Senior Backend Developer – Services

payabl.

Senior Python Backend Developer designing scalable microservices for fintech company payabl. Focus on building reliable systems and modernizing legacy architectures.

Posted 6/22/2026full-timeVilnius • 🇱🇹 LithuaniaSeniorWebsite

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 🏢🏡 Vilnius – 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 Web Scraping Engineer – Python, Mid/Senior 🔥 23 hours ago Oxylabs.io 201 - 500 🔌 API 🔒 Cybersecurity 🛍️ eCommerce Website LinkedIn All Job Openings Web Scraping Engineer developing cutting-edge proxy and web data scraping solutions for global businesses. Involves solving complex challenges and maintaining high traffic infrastructure. 🏢🏡 Vilnius – Hybrid 💵 €3.5k - €6.1k / month ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Docker ElasticSearch Grafana Kubernetes MySQL Prometheus Python Redis Go Senior Python Engineer 🕒 4 days ago SOFTETA 11 - 50 ☁️ SaaS 🏢 Enterprise 🤝 B2B Website LinkedIn All Job Openings Senior Python Engineer joining an agile team to develop backend solutions for a global automotive data platform. Focusing on Python tools and backend services for scalability and performance optimization. 🏢🏡 Vilnius – Hybrid 💵 €5k - €6.6k / month ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Django Flask Postgres Python SQL Senior Java Software Engineer, Core API Unit 🕒 4 days ago Luminor Group 1001 - 5000 Website LinkedIn All Job Openings Senior Software Engineer designing and building robust systems leveraging Java and cloud technologies at Luminor. Engage in Agile practices while collaborating with cross-functional teams to drive innovation. 🏢🏡 Vilnius – Hybrid 💵 €6k - €7k / month ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Apache AWS Cloud Docker Java Kafka Kubernetes Microservices NoSQL SQL Java Software Engineer – Payment Integration 🕒 June 13 Wallee Group 51 - 200 💳 Fintech 🛍️ eCommerce 🛒 Retail Website LinkedIn All Job Openings Java Software Engineer developing payment integration solutions for Wallee Group. Building resilient back-end systems and collaborating with cross-functional teams in a hybrid work environment. 🏢🏡 Vilnius – Hybrid 💵 €4k - €6k / month ⏰ Full Time 🟡 Mid-level 🟠 Senior 🔙 Backend Engineer Apache AWS Distributed Systems Docker Hibernate Java JavaScript Jenkins Spring Spring Boot SpringBoot SQL Senior Backend Engineer, Go 🕒 June 11 Oxylabs.io 201 - 500 🔌 API 🔒 Cybersecurity 🛍️ eCommerce Website LinkedIn All Job Openings Senior Backend Engineer designing backend services for E-Commerce solutions. Working with cutting-edge technology on high-scale web data scraping infrastructure. 🏢🏡 Vilnius – Hybrid 💵 €5.8k / month ⏰ Full Time 🟠 Senior 🔙 Backend Engineer Distributed Systems JavaScript Node.js TypeScript Go 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

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

PythonFastAPIAsyncIOmicroservicesunit testingintegration testingrelational databasesMySQLPostgreSQLAPI design

Soft Skills

analytical skillsproblem-solving skillsownership mindsetautonomycollaborationcommunication