Senior Golang Backend Developer - Billing Systems

Aghanim is looking for a Senior Golang Backend Developer to help build and refine backend services that power billing and payment processing systems. This position is based in Lisbon. What You’ll Do Design and develop backend services focused on billing and payment flows Work with Go (Golang) as the primary backend language Integrate with a range of external payment providers and financial APIs Build and maintain systems that manage transactions, retries, reconciliation, and provider communications Implement and optimize billing logic and payment processing pipelines Emphasize reliability, accuracy, and observability in all financial operations Write maintainable, well-tested production code Monitor and troubleshoot payment and transaction workflows About the Role Develop scalable backend services using Golang Integrate seamlessly with multiple payment providers Ensure financial operations are reliable and accurate Handle transaction processing, including error handling and reconciliation Location This role is based in Lisbon.

Join our dynamic team at Aghanim as a Tech Lead/Senior Golang Developer, where you will spearhead the design and development of robust backend services tailored for billing and payment processing systems.This pivotal role demands extensive expertise in Go backend architecture, paired with hands-on experience in integrating with various payment providers and financial infrastructures.You will engage in crafting systems that manage payment processing, billing logic, provider integrations, and transaction workflows, ensuring the utmost reliability, scalability, and accuracy in all financial operations.

Emma Sleep is hiring a Senior Backend Engineer with expertise in Golang to help shape the technology behind its global platform. This position is based in Lisbon and centers on developing and refining backend systems that keep Emma Sleep’s operations running smoothly. Key responsibilities Design, build, and maintain backend services using Golang Improve system performance and scalability Support the reliability and efficiency of Emma Sleep’s technology platform Location This role is located in Lisbon.

Role Overview inetum2 is looking for a Senior Backend Developer (Database Administrator) to join the team in Lisbon. This position focuses on designing, implementing, and maintaining database systems that support reliable and efficient operations. What You Will Do Design and implement database architectures to support backend systems Maintain and optimize databases to ensure strong performance and data integrity Work closely with cross-functional teams to support new features and solutions Location Lisbon

Location: Fully Remote - NYC preferred. Open to US remote or EU remote (Must be able to overlap with EST 6+ hours daily)Employment Type: Full-timeCompensation: $200,000 - $275,000Join an exciting opportunity with our client, a pioneering leader in the blockchain industry, as a Senior Golang Engineer on their core backend team. They have developed an innovative real-time parimutuel prediction market platform on Solana, designed to seamlessly integrate rapid 60-second to 30-minute prediction markets into both livestream environments and web platforms.After successfully raising a $1M pre-seed round in April 2026, led by key venture players in the Solana ecosystem, they are expanding their infrastructure to accommodate high-concurrency traffic patterns. As one of the initial backend engineering hires, you will take ownership of essential systems that facilitate market creation, settlement, and automated payouts during high-stakes global livestream events.Key Responsibilities:System Ownership: Architect, develop, and sustain production-grade, low-latency backend systems capable of managing thousands of concurrent market resolutions.Concurrency & Performance: Implement advanced Go concurrency patterns to handle real-time data flows and high-frequency transaction processing.Infrastructure & Scaling: Oversee and optimize distributed systems, ensuring idempotency, consistent ordering guarantees, and robust failure recovery.Observability: Spearhead production debugging initiatives using logs, metrics, tracing, and profiling to ensure 24/7 system reliability.Technical Autonomy: Operate independently in a dynamic startup environment, influencing the foundational architecture of an emerging product category.

Role overview Riskified seeks a Senior Backend Engineer in Lisbon to help build and maintain the backend systems that power its fraud prevention platform. The position centers on improving efficiency and reliability for clients around the globe. This work supports the technical foundation that enables Riskified’s services to scale and perform. What you will do Design, develop, and maintain backend systems for the core platform Collaborate with cross-functional teams to deliver technical solutions Tackle complex backend challenges to support platform growth and stability Contribute to the adoption and implementation of new technologies Impact Senior Backend Engineers at Riskified influence both product direction and client outcomes. The work directly supports Riskified’s ongoing efforts to lead in fraud prevention and deliver reliable results to customers.

Join our dynamic Platform team as a Senior Python Backend Developer and take charge of the core backend systems that drive Aghanim, a pioneering direct-to-consumer (DTC) platform. Our mission is to empower mobile game developers to effectively monetize their products beyond traditional app stores. As a Merchant of Record, we manage payments, compliance, and tax obligations across over 200 territories while equipping game studios with cutting-edge tools for LiveOps automation, user segmentation, and community interaction.Our platform supports more than 100 live games through customizable Game Hubs (DTC web stores), in-game offers, subscription models, and virtual currency systems — all requiring robust real-money transaction capabilities with a focus on reliability and fraud prevention.You will be working with a sophisticated codebase that adheres to domain-driven design, encompassing over 60 business domains, strict code quality standards, and AI-assisted development processes. Our tech stack includes modern Python frameworks such as FastAPI, SQLAlchemy v2, PostgreSQL, and Redis, facilitating extensive integrations with game backends, payment gateways, and external services.

Join the Tripadvisor Group, where we connect people with unforgettable experiences and strive to be the world's most trusted source for travel and adventure. Utilizing our vast portfolio of travel brands and advanced technology, we aim to engage a global audience and facilitate meaningful connections with our partners across diverse travel categories including accommodations, restaurants, and unique experiences. The Tripadvisor Experiences Engineering team, distributed across Europe, plays a pivotal role in managing Tripadvisor.com and our mobile applications, alongside the supporting infrastructure. We empower operators to grow their businesses while enabling third parties to leverage our comprehensive inventory. Our dedicated team provides essential tools that support our customer service representatives in delivering exceptional service to travelers and operators worldwide. We are in search of a Senior Software Engineer to become part of our dynamic team. This position is available to candidates who can commute (generally within a 2-hour radius) to one of our office hubs in Lisbon. We appreciate flexibility in work arrangements and value the importance of in-person interactions for collaboration and connection. Expect a remote-first work model complemented by periodic office gatherings for team planning and engagement. At Tripadvisor, our engineers thrive on tackling a diverse array of technical challenges. This backend-focused full-stack role primarily involves backend development, with opportunities to engage in frontend projects as well. While a willingness to learn is essential, expertise in frontend development is not required at the outset, as we offer on-the-job training. Our collaborative environment is designed for productivity, where engineers work closely with product managers and designers throughout the entire software development lifecycle—from design and coding to testing and deployment. Most engineers deploy code to production every few days within our daily release cycle. The technology stack at Tripadvisor includes Java, React, Typescript, GraphQL, Kubernetes, SQL, and NoSQL databases on AWS. While strong proficiency in Java is mandatory, familiarity with the entire stack is not a prerequisite; a passion for learning is what we value most. Why Work with Us? Competitive compensation packages, including base salary, annual bonuses, and more. “Work your way” approach offering flexibility to cater to your lifestyle and needs.

payabl seeks a Senior Python Backend Developer to join its SWAT Team. This remote role is based in Lisbon, Portugal. The team works on backend systems that support client requirements and broader business objectives. Key responsibilities Collaborate with cross-functional groups to design and build backend applications in Python. Create features and tools aimed at improving system performance and reliability. Help optimize and integrate backend infrastructure as part of ongoing projects. Location This is a fully remote position located in Lisbon, Portugal.

Join the Kaizen Gaming Family!At Kaizen Gaming, the driving force behind Betano, we stand as one of the largest GameTech companies globally, operating across 19 markets. Our commitment to leveraging state-of-the-art technology empowers us to deliver unparalleled experiences to our millions of valued customers.Our vibrant team of over 2,700 diverse 'Kaizeners', hailing from more than 40 nationalities and spanning three continents, is what sets us apart. We take pride in being recognized among the Best Workplaces in Europe and have earned the prestigious Great Place to Work certification across our offices. Are you ready to Press Play on your potential?About the RoleAs a Senior Backend Engineer, you will be an integral part of a self-sufficient Agile team, collaborating closely with the Product Owner, Agile Delivery Lead, Automation Testers, and fellow Software Engineers to create a competitive edge for Kaizen while delivering a unique online experience to our customers. You will also engage with talented backend professionals within our Backend Chapter.Your Responsibilities Include:As a Senior Software Engineer at Kaizen, you will manage a variety of projects, ranging from our customer-facing websites and mobile applications to our internal tools and backend services, all designed to handle high volumes of traffic.Take full ownership of our applications throughout an engaging development journey.Develop innovative solutions from concept to production.Transform requirements into efficient and sophisticated technological systems, leveraging our large-scale, highly available infrastructure.Design, build, and maintain efficient, reusable, and reliable code.Explore new technologies to discover efficient solutions for everyday challenges.Deliver high-value features swiftly.Challenge existing processes and foster improvement within the team and product.

About the Role Renesas Electronics Corporation is hiring a Senior Backend Software Engineer in Lisbon. This role focuses on designing, building, and maintaining backend systems that support Renesas products. What You'll Do Develop and maintain backend software components Work with cross-functional teams to deliver reliable solutions Contribute to the architecture and performance of core systems Location This position is based in Lisbon.

Gapstars, a Netherlands-based leader in software development services, specializes in creating innovative remote teams in Sri Lanka and Portugal. With over 250 TechStars on board, we transform scalable software into high-performance products that are set to shape the future of technology. We partner with ambitious tech companies eager to dominate their markets.We are seeking a Medior Backend Software Developer to join PFM Intelligence, Europe’s foremost independent movement-data platform. PFM processes real-time footfall and occupancy data for over 7,800 locations in the Netherlands, Belgium, Germany, and the UK, and is evolving into a comprehensive Platform-as-a-Service (PaaS) provider. This role is pivotal to that transformation.In this position, you will focus on developing impactful backend integrations that link PFM’s core platforms and automate essential commercial processes. This hands-on role will allow you to take ownership of significant technical components and directly influence the scalability of our platform.You will collaborate closely with a senior engineer, a backend developer, a cloud migration expert, and an ERP application specialist in a fully remote, highly collaborative environment. Our engineers make technical decisions, and you will have the autonomy to design, build, and refine backend services that operate at scale in production.

About Us:TransPerfect is a renowned leader in the realm of translation software, embodying a lively start-up culture. We are on the lookout for an innovative and enthusiastic Backend Developer to enhance our cutting-edge Artificial Intelligence (AI) team. Join us in shaping the future of AI at a global scale. With over a decade of experience, our AI team has become essential to advancing machine translation, generative AI, natural language processing, and automation.We seek a skilled backend developer who is eager to push technological boundaries and make a significant impact in the AI domain. You will collaborate with a diverse team of professionals across the USA, Spain, Portugal, and India. If you are passionate about creating robust and scalable solutions that bring AI to life for users, this opportunity is for you.About The Role:In this position, you will tackle the complexities of document processing, specifically converting intricate, unstructured PDFs into well-formatted, editable .docx files. Your mission is to not only extract text but to faithfully reproduce the visual and structural intent of the original documents, encompassing nested tables, multi-column layouts, font hierarchies, and styling.Your responsibilities will include:Comparative Analysis: Conduct a thorough evaluation of commercial solutions (ABBYY, Adobe, AWS Textract) versus open-source/AI-native tools (Mistral OCR, Docling, Nougat, LlamaParse).Benchmarking: Develop metrics for “format fidelity” to objectively assess how well a tool recreates headers, footers, tables, and styles.Pipeline Development: Create a Python-based workflow that integrates OCR engines with document generation libraries, such as python-docx or Pandoc.

Join Our Dynamic Team1GLOBAL is at the forefront of global mobile communications, providing innovative connectivity solutions tailored for both enterprises and consumers. Our cutting-edge telecom platform features an extensive in-house developed eSIM technology and a comprehensive array of telecom licenses, allowing us to operate as a fully regulated provider across 40 countries.We proudly serve numerous top-tier clients, including leading banks, enterprises, and digital-first businesses, enabling them to innovate confidently within the mobile ecosystem. With over 70 million connections globally, we empower our customers to launch and scale their telecommunications services effectively.1GLOBAL is a fast-growing, profitable venture with projected revenues exceeding US$200 million and profits surpassing US$25 million in the upcoming years. Our robust cash flow supports continuous investment in infrastructure, technological advancements, and global expansion.Founded in 2022 by industry veterans Hakan Koç and Pyrros Koussios, 1GLOBAL quickly established itself as a European technology leader, driving the future of telecommunications. Operating as a Mobile Virtual Network Operator (MVNO) in 12 countries and a regulated telecom operator in 28 markets, our headquarters in the Netherlands and R&D hubs in Lisbon, Berlin, and São Paulo host a talented team of nearly 500 experts across 15 countries, all dedicated to transforming global mobile connectivity.Be Part of Our Billing TeamAs a key member of our international team, you will play a crucial role in the development and enhancement of 1GLOBAL's billing system. We seek a skilled developer who is a team player, adept at designing and implementing new services, maintaining existing components, and thoroughly testing our applications.Ideal candidates will have a proven track record in bridging product and technology teams within product-led growth organizations. Join us in driving the Mediation and Billing solution's delivery and overseeing the complete life-cycle of our product offerings.

Veeva Systems is a visionary organization dedicated to transforming the life sciences industry. As a trailblazer in industry cloud solutions, we empower life sciences companies to expedite the delivery of therapies to patients. Recognized as one of the fastest-growing SaaS companies in history, we achieved over $2 billion in revenue last fiscal year and are poised for continued growth.Our core values drive us: Doing the Right Thing, Ensuring Customer Success, Fostering Employee Success, and Acting with Speed. In 2021, we made history by becoming a public benefit corporation (PBC), which legally commits us to balancing the interests of our customers, employees, society, and investors.As a Work Anywhere company, we embrace flexible work arrangements that allow you to thrive in your preferred environment, be it at home or in the office.Join our mission to revolutionize the life sciences industry, positively impacting our customers, employees, and communities.The RoleOpenData Clinical serves as the backbone for intelligent clinical operations. The primary challenge in the clinical trials sector is patient recruitment, and delays in this phase can hinder the study timeline, ultimately delaying essential treatments for those in need. Our objective is to streamline this process.By pinpointing the most effective clinical sites, we expedite the journey of bringing drugs to market. We anticipate that OpenData Clinical will save at least one life annually by enhancing clinical operations.In this role, you will develop the core of our data quality engine and pipelines, enabling thousands of curators to manage extensive datasets with accuracy and efficiency, ensuring the life sciences sector has the high-quality data necessary to accelerate clinical trials and drug development.This position is ideal for an engineer who prioritizes architectural integrity over quick fixes. You will thrive in an engineering-driven culture that values technical excellence and affords you the freedom to innovate.

About Us:TransPerfect stands as a premier name in translation technology, blending a dynamic start-up ethos with substantial industry expertise. We are on the lookout for an innovative and enthusiastic Backend Developer to enhance our cutting-edge Artificial Intelligence (AI) division. Within this forward-thinking team, you will have a unique opportunity to influence the trajectory of AI solutions on a global scale. Over the past decade, our AI team has evolved into a pivotal force for innovation, focusing on machine translation, generative AI, natural language processing, and automation.If you are an experienced backend developer eager to explore the frontiers of technology and leave a significant mark in the AI sector, we encourage you to apply. Join our diverse and global team of experts located across the USA, Spain, Portugal, and India. This role is perfect for those passionate about creating robust and scalable AI solutions.About the Role:As a Backend Developer, your main responsibility will be to tackle the final steps of document processing by transforming intricate, unstructured PDFs into well-organized, editable .docx files. Our aim extends beyond mere text extraction; we strive to faithfully recreate the visual and structural intent of the original documents, encompassing nested tables, multi-column layouts, font hierarchies, and styling.You will spearhead the research and development of our document conversion pipeline. This hybrid role requires you to be both a strategic thinker (keeping abreast of existing tools) and a hands-on developer (blending engineering and AI skills).Your key responsibilities will include:Comparative Analysis: Conduct thorough evaluations of commercial solutions (ABBYY, Adobe, AWS Textract) against open-source and AI-native alternatives (Mistral OCR, Docling, Nougat, LlamaParse).Benchmarking: Develop metrics for

About Us:TransPerfect, a prominent name in the translation software industry with an energetic start-up culture, is on the lookout for a talented and enthusiastic Backend Developer to join our dynamic Artificial Intelligence (AI) team. Here, you will have the chance to influence the future of AI within a global organization. With over a decade of experience and the development of initial machine translation models, our AI team has become a cornerstone of innovation in machine translation, generative AI, natural language processing, and automation.We are in search of a skilled backend developer eager to explore the limits of technology and create a meaningful impact in the AI domain. You will collaborate with a diverse and global team of experts based in the USA, Spain, Portugal, and India. If you are driven by a passion for building robust and scalable solutions that extend AI capabilities to users, this position is perfect for you.About the Role:In the role of Backend Developer, you will tackle the "last mile" of document processing: transforming complex, unstructured PDFs into well-formatted, editable .docx files. Your mission extends beyond mere text extraction; you will aim to faithfully reproduce the visual and structural intent of the original documents, including nested tables, multi-column layouts, font hierarchies, and styling.This position requires you to spearhead the research and development of our document conversion pipeline, balancing strategic decision-making with hands-on development (leveraging both engineering and AI skills).Your responsibilities will include:Comparative Analysis: Conduct an in-depth evaluation of commercial solutions (ABBYY, Adobe, AWS Textract) against open-source/AI-native options (Mistral OCR, Docling, Nougat, LlamaParse).Benchmarking: Set metrics for "format fidelity" to objectively assess how well various tools replicate headers, footers, tables, and styles.Pipeline Development: Create a Python-based workflow that integrates OCR engines with document generation libraries (such as python-docx or Pandoc).

Join our dynamic team at Renesas Electronics as a Senior Backend Engineer, specializing in Django or FastAPI. In this role, you will be responsible for developing robust backend systems that support our innovative electronics solutions. We are looking for a passionate engineer who thrives in a collaborative environment and is eager to tackle complex technical challenges.

inetum2 is seeking a Billing & Finance Consultant based in Lisbon. The position centers on refining billing processes and providing support for financial operations throughout the company. Key responsibilities Collaborate with various teams to improve financial workflows and billing procedures Maintain accurate invoicing and ensure timely payment processing Assist with the preparation of financial reports Spot areas where current processes can be improved Take part in broader financial projects and initiatives Requirements Background in finance and billing systems Keen attention to detail Comfort working with colleagues from different departments

About Easyship:Easyship is a premier multi-carrier shipping platform designed to simplify global eCommerce. Since our inception in 2014, we have been dedicated to making logistics accessible and transparent, eliminating the complexities of international shipping. With over 100,000 brands relying on our solution, we provide a centralized hub for global trade, featuring access to more than 550 courier services across 200 destinations.Recognized globally as a leading startup (Forbes 30 Under 30, TechInAsia’s Best Startup), Easyship boasts offices in London, New York, Hong Kong, and more. Our rapid growth is fueled by our commitment to transparency and our passion for creating the infrastructure that drives modern commerce. If you are eager to tackle complex challenges on a large scale, we invite you to join our team.Who We’re Looking For:We seek a Senior Backend Engineer specializing in Ruby on Rails, who is not merely a coder but an architect. The ideal candidate will leverage AI as a powerful tool to enhance the development of high-quality, scalable systems efficiently. You will play a crucial role in our core infrastructure, enhancing our RESTful APIs and optimizing algorithms vital for global trade. Additionally, you will be instrumental in our transition to microservices, ensuring code quality and influencing the technical direction of our backend stack, which includes Ruby on Rails, PostgreSQL, Redis/Sidekiq, RabbitMQ, and Kubernetes. As a mentor, you will guide our team in mastering Ruby and embracing AI-assisted development techniques.