Lead Site Reliability Engineer

Location: Bangalore - Indraprastha, India

Thales is a global technology leader trusted by governments, institutions, and enterprises to tackle their most demanding challenges. From quantum applications and artificial intelligence to cybersecurity and 6G innovation, our solutions empower critical decisions rooted in human intelligence. Operating at the forefront of aerospace and space, cybersecurity and digital identity, we’re driven by a mission to build a future we can all trust.

Present in India since 1953, Thales is headquartered in Noida and has other operational offices and sites spread across Delhi, Gurugram, Bengaluru and Mumbai, among others. Over 2200 employees are working with Thales and its joint ventures in India. Since the beginning, Thales has been playing an essential role in India’s growth story by sharing its technologies and expertise in Defence, Aerospace and Cyber & Digital sectors. Thales has two engineering competence centres in India - one in Noida focused on Cyber & Digital business, while the one in Bengaluru focuses on hardware, software and systems engineering capabilities for both the civil and defence sectors, serving global needs. The Group has also established an MRO (Maintenance, Repair & Overhaul) facility in Gurugram to provide comprehensive avionics maintenance and repair services to Indian airlines and support the growth of the local aviation industry.

Responsibilities

• Apply SRE core tenets of measurement (SLI/SLO/SLA), eliminate toil, and reliability modeling
• Enable and educate development teams on industry best practice design patterns, ways of working and operational knowledge to ensure platform continuity
• Develop and architect solutions to infrastructure and operational aspects of new products and feature sets
• Assist with go/no go preplanning, verification/validation, and review of existing and new product/services
• Proactively analyze data and test the integrity of network/systems to ensure production applications and services are operating optimally
• Work within development teams to troubleshoot and resolve business affecting issues
• Escalations, incident response, RCA, and blameless postmortem
• Participate in on-call rotation

Qualifications

• At least 7+ years of professional experience within a cloud/web/CDN scale infrastructure
• Expert Linux troubleshooting in production: isolate CPU vs memory vs IO vs network bottlenecks quickly; hands-on with top/htop, vmstat, iostat, sar, pidstat, ss, lsof, dmesg, and journald/systemd.
• Strong networking fundamentals + practical debugging: deep understanding of TCP/UDP and routing basics; can prove issues using curl, dig, mtr/traceroute, nc, and tcpdump.
• DNS & HTTP(S) clarity: understands resolver vs authoritative, TTL/caching, SERVFAIL/NXDOMAIN patterns; knows HTTP 502/503/504 meaning and common LB/proxy failure modes.
• TLS/SSL proficiency: understands certificate chain, expiry, SNI mismatch, handshake failures; can validate quickly using openssl s_client and interpret output.
• Production mindset: prioritizes mitigation first (rollback/disable/route around), then RCA; writes clear runbooks and automates repeat fixes to reduce toil.
• Expert knowledge of Linux systems, network programming and protocols TCP, UDP, DNS, TLS/SSL, HTTP
• Experience with BGP and Anycast routing is a plus
• Experience with DevOps principles and concepts such as Infrastructure as Code (Ansible/Saltstack), CI/CD (Gitlab, Jenkins, Git), monitoring and visualization (Prometheus, Grafana)
• Experience with big data technologies such as NoSQL/RDBMS, Redis, ElasticSearch, Kafka
• Experience with containers and container management  (Docker, Kubernetes)
• Experience analyzing and building data telemetry, modeling, pipelines, UI visualization
• Experience in developing software, troubleshooting, and monitoring large scale distributed systems
• Implement software engineering best practices/standards and software development life cycle
• Working knowledge and experience of Agile software development methodologies
• A strong team player who is accountable towards business urgency
• Ability to stay organized in a multi-tasking environment
• Self-starter personality

At Thales, we’re committed to fostering a workplace where respect, trust, collaboration, and passion drive everything we do. Here, you’ll feel empowered to bring your best self, thrive in a supportive culture, and love the work you do. Join us, and be part of a team reimagining technology to create solutions that truly make a difference – for a safer, greener, and more inclusive world.