Senior Backend Engineer, Core APIs

About the role

We are looking for a Senior Backend Engineer to join a globally distributed team building high‑performance backend systems that power large‑scale, real‑time fraud detection applications. The role is fully remote and based in Ireland, offering the chance to design, develop and optimise scalable APIs and distributed services.

Key responsibilities

• Design, develop and maintain backend systems and APIs capable of processing large volumes of real‑time data with high reliability.
• Build, optimise and enhance distributed services while ensuring seamless integration across platform components.
• Investigate complex technical issues through root‑cause analysis, experimentation and performance testing.
• Monitor, debug and optimise services to maintain system stability and operational efficiency.
• Collaborate with cross‑functional engineering teams to deliver production‑ready solutions.
• Participate in an on‑call rotation to support rapid incident resolution.
• Promote engineering best practices and mentor junior engineers.

Required profile

• 5+ years of professional backend software engineering experience.
• Strong hands‑on experience with Go (Golang) and/or Node.js.
• Proven ability to design and maintain scalable APIs, microservices and real‑time processing platforms.
• Solid understanding of distributed systems architecture and performance optimisation.
• Excellent English communication skills and experience working in fully remote, international teams.

Required skills

• Go (Golang)
• Node.js
• SQL databases
• DynamoDB
• Redis
• Elasticsearch
• Git
• CI/CD pipelines
• Shell scripting