Senior Ruby (on Rails) Engineer Trust & Safety (fmd)

connects real neighbours under their real names. That only works if people feel safe here. Your mission is to keep our users safe: with technical safeguards built into our platform and API with product features that help neighbours protect themselves and in close partnership with our Community Management team.

Concretely you will:

• You will be the first hire in a new team of three safeguarding our users. Becoming a team lead is an option.

• Design and implement technical safeguards in our API and backend: abuse detection rate limiting verification checks and the signals that catch fake accounts and scams early.

• Ship user-facing safety features. Reporting flows warnings on suspicious messages blocking and privacy controls safer defaults. Safety that users can see and use.

• Threat-model new features before they ship. Ask how a bad actor would abuse them and design the friction and detection against it.

• Assess and implement third party integrations to improve our way of working with threats.

• 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.

• 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.

• 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 clientserver architecture: what the client can and cant 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

• Hybrid work model combining office and remote days

• A meaningful job were 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 foundation

• Responsibility and great opportunities to actively contribute

• Your SpenditCard youll 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 weve captured your interestapply now and let us know why youre the perfect fit for the job!