Senior Backend Developer

OverviewSenior 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.ResponsibilitiesCollaborate closely with the team on product strategy, assess effort required for features, and make key technical decisionsSupport the overall decision-making process and the company’s sustained growthDevelop, deploy, and maintain new featuresConduct code reviews and facilitate knowledge sharing within the teamWhat you’ll work onCap table engine: Build systems that track ownership across thousands of investors with cent-level precisionMulti-country compliance: Implement investor qualification rules and regulatory workflows across jurisdictionsMulti-asset platform: Extend the platform to support diverse asset classes and investment structuresFinancial operations: Design robust workflows for complex financial transactions and fund operationsReal-time dashboards: Create high-performance investor platform with live portfolio valuationsDocument automation: Generate legal documents (subscription agreements, shareholder reports) from dynamic templatesSecurity: Protect sensitive financial data with robust authentication, authorization, and encryptionTechnical challengesWe handle sensitive financial data, which presents unique challenges:Precision at scale: Engines compute fractional ownership across thousands of investors; rounding errors must cascade correctlyComplex financial state machines: Financial operations involve coordinated updates across multiple entities and ledger entries; state transitions must be atomic and auditableMulti-jurisdiction compliance: Different countries have different regulatory requirements; the system must enforce these rules programmatically while remaining flexibleHistorical reconstruction: Auditors need point-in-time data; architecture supports point-in-time queries tied to specific operationsDomain complexity: Model sophisticated financial instruments and multi-currency valuations with type safetyEngineering cultureDomain-Driven Design: coherent domains with clear boundariesStrict TypeScript: No any types; Zod validation at all boundariesObservability-first: Datadog + OpenTelemetry + Sentry from day oneCode review culture: Every PR gets thoughtful reviewAI-assisted development: We leverage AI tools to augment engineers while keeping humans in the loop for decisionsTechnical stack and focus areasFrontend (context): Next.js (App Router), Tailwind, Shadcn; Apollo Client for GraphQLBackend (your focus): GraphQL Yoga + Nexus; PostgreSQL with Prisma ORM; Redis; BullMQ; Zod; Domain-Driven Design; OpenTelemetry; GCP Cloud RunAPI Layer: GraphQL with type-safe resolvers; REST (admin-facing) with Zod schemasCloud Infrastructure: Google Cloud Platform (Cloud Run, GCS)Observability: OpenTelemetry; Datadog; SentryRequirementsTechnical skills:5+ years building backend TypeScript/Node.js applicationsStrong 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 precisionPlus: Experience with REST API design and OpenAPI/Zod schemasBonus: Experience with fintech, regulatory compliance, or audit trailsMindset: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: Genuine interest in angel investment and the venture capital worldEntrepreneurial mindset: Thrive in fast-paced environments with broad responsibilitiesOwnership mentality: Doer with a bias for action; no task is below youOrganization skills: Ability to prioritize and split tasks efficientlyTeam player: Enjoy sharing and learning from othersInitiative and innovation: Propose improvements and challenge assumptions constructivelyProduct lover: Understand and deliver a strong UX for usersSystems thinking: Ability to rethink the overall modelStrong attention to detail: Code quality matters and you set a high barWhat we offerA front-row seat in a fast-growing startup shaping the future of investment operationsA quality-driven environmentAwesome colleagues with high ambitionsCulture of ownership, collaboration, learning and growthBeautiful offices in central Paris, Toulouse and Luxembourg plus flexible remote optionsCompetitive compensation (including an employee stock options plan)Other perks / terms:Time off: 25 days of holidays + RTT daysHealth insurance: Mutuelle Alan (50% covered by the company)Meals: Swile restaurant card (10€ per workday)Tools: A MacBook is our standard working toolTransportation: Forfait Mobilité Douce (540€/year)Recruitment processFirst interview with our Talent RecruiterSecond interview with Simon, our Founder & CTOCase study with a tech team memberCultural fit with another founderRoundtable 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. #J-18808-Ljbffr