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Writing Python (nice) Training Marketing Recruiting

What this posting asks for

Level: Lead / staff — The title says "Principal".

Main responsibilities

• Set the technical vision and architecture.
• Own the multi-year architecture and roadmap for Optimize's streaming, batch and serving systems.
• Decide what to build, buy, consolidate or retire, and make the trade-offs between freshness, correctness and cost explicit.
• Write the tech strategy docs and lead the design reviews that set direction across the team.
• Be accountable for data correctness and reliability at scale.
• Define the standards for handling late and out-of-order data, backfills, replays and data-quality validation.
• Define the SLOs and the loss/lag alerting (late-drop rate, consumer lag, input-vs-output gaps) that creators' trust depends on.
• Lead response to the most serious data incidents, drive blameless postmortems, and make sure the fixes stop the whole class of failure, not just the one inst…
• Take part in the team's PagerDuty on-call rotation.
• Lead performance, scale and cost.

Competencies an interviewer will look for

• Technical skill Core
  In the posting: “You'll define where this architecture goes over the next several years, lead the hardest problems in it hands-on, and raise the technical bar of the engineer…” · “Set the technical vision and architecture.” · “Own the multi-year architecture and roadmap for Optimize's streaming, batch and serving systems.”
  Show it by: Names the tools, languages or systems used and how; Explains a technical choice and its trade-off.
• Ownership and accountability Core
  In the posting: “We're looking for a principal engineer to set the technical direction for the data systems behind these products and to be accountable for how they perform a…” · “You'll own the strategy that makes creator data faster, cheaper and more correct, so that creators can trust the numbers they make decisions on.” · “Own the multi-year architecture and roadmap for Optimize's streaming, batch and serving systems.”
  Show it by: Takes a task from start to finish without being chased; Owns a mistake and what was changed after it.
• Leadership and mentoring Core
  In the posting: “Mentor senior engineers and grow the next technical leaders on the team.” · “Partner with engineering, product and design leadership on planning and prioritization.” · “Operational leadership: has defined SLOs, monitoring and alerting (Grafana/Prometheus-style), and led the response to and postmortems of major production inc…”
  Show it by: Describes setting direction or a standard others followed; Names someone they coached and what changed for them.
• Data and analysis Core
  In the posting: “Creator Hub analytics dashboards and benchmarks;” · “We're looking for a principal engineer to set the technical direction for the data systems behind these products and to be accountable for how they perform a…” · “You'll own the strategy that makes creator data faster, cheaper and more correct, so that creators can trust the numbers they make decisions on.”
  Show it by: Uses a number to describe the situation or the result; Explains what the data showed and what was done with it.
• Attention to detail and quality Core
  In the posting: “experiments (A/B testing), Remote Configs and Segmentation;” · “Define the standards for handling late and out-of-order data, backfills, replays and data-quality validation.” · “Own capacity planning and load testing for seasonal peaks across the pipelines.”
  Show it by: Gives an example of an error caught before it caused harm; Names the check or standard they used.
• Teamwork and collaboration Core
  In the posting: “Partner with IXP and Data Science on statistical correctness and metric definitions.” · “Partner with engineering, product and design leadership on planning and prioritization.”
  Show it by: Says what they did inside a team, not only what 'we' did; Shows how a disagreement was handled.
• Planning and organisation Core
  In the posting: “Own capacity planning and load testing for seasonal peaks across the pipelines.” · “Partner with engineering, product and design leadership on planning and prioritization.”
  Show it by: Shows how priorities were set when everything was urgent; Mentions deadlines met and how.
• Stakeholder management Core
  In the posting: “Build alignment and drive multi-team initiatives to completion, influencing without authority.” · “Influence and communication: clear, persuasive writing (strategy docs, tech specs, postmortems) and a record of building alignment across teams and with seni…”
  Show it by: Shows how they aligned people with different goals; Explains how they handled a 'no' from someone senior.
• Problem solving Supporting
  In the posting: “A career at Roblox means you’ll be working to shape the future of human interaction, solving unique technical challenges at scale, and helping to create safe…”
  Show it by: Describes a real problem, the options considered and the one chosen; Shows how the cause was found, not just the fix.
• Communication Supporting
  In the posting: “Influence and communication: clear, persuasive writing (strategy docs, tech specs, postmortems) and a record of building alignment across teams and with seni…”
  Show it by: Adapts the message to the listener; Gives an example of explaining something clearly in writing or speech.

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