# Savva User

Savva User is a remote worker on Himalayas, Lead Backend Engineer at Auchan, based in Serbia.

Source: https://himalayas.app/@savvauser

```text
Backend engineer at Auchan who extracted order processing from a legacy monolith with zero downtime and eliminated duplicate orders.
```

| Detail | Value |
| --- | --- |
| Availability | Looking for a job |
| Location | Serbia |
| Authorized to work in | Serbia |
| Salary expectations | 55k+ EUR |
| Job categories | Backend Engineer, Technical Lead |
| Skills | Go, Backend Engineering, Event Driven Architecture, Monolith Decomposition, Performance Optimization, Kafka, PostgreSQL, Redis, Distributed Tracing, Outbox Pattern, Saga, Idempotent Consumer, Partitioning, Query Tuning, high load systems |
| LinkedIn | https://linkedin.com/in/savva-golang |

## About

```text
At Auchan, I’m the technical lead for the orders, inventory and promotions team, working across 15+ services. I led the extraction of order processing from a legacy monolith with zero downtime and designed a solution to eliminate duplicate orders caused by retries and Kafka redelivery.

At Leroy Merlin, I was the primary engineer for pricing and inventory services. I built inventory sync between stores and online channels, cutting out-of-stock order cancellations by half, and partitioned stock movement tables to bring heavy queries from seconds to about 250ms.

At Raiffeisen, I worked on banking projects including transaction reconciliation and a central notification service. I drove the move of reconciliation data flow from RabbitMQ to Kafka, cutting reconciliation time roughly in half.
```

## Experience

### Lead Backend Engineer (current)

Auchan. Aug 2024 - Present

```text
Technical lead of the orders, inventory and promotions team, overseeing architecture and design reviews. Led the extraction of order processing from a legacy monolith with zero downtime and reduced p99 latency of key APIs from 420ms to 200ms.
```

Skills: Go, Kafka, PostgreSQL, OpenTelemetry, Jaeger, Pprof, Distributed-Systems, Microservices, Outbox-Pattern, Idempotency, Saga, CI-CD

### Senior Backend Engineer

Leroy Merlin. Jul 2022 - Aug 2024

```text
Primary engineer for pricing and inventory services serving tens of thousands of RPS at peak. Built inventory sync between stores and online channels via Kafka, cutting out-of-stock order cancellations by half, and introduced price caching reducing database load by ~35%.
```

Skills: Go, Redis, Redis-Cluster, PostgreSQL, Kafka, Caching, Performance-Optimization, Partitioning

### Golang Developer

Raiffeisen. Apr 2019 - Jul 2022

```text
Initiated and drove the move of the reconciliation data flow from RabbitMQ to Kafka, cutting reconciliation time roughly in half. Developed nightly transaction reconciliation between card processing, the core banking system, and card scheme clearing files.
```

Skills: Go, Kafka, RabbitMQ, PostgreSQL, Partitioning, Banking, Notification-Systems, Rate-limiting

## Tech stack

- Kubernetes
- PostgreSQL
- Redis
- PHP
- Go
- Kafka
- RabbitMQ
- Grafana
- Prometheus
- OpenTelemetry
- Docker
- SQL
- Jaeger

To contact Savva, message them from this profile with a Himalayas employer account: [Hire on Himalayas](https://himalayas.app/hire).

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