Zdravko is available for hire

Zdravko Kosanovic

Verified Expert in Engineering

Back-end Developer

Location

Dubai, United Arab Emirates

Toptal Member Since

November 15, 2022

Zdravko is a senior back-end engineer with more than five years of experience in various industries, from telecommunications to fintech. He is proficient in Go and has extensive experience working with cloud providers such as AWS, GCP, and Heroku. Zdravko loves solving problems in a distributed cloud environment and developing and managing microservices.

Back-end Distributed Systems Docker Amazon Web Services (AWS)Go Microservices SQL Relational Databases Redis PostgreSQL Kubernetes Java Apache Kafka gRPC JavaScript

Portfolio

Rain

Go, PostgreSQL, Redis, Apache Kafka, Heroku, Docker, Microservices, SQL...

Symphony

Go, Protobuf, gRPC, PostgreSQL, Google Cloud Platform (GCP), Kubernetes, Docker...

LotusFlare

Scala, Java, Lua, Amazon Web Services (AWS), Apache Kafka, Docker, Redis...

Experience

Docker - 5 years Amazon Web Services (AWS) - 5 years Microservices - 4 years Go - 4 years Redis - 3 years PostgreSQL - 3 years Apache Kafka - 2 years gRPC - 2 years

Availability

Part-time

Preferred Environment

MacOS, GoLand, Docker, GitHub, Amazon Web Services (AWS)

The most amazing...

...thing I've developed with my team is a complete digital platform and infrastructure for one of the biggest telecommunication operators in South America.

Work Experience

Senior Back-end Engineer

2020 - 2022

Rain

Built Rain Pro, an advanced trading platform for experienced cryptocurrency traders.
Ensured 99.9% uptime of both Rain Core brokerage and Rain Pro trading platforms.
Developed several tools and 3rd-party service integrations to help Rain's growth, marketing, and customer experience teams reduce user churn and speed up growth.

Technologies: Go, PostgreSQL, Redis, Apache Kafka, Heroku, Docker, Microservices, SQL, Distributed Systems, Relational Databases, Back-end

Software Engineer

2019 - 2020

Symphony

Created a digital life insurance platform as part of the Symphony team working as a contractor for a US-based startup.
Owned several core services within the microservice architecture after fully integrating into the client's engineering team, handling new features' development, testing, and monitoring.
Oversaw the platform's stability and availability, ensuring 99.9% uptime.

Technologies: Go, Protobuf, gRPC, PostgreSQL, Google Cloud Platform (GCP), Kubernetes, Docker, Microservices, SQL, Distributed Systems, Relational Databases, Back-end

Software Engineer

2018 - 2019

LotusFlare

Contributed as part of the server team building LotusFlare's core product, the Digital Network Operator platform, a next-gen software stack for telecom operators.
Engaged with the team in designing and developing the platform's features and creating its most successful operator-specific deployment at the time.
Oversaw and supported the platform we built from scratch and saw it grow from zero to having over five million daily active users.

Technologies: Scala, Java, Lua, Amazon Web Services (AWS), Apache Kafka, Docker, Redis, Apache Cassandra, ClickHouse, Jenkins, Prometheus, Microservices, Distributed Systems, Back-end, Grafana

Experience

Rain Pro Platform

https://www.rain.com/en-ae/learn/everything-you-need-to-know-about-rain-pro

Rain Pro is a powerful, advanced trading platform for experienced cryptocurrency traders.

It was built as an evolution of the then-existing, simple, brokerage-based trading model of the Rain crypto exchange.

LotusFlare DNO Platform

https://www.youtube.com/watch?v=_UteggVyoiU

Digital Network Operator (DNO) is a telecommunications platform that lets operators deliver an excellent and fully digital mobile experience. I worked as part of the server engineering team designing and developing the platform from scratch, up to its multiple successful deployments.

Skills

Languages

Go, SQL, Java, JavaScript, C, Scala, Lua, Python

Paradigms

REST, Microservices

Platforms

Docker, Amazon Web Services (AWS), Kubernetes, Apache Kafka, Google Cloud Platform (GCP), Heroku

Storage

Redis, Relational Databases, PostgreSQL, NoSQL, ClickHouse

Other

Distributed Systems, Back-end, Apache Cassandra, Prometheus, WebSockets

Frameworks

gRPC

Libraries/APIs

Protobuf, React

Tools

Jenkins, Grafana

Collaboration That Works

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