Senior Full-stack Developer

Roundtable; Paris (TX); Hybrid; USD 124,000 - 202,000; Full time

Benefits offered by this job

Health insurance

Restaurant card

MacBook provided

25 days holiday

RTT days

Mobility stipend

Job summary

Roundtable in Paris is seeking a Senior Full-Stack Developer to join the tech team and help build a platform for co-investment in Private Equity. You’ll own end-to-end features from planning to production, collaborate across departments, ensure precision in financial calculations, and contribute to a scalable, type-safe architecture using a TS stack with PostgreSQL and Prisma.

The role emphasizes accuracy, regulatory awareness, and delivering robust workflows for cap table management and

Qualifications

• 5+ years building full-stack TypeScript applications.
• Comfortable with PostgreSQL and ORMs (Prisma preferred).
• Understanding of financial calculations and decimal precision.
• Experience in fintech, regulatory compliance, or cap table management.
• Strong attention to detail and code quality.

Responsibilities

• Collaborating on product strategy, assessing feature effort, and making technical decisions.
• Support decision-making processes and company growth.
• Developing, deploying, and maintaining new features.
• Conducting code reviews and promoting knowledge sharing within the team.

Skills

Full-stack TypeScript

PostgreSQL

ORMs (Prisma preferred)

Decimal precision

Regulatory compliance

Cap table management

Tools

Prisma

Job description

About the role

We are looking for a highly skilled Senior Full-Stack Developer to join our tech team.

As collaborative building is at the core of how we operate - not just within the engineering team but across all departments. We are developing a platform that offers an incredible opportunity to co-invest in the Private Equity sector. To achieve our vision, we need to establish both a premium brand and platform.

As our tech team continues to scale, you’ll wear many hats. Your responsibilities will include:

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  Collaborating closely with the team on product strategy, assessing the effort required for various features, and making key technical decisions

  
  


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  Supporting the overall decision-making process and the company’s sustained growth

  
  


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  Developing, deploying, and maintaining new features

  
  


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  Conducting code reviews and facilitating knowledge sharing within the team

  
  

What you’ll work on

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  Cap table engine: Build systems that track ownership across thousands of investors with cent-level precision

  
  


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  Multi-country compliance: Implement investor qualification rules and regulatory workflows across jurisdictions

  
  


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  Multi-asset platform: Extend the platform to support diverse asset classes and investment structures

  
  


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  Financial operations: Design robust workflows for complex financial transactions and fund operations

  
  


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  Real-time dashboards: Create high-performance investor platform with live portfolio valuations

  
  


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  Document automation: Generate legal documents (subscription agreements, shareholder reports) from dynamic templates

  
  


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  Security: Protect sensitive financial data with robust authentication, authorization, and encryption

  
  

Technical challenges

Precision at scale: Our engines compute fractional ownership across thousands of investors. Rounding errors must cascade correctly - we can’t lose or create cents.

Complex financial state machines: Financial operations involve coordinated updates across multiple entities and ledger entries. State transitions must be atomic and auditable.

Multi-jurisdiction compliance: Different countries have different regulatory requirements. The system must enforce these rules programmatically while remaining flexible.

Historical reconstruction: Auditors need to see data at any point in time. Our architecture supports point-in-time queries tied to specific operations.

Domain complexity: We model sophisticated financial instruments and multi-currency valuations all with type safety.

Overall tech stack

Type Safety: 100% TypeScript across the entire stack (frontend, backend, shared libraries)

Quality Assurance:

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  Vitest for unit/integration testing

  
  


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  Playwright for E2E testing

  
  


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  Biome for linting and formatting

  
  


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  Zod for runtime validation at all system boundaries

  
  

Architecture:

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  pnpm workspace monorepo with Turborepo for build orchestration

  
  


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  Domain-Driven Design with 20+ shared domain libraries

  
  

Application Layer:

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  Frontend: Next.js (App Router), Tailwind, Shadcn

  
  


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  Backend: TRPC + Nexus (type-safe schema generation)

  
  


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  Database: PostgreSQL & Redis

  
  


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  Job Queue: BullMQ with Redis

  
  


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  Design System: Figma & Storybook

  
  

API Layer:

• REST (admin-facing) with Zod schemas via lib/api-schemas

Cloud Infrastructure:

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  Google Cloud Platform (Cloud Run, GCS)

  
  


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  Container-based deployments

  
  

Observability:

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  OpenTelemetry for distributed tracing

  
  


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  Datadog for monitoring (browser + server)

  
  


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  Sentry for error tracking

  
  

AI Integration: OpenAnthropic-powered document analysis and data extraction pipelines

Engineering culture

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  Domain-Driven Design: coherent domains with clear boundaries

  
  


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  Strict TypeScript: No any types, Zod validation at all boundaries

  
  


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  Observability-first: Datadog + OpenTelemetry + Sentry from day one

  
  


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  Code review culture: Every PR gets thoughtful review

  
  


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  AI-assisted development: We leverage AI tools (IDE assistants, PR review) to augment engineers while keeping humans in the loop for all decisions

  
  

You’re a great match ifTechnical skills:5+ years building full-stack TypeScript applicationsComfortable with PostgreSQL and ORMs (Prisma preferred)Understanding of financial calculations and decimal precisionBonus: Experience with fintech, regulatory compliance, or cap table managementMindset:You care about correctness-bugs in financial systems have real consequencesYou enjoy domain complexity and learning new business conceptsYou prefer clean architecture over quick hacksYou communicate clearly with non-technical stakeholdersInterest: You have a genuine interest in angel investment and the venture capital worldEntrepreneurial mindset: You thrive in fast-paced environments where you have broad responsibilitiesOwnership mentality: You are a doer and have a bias for action, no task is below youOrganization skills: You know how to prioritize and split your tasks efficientlyTeam player: You enjoy sharing and learning from each otherInitiative and innovation: You propose improvements and challenge assumptions constructivelyProduct lover: You fully understand what we want to bring to our users, and you are eager to deliver the best possible UX to themSystems thinking: You are able to step back and rethink our model globallyStrong attention to details: Code quality is important for you and you set a high barWhat we offerA front-row seat in a fast-growing startup shaping the future of investment operations - ranked 14th in the Sifted 250, which highlights Europe’s 250 startups with the highest percentage revenue growth over the past three yearsA quality-driven environmentAwesome colleagues with high ambitionsA culture of ownership, collaboration, learning and growthBeautiful offices in central Paris, Toulouse and Luxembourg + flexible remote options for people in other countriesCompetitive compensation (including an employee stock options plan)Other perks / terms and conditions :Time off: 25 days of holidays + RTT daysHealth insurance: Mutuelle Alan (50% covered by the company)Meals: A restaurant card with our partner Swile (10€ per workday)Tools: A MacBook is our standard working toolTransportation: Forfait Mobilité Douce (600€ /year)