Sergii

Sergii Panichev

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Professional Summary
Full-Stack Backend Engineer with 10+ years of software development experience,
transitioning focus from PHP to Node.js. Proven expertise in designing and
implementing scalable, maintainable backend systems and APIs across multiple
tech stacks. Strong foundation in object-oriented programming, SOLID principles,
microservices architecture, and cloud deployment. Currently leveraging 1+ years of
Node.js hands-on experience at Defentry AB to deepen expertise in modern
JavaScript ecosystems. Passionate about writing clean, well-tested code and
collaborating with cross-functional teams to deliver innovative solutions.

I’m familiar with AI integration within applications, including LLM APIs, tool calling,
OpenAI SDK, OpenRouter, and intelligent automation using Claude, OpenAI, and
similar platforms.

Technical skills
Backend Technologies
Node.js, JavaScript, TypeScript, PHP (Laravel, Symfony), Python, Java

Frontend & Web
React, Vue, React Native, HTML5, CSS3

Databases & Storage
MySQL, PostgreSQL, MongoDB, Redis

Messaging & Event-Driven Systems
RabbitMQ, Kafka, MQTT

Architecture & Cloud
Microservices, Distributed Systems, REST APIs, OAuth2, JWT, Google Cloud, AWS

Education
Sept 2000 - Jul 2005 National Aviation University
Master’s degree in computer science.

May 2014 - Dec 2014
Data structures and Algorithms.

Sept 2018 – Oct 2019
Java Advanced Programming course

Work experience
Sep 2020 - Aug 2026, Defentry AB, Software Engineer
Defentry is a proactive Cyber-Safety SaaS platform designed to protect digital
identities through real-time data breach monitoring and credential leakage
detection. The system scans the surface, deep, and dark web to identify
compromised personal data, providing automated alerts and remediation steps to
help users mitigate the risk of identity theft and account takeovers.
Tech Stack: PHP, NodeJs, RabbitMQ, MySQL, Google Cloud, Redis, React,
ReactNative, VueJs, OpenRouter

Dec 2017 – Jul 2020, KRY AB, Senior Software Engineer
KRY is a market-leading HealthTech platform that revolutionizes patient care
through digital-first primary healthcare services. The ecosystem connects millions
of patients with healthcare professionals via secure video consultations, integrated
electronic health records (EHR), and automated prescription management,
streamlining the entire medical journey from diagnosis to recovery.
Tech Stack: Java, PHP, PostgreSQL, Redis, AWS, MQTT, Kafka, React

Dec 2016 – Jul 2017, Onlyfans, Senior Software Engineer
Onlyfans is a global social content platform serving 100M+ users daily. I worked as
a Software Engineer and performed wide range of engineering tasks, such as: new
features development, testing, database optimization, etc.
Tech Stack: PHP, PostgreSQL, Redis, AWS, VueJs

May 2013 – Sep 2016, Ciklum LLC, Senior Software Engineer
Ciklum is a Danish world-wide outsourcing company. During that period I
participated in several projects of EU companies as a Senior Software Engineer and
as a Frontend developer.
There were as big companies with more than 300 employers and as small
companies.
I developed different kinds of projects (e-Commerce, financial, payment gateway,
API services for mobile applications, etc.).
Tech Stack: PHP (Symfony/Laravel), MySQL, PostgreSQL, Redis, AWS

Feb 2008 – Apr 2013, Eurolab LLC, Software Engineer.
A specialized Healthcare Information System (HIS) designed to manage the end-to-
end operations of a premium multidisciplinary clinic. The platform digitizes the
patient journey from initial booking and digital triaging to internal medical record
management and automated billing, ensuring a seamless flow of data between
patients, clinical staff, and administrative teams.
Tech Stack: PHP (Symfony/Laravel), MySQL, Redis

Languages
Ukrainian - Native
Russian - Native
English – Upper-Intermediate (B2)