Konstantin Naumov - CV

Staff Backend Engineer | Go/Distributed Systems

📧 naumov.k@gmail.com | 🔗 linkedin.com/in/k0nsta-naumov | 💬 @elk0sta (TG) | 📍 Portugal

Professional Summary

Backend Engineering Lead specializing in distributed systems, microservices architecture, and high-throughput data processing. 8+ years building production systems in Go and Python, with expertise in Kafka, PostgreSQL, Kubernetes, and cloud-native architectures. Track record of architecting systems handling 3K+ RPS, leading cross-functional teams, and driving technical decisions at architectural committee level.

Technical Skills

Languages: Go (expert), Python (proficient) | Databases: PostgreSQL, Redis, MongoDB, ClickHouse, Elasticsearch
Infrastructure: Kubernetes, Docker, AWS (EKS, RDS, S3, EC2), GitLab CI | Messaging: Kafka, gRPC, AMQP, REST
Observability: Prometheus, Grafana, Datadog, Jaeger, Sentry, Kibana, k6 | Architecture: Microservices, Event-driven, Distributed systems

Professional Experience

Holland & Barrett | Lead Backend Engineer

September 2023 - Present (1+ years) | Portugal (Remote)

Leading backend engineering for Europe’s largest health & wellness retailer’s digital transformation, building the Product Information Management (PIM) platform powering their online marketplace across UK and Benelux regions (30K+ SKUs, 180+ RPS).

• Architected robust product publishing system with comprehensive data validation, eliminating critical architectural flaws including cross-layer logic contamination and inheritance loops
• Led modernization of PIM services and orchestrated Product API migration from C# to Go, establishing it as the single source of truth for product data (excluding pricing/inventory)
• Optimized infrastructure costs and improved API performance through Kubernetes resource tuning and database optimization
• Drove cross-functional collaboration and requirements ownership by proactively engaging with product managers, business stakeholders, and adjacent teams to clarify attribute purposes, validate usage patterns, challenge flawed assumptions, and align technical decisions with business objectives, reducing rework and implementation errors
• Redesigned publishing mechanism with clear validation rules, significantly reducing support tickets and improving merchandise team experience
• Established engineering excellence practices including comprehensive code review standards and shared architectural patterns that reduced bug rate
• Restructured team during organizational transformation, maintaining delivery velocity while downsizing from 3 to 1 backend engineer

Technologies: Go, Python, PostgreSQL, Kafka, AWS, Kubernetes, Prometheus, Datadog

SberMarket | Golang Backend Engineer

January 2021 - September 2023 (2 years 9 months) | Moscow, Russia (Remote)

Delivered mission-critical microservices for Russia’s largest online grocery marketplace serving 360+ cities, 8M+ products across 230+ grocery chains, 3,360+ retail partners, and 39K+ restaurants.

• Stock Hub Service: Architected from scratch high-throughput distributed system handling 3K+ RPS (gRPC), processing millions of Kafka events, aggregating real-time inventory data, pricing, and ML-based availability predictions for analytics, storefronts, and mobile apps. Designed sharding strategy for horizontal scalability.
• Payroll Service: Architected integration with Russian Federal Tax Service (FTS), automating income calculation, tax computation, and declaration submission for thousands of couriers/packers, eliminating manual processing and reducing financial department workload by 80%. Navigated complex legacy government systems (SOAP/XML) with minimal documentation.
• Stock Inventory Service: Led development of real-time availability checks in partner stores through packer mobile app
• Presented and defended architectural proposals at company-wide technical committee, driving adoption of scalable microservices patterns
• Led team of 2 backend engineers while continuing hands-on development of critical features

Technologies: Go, Python, PostgreSQL, Kafka, Elasticsearch, gRPC, Kubernetes, GitLab CI, Sentry, Redis

Telematics-One Group | Golang Developer / Project Lead

August 2020 - August 2021 (1 year 1 month) | Moscow, Russia

Led development of microservices platform for public transit management system processing real-time telemetry data from thousands of vehicles across multiple Russian cities (1-second telemetry intervals per vehicle).

• Led project team of 3-5 engineers, managing code reviews, prioritizing issues, and balancing business requirements with technical feasibility
• Developed high-throughput microservices for scheduling, forecasting, geo-matching, GTFS data processing, business intelligence, and telemetrics
• Established service communication patterns using AMQP and gRPC for distributed event processing

Technologies: Go, gRPC, AMQP, Kafka, PostgreSQL, MongoDB, ClickHouse, Kubernetes, Prometheus, Grafana, Jaeger

ООО “ВФМ Технолоджи” | Senior Go Developer (Contract)

November 2021 - March 2022 (5 months) | Moscow, Russia (Remote)

Designed microservices architecture for decoupling legacy monolith, implemented multiple services from scratch, and established patterns for REST APIs and event-driven communication. Tech: Go, PostgreSQL, Redis, Kafka, Kubernetes

Particle.One | Backend Developer / Team Lead (Contract)

June 2020 - May 2021 (1 year) | California, USA (Remote)

Designed and architected real-time data delivery system for SEC filings and financial market data. Managed team of 3-5 contractors, maintained production SaaS platform. Tech: Python 3.7 (asyncio), PostgreSQL, Docker, AWS

Earlier Experience

Particle.One | Backend Engineer | Jun 2018 - Dec 2019
Designed scalable distributed RESTful backend for stock trading sandbox platform. Integrated external APIs, managed databases, deployed microservices on AWS.

Telematics-One Group | Golang Developer (Contract) | Mar 2020 - May 2020
Developed high-load microservices for transport management platform using Go, gRPC, AMQP, PostgreSQL.

Education

State University — Higher School of Economics | Python Developer Professional Development (2016)
Russian Academy of Advocacy and Notaries | Master of Laws (LLM) (2000-2005)

Languages & Certifications

Languages: English (Full Professional), Russian (Native) | Certifications: System Analysis