You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Malt Strategy
Tatsiana L.TL

Tatsiana L.

Senior Backend Architect & API Systems Engineer

€360/day
Madrid, ES
15+ years
GraphQL
Node.js
Rust
PostgreSQL
Typescript

Average response time: 1 hour

About Tatsiana

I design backend systems that remain secure, stable, scalable, and maintainable as products grow.

With a Master’s degree in Computer Science and 15+ years of engineering experience, I specialize in architecture and implementation of high-performance backend platforms serving real production workloads.

Companies typically involve me when:

✅ a product backend must be designed correctly from day one
✅ multiple clients rely on one API (web, mobile, integrations)
✅ performance or scalability becomes a business risk
✅ systems grow complex and development slows down
✅ legacy backend requires careful refactoring without downtime

I combine architectural thinking with hands-on development, taking systems from early design through production deployment.

📍Core Backend & Architecture Expertise:
• Backend architecture & service design
• High-performance systems (Rust, Node.js)
• GraphQL & REST API architecture
• PostgreSQL data modeling & optimization
• Distributed & real-time systems
• Microservices & integrations
• Cloud infrastructure & DevOps workflows

Experience also includes distributed systems, blockchain infrastructure, and latency-sensitive platforms, including algorithmic trading bots & high-frequency trading systems.

📍Technologies:
• Languages: JavaScript, TypeScript, Rust, PHP, Solidity
• Backend: Node.js, Express.js, GraphQL, MERN, PERN, LAMP
• Databases: PostgreSQL, MySQL, MongoDB
• Cloud: AWS, DigitalOcean, Apache, Nginx, Render, Vercel, Cloudflare
• DevOps: Docker, CI/CD, Git workflows
• Integrations: Stripe, PayPal, OAuth, WebRTC, WebSockets, Custom APIs, Redis
• Blockchain: Web3, Smart Contracts, EVM ecosystems
• ML/AI: OpenAI, Lyzr, Base44

I work best with clients, startups and teams who value engineering quality, clean architecture, strong ownership, long-term maintainability, and clear communication.
Digital and IT Services
E-commerce
Software Publishing
Social Networks
Banking and Financial Services

  • English

    Native or bilingual

  • Spanish

    Fluent

  • French

    Basic

  • German

    Basic

Remote only
Primarily works remotely

Experience

  • Cenebro
    Principal Engineer
    BANKING AND INSURANCE
    November 2025 - Today (7 months)
    Zürich, Switzerland
    Owned architecture and technical direction for distributed financial systems and high-load backend platforms. Designed scalable Rust and Node.js services, APIs, and microservices handling real production traffic. Improved system performance, reliability, and security, introduced clean architecture standards, optimized databases, implemented cloud deployments, and mentored engineering teams while delivering business-critical software solutions end-to-end.
    Rust IT Architecture Software Architecture Node.js GraphQL
  • CryptoMoto Ltd
    Chief Technology Officer
    AUTOMOBILE
    September 2022 - Today (3 years and 9 months)
    England, United Kingdom
    Defined company technical vision and architecture strategy. Designed and implemented backend infrastructure for a decentralized social platform serving multiple production clients. Built scalable APIs, integrated Web3 infrastructure, established engineering processes, ensured system reliability and security, and led development from early concept through full production deployment and platform scaling.
    Node.js IT Architecture GraphQL PostgreSQL External API integration
  • Fluid Finance SA
    Head of Web Development
    BANKING AND INSURANCE
    September 2021 - August 2022 (11 months)
    Geneva, Switzerland
    Led fintech engineering organization responsible for secure financial platforms and high-availability backend services. Architected scalable financial APIs and cloud infrastructure, introduced engineering standards and DevOps practices, improved delivery velocity, and increased platform reliability. Successfully scaled systems to handle high transaction volumes while maintaining low latency, security compliance, and fault-tolerant operations.
    External API integration API REST Database Management (e.g., SQL, NoSQL) Cloud Platforms and Infrastructure IT Architecture
Check out Tatsiana's experience

Recommendations

Be the first to recommend Tatsiana

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Signup to reveal

Education

  • Master's degree
    Belarusian State University of Informatics and Radioelectronics
    2011
    Computer Science & Software Technology
  • Master's degree
    Belarusian State University
    2007
    International Relations and Affairs

Skill set

Backend Service Development
CMS Customization
External API integration
Front End Interface Development
Software Architecture
Performance Optimization
CI/CD Management
Cloud Administration
Cloud Integration
Containerization and Virtualization
Microservices Architecture
Serverless Computing
Algorithms and Data Structures
Cloud Platforms and Infrastructure
Database Management (e.g., SQL, NoSQL)
Data Cleaning and Preprocessing
Data Migration and Backup
Web scraping
ERP Integration with External Systems
Embedded software
ERP System Customization
IT Architecture
System Integration
REST
API REST
PHP
phpMyAdmin
Solidity
Next.js
Express
MERN
PERN
LAMP
MySQL
MongoDB
AWS
DigitalOcean
Apache
Nginx
Render
Vercel
Cloudflare
Docker
CI/CD
Git

Categories