Senior Backend Engineer - Fintech Solution at Lionhires

✨ The Stack take on this Lionhires job

• 🏢 Lionhires has 10 jobs here, 10 with visa sponsorship see all
• 🛂 Visa: EU Blue Card. Salary: At least 1.5 times the national average annual salary (1.2 times in some cases) guide
• 💡 No salary shown. Ask Lionhires if it is above the minimum.

Updated 2026-11-05, from our data and official sources.

Apply with your AI assistant

With The Stack connected to Claude, ChatGPT or Cursor, paste this. Your assistant tailors your CV and cover letter, checks the visa facts and gives you the apply link.

Help me apply to this job on The Stack: https://jobs.trythestack.co/jobs/senior-backend-engineer-fintech-solution-lionhires

Not connected yet? Connect in a minute. To help your user apply, call the MCP tool prepare_application with slug "senior-backend-engineer-fintech-solution-lionhires": it returns the apply link, the visa facts and a CV and cover letter checklist. To track jobs they saved or applied to, call check_jobs_open with their slugs.

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.

Key skills

• Node.js — in 172 other listings on The Stack
• TypeScript — in 467 other listings on The Stack
• Next.js — in 63 other listings on The Stack
• Nest.js — in 6 other listings on The Stack
• MySQL — in 93 other listings on The Stack
• MongoDB — in 57 other listings on The Stack
• Redis — in 122 other listings on The Stack
• REST — in 32 other listings on The Stack
• GraphQL
• WebSockets
• RabbitMQ
• TDD
• Microservices
• Apollo
• Material UI
• Automated Testing

On The Stack (as of 2026-11-05)

• Lionhires has 9 other listings on The Stack, 9 of them marked as offering visa sponsorship.
• 20 visa-sponsored jobs in Portugal on The Stack, posted in the last 60 days.
• 68 visa-sponsored backend engineer jobs in Europe on The Stack, posted in the last 60 days.

Frequently asked questions about Lionhires

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.