# Senior Backend Engineer - Fintech Solution at Lionhires

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Architect and build high-throughput back

- **Company:** Lionhires (https://jobs.trythestack.co/companies/lionhires)
- **Location:** Portugal
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Node.js, TypeScript, Next.js, Nest.js, MySQL, MongoDB, Redis, REST, GraphQL, WebSockets, RabbitMQ, TDD, Microservices, Apollo, Material UI, Automated Testing
- **Posted by employer:** 2026-06-26
- **Added to The Stack:** 2026-06-29
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://job-boards.eu.greenhouse.io/lionhires/jobs/4647188101 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/senior-backend-engineer-fintech-solution-lionhires

## About the role

Responsibilities:
- Architect and build high-throughput backend services using Node.js and Nest.js.
- Design and scale data storage for high-load workloads (MySQL, MongoDB) and implement Redis caching strategies.
- Develop APIs and realtime layers using REST, GraphQL (Apollo), and WebSockets.
- Design microservices and asynchronous messaging pipelines using RabbitMQ.
- Drive quality through Test-Driven Development and comprehensive automated tests.
- Collaborate with frontend (Next.js, Material UI) and cross-functional teams to deliver end-to-end features.
- Participate in performance tuning, incident response, and capacity planning for payment systems.

Requirements:
- 5+ years commercial web development experience, including 3+ years working with Node.js.
- Expert-level TypeScript skills and practical experience with Next.js, Nest.js, Apollo, and Material UI.
- Strong experience with high-load databases: MySQL and MongoDB; experience with Redis for caching.
- Proven knowledge of API design and realtime protocols (REST, GraphQL, WebSockets).
- Experience with message brokers (RabbitMQ) and building event-driven architectures.
- Solid TDD and automated testing practice.
- Excellent English communication skills.
- Nice to have: prior Fintech/payment domain experience, Kubernetes/container knowledge, and CI/CD exposure.

## Responsibilities

Architect and scale high-throughput payment infrastructure using Node.js and Nest.js. Design robust back-end services, optimize data architecture, and implement real-time communication layers and microservices.

## Requirements

Requires 5+ years of web development experience with at least 3 years in Node.js and expert-level TypeScript proficiency. Must have deep expertise in high-load SQL/NoSQL databases and a strong foundation in microservices and TDD.

## FAQ

- **Is this Senior Backend Engineer - Fintech Solution role still open?** It was posted on 2026-06-26. Listings more than 30 days old may no longer be active, so check Lionhires's site before applying.
- **Does Lionhires offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Lionhires's site.
- **Where is this role located?** The listing gives the location as Portugal. It is marked on-site.
- **What skills does this role ask for?** The listing names: Node.js, TypeScript, Next.js, Nest.js, MySQL, MongoDB, Redis, REST, GraphQL, WebSockets, RabbitMQ, TDD, Microservices, Apollo, Material UI, Automated Testing.

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