Description

Need a high-performing backend or cloud infrastructure fixer who can drop in next Monday, untangle complex architectures, and ship clean code without the corporate overhead? I help fast-growing European scale-ups and enterprise platforms clear technical debt, accelerate feature velocity, and build bulletproof, high-throughput systems.

What sets me apart is a deep, proven track record of handling extreme scale at top-tier platforms like Vinted, MessageBird, and Coolblue. I bring unique, high-stakes domain expertise in Trust & Anti-Fraud networks and mission-critical automated billing infrastructure. Whether it’s optimizing a detection stack to dismantle sophisticated counterfeit operations or processing millions of real-time transactions per day with zero financial slippage, I build for absolute data integrity and system reliability. I am deeply pragmatic—focusing on long-term architectural health while actively preventing over-engineering. If a bottleneck requires me to rapidly adapt to a new language like Ruby, I dive in and execute.

My typical deliverables and projects include:

Go (Golang) Microservices Migrations: Transitioning legacy enterprise applications (including heavy PHP/Symfony/Laravel codebases) into cloud-native Go microservices with zero downtime.
Cloud Infrastructure & DevOps: Designing, scaling, and automating modern AWS or GCloud stacks, containerized workloads (Docker), and high-availability deployment pipelines.
Legacy Modernization & Core Architecture: Restructuring brittle backends, implementing core architectural routing components, and building scale-ready internationalization (i18n) structures.

I operate as an autonomous, high-execution B2B partner aligned with CET. You provide the technical milestones; I deliver the code and stable infrastructure. Let's build.

Industry field of expertise

Languages

Lithuanian
Native or bilingual
English
Native or bilingual

Workplace preferences

Can work on-site

Vilnius (up to 50km)

Vinted
Technical Lead / Systems Architect - Trust & Anti-Fraud
E-COMMERCE
December 2023 - August 2025 (1 year and 8 months)
Vilnius, Vilnius City Municipality, Lithuania
Led high-velocity technical execution and system architecture for the platform's core Trust and Anti-Fraud domain, driving the mitigation of counterfeit operations within a multi-billion euro e-commerce ecosystem.
Spearheaded and accelerated business-critical detection projects, outpacing standard team delivery cycles to secure a drastic, measurable reduction in platform counterfeit listings.
Directly embedded with the engineering team to optimize and scale a high-throughput fraud detection stack, rapidly mastering and utilizing Ruby to eliminate performance bottlenecks.
Focused on leveling up the technical autonomy and execution of the engineering team, enabling fast iteration, failure-proofing, and clean architectural patterns.
Tech Lead DevOps Ruby on Rails GO Distributed Architecture
MessageBird
Lead / Senior Backend & Infrastructure Engineer — Billing Platform
DIGITAL AND IT
September 2019 - December 2023 (4 years and 3 months)
Amsterdam, Netherlands
Engineered and scaled the core high-availability billing and invoicing systems responsible for processing millions of real-time transactions per day (SMS, WhatsApp, and omni-channel communication data) across a global cloud communications network.
Architected and maintained the mission-critical ingestion pipelines that processed millions of daily messaging events, ensuring 100% data consistency, financial accuracy, and zero-loss invoice generation.
Successfully executed a critical, zero-downtime architectural shift from legacy enterprise PHP systems to high-performance Go (Golang) microservices, testing and deploying the new infrastructure directly into a heavy-load production environment.
Directed a high-performing technical team of 7 engineers, focusing heavily on code quality, testing rigor, and infrastructure reliability to guarantee that invoicing pipelines operated flawlessly without financial slippage.
GO PHP Google cloud MySQL
Speakap
Senior Backend Engineer
SOCIAL NETWORKS
July 2018 - June 2019 (11 months)
Amsterdam Metropolitan Area, Netherlands
Served as a core senior contributor, focusing on feature velocity, technical debt reduction, and performance tuning for an established enterprise communication platform.
Navigated and optimized complex, legacy backend architectures, systematically refactoring brittle code to improve system maintainability and platform stability.
Independently developed, tested, and shipped critical new backend features, ensuring seamless integration with existing core services.
Identified and eliminated backend performance bottlenecks, directly improving application response times and resource efficiency under continuous user loads.
PHP Symfony Redis