Owned the ongoing health of Square's 6 published SDKs. Triaged 29 end-user GitHub issues, diagnosed root causes across our generators and Square's usage, and drove resolution either way. Halved the Python SDK's memory footprint. Became a primary contributor to the Ruby SDK v2 generator when Square needed it rebuilt.
Resolved 30 GitHub issues including TypeScript package size, Pydantic v1/v2 compatibility, streaming deserialization, and Go nil panics. Audited and fixed extraDependencies CVE override mechanism across all 6 generators. Months of responsive support built trust that directly contributed to onboarding their North SDK.
My deepest engagement. Built auto-versioning system and self-hosted docs bundle — custom infrastructure that differentiates the enterprise relationship. Fixed protobuf reference rendering, GoLang SSE streaming, Java SDK build issues. Unknown-type handling across 4 languages originated from Anduril's lattice SDK needs.
Kept Intercom's Node, Java, and PHP SDKs stable through a generation version upgrade. Resolved pagination regressions, type definition mismatches, and CI publish failures — preventing issues from reaching Intercom's end-users.
Supported ElevenLabs' SDK ecosystem across multiple languages through on-call rotations and ad-hoc support, resolving issues and keeping their published SDKs healthy.
Thomas needed demo SDKs for a Box sales meeting the next morning. Built TypeScript, Java, and Python demo SDKs from Box's OpenAPI spec overnight — got green CI checks on all three, enabled wire tests, and fixed a CLI parsing bug in the OpenAPI importer (fern#11273). Also shipped wire test infrastructure PRs for TypeScript, Java, and Python that became platform-wide assets.
Set up the initial fern-demo repo for Cohere's North SDK expansion — generated initial TypeScript and Python SDKs, discovered and resolved a non-trivial string of issues from scoping through follow-up. This groundwork directly enabled the $50K expansion deal.
Supported 100+ customers total through on-call rotations and ad-hoc support. 381 Pylon tickets resolved across the full customer base.
Full outage of remote SDK generation. Ran point as on-call: triaged root cause (ECS failure reading API registry), managed the status page on incident.io, coordinated the fix, de-escalated. Simultaneously juggling other open on-call tickets.
SDK generation producing wrong version numbers — affecting Candid, Humansignal, and other customers. Identified that code I'd written for remote/local parity had a gap, shipped the fix (fern#12872), coordinated testing with teammates while simultaneously in a Cohere customer meeting.
TypeScript SDKs generating empty READMEs after a Docker base image change. Bisected the regression to the specific generator version, confirmed it reproduced in both local and remote modes, spun up Devin to fix, worked through dinner to keep it moving.
Regularly deprioritized planned work to handle urgent customer escalations. Example: pulled off Square SDK work to urgently update Cohere's TypeScript SDK — "Got pulled into updating cohere's ts sdk since they seem to want that urgently. Will be revisiting the square sdk checks passing tomorrow." Weekend catch-up sessions to compensate for on-call interruptions during the week.
Flagged a systemic gap: "What happens when large effort bugs are uncovered from an on-call rotation? Who owns these? Who owns saying to the customer 'We aren't going to support this soon'?" Referenced the SPS Commerce $96k ARR thread as a concrete example. Directly led to Alex formalizing the handoff process.
Noticed the sales eng on-call schedule wasn't active on weekends — customer issues were falling into a void until Monday. Flagged it, Chris agreed "we can't be ignoring things on weekend." Got myself admin access to Pylon and incident.io to design and implement the fix.
Initiated an @here thread in #general-engineering asking what the team's actual practice was around self-approving AI-authored PRs. Created a data-gathering poll (behavior, not opinions). Got substantive responses from Alex, Patrick, Niels, Aditya, Sandeep. Team aligned on "100% confidence = self-approve, otherwise get human eyes."
Proposed implementing internal response time SLAs with incident.io integration so customer alerts don't get lost in Slack noise. Scoped the right questions: do SLAs apply to on-call only or account owners too? What about working hours?
Turned the version number incident into permanent infrastructure: designed and shipped registry version lookups across all SDK languages (npm, PyPI, Maven, NuGet, RubyGems, crates.io, Go proxy) with private registry auth and GitHub release fallback (fern#12905, fiddle#617). Incident → systemic fix.
Fixed Go SSE multiline data field parsing (fern#8604, fern#8630), then proactively flagged: "I think they may be broken in other languages too, but nobody has noticed because most SSE services return data in a single line." Identified a latent bug across the full generator matrix before any customer hit it.
Discovered multi-auth wasn't working for Anduril. Built the integration test fixture (fern#10635), then assigned per-language fix tickets to the right people (Java→Tanmay, Python→Thomas, Go→Patrick). Created the scaffolding for others to fix.
Anduril's self-hosted docs had recurring deployment failures. Summarized the root causes (timeouts, concurrent pod errors, no-downtime breakage), then wrote a prioritized attack plan: shared AWS env → container startup fix → deployment time under 5 minutes → concurrent version errors. Drove deployment time from 10+ minutes to under 5.
Found that a Python generator release broke README generation. Immediately asked: "Should we recall the release versions? Is there a way to only mark the python generator subpackage as recalled?" Thinking about customer impact and rollback strategy, not just the fix.