Senior Software Engineer

Collins McNicholas Recruitment & HR Services Group; Cork; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Collins McNicholas Recruitment & HR Services Group is seeking a Senior Software Engineer – Data Platform in Cork. The role focuses on building a data platform with reliable ingestion, versioned APIs, and scalable storage for financial technology workloads.

You will design and deploy backend services in Python/C#/.NET, ensure reproducible results, and enable AI/ML readiness while controlling costs and performing rigorous testing.

Qualifications

• Ideally 8-10 years experience building software, including backend services you designed, deployed and ran in production.
• Backend development experience with Python, C#/.NET, Java or similar. Python and C# are the main technologies used.
• Strong distributed systems knowledge, including idempotency, concurrency, ordering, retries and exactly-once processing.
• Strong testing practices, including unit/integration testing and CI.
• Experience evolving APIs and data schemas, including versioning and backward compatibility.
• Strong SQL skills and an understanding of cloud data warehouse performance and costs.
• Collaborative approach, with experience mentoring through code reviews, pairing and clear documentation.

Responsibilities

• Event-driven ingestion: Build reliable data ingestion services that handle retries, redelivery, reordering and late changes while ensuring exactly-once results.
• Versioned APIs & contracts: Develop secure, tested and versioned APIs, SDKs and data feeds that can evolve without disrupting downstream teams.
• Accurate, reproducible data: Build point-in-time history and precise decimal calculations into the platform so results can always be reproduced.
• Scalable & cost-efficient: Scale services and storage significantly while maintaining performance and controlling costs through measurement and load testing.
• Self-service onboarding: Build tooling and services that enable new products and customers to onboard quickly within a multi-tenant platform.
• AI/ML-ready data: Ensure customer data is accessible for AI and ML while maintaining strong contracts, tenant separation and reproducibility.
• Built-in operability: Implement SLOs, monitoring, alerting and CI controls, while taking ownership of incidents and preventing recurrence.

Skills

Backend development

Python

C#/.NET

Java

Distributed systems

SQL

Testing/CI

Code reviews

Tools

Snowflake

dbt

Terraform

Azure Functions

Container Apps

Service Bus

GitHub Actions

Job description

Senior Software Engineer – Data Plaftorm

Location: Cork, Ireland (Hybrid – 3 days in office, 2 from home)

Industry: Financial Technology

• Key Responsibilities:Event-driven ingestion: Build reliable data ingestion services that handle retries, redelivery, reordering and late changes while ensuring exactly-once results.
• Versioned APIs & contracts: Develop secure, tested and versioned APIs, SDKs and data feeds that can evolve without disrupting downstream teams.
• Accurate, reproducible data: Build point-in-time history and precise decimal calculations into the platform so results can always be reproduced.
• Scalable & cost-efficient: Scale services and storage significantly while maintaining performance and controlling costs through measurement and load testing.
• Self-service onboarding: Build tooling and services that enable new products and customers to onboard quickly within a multi-tenant platform.
• AI/ML-ready data: Ensure customer data is accessible for AI and ML while maintaining strong contracts, tenant separation and reproducibility.
• Built-in operability: Implement SLOs, monitoring, alerting and CI controls, while taking ownership of incidents and preventing recurrence.
• Requirements:Ideally 8-10 years experience building software, including backend services you designed, deployed and ran in production.
• Backend development experience with Python, C#/.NET, Java or similar. Python and C# are the main technologies used.
• Strong distributed systems knowledge, including idempotency, concurrency, ordering, retries and exactly-once processing.
• Strong testing practices, including unit/integration testing and CI.
• Experience evolving APIs and data schemas, including versioning and backward compatibility.
• Strong SQL skills and an understanding of cloud data warehouse performance and costs.
• Collaborative approach, with experience mentoring through code reviews, pairing and clear documentation.
• The stack is Python and C#/.NET, Snowflake, dbt, Terraform, Azure (Functions, Container Apps, Service Bus), GitHub Actions.
• Ability to work within a small team with high autonomy.