COMPANY PLAYBOOK
Langfuse
System principles
- Make multi-stage work visible as a project.
- Give new joiners context and growing ownership.
- Discuss a problem resembling the candidate’s future work.
Tensions and trade-offs
- Weekly visibility improves coordination, but updates can go stale.
- Work-like selection and early ownership provide stronger signals but require candidate and team time.
PRACTICES
How Langfuse builds its operating system
Use project updates to plan the engineering week
Multi-stage work goes into a Linear project; updates when things change are read together at the engineering weekly to plan the coming week.
- How it works
- Engineers manage their priorities and escalate overload to a lead; project changes are written down and reviewed in a weekly cadence.
- Why it is used
- Makes the state of multi-stage work and next week’s dependencies visible to the team.
- Trade-off
- A missed update makes the weekly plan rely on stale information and adds documentation overhead.
- Best fit
- Product teams running parallel, multi-stage engineering projects.
Grow engineering ownership through onboarding milestones
The engineering onboarding guide sets goals from a first-week production contribution to an independent project in months one to three and product-area ownership by month six; these are guide targets, not verified outcomes for every hire.
- How it works
- The new hire receives company context and tool access on day one; timed expectations and team support guide the move from contribution to project to domain expertise.
- Why it is used
- Makes the intended timing and scope of a new engineer’s independence visible.
- Trade-off
- One timeline may not fit individual learning or project complexity; a target is not a guaranteed result.
- Best fit
- Teams preparing new engineers for product-area ownership.
Assess engineers through past projects and feature design
The stated engineering hiring flow includes a past-project deep dive, feature design with an engineer and an onsite Super Day with work-like problems; other roles may follow different steps.
- How it works
- Past projects are discussed first; the candidate then designs a possible feature and later works together on problems resembling the role.
- Why it is used
- Produces concrete signals about product thinking and collaboration alongside past contributions, beyond the résumé.
- Trade-off
- A multi-stage interview takes candidate and employee time; the source does not specify payment or universal coverage across roles.
- Best fit
- Teams seeking to observe product and engineering collaboration in hiring.
Code review by reversibility
At Langfuse low-risk, reversible PRs can be merged without review; the author watches the rollout and reverts if needed. Irreversible changes (database migrations, public API/SDK signatures, authentication, the ingestion pipeline, large infrastructure) go through CTO review within 24 hours. New joiners have every PR reviewed during their first month.
- How it works
- Whether review is required depends on reversibility rather than on the type of change: two-way doors move fast under the author’s responsibility, one-way doors go to a named reviewer with a time limit. The safety net is monitoring plus rollback through on-call.
- Why it is used
- Spends review effort where mistakes are expensive, keeps the team fast and leaves accountability for quality with the author.
- Trade-off
- Risk judgement is left to the author, so a misclassified change can ship unreviewed. Review of risky changes concentrates on one person, and the rule may change as the team grows.
- Best fit
- Small, senior engineering teams with strong monitoring and easy rollback.