SENIOR NODEJS/NESTJS ENGINEER (WITH EXPERIENCE ON FINTECH PROJECTS)

Fintech Core; Wilmington (NC); Remote; USD 140,000 - 180,000; Full time

Benefits offered by this job

Billable days off

Remote work mode

Flexible schedule

Competitive pay

Friendly team

Job summary

Fintech Core is seeking a Senior Backend Engineer (NodeJS/NestJS) to join an outsourced team on a production fintech platform focused on business accounting and financial management. You will extend and improve features, including banking integrations, reconciliation, and analytics, in a distributed, event-driven environment.

The role requires strong TypeScript/Node.js production experience, NestJS, and readiness to work with Kotlin/Spring Boot.

Qualifications

• 5+ years of backend development in production environments.
• Strong knowledge of Node.js and TypeScript in production systems.
• Experience with NestJS and REST API design.
• Readiness to work with Kotlin/Spring Boot in a mixed Kotlin/JS backend ecosystem.
• Strong SQL/data modeling and database performance skills.
• Experience with messaging/event-driven architectures and distributed systems.

Responsibilities

• Develop backend functionality with TypeScript and NestJS within the existing architecture.
• Extend the BFF layer with APIs and business logic for new financial features.
• Design REST APIs contracts using OpenAPI.
• Integrate new functionality without breaking current behavior; improve existing components.
• Support integration between NestJS and Kotlin services and external systems.
• Build and extend integrations with banking providers and accounting systems (e.g., Odoo).
• Develop transaction-processing and reconciliation workflows; handle partial payments, duplicates, retries, concurrency.
• Implement event-driven communication and scheduled/async workflows.
• Ensure data consistency across APIs, services, and analytics.
• Implement tenant-aware authorization and access control.
• Apply idempotency, safe retries, version checks, and proper transaction boundaries.
• Improve observability with logging, metrics, health checks, and alerts.
• Investigate production issues and implement fixes.
• Write clean, testable code with unit/integration tests for financial logic and authorization.
• Participate in code reviews, CI/CD, and API/architecture documentation.
• Take features from analysis to release with BA/PM/QA/client teams.

Skills

Node.js

TypeScript

NestJS

REST APIs

SQL

Event-driven

CI/CD

Git

Testing

Security

Independent work

FinTech

English B2/C1

Tools

PostgreSQL

Docker

Kubernetes

OpenAPI

Keycloak

Cerbos

AWS SQS/SNS

Temporal

Job description

Senior NodeJS/NestJS Engineer (with experience on FinTech projects)

Senior

Full time

Position overview

We’re looking for a Senior Backend Engineer (NodeJS/NestJS) to join an outsourced team working on a financial platform for business accounting and financial management. The product is already in production, so the focus is on extending and improving it, not building from scratch. The upcoming scope covers banking integrations, transaction processing, reconciliation, cash-flow forecasting, accounting automation, and analytics.

You’ll work with a cross-functional team (backend, frontend, QA, BA, PM) and the client’s technical team, who will provide knowledge transfer on the existing architecture. We’re looking for engineers who can quickly get up to speed in an established codebase and take ownership of reliable backend delivery in a complex financial domain.

Project Overview: Financial Management Platform

The platform covers bank account management, transaction and balance imports, cash-flow forecasting, recurring commitments, payment workflows, accounting sync, and reconciliation. It is built on event-driven processing and workflow orchestration. Key technical areas are Kotlin backend services, APIs, async event processing, databases, and integrations with banking and accounting systems.

YOUR BACKGROUND

• 5+ years of backend development, with substantial production experience in TypeScript and Node.js
• Strong knowledge of NestJS
• Readiness to work with Kotlin and Spring Boot: the BFF layer and several services are written in Kotlin
• Strong experience with REST APIs and maintainable service design
• Strong SQL, data modeling, and database performance skills
• Hands-on experience with messaging or event-driven architectures
• Understanding of distributed-systems challenges: idempotency, retries, duplicate messages, concurrency, eventual consistency
• Experience with automated testing, Git, code reviews, and CI/CD
• Understanding of authentication, authorization, and secure handling of sensitive data
• Ability to work independently in an existing, non-trivial codebase
• Experience in FinTech, banking, accounting, or payment systems
• English B2/C1

Skills That Will Be a Plus

• Kotlin and Spring Boot
• Transaction processing, bank reconciliation, ledger integrations, or financial data consistency
• PostgreSQL and transaction management
• AWS SQS/SNS or similar messaging
• Temporal or other workflow orchestration tools
• Multi-tenant applications and tenant-level access control
• Keycloak and Cerbos
• Third-party API integrations, webhooks, and signature verification
• OpenAPI with generated clients
• Docker, Kubernetes, Helm

Nice to have

Odoo or other ERP/accounting systems. Prisma or other ORMs. AWS infrastructure, secrets management, and monitoring. Data warehouses, SQLMesh, or analytical models. Domain experience in forecasting, AP/AR, reconciliation, or accounting automation. Taking over a product from another team.

Responsibilities

• Develop backend functionality with TypeScript and NestJS within the existing architecture
• Extend the Backend-for-Frontend (BFF) layer with APIs and business logic for new financial features
• Design REST APIs contract-first using OpenAPI
• Integrate new functionality without breaking current behavior, and suggest improvements to existing components
• Support integration between NestJS services, Kotlin services, and external systems
• Build and extend integrations with banking providers (account connections, transaction imports, balance sync) and accounting systems, including Odoo
• Develop transaction-processing and reconciliation workflows that handle partial payments, duplicates, retries, and concurrency
• Implement event-driven communication (event contracts, consumers, transactional outbox) and scheduled or async workflows
• Ensure data consistency across APIs, services, and analytics
• Implement tenant-aware authorization and access control
• Apply idempotency, safe retries, version checks, and proper transaction boundaries
• Improve observability through logging, metrics, health checks, and alerts
• Investigate production issues and implement sustainable fixes
• Write clean, testable code with unit, integration, and regression tests, especially for financial logic and authorization
• Participate in code reviews, CI/CD, and documentation of APIs and architecture
• Take features from technical analysis to release, working with the BA, PM, QA, frontend, and client team
• Identify risks and dependencies early and communicate estimates and options clearly

WE OFFER

• 20 billable days off in the first year of cooperation, all next years - 25 billable days off
• Fair and competitive compensation
• Friendly team and enjoyable working environment
• Clearly described business processes in the company that really work
• Regular updates on company news, Q&A sessions with top management
• Flexible work schedule
• Remote work mode
• Ability to transfer unused vacation to the next year