Senior Site Reliability Engineer II, Traffic Routing

As a Senior Site Reliability Engineer II in the Traffic Routing team, you will help build and operate the systems that route every request into and across Vinted: our Istio gateway and the software that generates gateway (Envoy/Istio) configuration, the data center network, internal DNS and domains.

The Traffic Routing team is part of the Foundations domain within the Platform unit. We are a team of eight, and we own the path that traffic takes from the public internet down to the services running in our data centers. That spans the Istio gateway and the software we write to generate gateway configuration, the SONiC-based network operating system and the physical network underneath it, internal data-center DNS and domain management.

We care a lot about reliability and performance, and we lean on software to get there: most of our work is building and improving tooling rather than clicking through configs. You will work closely with the rest of the Foundations teams and with the product engineering teams that depend on us to reach their users.

• Build and improve the software that generates and ships Istio gateway configuration, so traffic is routed safely and predictably.
• Automate and own operations for internal data-center DNS, domains, and the Postfix mail clusters.
• Profile and tune Linux and our network data path for latency and throughput, and remove bottlenecks wherever they appear.
• Design and run the tooling that lets us roll out config changes gradually and roll them back fast when something looks wrong.
• Work with the SONiC network OS and the physical network to keep the data-center fabric reliable and observable.
• Define and track SLOs for the routing layer, and improve our monitoring, alerting, and incident response.
• Partner with product engineering teams to make it easy and safe for them to expose their services.
• Take part in a shared, paid on-call rotation across our team
• Build eventually consistent systems to keep data synchronized across cross-Atlantic markets without sacrificing performance.
• Shift live traffic between regions and data centers with no downtime, and make rollbacks boring and instant.
• Squeeze latency and CPU out of the Linux network data path under heavy, bursty load.
• Make the routing layer observable enough that we can find the one bad hop among many before users notice.

• Have solid experience writing production software in Go, Python, C++, or a similar language.
• Have a strong understanding of Linux and a track record of debugging and tuning systems for performance.
• Are comfortable owning infrastructure as code and automating operational work with configuration management tools like Ansible and Chef, rather than doing it by hand.
• Think in terms of reliability: SLOs, monitoring, alerting, and learning from incidents.
• Communicate effectively in English, both written and spoken.
• Are a curious, responsible engineer who enjoys learning the technologies we use and digging into how things really work.

Nice to have

• Advantage: hands-on experience with networking fundamentals (TCP/IP, BGP, DNS) or running networks at scale.
• Advantage: experience with Istio, Envoy, or other service-mesh / proxy technologies.
• Advantage: familiarity with SONiC, Cumulus, or other switch/network operating systems.
• Advantage: experience operating Postfix or other mail infrastructure.

• The opportunity to benefit from our share options programme
• 25 working days of holiday
• Access to all the tools & tech needed for work
• Home office support: we provide IT workstation equipment and a personal budget of up to 540 for home workplace furniture
• Private health insurance
• Confidential Employee Assistance Program (EAP) for you and your family
• Frequent team-building events
• A personal monthly budget for shopping on Vinted
• The opportunity to spend up to 90 days per year - 21 of which can be spent working outside of the EU - on workation
• A dog-friendly office
• In Vilnius office: Gym & in-house meals at friendly prices
• In Kaunas office: a monthly lunch allowance, and a once-a-week provided in-house lunch and breakfast