Eviden is a company within the worldwide operating Atos Group with an annual turnover of around €5 billion and a global leader in data-driven, trustworthy and sustainable digital transformation. As a leading international player in the fields of digital, cloud, data, advanced computing and digital security, Eviden's 55,000 experts possess in-depth expertise across all industries in more than 47 countries.

Among other things, Eviden Austria develops innovative, highly available, safety-critical systems in the field of critical infrastructure, such as rail, as well as energy supply and the public sector.
Let's work together to create powerful, sustainable and future-proof digital platforms!

Due to our positive business development, we are looking for a

Lead Software Developer – Mission Critical Backend Communication Systems (m/w/d)

(Hybrid working, HQ Wien)

Role Overview:

We are seeking a forward-thinking, hands-on technical Team Lead to drive the software development of our next-generation, mission-critical communications platform. In this role, you will lead an agile team building horizontally scalable, low-latency, and fault-tolerant services. We are looking for a leader who is not only a master of distributed systems but also fluent in modern engineering workflows, integrating AI-assisted and agentic development to boost team velocity safely. If you thrive on solving complex engineering problems where downtime is not an option, this is the place for you.

Key Responsibilities:

• Leadership & Mentorship: Provide technical, hands-on leadership to the software engineering team, ensuring alignment with architectural best practices. Mentor developers, conduct code reviews, and foster a collaborative, high-performance culture.
• Modern Engineering & Agentic Development: Champion the adoption of AI-assisted coding tools and agentic development workflows to automate repetitive tasks, accelerate feature delivery, and raise quality — while establishing the guardrails that keep AI-generated code correct, reviewed, and production-safe.
• High-Availability Architecture: Lead the design and evolution of a horizontally scalable, cloud-native services architecture optimized for 99.999% uptime and zero single points of failure.
• Real-Time Distributed Computing: Design and implement resilient, event-driven systems built on high-throughput distributed messaging (e.g., Kafka, RabbitMQ) to handle concurrent data and media streams.
• Event-Sourced State Management: Architect event-sourced services and CQRS-style read/write models with deterministic, replayable state — ensuring auditability and consistent recovery across nodes.
• Security & Data Protection: Drive security-by-design across the platform: encryption in transit and at rest, key management, authentication/authorization, and secure handling of sensitive traffic in regulated, high-assurance environments.
• Programming Excellence: Drive high code quality standards, leveraging deep expertise in a fully-fledged backend language (Go, C++, Java, C#) while establishing validation guardrails for AI-generated code.
• Orchestration & Containerization: Oversee containerization strategies and manage complex service orchestration.
• High-Performance Networking: Implement secure, fast service-to-service communication protocols, optimizing for low-latency network performance and efficient data serialization.
• Performance Engineering: Actively identify architectural bottlenecks, troubleshoot complex distributed-tracing issues, and optimize services for sub-second response times and high concurrency.
• Cross-Functional Alignment: Collaborate closely with Product, QA, and DevOps teams to ensure seamless CI/CD execution and timely delivery of critical features.

Required Skills and Qualifications:

• Experience: Minimum 7+ years in software engineering, with at least 2 years in a technical leadership or team-lead capacity.
• Language Proficiency: 5+ years of hands-on experience building enterprise-grade systems in at least one of: Go, C++, Java, C#. Go strongly preferred (or proven ability to ramp quickly to a Go-first stack).
• Distributed Systems Mastery: Proven experience designing and operating horizontally scalable architectures and event-driven systems (Kafka, RabbitMQ, or similar).
• Event Sourcing & State: Practical experience with event-sourced and/or CQRS architectures, deterministic state machines, and replay-based recovery.
• Production Kubernetes: Solid track record of deploying, scaling, and managing services in Kubernetes or Docker in production environments.
• High-Availability Design: Deep understanding of fault tolerance, circuit breaking, load balancing, and high-availability data replication.
• Security Engineering: Working knowledge of applied cryptography, key management, TLS/mTLS, and secure-by-design principles for sensitive or regulated systems.
• API Design: Strong expertise crafting standard RESTful APIs and asynchronous event schemas using OpenAPI/AsyncAPI specifications.
• Communication: Excellent written and verbal communication skills in English, with a proven ability to explain complex distributed-systems concepts to both technical and non-technical stakeholders.

Preferred Skills (Advantageous but not Required):

• Spec-Driven Development: Experience building to formal specifications or compliance-driven verification — turning rigorous, machine-readable requirements into validated, conformant code.
• Modern Dev Tooling: Practical experience integrating LLM-backed developer tools or autonomous coding agents (e.g., GitHub Copilot, agentic coding workflows) into the daily SDLC.
• Telecom Protokolls: 3GPP- and ETSI-Telecommunication standards, MCx, FRMCS
• Real-Time Media: Experience with real-time media streaming protocols or high-concurrency network programming (TCP/UDP optimization, VoIP, WebSockets, gRPC).
• Cloud & Infrastructure: Familiarity with hybrid/on-premises and private cloud environments, and infrastructure-as-code (Terraform).
• Background: Building systems for critical infrastructure, telecom-grade routing, or public safety applications.

• Solve Elite Engineering Problems: Work on a sophisticated tech stack where you solve real, hard distributed-systems problems involving horizontal scaling and high reliability.
• Pioneer Next-Gen Workflows: You'll have the autonomy and backing to put modern agentic development workflows into real production practice — not as a demo, but as how the team actually ships.
• Global, High-Stakes Impact: Be part of a team building software trusted by international clients for secure, mission-critical, on-premises deployments.
• Innovation-Driven Culture: Join a sharp, supportive team that favors clean architecture, strong tooling, and continuous learning over corporate bureaucracy.

Your annual salary will be around €90,000 gross per year. Your actual annual target salary will be determined in line with market rates, based on your qualifications and experience.

At Atos/Eviden, we want all employees to feel valued and recognised. We have developed a wide range of programmes across the globe to embed Atos' culture of inclusivity, and we work hard to ensure that all employees have equal opportunities to contribute and feel confident that they are in the right place.