Senior Backend Developer - Toulouse (M/F)

Roundtable; Toulouse; On-site; EUR 55,000 - 75,000; Full time

Benefits offered by this job

25 days of holidays + RTT days

Health insurance (50% covered by the company)

Meals - Swile restaurant card (10€ per workday)

Tools - A MacBook as a standard working tool

Transportation allowance (540€/year)

Job summary

A dynamic tech startup in Toulouse is seeking a Senior Backend Developer to join their tech team. You will be responsible for developing and maintaining backend systems, working closely with colleagues on product strategy and technical decisions. The ideal candidate has over 5 years of experience in backend development using TypeScript, a strong grasp of PostgreSQL, and proficiency in GraphQL. The role offers an engaging, fast-paced environment with opportunities for collaboration and innovation.

Qualifications

• 5+ years building backend TypeScript/Node.js applications.
• Strong experience with PostgreSQL and ORMs.
• Proficiency with GraphQL server development.

Responsibilities

• Collaborate closely with the team on product strategy.
• Develop, deploy, and maintain new features.
• Conduct code reviews and facilitate knowledge sharing.

Skills

Building backend TypeScript/Node.js applications

PostgreSQL and ORMs (Prisma preferred)

GraphQL server development

Job queues and async processing

Understanding financial calculations

Job description

Overview

Senior Backend Developer needed to join our tech team. We are building a platform that offers an opportunity to co-invest in the Private Equity sector and are focused on establishing a premium brand and platform. As our tech team scales, you’ll wear many hats and collaborate across departments.

Responsibilities

• Collaborate closely with the team on product strategy, assess effort required for features, and make key technical decisions
• Support the overall decision-making process and the company’s sustained growth
• Develop, deploy, and maintain new features
• Conduct code reviews and facilitate knowledge sharing within the team

What you’ll work on

• Cap table engine: Build systems that track ownership across thousands of investors with cent-level precision
• Multi-country compliance: Implement investor qualification rules and regulatory workflows across jurisdictions
• Multi-asset platform: Extend the platform to support diverse asset classes and investment structures
• Financial operations: Design robust workflows for complex financial transactions and fund operations
• Real-time dashboards: Create high-performance investor platform with live portfolio valuations
• Document automation: Generate legal documents (subscription agreements, shareholder reports) from dynamic templates
• Security: Protect sensitive financial data with robust authentication, authorization, and encryption

Technical challenges

We handle sensitive financial data, which presents unique challenges:

• Precision at scale: Engines compute fractional ownership across thousands of investors; rounding errors must cascade correctly
• 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 point-in-time data; architecture supports point-in-time queries tied to specific operations
• Domain complexity: Model sophisticated financial instruments and multi-currency valuations with type safety

Engineering culture

• Domain-Driven Design: coherent domains with clear boundaries
• Strict TypeScript: No any types; Zod validation at all boundaries
• Observability-first: Datadog + OpenTelemetry + Sentry from day one
• Code review culture: Every PR gets thoughtful review
• AI-assisted development: We leverage AI tools to augment engineers while keeping humans in the loop for decisions

Technical stack and focus areas

Frontend (context): Next.js (App Router), Tailwind, Shadcn; Apollo Client for GraphQL

Backend (your focus): GraphQL Yoga + Nexus; PostgreSQL with Prisma ORM; Redis; BullMQ; Zod; Domain-Driven Design; OpenTelemetry; GCP Cloud Run

API Layer: GraphQL with type-safe resolvers; REST (admin-facing) with Zod schemas

Cloud Infrastructure: Google Cloud Platform (Cloud Run, GCS)

Observability: OpenTelemetry; Datadog; Sentry

Requirements

Technical skills:

• 5+ years building backend TypeScript/Node.js applications
• Strong experience with PostgreSQL and ORMs (Prisma preferred)
• Proficiency with GraphQL server development (Yoga, Nexus, or similar)
• Experience with job queues and async processing (BullMQ, Redis)
• Understanding of financial calculations and decimal precision
• Plus: Experience with REST API design and OpenAPI/Zod schemas
• Bonus: Experience with fintech, regulatory compliance, or audit trails

Mindset:

• You care about correctness; bugs in financial systems have real consequences
• You enjoy domain complexity and learning new business concepts
• You prefer clean architecture over quick hacks
• You communicate clearly with non-technical stakeholders

Interest: Genuine interest in angel investment and the venture capital world

Entrepreneurial mindset: Thrive in fast-paced environments with broad responsibilities

Ownership mentality: Doer with a bias for action; no task is below you

Organization skills: Ability to prioritize and split tasks efficiently

Team player: Enjoy sharing and learning from others

Initiative and innovation: Propose improvements and challenge assumptions constructively

Product lover: Understand and deliver a strong UX for users

Systems thinking: Ability to rethink the overall model

Strong attention to detail: Code quality matters and you set a high bar

What we offer

• A front-row seat in a fast-growing startup shaping the future of investment operations

• A quality-driven environment

• Awesome colleagues with high ambitions

• Culture of ownership, collaboration, learning and growth

• Beautiful offices in central Paris, Toulouse and Luxembourg plus flexible remote options

• Competitive compensation (including an employee stock options plan)

• Other perks / terms:

  • Time off: 25 days of holidays + RTT days
  • Health insurance: Mutuelle Alan (50% covered by the company)
  • Meals: Swile restaurant card (10€ per workday)
  • Tools: A MacBook is our standard working tool
  • Transportation: Forfait Mobilité Douce (540€/year)

Recruitment process

• First interview with our Talent Recruiter
• Second interview with Simon, our Founder & CTO
• Case study with a tech team member
• Cultural fit with another founder

Roundtable is committed to creating a diverse environment. All qualified applicants receive consideration for employment irrespective of gender, origins, identity, background, and orientations. We encourage all applicants, especially those from underrepresented groups, to apply. Diversity, equity and inclusion are fundamental pillars.