Oleg Gavrilov

Senior Software Engineer

Cynna·May 2024 – Jul 2026

Senior backend development with a strong focus on development solutions system architecture, robust integrations, and database performance.

Key responsibilities

• Backend Development & Integrations: Developing complex backend business logic (PHP). Building and maintaining robust integrations with numerous external payment gateways and third-party APIs from scratch, ensuring secure data flow between internal microservices.
• API Engineering: Writing and structuring deep, highly scalable RESTful APIs and implementing real-time communication modules via WebSockets.
• Database Optimization (PostgreSQL): Architecting database schemas and managing complex data transactions. Routinely optimizing system performance through advanced SQL query optimization and strategic indexing.

Key achievements

• Architected an Event-Driven System: Spearheaded a phased, high-stakes migration of critical business processes to an event-driven paradigm. Implemented RabbitMQ from scratch, engineering a highly reliable message delivery system utilizing Dead Letter Queues (DLQ) and distributed Redis mutexes to eliminate race conditions.
• Developed a Fault-Tolerant Multi-Domain Auth System: Engineered a complex internal authentication infrastructure (PHP, JS). Eliminated single points of failure by leveraging Redis as an event bus to create a self-healing mechanism, allowing sessions to automatically regenerate even during complete authorization server outages.

Tech stack

Senior Software Engineer

Relsa·Apr 2023 – May 2024

Developing high-throughput backend services, complex data pipelines, and real-time analytics infrastructure for a mobile app marketing platform.

Key responsibilities

• Backend Development (Golang & PHP): Writing and maintaining microservices and robust business logic to support marketing campaigns and ad network interactions.
• Ad Network Integrations: Developing complex, seamless API integrations from scratch with major mobile advertising platforms (AdMob, Unity Ads, AppLovin, ironSource) to aggregate campaign data and automate bidding processes.
• Durable Execution & Workflows (Temporal): Engineering fault-tolerant, long-running business processes. Leveraging Temporal to orchestrate stateful, event-driven workflows that guarantee execution even during external ad-network outages or system restarts.
• Analytics Processing: Building data pipelines to process and aggregate massive volumes of marketing statistics (impressions, clicks, conversions) using ClickHouse for real-time analytics and reporting.
• Database Engineering: Managing transactional data utilizing PostgreSQL. Structuring schemas, optimizing heavy queries, and ensuring data consistency across distributed services.

Key achievements

• Implemented Bulletproof Ad Workflows with Temporal: Designed and developed durable business processes for syncing ad campaigns across multiple networks. This eliminated manual interventions, data loss, and race conditions during external API failures, ensuring 100% workflow completion.
• Unified Multi-Platform Ad Integrations: Architected and coded a unified, event-driven integration layer that standardized data flows between internal systems and diverse external platforms (Unity Ads, AppLovin, etc.), significantly reducing time-to-market for adding new ad partners.

Tech stack

PHP/Go Team Lead

Affmy·Jun 2022 – Aug 2023

Led a cross-functional backend engineering team, bridging the gap between hands-on technical architecture and team management. Focused on establishing a scalable unified infrastructure and optimizing engineering processes.

Key responsibilities

• Team Leadership & Management: Managed the full engineering lifecycle — interviewing, hiring, onboarding, and offboarding. Fostered team growth and motivation by implementing structured Individual Development Plans (IDP) and performance review systems.
• Engineering Processes: Reorganized and streamlined development workflows, improving overall team velocity and delivery predictability.
• Architecture & Code Quality: Designed system architectures for new services, conducted rigorous code reviews, and maintained high engineering standards across PHP and Golang codebases.
• API & Integration Development: Developed and supported comprehensive APIs, establishing a reliable integration environment for seamless interaction between internal microservices.

Key achievements

• Architected a Unified Core Infrastructure: Designed and implemented a foundational core framework utilized for all subsequent internal services. This heavily reduced boilerplate code and unified the company’s backend infrastructure.
• Developed Specialized Traffic Delivery Systems (TDS): Led the end-to-end development of two distinct TDS engines (tailored for different business purposes), alongside a unified frontend control panel to centralize traffic management.
• Spearheaded Containerization & DevOps Transformation: Migrated legacy environments to a fully containerized architecture. Successfully integrated Docker and Docker Swarm, drastically optimizing both the local development experience and production deployment cycles.

Tech stack

Head of Development

Otto Group·Jun 2021 – Jan 2022

A strategic leadership role overseeing the entire software development department. Focused on aligning engineering execution with e-commerce business goals, managing multiple cross-functional teams, and optimizing delivery processes.

Key responsibilities

• Department Leadership: Directed and scaled multiple engineering teams, overseeing resource allocation, budgeting, and capacity planning for the department.
• Delivery Management: Orchestrated the Software Development Life Cycle (SDLC) across multiple parallel streams. Ensured predictable, high-quality delivery of critical e-commerce systems and internal platforms.
• Stakeholder Communication: Acted as the primary bridge between the engineering department and C-level/business stakeholders. Translated complex business requirements into clear technical roadmaps.
• Process Engineering: Implemented and standardized Agile methodologies and engineering best practices across all teams to improve cross-team collaboration and efficiency.

Key achievements

• Scaled & Restructured Engineering Teams: Successfully built and managed a structure of multiple autonomous, cross-functional teams, establishing clear KPIs, communication channels, and areas of responsibility.
• Streamlined Project Delivery: Rebuilt departmental workflows to eliminate bottlenecks between development, QA, and business units, significantly improving time-to-market for key e-commerce initiatives.

Development Team Lead

Data3 Consulting·Apr 2020 – Jun 2021

Orchestrated distributed engineering and QA teams, focusing on architectural design, infrastructure containerization, and establishing robust testing and deployment pipelines.

Key responsibilities

• Team Management & Operations: Managed a cross-functional department of up to 15 developers and QA engineers (including in-house, remote, and contractors). Successfully established highly efficient remote workflows and communication protocols.
• Architecture & Code Quality: Led the architectural design of core services, conducted rigorous code reviews, and maintained technical standards across the engineering department.
• API Design & Integration: Directed the design and development of comprehensive APIs, enabling seamless communication between the core system and ~17 peripheral enterprise services (CRMs, ERPs, etc.).
• Quality Assurance Strategy: Managed the QA team and formulated a multi-tiered testing strategy encompassing manual feature testing, pre-release checks, and automated post-release verification.

Key achievements

• Spearheaded Infrastructure Dockerization: Completely containerized the legacy project infrastructure. Created unified, reproducible environments across local development, staging, and production, drastically reducing "works on my machine" issues.
• Optimized CI/CD & Delivery Workflows: Successfully implemented and enforced a strict Gitflow branching strategy. Revamped CI/CD pipelines and integrated automated unit testing into the deployment lifecycle, significantly improving release stability.
• Architected a Massive Integration Layer: Designed and delivered a robust API ecosystem capable of handling complex data exchanges with over 17 external services, maintaining high data consistency and performance.

Tech stack

Application Development Team Lead

Enjoylab·Aug 2017 – Apr 2020

Led the engineering and architecture of the company’s internal automation ecosystem while building, scaling, and managing multi-disciplinary development teams.

Key responsibilities

• System Architecture & API Design: Architecting a modular internal automation system (CRM, Task Management, Knowledge Base) and designing public-facing APIs for satellite website integrations.
• Team Leadership & Operations: Coordinating several development streams (up to 12 engineers), establishing the software development lifecycle (SDLC), and setting up the internal engineering infrastructure.
• Vendor & Remote Management: Overseeing long-term relationships with external contractors and remote developers, establishing clear communication protocols and delivery standards.
• Full-Stack Development: Writing clean, maintainable code across the backend (PHP/Laravel, Python) and supporting frontend/mobile initiatives in React and React Native.

Key achievements

• Built an Engineering Department from Scratch: Successfully interviewed, hired, and onboarded a 12-person team from the ground up, designing the department’s internal business processes and workflow from day one.
• Architected an All-in-One Enterprise Platform: Designed the core architecture for the company’s primary internal automation ecosystem, consolidating CRM, task tracking, and operations into a single modular solution.
• Engineered a Custom POS Hardware Integration: Developed a stable software layer to integrate physical cash registers and fiscal recorders directly with the company’s web interface, automating on-site point-of-sale transactions.

Tech stack

Development Team Lead

Russian Food House·Apr 2016 – Jul 2017

Key responsibilities

• Managing a team of developers (2 teams of 2–4 backend developers, 1 frontend developer, and 1 tester).
• Designing the application architecture and system modules.
• Defining technical requirements for development and the project’s technology stack.