Senior Ruby (on Rails) Engineer Trust & Safety (f/m/d)

Think security first

• Stay current on how attacks on social platforms evolve: account takeover, fake accounts, romance and marketplace scams, phishing and QR lures, spam rings, coordinated harassment.
• Lead the response when something is spreading or someone is at risk: decide, act, then close the route it came through.
• Decide what we build ourselves and what we buy. Where the market already solves a problem, such as content scanning, evaluate it, buy it and integrate it. Build where the problem is specific to nebenan.

Work as one with Community Management

• Our moderation team handles cases day to day. You build the tooling and the standards they work with, so the highest-risk cases move first and similar cases get similar outcomes.
• Turn what moderation learns into product and platform improvements, and turn platform signals into better moderation decisions.

Keep us compliant, with evidence

• Own the platform-side obligations under the Digital Services Act and GDPR: notice and action, statements of reasons, complaint mechanisms, transparency reporting. Keep the evidence audit-ready as you go. Legal owns the interpretation; you make the platform meet it.
• Measure safety honestly: how much harm actually reaches users, how fast we act, and how accurate our decisions are.

Your profile

• A security-first mindset: you threat-model by instinct, probe how features can be abused, and stay current on attack vectors against social networks
• Solid Ruby on Rails experience in production.
• Strong SQL and a real understanding of how databases behave; you can find an abuse pattern in the data yourself
• A firm grasp of client–server architecture: what the client can and can't be trusted with, where the risk actually lives, and how an API fails under attack
• Infrastructure fluency: AWS, logging, observability, queues. You can reason about a system under attack, not only under load.
• A user- and product-centric view: you care how safety feels in the interface, and you are comfortable shaping frontend features that help users stay safe
• Works well with non-engineers: moderators, product, legal. You can explain a technical risk in plain language and take a moderation insight back into code.
• Judgment under pressure: you keep users' safety and freedom in balance, and you decide quickly when someone may be at risk
• Uses AI deliberately as leverage: directs and reviews generated code to production quality
• Excellent English skills for working in our international team
• If you are not full-stack yet, you want to move into that direction and learn other stacks.
• A plus: German language and German-market moderation context
• A plus: hands-on experience of a fraud, scam or impersonation wave at scale
• A plus: experience selecting and integrating vendor tooling in a safety or security stack
• A plus: a security background in threat modelling, incident response or offensive security

What we offer

• Hybrid work model combining office and remote days
• A meaningful job – we're creating a great product with real added value for the community
• Work in a cheerful and experienced team that exchanges ideas and learns from each other
• Insights into the entire work process of our social startup and the nebenan.de foundation
• Responsibility and great opportunities to actively contribute
• Your nebenan.de SpenditCard – you'll receive an additional income of 35 Euros per month, which you can use for things of your choice
• 30 days of vacation per year – we also offer the possibility of workation models and a sabbatical
• A workplace in Berlin-Kreuzberg and regular events like yoga or Lunch & Learn sessions.

If we’ve captured your interest, apply now and let us know why you’re the perfect fit for the job!

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Source: Statistisches Bundesamt (Destatis), table; dl-de/by-2-0; StarIn's calculation