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Talent Network: Senior Backend Engineer (Node.js)

2 hours, 43 minutes ago
Europe
Full-time
Senior
Backend Engineer
Software Development
Datadog GraphQL NestJS Node.js PostgreSQL Solana Swift TDD TypeScript
Apply Now
Toptal

Toptal

Toptal is a curated talent marketplace connecting freelance software developers, designers, finance experts, product managers, and project managers with businesses globally. With a focus on top 3% talent in software engineering, design, and finance, To...

Construction & Engineering
5K-10K
Founded 2010
$4M raised
View All Jobs 25

Description

  • Build and scale backend features across banking, cards, crypto, and compliance modules.
  • Design and implement durable Temporal workflows for critical financial operations.
  • Improve webhook reliability using inbox patterns, signature verification, and IP whitelisting.
  • Evolve the event-driven architecture and maintain idempotent, crash-resilient workflows.
  • Own observability and incident response for payment and transaction flows.
  • Use AI-assisted engineering tools daily as part of the standard development workflow.
  • Apply codified engineering standards through architecture decisions, ADRs, and module-level documentation.
  • Follow test-driven development practices and quality gates for linting, typechecking, and test execution.

Requirements

  • Strong experience with TypeScript and Node.js, with NestJS preferred.
  • Hands-on PostgreSQL experience including schema design, transactions, advisory locks, and performance tuning.
  • Experience designing GraphQL APIs with Apollo Server, resolvers, custom scalars, and pagination.
  • Experience with event-driven architecture, including outbox/inbox patterns, idempotency, and at-least-once delivery.
  • Experience with Temporal.io or a similar durable workflow engine such as Cadence or AWS Step Functions.
  • Ability to design idempotent activities, deterministic workflows, and robust failure handling in distributed systems.
  • Familiarity with payment rails such as ACH, SWIFT, and Fedwire, or willingness to learn quickly.
  • Understanding of double-entry accounting concepts, webhook signature verification, and KYC/KYB compliance flows.
  • Experience with Solana, stablecoin mechanics, wallet custody models, and KMS-backed cryptographic signing.
  • Proficiency using AI coding assistants such as Claude Code, Cursor, or Copilot as a daily development tool.
  • Experience with observability and operations tooling such as Datadog, Sentry, and structured logging.
  • Remote position with no visa sponsorship or visa assistance; resumes and communication must be in English.
  • Nice to have experience with Privy, Sumsub, Noah, or Rain APIs, AWS KMS or HSM-backed signing, PostgreSQL logical replication, and large-scale NestJS module architecture.

Benefits

  • Remote-first position.
  • Full-time employment.
  • Opportunity to work on a fintech product built on stablecoin rails.
  • Daily use of AI-assisted engineering tooling as part of the workflow.
  • Work on a modern backend stack spanning banking, blockchain, and card infrastructure.

Interested in this position?

Apply directly on the company website

Apply Now

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