Senior tech lead / principal backend engineer

SMARTCORE AG; A distancia; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A fintech holding company is seeking an experienced engineer to lead the design of a core anti-fraud system. You will be responsible for defining the technical architecture, building data-processing pipelines, and optimizing analytics for millions of transactions. The ideal candidate will have over 10 years of experience, specifically in distributed systems, and must be fluent in Russian. This is a fully remote position with competitive compensation and flexible schedules.

Servicios

Competitive compensation

Fully remote work

Flexible schedule

Access to cutting-edge LLMs

Personal learning budget

Formación

• 10+ years of commercial experience, including 3+ years as a Tech Lead / Architect.
• Deep knowledge of any strongly typed language and willingness to write in TypeScript / Node.js.
• Professional command of distributed-systems patterns.

Responsabilidades

• Lead the development of the core anti-fraud system.
• Design a risk-scoring engine with low latency.
• Build an event-driven architecture resilient to failures.
• Define the technical vision and architecture of the platform.

Conocimientos

Node.js

Java

Go

C#

Rust

Python

C++

Fluent Russian (B2 or higher)

Herramientas

Kafka

PostgreSQL

ClickHouse

Flink

NestJS

Descripción del empleo

Product :

Anti-fraud System |

Stack :

Golang, Node.js, TypeScript, ClickHouse, Kafka, Tigergraph

Format :

Remote |

Employment :

Full-time |

Compensation :

starting from €8,000

SmartCore

is a fintech holding, building a mission-critical fintech platform. Our real-time system protects millions of transactions from fraud. We are looking for a

n engineer with a strong architectural background

— someone who understands that a programming language is just a tool.

If you possess mastery in

• Node.js
• Java
• Go
• C#
• Rust
• Python
• C++

, and have deep expertise in building complex systems, and are ready to apply your experience within a

Golang

Node.js

TypeScript

ecosystem, we should definitely talk!

Our Tech Stack (you will work with)

We expect you to adapt quickly and bring your own expertise :

Backend :

Node.js, TypeScript, NestJS, Go

Data :

PostgreSQL, ClickHouse, Redis, Tigergraph

Messaging / Streaming :

Kafka, RabbitMQ

Big Data :

Apache Flink

Your Challenges (Architecture & Engineering)

You will lead the development of the core of our anti-fraud system. The tasks are language-agnostic — they are rooted in Computer Science :

Real-time Scoring Engine

Design a risk-scoring engine with p99 latency in the tens of milliseconds (device fingerprinting, behavioral analytics).

Distributed Systems Design

Build an idempotent, event-driven architecture resilient to entire data-center failures.

High-Performance Analytics

Optimize data storage and access (millions of transactions) for analytics and ML models.

Data Consistency

Implement complex profile-merging logic (Customer 360) and manage distributed transactions (Saga, TCC).

What You Will Work On

Define the technical vision and architecture of the platform (we primarily use Node.js / NestJS, but expect you to bring best practices from Java / Go / Enterprise environments).

Design data schemas for PostgreSQL and ClickHouse under extreme load.

Build reliable data-processing pipelines (Kafka, Flink).

Mentor the team : teaching engineers to think in terms of algorithmic complexity, memory, and concurrency — not just business logic.

Act as an evangelist for AI-powered development (we actively use LLMs and Cursor).

Ideal Candidate Profile

Engineering DNA

10+ years of commercial experience, including 3+ years as a Tech Lead / Architect.

Language-Agnostic Mindset

Deep knowledge of any strongly typed language (Java, Go, C#, Rust, etc.) and willingness to write in TypeScript / Node.js.

System Design Mastery

Professional command of distributed-systems patterns. Experience with message brokers (Kafka / RabbitMQ) at the delivery-guarantee level.

AI-Native Mindset (Critical)

You use LLMs not as a toy but as a productivity multiplier (boilerplate generation, refactoring, tests, data analysis). Experience with Cursor IDE or similar tools.

Must have (Critical)

• Fluent in Russian (B2 or higher) — required for daily communication within the team.

Nice to Have

• Experience with Node.js (even minimal)
• Experience with anti-fraud systems, billing, or high-frequency trading
• Experience with streaming systems (Flink, Spark Streaming)

We Offer

• Competitive compensation (defined individually; aligned with Senior / Principal level)
• Fully remote work with a flexible schedule
• Ability to bring best practices from your core stack into our platform
• No legacy and no bureaucracy
• Corporate access to cutting-edge LLMs and personal learning budget

Feel free to apply directly via LinkedIn or by sending your CV to stanislav.pavlov(@)smartcore.pro — if you’re ready for architectural challenges and want to build a product you can be proud of!