Senior Software Engineer

Checkatrade; Barcelona; On-site; EUR 80,000 - 120,000; Full time

Benefits offered by this job

Annual bonus

Equity scheme

Health & wellbeing

Job summary

Checkatrade is seeking a Senior Software Engineer in Trust & Safety in Barcelona. You will own systems for verifying tradespeople, processing reviews, and content moderation, shaping a scalable, trustworthy marketplace.

You’ll respond to production incidents, design robust event-driven workflows, and collaborate with vetting and reviews teams to translate trust needs into reliable software. You will work with TypeScript, Fastify/Node.js, and Next.js, with strong emphasis on observability,

Qualifications

• Experience building production-grade TypeScript services end-to-end.
• Strong knowledge of event-driven architectures and idempotent design.
• Proficiency with Next.js for full-stack development.
• Familiarity with Datadog APM/logs and SQL diagnostics.
• Experience leading production incidents and driving fast fixes.

Responsibilities

• Own and evolve the systems behind trades verification, reviews flow, and content moderation.
• Lead incident response: read traces, correlate logs, diagnose root causes.
• Design reliable event-driven workflows with idempotency and dead-letter handling.
• Collaborate with vetting and reviews teams to translate trust requirements into robust systems.
• Improve operational visibility with better monitoring, alerting, and secure data handling.

Skills

TypeScript

Node.js

Event-driven

Next.js

Datadog

SQL

GCP

Incident response

AI tools

Tools

Fastify

Pub/Sub

DLQs

Job description

Powering Great Work

We started as the place to find a trusted trade. Now, as we shape the future of home improvement, we’re building the tech to transform that landscape for everyone - better products, smarter data, AI where it actually helps - so trades can spend less time on admin and consumers can find someone they trust, first time. That’s Powering Great Work, and it’s why every team here exists:

Trades spend less time on admin and more on winning work and growing their business

Homeowners get a trusted trade, first time, every time

We get to build products that change homes and lives across the country

As our next Senior Software Engineer in Trust & Safety, you’ll own the systems that decide how tradespeople are checked, how reviews are processed and how our marketplace stays honest at scale. You’ll work alongside the vetting and reviews teams, who are on the front line of trust, and build the infrastructure that lets them work with confidence. When something breaks in production, you’ll lead the response. When something looks brittle at design time, you’ll say so.

The job, unfiltered:

• Own and evolve the systems behind how tradespeople are verified, how reviews flow through our platform and how content is moderated.

• Lead the response when things break: read distributed traces, correlate logs across services and find the cause, not just the symptom.

• Design event-driven workflows that are reliable by default: idempotent, retryable, with dead-letter handling that doesn’t need a 2am wake-up to unpick.

• Work directly with the vetting and reviews teams to understand what trust means day to day, then build systems that hold up to it.

• Tighten the operational seams: better monitoring, clearer alerting, locked-down auth and outbox patterns that keep data consistent.

The fit:

• Strong TypeScript. You’re comfortable owning a service end to end, from schema to deployment.

• Fastify or a similar Node.js framework, and enough HTTP know-how that it rarely surprises you.

• Event-driven instincts: you know what idempotency means in practice and why the outbox pattern exists.

• Full-stack comfort, Next.js included. You ship the frontend as happily as the service behind it.

• Datadog fluency (APM traces, log search, metric queries), SQL for diagnostics during an incident, and GCP basics such as Pub/Sub backlogs and DLQs.

• Experience leading production incidents, not just being in them. You communicate clearly under pressure and drive to a fix.

• An eye for systemic problems at review time, not at post-mortem time, and a habit of making the people around you better.

• Regular use of AI tools like Cursor or Claude Code, and a keen interest in helping the team get more out of them.

You don’t need to know our Trust & Safety domain yet (the review lifecycle, vetting disposition logic, publish timing). You’ll pick it up. What matters is that you learn fast and take it seriously.

(Don’t self-select out because you don’t tick every box. We’d rather meet you.)

What you get

Competitive salary, annual bonus & equity scheme

Health, wellbeing and learning support

Gym membership, Smart Tech Scheme, Cycle Scheme

Birthday/special day leave, buy & sell holiday scheme

1 week’s paid charity leave, and more

How this goes

• Screening call with one of our Talent Acquisition Partners

• Technical interview with members of the team

• Final stage with the hiring manager and a senior stakeholder

About us

We’re Checkatrade – the UK’s leading platform for finding a tradesperson. With more than 50,000 trades listed and over 6 million reviews, we help homeowners get jobs done right and help tradespeople grow their business.

We’re growing fast, with big plans to become the go-to brand for home improvements. If you care about great work, take pride in the details, and want to make an impact, you’ll fit right in.