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Sergei Morozov

@sergeimorozov

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Senior backend engineer specializing in Python and Go, building observability solutions and backend systems.

Portugal

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What I'm looking for

I want to develop backend features and architectural solutions while building observability and monitoring using Python/Go, Docker, Kubernetes, and OpenTelemetry. I’m at my best owning system design and shipping internal tools that teams can rely on.

I’m a senior backend engineer experienced with Python and Go, currently working as an Observability Developer in Porto, Portugal. I build internal observability tools focused on visibility, reliability, and actionable telemetry.

In my current role at Five9, I develop new features and architectural solutions, building tools with Django and OpenTelemetry. I also work with core observability technologies like Loki and Grafana to support monitoring and troubleshooting.

Previously at REVOLUT, I worked for two years on systems for analyzing data in a data lake using Prometheus and Redis, supporting periodic sampling by fincrime analysts through a web UI workflow. I also maintained internal statistical systems using Python and Trino, and developed internal tools in Java.

Earlier roles include building backend services and microservices across cloud environments—auth services, billing-related APIs, and performance optimizations—using Python, Go, and Java. I’ve also developed systems in PHP, worked with financial crypto platforms in Python/Go, and supported security-focused malware analysis pipelines with job queues and virtualization tooling.

Experience

Work history, roles, and key accomplishments

Current

Observability Developer

Current

Five9

Jun 2025 - Present (1 year 1 month)

Developed internal observability tools built with Django and OpenTelemetry, including migrating functionality from an older Java solution. Worked on new features and architectural solutions for the observability platform.

Python Go Django Celery PostgreSQL MySQL TypeScript React Java OpenTelemetry Docker Linux Loki Grafana

Software Engineer

Revolut

Jun 2022 - Aug 2024 (2 years 2 months)

Built an analytics/QA system over a data lake for financial crime workflows using Prometheus and Redis-based statistical methods. Developed and maintained internal statistical tooling in Python/Trino and built internal tools in Java, supporting periodic sampling and task creation for analysts.

Python Trino SQLAlchemy Flask fastAPI Pandas PostgreSQL Java AWS GCP Kubernetes

Programmer

Dec 2021 - Jun 2022 (6 months)

Developed backend functionality for a monolithic PHP social network with an integrated messaging platform used via web UI and mobile apps. Worked on the messenger backend and researched related technologies and competitor products.

PHP C#

Software Engineer

Coins.ph

Aug 2020 - May 2021 (9 months)

Worked on a financial platform and mobile wallet integrating cryptocurrencies, including cash-in/cash-out and centralized asset management. Developed and maintained microservices in Python and Go and implemented a service for regular Bitcoin wallet optimization.

Python Django Flask Go PostgreSQL Bitcoin Ethereum AWS Docker Kubernetes Helm Prometheus Grafana

Experience Developer

Yandex

Aug 2017 - Dec 2019 (2 years 4 months)

Developed services for Yandex Cloud, including authentication/authorization components within an RBAC IAM framework. Built cryptographic key checking services and optimized performance to achieve 100k+ RPS.

Python Flask Go Java gRPC

Research Developer

Kaspersky Lab

Jul 2014 - Dec 2016 (2 years 5 months)

Developed a malware-sample analysis platform that runs analysis using Windows virtual machines and microservices for processing stages. Implemented internal processing workflows, maintained legacy services, integrated with virtualization tooling, and performed Linux administration for bare-metal deployments.

Python Perl Shell C#PostgreSQL QEMU Celery