Backend Engineer

• Develop, maintain, and enhance backend applications using C# and .NET.
• Build and maintain scalable microservices and REST APIs.
• Implement asynchronous and parallel processing solutions using Task Parallel Library (TPL).
• Develop integrations using messaging technologies such as Kafka, RabbitMQ, Solace, or similar platforms.
• Work with Docker containers and contribute to CI/CD pipelines using GitHub Actions, Azure DevOps, or similar tools.
• Implement logging, monitoring, tracing, and observability best practices.
• Apply SOLID principles, Design Patterns, and Domain-Driven Design (DDD) in software development.
• Collaborate with cross-functional teams to deliver high-quality, reliable software solutions.
• Troubleshoot technical issues, optimize application performance, and contribute to continuous improvement initiatives.

Backend Software Engineer, .NET

• Designing and executing the migration of a large-scale Microsoft SQL Server environment into PostgreSQL architecture.
• Contributing to the transformation of a legacy monolithic database into a distributed PostgreSQL platform.
• Responsible for database migration strategy, schema redesign, performance optimization, and architecture improvements.
• Collaborating with software engineers, architects, and technical stakeholders.
• Exploring and integrating AI-assisted engineering tools into daily workflow to improve productivity.

Senior Database Engineer – PostgreSQL, MS SQL Server

• Develop and maintain modern web applications using **React, Next.js, and TypeScript**;
• Design and implement APIs and backend services using **Node.js**;
• Work with **Supabase**, including PostgreSQL databases, authentication, storage, and server-side functionality;
• Translate product and business requirements into effective technical solutions;
• Participate in technical decisions regarding architecture, integrations, data models, and scalability;
• Integrate internal products with external platforms, services, and APIs;
• Deploy, monitor, and maintain applications using platforms such as **Vercel**;
• Ensure code quality through testing, code reviews, refactoring, and continuous improvement;
• Identify and resolve performance, security, and reliability issues;
• Contribute to CI/CD processes and development best practices;
• Collaborate closely with product, design, and other stakeholders throughout the development lifecycle.

Fullstack Developer – React, Next.js, Node.js

• Development of Java applications and frameworks
• Maintenance and improvement of scripts using Java, SQL, Cucumber and Selenium
• Setup, monitoring and maintenance of CI/CD pipelines using Jenkins
• Monitoring of test execution results and delivery of quality metrics and reports

Java Developer – Mid/Senior

• Join a client project focused on building, integrating, and operating resilient cloud-hosted services.
• Work closely with product, delivery, and engineering teams in an agile environment.
• Help design and deliver services that are secure, scalable, maintainable, and built to SLA standards.

Senior Software Engineer – .NET

• Implement and operationalize core backend services with fault tolerance, security, and scalability.
• Build API-first services integrating blockchain networks, third-party provider solutions, and internal systems with strong consistency guarantees.
• Implement secure service communications using cryptographic signatures, key management, and zero-trust architecture principles.
• Operationalize event-driven systems using Apache Kafka and asynchronous messaging patterns.
• Build highly available, strongly consistent, horizontally scalable services.
• Implement robust concurrent and asynchronous processing patterns for multi-threaded workloads.
• Integrate Web3 SDKs and libraries for on-chain interactions, transaction signing, and state monitoring.
• Implement structured logging, distributed tracing, metrics, and OpenTelemetry instrumentation.
• Produce and maintain high test coverage via automated unit, integration, and functional testing frameworks within CI/CD pipelines.
• Produce and maintain technical documentation, API specifications, and operational runbooks.

Senior Software Engineer, Java

• Design, build, and maintain backend services and APIs (C#/.NET) that power the platform's core business logic.
• Implement and maintain the service layer for asset tracking, facility navigation, and event detection features.
• Integrate with third-party positioning/telemetry providers and their APIs.
• Define and evolve API contracts in collaboration with the frontend team (web admin portal and mobile app).
• Write automated tests, participate in code review, and help keep the codebase maintainable as the platform grows.
• Support deployment, monitoring, and troubleshooting of backend services in production.

• Contributing to a professional-grade trading platform ecosystem — spanning desktop and web trader solutions and order management — where performance, reliability, and low latency are non-negotiable
• Making architecture decisions and explaining them clearly to a distributed international team

Senior .NET Developer – Trading, HFT, Low-Latency

• Join a team building cloud-based, event-driven services
• Work closely with Front-End developers to deliver performant, secure, and resilient solutions
• Take full ownership of your code — from design and development through deployment, monitoring, and production support
• Contribute to an Agile team culture that values testing, documentation, and continuous delivery
• Participate in an on-call schedule as expected

Senior Backend Developer, Node.js, TypeScript

• Design and develop robust, scalable Java applications
• Collaborate with teams to lead software architecture decisions
• Mentor junior developers and facilitate knowledge sharing
• Ensure high performance and responsiveness of applications
• Participate in code reviews and maintain coding standards

Java Developer

• Lead and mentor engineering teams in the development of AI-driven solutions.
• Utilize deep practical experience with various AI models and frameworks to inform design and implementation strategies.
• Design scalable, performant, and secure architectures for AI systems.
• Manage the full lifecycle of AI projects, including conceptualization, deployment, and maintenance.
• Identify and resolve complex technical challenges associated with AI implementation.
• Articulate technical vision and provide clear guidance, fostering collaboration within the team and with stakeholders.
• Remain involved in coding, model development, and the review of technical designs.

AI Tech Lead – Node.js, React

• Build distributed, transactional backend platforms across crypto and fintech
• Design and implement distributed Go services handling high volume transactional workloads
• Run the agentic system that produces the work: context, decomposition, execution, verification
• Operate what you ship. Know its failure modes, watch it, and fix it

Staff Software Engineer, Golang

• Build backend services, APIs and workflows for the AI Neobank app.
• Support products across insurance, payments, wallet, savings, investing, travel and financial services.
• Design reliable systems for user accounts, transactions, partner integrations, reconciliation, notifications and operations.
• Work with product and mobile teams to ship customer-facing journeys quickly.
• Integrate with banks, payment gateways, insurers, data providers and other partners.
• Improve system reliability, observability, security and performance.
• Build systems that are practical, auditable and ready for regulated financial products.

Backend Software Engineer – AI Neobank App

• Build backend services and APIs for onboarding, accounts, payments, cards, transfers, rewards, travel, FX, KYC and risk flows.
• Design reliable systems that can support real customer transactions, operational workflows and future financial products.
• Integrate with internal systems, financial partners, payment providers, AI services and third-party platforms.
• Own backend quality across reliability, security, latency, observability, data integrity and incident handling.
• Work with product, frontend, mobile and AI teams to launch features quickly and safely.
• Improve existing systems by simplifying flows, removing manual work and automating repeatable processes.

Backend Developer

• Building highly scalable microservices in a serverless backend architecture with a continuous delivery pipeline.
• Participate in design sessions to help improve the overall architecture of platform.
• Become well versed in AWS technologies and building a modern event driven serverless architecture.
• Work with stakeholders and product owners to understand requirements and come up with solutions.
• Continuous learning: Tillster provides access to LinkedIn learning courses where you can beef up your skills in different areas as needed.
• Utilizing various application integration techniques to communicate with third party and legacy/back-end systems.
• Help with the development of high-volume, high-performance, high-availability, service-oriented Java or Typescript applications using proven Java or typescript frameworks and technologies.

Software Engineer – Back End

• Design, build, and maintain modern web applications spanning frontend and backend systems
• Contribute to architectural decisions and ensure solutions meet performance, security, reliability, and maintainability standards
• Integrate AI coding assistants into daily workflows
• Use AI for design, implementation, testing, debugging, refactoring, and documentation
• Build guardrails and validation mechanisms to ensure AI-generated code meets production-readiness standards
• Contribute to the team's broader engineering practices for agentic software development

Senior Fullstack AI Applied Engineer – React, Node.js

• Develop and maintain web applications using Java and AEM
• Collaborate with cross-functional teams to deliver high-quality solutions
• Participate in code reviews and contribute to technical architecture decisions
• Mentor junior developers and share best practices

Java AEM Developer

• Design, develop, and maintain scalable backend applications using modern Java (17/21) and the Spring ecosystem
• Own software delivery from architecture and implementation through deployment, monitoring, and production support
• Build and evolve microservices, RESTful APIs, and distributed systems with a focus on performance and reliability
• Participate in solution design, technical decision-making, and architectural discussions across engineering teams
• Diagnose production issues, optimize system performance, and implement robust long-term solutions
• Collaborate closely with product and engineering stakeholders to challenge requirements and deliver high-quality outcomes
• Mentor developers through code reviews, technical guidance, and knowledge sharing
• Contribute to technical hiring and help strengthen engineering standards across the organization
• Leverage AI coding assistants to improve development speed, code quality, and debugging workflows

Senior Java Developer

• Design, build, and maintain backend APIs and microservices supporting Allia’s platform ecosystem.
• Implement event-driven architectures enabling real-time processing and service decoupling.
• Integrate and optimize secure payment systems, preferably Stripe, for digital commerce workflows.
• Collaborate with Principal Engineering, frontend teams, and DevOps to align on architecture and system design.
• Develop CI/CD pipelines and automated testing frameworks to ensure code quality and deployment reliability.
• Monitor performance, troubleshoot system bottlenecks, and improve backend resiliency.
• Participate in code reviews, architectural discussions, and provide mentorship to junior engineers.
• Maintain thorough technical documentation and uphold best practices in security, scalability, and code quality.

Backend Engineer jobs in Portugal

See all jobs on JobTailor

Backend Software Engineer, .NET

Senior Database Engineer – PostgreSQL, MS SQL Server

Fullstack Developer – React, Next.js, Node.js

Java Developer – Mid/Senior

Senior Software Engineer – .NET

Senior Software Engineer, Java

Backend Engineer

Senior .NET Developer – Trading, HFT, Low-Latency

Senior Backend Developer, Node.js, TypeScript

Java Developer

AI Tech Lead – Node.js, React

Staff Software Engineer, Golang

Backend Software Engineer – AI Neobank App

Backend Developer

Software Engineer – Back End

Senior Fullstack AI Applied Engineer – React, Node.js

Java AEM Developer

Senior Java Developer

Senior Java Developer

Senior Backend Developer