Senior Security – QA Lead

Job not on LinkedIn

🔥 0 minutes ago

🇧🇷 Brazil – Remote

⏰ Full Time

🟠 Senior

🔧 QA Engineer (Quality Assurance)

👻 Ghost score 18%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Ubiminds

WebsiteLinkedInAll Job Openings

51 - 200 employees

💼 Consulting

📦 Logistics

📣 Marketing

Consulting • Logistics • Marketing

Ubiminds is a company that delivers custom-curated digital product teams through staff augmentation and employer-of-record services based in Brazil. The company specializes in hiring and recruiting top Latin American talent, particularly in software engineering and various programming languages including Python, Java, C#, and JavaScript. Ubiminds focuses on empowering Latin American professionals to create significant careers and products within American tech companies.

📋 Description

• Design and lead adversarial security testing of the deterministic decision path • Attempt to defeat default-DENY, escalate privileges, or cross tenant boundaries, and prove that the boundaries hold • Test multi-tenant isolation and owner-versus-customer scoping through the platform’s roster subsystem using real tenant-scoped identities • Verify the tamper-resistance of the hash-chained audit trail, including append-only behavior, hash-chain linkage, and detection of attempted mutation • Validate authentication and authorization across tenant and operator roles • Review and extend the existing per-module freeze-audit self-tests • Ensure every governance rule resolves through the live intake path to a real engine record • Rank findings by severity and provide clear reproduction steps in GitHub Issues • Keep findings in the same line of sight as the freeze-audit CI gate • Uphold the merge gate: nothing lands unless freeze-audit CI is green • Partner with the client on architectural sign-off for governance-core changes • Report to the Ubiminds Engagement Manager • Deliver a documented adversarial test suite, independent audit-chain verification, severity-ranked findings, and a clean green-CI defect flow within the first 12 weeks

🎯 Requirements

• Strong security-testing background, including penetration testing, authorization/access-control testing, or security QA against systems where boundary failure is the primary risk • Hands-on experience with Python and comfort reading a real codebase to design tests against it • Experience with multi-tenant SaaS and practical understanding of tenant isolation failure modes • Practical understanding of cryptographic audit trails / hash chaining and how tamper-evidence is proven • Experience with Docker and CI-based workflows, including GitHub Actions or equivalent • Ability to work against a green-CI merge gate • Proficiency with Postgres for validating durable state and persistence • Clear written English • Strong ability to produce rigorous, reproducible defect reports • Experience testing policy engines, authorization systems, or agentic-AI guardrails • Exposure to SOC 2 controls and evidence expectations • Familiarity with Render or comparable container hosting • Background working in a regulated or safety-critical domain

🏖️ Benefits

• Placed in a product-based company and treated like a full-time team member • Full back-office support: career guidance, HR, and concierge services • Remote-first policy • Company-provided MacBook (no BYOD) • Tech talks, chapter meetings, and access to a strong community of top engineers • Free English lessons with a native English speaker • Referral bonus for recommending new Ubiminders • Access to the Florianópolis HQ with snacks, massages, drinks, and games