customized Istio fork, returned unit tests to daily development, and raised coverage to 80%. - Designed and built a Go integration-testing framework that provisioned isolated Kubernetes environments, ran suites in parallel, and generated Allure reports in CI. - Repaired CI/CD pipelines and moved defect detection earlier in the development cycle for infrastructure changes. - Expanded integration tests to ~95% of critical functionality, moving defect detection before release instead of relying on later manual checks. - Mentored ~10 School 21 interns on the framework and automation process, turning manual QA scenarios into scalable automated tests. - Designed and implemented a custom Kubernetes resource for managing Istio control-plane/data-plane relationships; the solution was later presented internally as a target platform approach. Stack: Go, Kubernetes, Istio, Service Mesh, gRPC, REST API, HTTP, PostgreSQL, CI/CD, Build pipelines, GitLab, Allure Magnus Tech | Software Engineer (Remote, Mar 2023 - Jan 2024, 10 mos) Company site: https://magnustech.com Magnus Tech is a custom software development company. I worked on a pricing-control platform for the Bristol retail chain that unified store data, employee actions, ML pricing recommendations, and photo confirmations into one workflow for operations teams. - Designed and developed Go backend services from scratch, connecting store data, product catalog data, ML recommendations, and employee actions into a unified pricing-control flow. - Built REST APIs for admin and internal tools used to review prices, apply manual overrides, compare stores, inspect photo evidence, and coordinate corrective actions. - Integrated web, email, SMS, and mobile notification flows and kept API contracts stable for frontend and mobile teams. - Covered critical pricing-control flows with backend automated tests around price updates, manual overrides, and data-processing paths. - Added Prometheus metrics and observability for critical flows and participated in the production launch after active development. Stack: Go, PostgreSQL, Redis, Apache Kafka, MinIO, REST API, gRPC, Prometheus, CI/CD, Clean Architecture Exnode | Backend Engineer (Moscow, Russia, Jun 2022 - Mar 2023, 9 mos) Company site: https://exnode.ru Exnode develops crypto exchange, B2B payment, and P2P trading products. I worked as part of a larger backend team on transaction flows where payments, exchange operations, and reporting had to stay consistent and fast under real business load. - Split a large monolithic backend into focused services and migrated part of internal communication from REST to gRPC, reducing latency and clarifying service boundaries. - Optimized payment and reporting queries using EXPLAIN ANALYZE, cutting several heavy PostgreSQL queries from 10-30 seconds to near real time. - Implemented a link-based payment service: created API flows that generated and stored payment links, integrated with the frontend payment form, and supported crypto/card payment scenarios. - Built core P2P exchange capabilities, including exchange-rate logic, service integrations, email notifications, and Telegram alerts. - Investigated and contained a critical currency-conversion incident, rolled back affected transactions, and then strengthened validation, observability, and release discipline to reduce recurrence risk. Stack: Go, PostgreSQL, Redis, RabbitMQ, REST API, HTTP, gRPC, Grafana, Telegram Bot API Kaluga Power Supply Company | Backend Engineer (Go) (Remote, Dec 2021 - Jun 2022, 6 mos) Company site: https://kskkaluga.ru Customer portal and internal administrative system for personal accounts, utility billing, payments, and property-management operations. - Under a team lead's technical guidance, independently developed the Go backend codebase for a customer portal and administrative system with integrations to 1C, payments, dashboards, and web/mobile clients. - Rewrote a key PHP service in Go, preserving critical 1C integration and payment-processing behavior while moving it to a more maintainable backend. - Delivered account, billing, payment, dashboard, and operational views for customers and property-management workflows. Stack: Go, PHP, PostgreSQL, 1C integrations, Payments, Dashboards Center for Regional Management of Lipetsk Oblast (CUR) | Java Developer (Lipetsk, Russia, Aug 2021 - Dec 2021, 4 mos) Public-sector digital services, including self-employment registration workflows and emergency-call analytics with map-based views and generated incident details. - Contributed to Java backend services for public-sector products, including self-employment registration and emergency-call tracking/analytics. - Implemented SQL-backed business logic for public-sector workflows and operational reporting. Stack: Java, SQL, Backend Education --------- Voronezh State Technical University | B.S. in Intelligent Automated Systems (part-time) (2025 - Expected graduation: 2030) University site: https://cchgeu.ru/ Voronezh State Technical University | Vocational diploma in Information Technology and Programming (2021 - 2025) University site: https://cchgeu.ru/ Technical Skills ---------------- Languages: Go (Golang), Java (6 months backend), Python (personal projects), SQL APIs & Messaging: gRPC, REST API, HTTP/HTTPS, MQTT, Apache Kafka, RabbitMQ, NATS Data & Storage: PostgreSQL, Redis, MinIO, ClickHouse, MongoDB Platform & Delivery: Docker, Kubernetes, Helm, Istio, Service Mesh, Infrastructure as Code, Ansible, GitLab, CI/CD, Build pipelines, Linux, Git Security & Identity: mTLS, TLS/SSL, Certificate-based authentication, Identity management, Keycloak, Active Directory Observability & Quality: Prometheus, Grafana, Loki, Sentry, Allure, Unit/integration testing Core areas: Distributed systems, Backend architecture, Clean Architecture, High-load and low-latency services, Service Mesh, Testing infrastructure, Observability, Service reliability, Production delivery, Fast technology ramp-up, AI-assisted development, Mentoring Spoken languages: Russian (Native), English (B2 / Working proficiency)