Senior Software Development Engineer in Test - San Francisco - Weave Bio

Description

Why Weave Exists

At Weave, our mission is to evolve how therapeutic knowledge is captured, transformed, and communicated throughout drug development. We do this by equipping human experts with AI instruments to enable drugs to be brought to patients as rapidly, safely, and inexpensively as possible.

The Weave Platform streamlines regulatory workflows from start to finish by intelligently, creatively, and effectively infusing every step with AI. Together with our customers, Weave is designing and building the AI workbench for the entire therapeutic lifecycle.

The Role & Your Mission

We're looking for a Senior SDET to own the quality infrastructure across all of Weave's products. You'll design, build, and maintain the end-to-end test suite that gives the engineering team confidence to ship fast. This is a true engineering role and you'll treat the test suite as a product with its own architecture, reliability requirements, and users (your fellow engineers).

The bar is high: we want a suite that is fast, deterministic, and trusted. When tests pass, we deploy without hesitation. When they fail, engineers believe it. If you've built and maintained a flake‑free E2E suite at scale and know exactly how hard that is, keep reading.

What You'll Own

Test Architecture & Infrastructure

• Design and build the end-to-end test architecture across all of Weave's products
• Own the full test pyramid strategy, determine what gets tested at which layer and why
• Build shared utilities, fixtures, and abstractions that make writing reliable tests easy for every engineer
• Architect test data management, environment provisioning, and isolation strategies that eliminate flakiness at the source

Suite Reliability & Performance

• Maintain a high‑signal, flake‑free suite, own flake detection, root cause analysis, and systematic elimination
• Optimize execution time so tests remain a fast feedback loop, not a bottleneck
• Build and maintain CI/CD integration so the suite runs on every PR and blocks merges when it should
• Monitor suite health with dashboards and alerting; treat reliability as a metric, not a feeling

Cross-Product Quality

• Partner with product engineering teams to ensure new features ship with comprehensive, maintainable coverage
• Define testing standards and best practices across the organization
• Identify gaps in coverage and prioritize them based on risk and customer impact

What You Bring

Engineering Fundamentals

• 5+ years of professional software engineering experience with a focus on quality, test infrastructure, or a combination of product engineering and test automation
• Proficient in TypeScript. You should be as comfortable in it as any frontend engineer on the team
• Proficient in at least one server‑side language (Python preferred) for tooling, scripting, data seeding, and API‑level testing
• You understand how web applications work end‑to‑end: browsers, networks, APIs, databases, auth flows, and you know where each layer can break

Playwright Expertise

• Expert‑level Playwright knowledge; not just usage, but internals, quirks, and best patterns at scale
• Deep experience with auto‑waiting, selector strategies, network interception, multi‑context testing, and trace debugging
• You've built custom fixtures, reporters, and integrations and have strong opinions on how to structure a large Playwright suite for maintainability

AI‑Augmented Test Engineering

• You actively use AI‑powered development tools (Cursor, Claude, etc.) to accelerate test creation, maintenance, and debugging
• Ideal candidates have direct experience using AI to generate E2E tests from specs or user flows and have developed workflows to keep AI‑generated tests at a high quality bar
• You have the fundamentals to know when a generated test is actually testing what it claims to, and when it's just green by coincidence

Mindset & Approach

• You're pragmatic about coverage; you optimize for confidence‑per‑minute-of‑CI‑time, not a vanity percentage
• You've worked in a fast‑moving startup environment where you had to build testing culture, not just inherit it
• You communicate clearly with product engineers about quality tradeoffs without being a gatekeeper

Bonus

• Experience testing real‑time collaborative features (WebSockets, CRDTs, multiplayer UIs)
• Experience in regulated domains where test traceability and compliance documentation matter
• Contributions to open‑source testing tools or Playwright ecosystem plugins

Why This Role

You'll have the autonomy to build quality systems from the ground up, the scope to work across every product surface, and the mandate to make the test suite something the team genuinely trusts. If you believe a great test suite is an engineering achievement, not a chore, we'd like to talk.

What We Offer

The opportunity to work at a modern, cutting‑edge healthcare technology company devoted to meaningful positive impact on human life. Collaboration, velocity, and customer obsession are our baseline, demonstrations of craftsmanship and ROI are celebrated.

Competitive salary ($175,000 - $215,000) and equity packages.

Comprehensive health, dental and vision insurance

Take care of you and yours: generous PTO, parental leave, OneMedical, TalkSpace, Teladoc.

Career development opportunities within a company entering a growth phase.

Hybrid in San Francisco with in‑office days Tues/Wed/Thurs and flexibility to work remote Mon/Fri.

Equal Opportunity Employer: We are committed to creating a diverse environment and are proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.