Penetration Tester

Antler; Stockholms kommun; On-site; SEK 600,000 - 800,000; Full time

Job summary

Antler is looking for a Penetration Tester based in Stockholm to own and execute penetration tests across web platforms and cloud infrastructure. The ideal candidate has over 5 years of experience in offensive security techniques and a strong understanding of AI-native products.

This role involves stress-testing user-generated code and collaborating with engineering to remediate security findings, ensuring Lovable's platform remains secure as it scales.

Qualifications

• 5+ years of hands-on penetration testing experience across web, mobile, APIs, and cloud infrastructure.
• Deep expertise in offensive security techniques: OWASP, MITRE ATT&CK, exploit development.
• Experience attacking AI-native products or LLM-integrated systems.
• Strong understanding of cloud environments (GCP, AWS, Cloudflare).

Responsibilities

• Own offensive security end-to-end: plan and execute penetration tests.
• Probe LLM integrations for prompt injection and data leakage.
• Identify systemic vulnerabilities in user-generated code.
• Collaborate with engineering to remediate and verify fixes.
• Run internal red team exercises and contribute to threat modeling.

Skills

Penetration testing

Offensive security techniques

Cloud environments understanding

Translating findings into reports

Collaboration and competition

Tools

SAST/DAST tooling

Job description

Location

Stockholm

Employment Type

Full time

Location Type

On-site

Department

Engineering Security

TL;DR: We're looking for a Penetration Tester who lives to break things, ethically. You'll push Lovable's platform to its limits, hunt vulnerabilities across our AI pipelines and user‑generated code, and make sure attackers never get there before you do.

Why Lovable?

Lovable lets anyone and everyone build software with any language. From solopreneurs to Fortune 100 teams, millions of people use Lovable to transform raw ideas into real products – fast. We are at the forefront of a foundational shift in software creation, which means you have an unprecedented opportunity to change the way the digital world works. Over 2 million people in 200+ countries already use Lovable to launch businesses, automate work, and bring their ideas to life. And we’re just getting started.

We’re a small, talent‑dense team building a generation‑defining company from Stockholm. We value extreme ownership, high velocity, and low‑ego collaboration. We seek out people who care deeply, ship fast, and are eager to make a dent in the world.

What we’re looking for

• 5+ years of hands‑on penetration testing experience across web, mobile, APIs, and cloud infrastructure.

• Deep expertise in offensive security techniques: OWASP, MITRE ATT&CK, exploit development, privilege escalation, and lateral movement.

• Experience attacking AI‑native products or LLM‑integrated systems, including prompt injection, model abuse, and data exfiltration vectors.

• Strong understanding of cloud environments (GCP, AWS, Cloudflare) and the attack surfaces they introduce.

• Ability to translate complex findings into clear, prioritised reports that engineering teams can act on immediately.

• Low ego, high output. You collaborate as naturally as you compete against systems.

• Bonus: experience with red team operations, supply chain attacks, or mobile security (iOS/Android). Familiarity with SAST/DAST tooling. Background in security research or CVE disclosure.

What you’ll do

• Own offensive security end‑to‑end: plan and execute penetration tests across Lovable's web platform, mobile surface, APIs, cloud infrastructure, and AI pipelines.

• Break our AI before others do: probe LLM integrations for prompt injection, jailbreaks, data leakage, and novel attack vectors unique to AI‑generated code running in live products.

• Stress‑test user‑generated code at scale: identify systemic vulnerabilities introduced when millions of users create and deploy real applications on Lovable.

• Turn findings into action: work directly with engineering to prioritise, remediate, and verify fixes, closing the loop between discovery and resolution.

• Raise the security bar org‑wide: run internal red team exercises, contribute to threat modelling, and embed an attacker's mindset across the engineering culture.

• Help make Lovable the most secure AI product in the market.

Our Tech Stack

• Frontend: React and TypeScript

• Backend: Golang and Rust

• Cloud: Cloudflare, GCP, AWS, Modal, multiple LLM providers

• DevOps & Tooling: GitHub Actions, Grafana, OTEL, infra‑as‑code (Terraform)

• Data: Clickhouse, Firestore, Spanner, BigQuery

And we're always exploring what's next!

We treat all candidates equally.