Software Engineer – Edge Traffic & Security Platforms

Cpl-b0b74daf; Dublin; On-site; EUR 69,000 - 85,000; Full time

Job summary

Cpl Group in Dublin is seeking a senior Software Engineer for a 9-month contract to work on edge traffic security platforms. You will optimize security platforms, migrate legacy infrastructure, and collaborate with a world-class team.

Tech stack includes Envoy, eBPF, HAProxy, Rust, Go, and C++. The role focuses on building scalable distributed systems and delivering secure, high-performance networking solutions for global users.

Qualifications

• Education: BA/BS degree or higher in CS or related field.
• Core experience: 5+ years of software design and development.
• Programming languages: Go, Rust, C, or C++.
• Distributed systems & networking: large-scale systems, TCP/IP, HTTP, DNS, eBPF.
• Migration: experience migrating live-production legacy infra.
• Open-source traffic infra: Envoy, HAProxy, Apache Traffic Server.

Responsibilities

• Platform Engineering: design, deploy, and optimize edge traffic security platforms over Envoy, HAProxy, IPVS, eBPF, and WAF architectures.
• Legacy Migration: migrate large-scale legacy systems to modern infra without production traffic impact.
• Operational Excellence: address root causes and reduce incident backlogs.
• Support & Hygiene: triage issues and maintain runbooks and docs.

Skills

BA/BS in CS or related field

Distributed systems

5+ years software design & development

Migration experience

Open-source traffic infra knowledge

Education

BA/BS in Computer Science or related field

Tools

Envoy

HAProxy

Rust

Go

C++

Apache Traffic Server

Coraza

ModSecurity

Job description

Software Engineer - Edge Traffic & Security Platforms

Salary: €77,000 per annum Dublin 9-Month Contract

Looking to work on high-impact infrastructure handling mission-critical traffic for hundreds of millions of global users securely?

A leading global technology platform based in Dublin is looking for a senior-level Software Engineer for an immediate 9-month contract. In this role, you aren't just maintaining a system—you will actively optimize security platforms, burn down architectural debt, and migrate critical legacy infrastructure alongside a world-class team.

Tech Stack: Envoy, eBPF, HAProxy, Rust, Go, C++

Key Responsibilities:

• Platform Engineering: Design, deploy, and optimize edge traffic security platforms built over Envoy, HAProxy, IPVS, eBPF, and WAF architectures to maximize global traffic flow.
• Legacy Migration: Safely migrate large-scale, critical legacy systems and codebases to modern infrastructure without impacting live production traffic.
• Operational Excellence: Eliminate operational and incident-action-item (Incident-AI) backlogs by addressing root causes rather than applying quick patches.
• Support & Hygiene: Triage technical issues in the teams Slack channels while continuously refining production runbooks and engineering documentation.

Required Skills & Qualifications

• Education: BA/BS degree or higher in Computer Science, a related technical discipline, or equivalent practical experience.
• Core Experience: 5+ years of software design and development experience, with a strong focus on algorithm-related solutions.
• Programming Languages: 5+ years of experience programming in Go, Rust, C, or C++.
• Distributed Systems & Networking: Hands-on experience with large-scale distributed systems and core L4 to L7 networking protocols (TCP/IP, HTTP, DNS, eBPF).
• Migration Strategy: Proven experience managing large-scale migrations of live-production legacy infrastructure.
• Experience with open-source traffic infrastructure software: Experience with Envoy, HAProxy, Apache Traffic Server.
• Working knowledge of WAF implementations (e.g., Coraza, ModSecurity), DDoS mitigation engines, rate-limiting frameworks, and TLS/mTLS termination at scale.
• Exposure to traffic delivery systems across CDNs, load balancers, and routing matrices.