Software Engineer - Internal Tools at Prelude · Paris

About Prelude

Prelude is redefining how companies authenticate and onboard users - turning what's traditionally a cost center into a growth lever.

Our flagship product lets businesses send OTP codes with the best price-to-conversion ratio on the market, dynamically selecting the most effective channel in real time (optimized SMS, WhatsApp, and more) while actively blocking spam and fraud that legacy providers miss.

Founded in 2022 by former Zenly team members who lived the pain of broken SMS authentication firsthand, we're already serving fast-growing companies across Europe and are expanding into the US.

But authentication is only the starting point - we're building the platform for trust at scale, with an ambitious roadmap of market-defining products ahead.

Why join us

Today, we're a team of 60 and growing, based in Paris, building products that power secure and high-performance user onboarding for companies across the world. We believe small, highly skilled teams outperform large, fragmented organizations, and we are intentional about staying focused on impact, quality, and speed.

We operate with a flat org structure and value in-person collaboration, which helps ideas move faster, decisions stay grounded, and teams take full ownership of what they build. Our values

• CareWe care deeply about our customers, our teammates, and the quality and reliability of what we ship.

• Bias for ActionWe move fast, test in the real world, and iterate quickly rather than over-optimizing in theory.

• OwnershipWe take responsibility end to end, from identifying problems to delivering outcomes and learning from results.

About the role

Internal tooling is not a backlog item at Prelude — it's a strategic lever. As we scale from 50 to a much larger team, the speed at which engineering, ops, sales, support, and finance can operate depends on the tools we put in their hands.

You'll own that surface. You'll build the internal tools and AI-powered automation that make every team at Prelude move faster, ship with confidence, and spend their time on the work that actually matters. You'll work directly with internal stakeholders to find friction and turn it into functional, reliable software — and you'll be our edge in AI engineering, evaluating and integrating the tools that define how a modern company operates. Here are some examples of projects :

• Interconnect the various internal tools we use (hubspot, linear, plain and more)
• Optimize the way we calculate and aggregate our billing
• Build flows and use AI to automate our internal processes (invoicing/reporting/support)

This is a high-ownership IC role on the Platform team, with direct access to your internal customers from day one.

What will you be doing?

• Owning the design, development, and maintenance of internal tools used daily across engineering, ops, product, sales, support, and finance
• Building agentic AI workflows that automate repetitive internal processes and unlock new capabilities for our teams (fraud review, customer support triage, GTM workflows, ops dashboards, and more)
• Working directly with stakeholders across all teams to identify friction and turn it into functional solutions, with feedback loops measured in days, not quarters
• Evaluating and integrating the latest AI engineering tools (Claude, Cursor, n8n, Dust, and whatever comes next) and setting the standard for how Prelude leverages them internally
• Contributing to our polyglot codebase and collaborating with the broader engineering team on shared infrastructure, schemas, and APIs
• Designing and building internal dashboards on top of our data layer (DynamoDB, Clickhouse and Postgres) to give every team visibility into what they need to act on
• Participating in on-call rotations for the internal platform you build

What are we looking for?

• Software engineer with experience shipping in high-paced environments and a track record of finishing what you start
• You've shipped automated workflows and AI-powered tools in production (n8n, Dust, custom LLM pipelines, or equivalent), not just prototyped with them
• You've built for internal users before and understand that reliability matters more than polish — but that good UX still earns you adoption
• Solid backend skills in Go or TypeScript, with the ability to design and build reliable APIs and services
• Comfortable working across the stack — React on the frontend when the tool needs a UI, plus the data layer (DynamoDB, SQS, Lambdas) underneath
• A preference for simplicity vs complexity, with intuition for what will scale effectively as the company grows
• A product-led mindset — you code for outcomes and impact, and you can talk to a non-engineer stakeholder without translating from engineer-speak
• Fluent/professional English given our international team

Nice to have

• Experience with developer experience or platform engineering
• Familiarity with fintech, identity, fraud, or another regulated/high-stakes domain
• Experience integrating with common SaaS APIs (CRM, billing, support, data warehouse)
• Any experience with Rust, gRPC, or AWS serverless (Lambda, DynamoDB, SQS) is a plus

Tech stack

• Primary: Go, TypeScript, React
• Codebase and data: Go services, Next.js, gRPC, DynamoDB, SQS, Redshift, Lambdas
• AI tooling: LLMs (Claude and others), agent frameworks, Cursor, n8n, Dust, and whatever comes next

What can we offer you?

• Competitive compensation package with BSPCEs
• 3 days in-office in central Paris, with 2 days WFH; and 4 weeks of remote work per year
• 100% travel to the office subsidised
• Health insurance via Alan
• Urban Sports Club gym membership
• We will provide you with the gear you need for your role (a laptop and a phone, for on-call rotations)
• Swile meal vouchers
• Free snacks and drinks in the office
• An annual offsite in a great location (last one was at La Pradet!)
• The opportunity to build something from 0-1, and make an impact every day

Interview process

• Meet a member of the Talent team
• Technical assessment
• In-person interview (system design, coding)
• Final meeting with CEO

We don't expect you to ace all these stages, we will evaluate your creativity and how you approach difficult problems. You should consider applying even if you don't meet all the criteria.