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Backend Scala Developers

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Coralogix
ZF
Riskified
Hypervolt
Paidy
Tiko
Writer
Commercetools
Ledger
CNH
SiriusXM
Leonteq
Arteris
ITV
Linklaters
ClearScore
Guardian
VakantieDiscounter
IOHK
Coralogix
ZF
Riskified
Hypervolt
Paidy
Tiko
Writer
Commercetools
Ledger
CNH
SiriusXM
Leonteq
Arteris
ITV
Linklaters
ClearScore
Guardian
VakantieDiscounter
IOHK
341+
Verified Candidates
14+
Avg. Years Experience
Top Skills
Scala Kafka Kubernetes Java
Deep Scala Network

Built through years working with teams and engineers in the Scala ecosystem.

Deep Technical Focus

We specialize in functional backend systems, data platforms, and distributed infrastructure.

Signal Over Volume

Focused, relevant introductions from a curated network.

Available Developers

ZK-8186 Principal Recently added

CTO, CO-FOUNDER

Finland
25 years
Flexible
Employee / Freelancer

Architected a large-scale multiplayer game engine supporting millions of concurrent users, leveraging deep expertise in Linux kernel optimizations and C++. Pioneered the development of a cloud-native platform, enhancing scalability and reliability for distributed systems. Spearheaded the integration of Rust in performance-critical components, reducing latency and increasing throughput.

  • Designed real-time physics engine for AAA games
  • Implemented secure, low-latency networking protocols
  • Optimized cloud cost with efficient resource allocation
Linux kernel game development cloud infrastructure product management Rust C++
Interviewing now €90k-120k/yr
Enquire
NP-9742 Senior Recently added

Senior Go Backend Developer

France
8 years
Remote
Employee / Freelancer

Designed and implemented robust backend services for large-scale e-commerce platforms. Developed API gateways to streamline service communication and enhance system reliability. Optimized PostgreSQL databases for high-volume transaction processing.

  • Deployed containerized applications using Kubernetes for seamless scalability.
  • Integrated third-party payment solutions via secure API protocols.
  • Automated CI/CD pipelines to accelerate deployment cycles.
Go Golang Backend Services APIs PostgreSQL Kubernetes
Available in 2 weeks Salary on request
Enquire
#HIRED Lead Recently hired

Senior Scala Backend Engineer

Switzerland
7 years
Hybrid
Employee
Experienced software engineer with strong background in distributed systems and cloud-native architecture. Proven track record delivering production systems at scale. Skilled in designing fault-tolerant services, optimising CI/CD pipelines, and mentoring junior developers across cross-functional teams.
  • Led migration of monolithic system to microservices architecture
  • Built high-throughput data pipeline processing 1M+ events per second
  • Designed and implemented real-time monitoring and alerting platform
Scala ZIO gRPC Redis Kubernetes Terraform PostgreSQL Docker
Hired Salary: $XXX,XXX
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WK-9239 Principal

Senior Kotlin backend developer

Sweden
25 years
Hybrid
Employee / Freelancer

Designed and implemented large-scale microservices architectures using Scala for financial transaction systems, ensuring high availability and fault tolerance. Developed real-time data processing pipelines for a cloud-based analytics platform, optimizing for low latency and high throughput. Contributed to the development of reactive systems, enhancing system responsiveness and scalability in distributed environments.

  • Led migration of legacy Java systems to Kotlin microservices
  • Implemented event-driven architecture for a retail analytics platform
  • Optimized cloud resource allocation, reducing operational costs by 30%
  • Developed secure API gateways for fintech applications
Java Scala Kotlin Microservices Reactive architecture Cloud
Available in 1 month €100k-140k/yr
Enquire
AP-1643 Lead

Lead Software Engineer

Switzerland
10 years
Remote
Employee

Designed and implemented distributed systems for high-frequency trading platforms, focusing on low-latency data processing using Akka and Scala. Architected microservices for a large-scale e-commerce application, leveraging Vert.x to handle millions of concurrent transactions efficiently. Developed a real-time analytics engine for IoT data streams, optimizing performance on JVM environments.

  • Optimized JVM performance for large-scale data processing applications
  • Integrated Node.js with Scala for hybrid application architectures
  • Implemented complex event processing with Akka Streams
  • Built RESTful APIs using TypeScript for scalable web services
Scala JVM Node.js TypeScript Vert.x Akka
Interviewing now $150k-180k/yr
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SS-9069 Senior

Software Engineer, Backend

Singapore
6 years
Flexible
Employee / Freelancer

Engineered backend systems using Scala with a focus on functional programming. Built fault-tolerant services with ZIO for distributed systems. Developed GraphQL APIs using Caliban for seamless client-server interactions.

  • Utilized Cats library for functional programming patterns
  • Optimized SQL queries for high-volume transaction systems
  • Developed Python utilities for backend service monitoring
Scala SQL Python ZIO Cats Caliban
Interviewing now $100k-120k/yr
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KW-3297 Principal

Backend Engineer

United States
22 years
Remote
Freelancer

Designed and implemented a distributed ledger system for financial transactions, optimizing consensus protocols for latency and throughput. Spearheaded the development of a real-time event processing pipeline, handling billions of messages per day with sub-second latency. Architected a microservices platform for a large-scale e-commerce application, focusing on scalability and fault tolerance.

  • Developed a custom RPC framework in Rust for microservices
  • Optimized JVM performance for high-frequency trading applications
  • Implemented a distributed caching system, reducing data retrieval time by 70%
  • Led migration of monolithic architecture to microservices, improving deployment speed
Java Rust Scala Distributed systems Microservices Event-driven architecture
Interviewing now $110-110/hr
Enquire
LP-4770 Principal

Senior Software Engineer & Distributed Systems

France
20 years
Remote
Employee / Freelancer

Designed and implemented a petabyte-scale data processing platform using distributed systems technologies. Spearheaded the development of a real-time streaming analytics solution for IoT data ingestion.

  • Architected a multi-tenant data platform
  • Led a team in building a batch processing system
  • Implemented a fault-tolerant message queue
Backend development Systems Programming Rust Go Scala API Design
Interviewing now €90k-110k/yr
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EF-5005 Lead

Senior Rust Engineer

United States
18 years
Remote
Employee / Freelancer

Designed and implemented a high-performance, low-latency trading platform using Rust, optimizing for concurrency and memory safety. Developed a distributed caching system in Go that significantly reduced data retrieval times for large-scale applications. Architected a real-time analytics engine utilizing Python and SQL to process and visualize terabytes of data daily.

  • Built a custom consensus protocol for distributed systems
  • Led migration of monolithic architecture to microservices in Typescript
  • Optimized C# backend systems for a 40% increase in throughput
  • Implemented CI/CD pipelines for automated deployments using Docker and Kubernetes
Python Go Typescript C# SQL Rust
Interviewing now $120k-140k/yr
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AM-1682 Mid-level

Scala Backend Developer

Poland
3 years
Flexible
Employee / Freelancer

Developed high-throughput data processing pipelines using FS2 and Cats Effect. Implemented tagless-final style architectures to enhance modularity and testability of backend services. Contributed to the design of a reactive microservices ecosystem optimized for fault tolerance.

  • Built scalable event-driven systems with Scala and Kafka
  • Integrated functional programming paradigms for robust error handling
  • Optimized JVM performance for low-latency applications
Scala Java Cats Cats Effect FS2 tagless-final
Available in 2 weeks €30k-35k/yr
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RV-8085 Senior

Senior Backend Engineer

Colombia
10 years
Remote
Employee / Freelancer

Architected high-performance microservices for large-scale e-commerce platforms. Integrated SQL and NoSQL databases to enhance data querying capabilities.

  • Implemented RESTful APIs with Kotlin and Java
  • Led migration of legacy systems to cloud-based architecture
  • Enhanced system scalability with asynchronous processing
Java Kotlin Scala Python SQL JavaScript
Available in 2 weeks $97k-120k/yr
Enquire
SB-3635 Lead

Sr. Backend Software Engineer

India
9 years
Flexible
Employee / Freelancer

Developed high-throughput distributed systems in Rust and Scala, focusing on real-time data processing. Built scalable microservices architecture leveraging Actix Web and Tokio for concurrent processing. Extensive experience in performance optimization for low-latency applications.

  • Designed scalable microservices with Actix Web
  • Optimized low-latency systems using Rust
  • Implemented real-time data processing pipelines
Scala Functional Programming Microservices RESTful APIs Kafka FS2
Interviewing now Salary on request
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SA-6380 Senior

Backend Software Engineer

Netherlands
10 years
Flexible
Employee

Developed scalable messaging systems using Kafka and ActiveMQ, optimizing data flow for real-time analytics. Architected microservices with ZIO to enhance fault tolerance and concurrency control in distributed environments.

  • Designed high-throughput data pipelines with Protobuf serialization.
  • Optimized PostgreSQL queries for complex reporting applications.
  • Implemented event-driven architectures for financial transaction processing.
Scala ZIO PostgreSQL ActiveMQ Kafka Protobuf
Available in 2 weeks Salary on request
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ST-6011 Principal

Senior Backend Engineer

Germany
13 years
Remote
Employee

Engineered backend systems with Go and Scala, focusing on real-time data processing. Developed scalable search solutions with Elasticsearch in distributed environments.

  • Engineered real-time data systems
  • Developed Elasticsearch search solutions
  • Optimized Go-based backend services
Go Node.js Elasticsearch Scala Python Kubernetes
Available in 3+ months Salary on request
Enquire
KK-5038 Lead

Senior Backend Engineer

Netherlands
18 years
Flexible
Employee / Freelancer

Led the development of a distributed event-driven architecture using Akka for a high-frequency trading platform, optimizing latency to sub-millisecond levels. Developed and deployed a real-time analytics pipeline with Kafka, processing millions of events per second for a large-scale e-commerce platform. Spearheaded the migration of legacy systems to functional programming paradigms, significantly improving code maintainability and performance.

  • Architected microservices for scalable financial transaction systems
  • Implemented machine learning models for fraud detection in Scala
  • Designed RESTful APIs supporting thousands of concurrent users
  • Optimized JVM performance for large-scale data processing tasks
Scala Java Python Functional Programming Akka Kafka
Available in 2 weeks €70k-85k/yr
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