Senior Backend Developer – Services

payabl.

Senior Python Backend Developer focusing on building scalable microservices for fintech company. Responsible for modernizing legacy systems and ensuring backend reliability through Python expertise.

Posted 6/22/2026full-timeLisbon • 🇵🇹 PortugalSeniorWebsite

Tech Stack

Tools & technologies

MicroservicesMySQLPostgresPython

About the role

Key responsibilities & impact

Design, build, and maintain high-performance Python microservices (FastAPI, AsyncIO)
Analyze legacy systems and extract business logic into modern architectures
Refactor and migrate existing modules into clean, scalable, and maintainable services
Ensure system reliability through idempotency, fault tolerance, and robust error handling
Design and integrate external APIs, handling edge cases, retries, and failures
Implement and manage webhooks, callbacks, and complex retry mechanisms
Write high-quality unit and integration tests
Collaborate with cross-functional teams to ensure service stability and performance
Contribute to architectural discussions and continuous system improvements
Take ownership of services end-to-end, from design to production

Requirements

What you’ll need

5+ years of backend development experience with strong Python expertise
Deep knowledge of AsyncIO and FastAPI
Experience building non-blocking, high-reliability microservices
Strong experience with relational databases (MySQL, PostgreSQL)
Solid understanding of API design and third-party integrations
Experience implementing webhooks, callbacks, and retry strategies
Strong testing practices (unit and integration testing)
Ability to work with legacy systems and migrate them into modern architectures
Strong analytical and problem-solving skills
Ownership mindset and ability to work autonomously within a defined architecture

Benefits

Comp & perks

🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account payabl. Website LinkedIn All Job Openings 51 - 200 employees 💳 Fintech 🤝 B2B 💸 Finance Fintech
B2B
Finance payabl. is a fintech company that offers game-changing financial solutions designed to help businesses expand globally. Specializing in a wide range of payment products, payabl. provides services such as card acquiring, banking services, local payment methods, and POS terminals. Their easy-to-integrate payment technology includes features like smart fraud prevention and dedicated customer support, allowing businesses to process local and international payments with ease. Supported by industry experts, payabl. offers over 300 payment methods and cutting-edge fraud protection using AI and machine learning. The company is renowned for its commitment to transparency, real-time bespoke reporting, and personalized customer relationships. Senior Backend Developer – Services 🔥 1 hour ago 🏢🏡 Lisbon – Hybrid ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Microservices MySQL Postgres Python Apply Now Find Hiring Managers Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
Design, build, and maintain high-performance Python microservices (FastAPI, AsyncIO)
Analyze legacy systems and extract business logic into modern architectures
Refactor and migrate existing modules into clean, scalable, and maintainable services
Ensure system reliability through idempotency, fault tolerance, and robust error handling
Design and integrate external APIs, handling edge cases, retries, and failures
Implement and manage webhooks, callbacks, and complex retry mechanisms
Write high-quality unit and integration tests
Collaborate with cross-functional teams to ensure service stability and performance
Contribute to architectural discussions and continuous system improvements
Take ownership of services end-to-end, from design to production 🎯 Requirements
5+ years of backend development experience with strong Python expertise
Deep knowledge of AsyncIO and FastAPI
Experience building non-blocking, high-reliability microservices
Strong experience with relational databases (MySQL, PostgreSQL)
Solid understanding of API design and third-party integrations
Experience implementing webhooks, callbacks, and retry strategies
Strong testing practices (unit and integration testing)
Ability to work with legacy systems and migrate them into modern architectures
Strong analytical and problem-solving skills
Ownership mindset and ability to work autonomously within a defined architecture Apply Now 📊 Check your resume score for this job Improve your chances of getting an interview by checking your resume score before you apply. Check Resume Score Similar Jobs Python Engineer 🕒 2 days ago UMO 51 - 200 📚 Education 🤝 B2B 🧘 Wellness Website LinkedIn All Job Openings Python Engineer designing backend microservices and integrating AI functionalities into a financial platform. Collaborating with cross-functional teams at UMO for robust data processing and secure infrastructure. 🏢🏡 Lisbon – Hybrid ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer AWS Cloud Docker Google Cloud Platform GRPC Microservices NoSQL Postgres Python SQL Software Engineer – Backend 🕒 2 days ago Intapp 1001 - 5000 ☁️ SaaS 💸 Finance 🤖 Artificial Intelligence Website LinkedIn All Job Openings Software Engineer (Backend) developing AI-powered cloud solutions for professional services firms at Intapp. Collaborating with integrated teams to enhance existing software and innovate new products. 🏢🏡 Lisbon – Hybrid 💰 Private Equity Round on 2017-04 ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer ASP.NET AWS Azure Cloud Docker Jenkins Kubernetes Microservices SQL .NET Java Developer – Supervision Platform 🕒 6 days ago Consort Group 1001 - 5000 🤝 B2B 🔒 Cybersecurity 🤖 Artificial Intelligence Website LinkedIn All Job Openings Java Developer contributing to the design and evolution of the Orion platform for non-financial risk management. Collaborating in Agile teams to build scalable backend solutions. 🏢🏡 Lisbon – Hybrid 💵 €28k - €40k / year 💰 Post-IPO Debt - Consort NT on 2018-06 ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer 🗣️🇫🇷 French Required Java Oracle Postgres Spring Spring Boot SpringBoot Java Developer – Supervision Platform 🕒 6 days ago Consort Group 1001 - 5000 🤝 B2B 🔒 Cybersecurity 🤖 Artificial Intelligence Website LinkedIn All Job Openings Java Developer responsible for backend services and API development at Consort Group in Lisbon. Collaborating in Agile teams to design solutions and enhance application performance. 🏢🏡 Lisbon – Hybrid 💵 €35k - €46.5k / year 💰 Post-IPO Debt - Consort NT on 2018-06 ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer 🗣️🇫🇷 French Required Java Backend Developer, AWS 🕒 June 11 Volkswagen Group 10,000+ employees 🚗 Transport Website LinkedIn All Job Openings Backend Developer focused on automotive backend services and cloud infrastructure. Working in a multicultural team at VW Group Digital Solutions in Lisbon, Portugal. 🏢🏡 Lisbon – Hybrid ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer 🗣️🇧🇷🇵🇹 Portuguese Required AWS Cloud Java Kotlin Microservices View More Backend Engineer Jobs 🌐 Worldwide Built by Lior Neu-ner. I'd love to hear your feedback — Get in touch via DM or support@remoterocketship.com Search Search Jobs by country Search jobs by city Search jobs by job title Search entry-level jobs Search junior-level jobs Search senior-level jobs Search jobs by tech stack Search jobs by contract type Search remote internships Search remote part-time jobs Remote jobs Anywhere in the World Companies Hiring Anywhere in the World Companies Hiring Sales People Anywhere in the World Companies Hiring Software Engineers Anywhere in the World Resources Advice Tips for finding remote jobs Interview questions and answers Resume examples Cover letter examples Post a job Affiliates Privacy policy Terms of service Job board SEO course AI Apply Copilot OpenClaw job finder Jobs by Country Remote jobs anywhere in the world (Worldwide remote jobs) Remote jobs United States Remote jobs Australia Remote jobs Brazil Remote jobs Canada Remote jobs France Remote jobs Ireland Remote jobs Germany Remote jobs Netherlands Remote jobs Spain Remote jobs UK Popular Jobs Remote data analyst jobs Remote customer support jobs Remote executive assistant jobs Remote marketing jobs Remote product designer jobs Remote product manager jobs Remote project manager jobs Remote recruiter jobs Remote sales jobs Remote software engineer jobs Jobs by Type Remote full-time jobs Remote part-time jobs Remote contract jobs Remote internship jobs Remote entry-level jobs Remote jobs with no experience required Remote junior jobs (1-3 years of experience) Digital nomad jobs Remote jobs with no degree required Freelance remote jobs Temporary remote jobs Remote jobs hiring now Stay at home mom jobs

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Hard Skills & Tools

PythonFastAPIAsyncIOmicroservicesunit testingintegration testingrelational databasesMySQLPostgreSQLAPI design

Soft Skills

analytical skillsproblem-solving skillsownership mindsetautonomycollaborationcommunication