Backend Engineer

• Join a product team building payment infrastructure for merchants and partner platforms
• Own end-to-end payment flows in TypeScript/NestJS services, including authorization, capture, void, refund, dispute handling, and payout initiation and confirmation
• Build and maintain acquirer and processor integrations using clean internal abstractions
• Design embedded and hosted checkout experiences, including hosted fields, iframes, and tokenization, to minimize PCI scope
• Implement fee calculation and rate logic, including tiers, interchange-plus, flat structures, rounding rules, special rates, and edge cases
• Build reconciliation and settlement layers matching processor reports and settlement files against internal records
• Design event handling with idempotency keys, out-of-order and duplicate webhooks, retries with backoff, and state machines
• Integrate fraud, bank-account verification, and KYC providers and tune decisioning against real outcomes
• Handle ACH mechanics, including submission windows, returns, return codes, NOCs, and retry rules
• Maintain domain correctness, complete audit trails, and reconciliation evidence
• Act as the team's payments expert, advise product on rail capabilities, and review payment-adjacent code
• Collaborate daily with a US-based team with 4–6 hours of overlap with US Central Time

Senior Backend Engineer – Payments, Go, TypeScript, Node.js

• Take ownership of a business-critical Python platform and help it grow.
• Develop and maintain backend services and APIs using Python and Flask.
• Understand the behaviour of an existing, complex application and build new features without impacting what already works.
• Design and implement asynchronous processing and background job workflows using Celery and RabbitMQ.
• Work with MongoDB and process data using Pandas and NumPy.
• Debug, troubleshoot, and resolve application issues.
• Maintain code quality through automated tests, pull requests, and code reviews.
• Maintain and improve CI/CD pipelines with GitHub Actions.
• Collaborate with product, frontend, and DevOps teams to deliver end-to-end solutions.
• Use GitHub Copilot and other AI tools to work more effectively.
• Fill documentation gaps and contribute to technical best practices.

Senior Python Developer

• Develop, problem-solve, manage, and interact with people while creating intuitive digital products
• Work on innovative projects for companies around the world
• Collaborate with multidisciplinary teams across multiple industries and projects
• Write, refactor, debug, and maintain efficient, testable software
• Build and support back-end systems using Java and Spring technologies
• Work with distributed systems, infrastructure-as-code, CI pipelines, containers, and monitoring tools
• Grow technical skills through challenging projects and mentoring

Senior Java Spring Developer

• Develop software and create intuitive digital products
• Solve problems and manage development tasks
• Engage in human interaction and collaborate with multidisciplinary teams
• Work on innovative projects for companies around the world
• Participate in distributed systems and microservices development
• Build skills across multiple industries and projects

Intermediate Kotlin Back-End Developer

• Develop internal products that power business areas
• Pair with Product Managers and Engineers to define, plan, execute, and prioritize features
• Support the full feature lifecycle from initial design through production monitoring
• Ensure high availability and performance
• Translate high-level business requirements into scalable technical specifications
• Design and implement event-driven architectures and distributed systems
• Create and maintain architectural diagrams and system documentation
• Act as subject matter expert in .NET (C#), PostgreSQL/SQL Server, and REST APIs
• Collaborate with FCamara and client teams across time zones

Mid/Senior .NET Backend Engineer

• Develop software engineering products and services in the Product & Engineering team
• Contribute to Paddle’s payment infrastructure as a Merchant of Record for digital product companies
• Work in a digital-first environment remotely, from company hubs, or through a combination of both
• Collaborate within a transparent, collaborative, and respectful global team
• Engage with new challenges, learning opportunities, and internal and external training

Software Engineer – Go

• Own end-to-end data extraction workflows across complex websites
• Ensure complete coverage, accuracy, and reliable delivery of structured datasets
• Use available tools and custom workflows to accelerate data collection, validation, and task execution
• Extract data reliably from dynamic and interactive web sources, including JavaScript-rendered content
• Adapt scraping approaches to changing site behavior and structures
• Enforce data quality through validation checks, cross-source consistency controls, formatting specifications, and systematic verification
• Scale scraping operations for large datasets using efficient batching or parallelization
• Monitor failures and maintain stability against minor site structure changes
• Use tools such as Apify, OpenRouter, and other technologies for web extraction and processing
• Work independently on specialized data scraping workflows for the Tendem project

Senior Python Data Scraping Engineer

• Design, develop and maintain clean, efficient, secure and well-tested backend code
• Ensure scalability, performance and reliability across Teya's systems
• Own features and projects through scoping, design, development, testing, deployment and maintenance
• Collaborate with product, design, data science, security and operations teams
• Contribute technical insights and architecture discussions
• Build tools and integrate systems to improve operational efficiency, reliability and scalability
• Improve continuous integration, delivery and deployment processes
• Participate in code reviews and elevate team output quality and performance
• Mentor and support fellow developers
• Stay current with software engineering, payments and fintech trends
• Troubleshoot complex issues across systems and provide timely resolutions
• Define and promote best practices in code quality, testing, automation and security
• Serve as a subject matter expert and support other teams

Senior Backend Engineer

• Build high-performance backend services and APIs powering enterprise-grade SaaS applications
• Develop scalable, secure Node.js microservices and Salesforce ecosystem integrations
• Build modern front-end experiences using Vue.js and TypeScript
• Create CI/CD pipeline tooling, automation frameworks, and developer productivity infrastructure
• Implement real-time data processing and event-driven architectures handling sensitive enterprise data at scale
• Work directly with engineering leadership, product managers, and the CEO
• Own significant parts of the architecture and ship production code used by enterprise customers
• Own systems end-to-end and contribute to the company’s growth

Senior Node.js Developer

• Join the Tendem project and drive specialized data scraping workflows for real-world applications
• Own end-to-end data extraction workflows across complex websites
• Deliver accurate, reliable, structured datasets with complete coverage
• Use tools and custom workflows to accelerate data collection, validation, and task execution
• Extract data from dynamic and interactive web sources, including JavaScript-rendered content
• Adapt scraping approaches to changing site behavior and minor site structure changes
• Enforce data quality through validation checks, cross-source consistency controls, formatting specifications, and systematic verification
• Scale scraping operations for large datasets using efficient batching or parallelization
• Monitor failures and maintain scraping stability

Backend Engineer jobs in Portugal