TechnologyLocation: Lisbon, Lisbon, PortugalPosted date: 5/13/2025Type: Full-timeAbout Us1 GLOBAL is a technology-driven global mobile communications provider, delivering global connectivity solutions to enterprises and consumers. Powered by a best-in-class telecom platform – including its own owned and operated global mobile core network, fully fledged in-house developed e SIM technology, and an extensive portfolio of telecom licenses – 1 GLOBAL operates as a fully regulated telecommunications provider across 40 countries worldwide.We serve many of the world's leading banks, enterprises, and digital-first businesses, including neo-banks, global fast moving consumer goods companies, travel leaders, and payment service providers. Today, 1 GLOBAL connects more than70 million people and devices globally, enabling our customers to launch, scale, and innovate with confidence in the mobile ecosystem.1 GLOBAL is a profitable, fast-growing business. With full-year revenues in 2025 exceedingUS$200 millionand profits of overUS$25 million, we generate strong cash flows to fund our growth allowing us to continuously invest in infrastructure, platform innovation, and global expansion. Recent years have marked a defining phase in our journey, with major enterprise and mass-consumer client wins accelerating our evolution into a global mobile connectivity powerhouse, purpose-built to enable consumer brands to enter and succeed with their own aspirations to offer telecommunications services to their clients.Founded in 2022 by experienced technology entrepreneurs, Hakan Koçand Pyros Koussios, 1 GLOBAL has rapidly emerged as a European technology leadershaping the future of global telecommunications. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with world‐class R&D hubs in Lisbon, Berlin, and São Paulo, our team of close to500 experts across 15 countriesis united by a single ambition: to redefine global mobile connectivity through technology, scale, and execution excellence.About the TeamYou will be joining a dynamic team at the forefront of developing and maintaining our Network API, x SIM Management System, and Recording Platforms. The Network API powers critical systems and services that enable the creation, configuration, and real‐time monitoring of subscriber configurations across a wide array of business scenarios. These include enterprise solutions, Io T deployments, regulatory compliance, and recording services, ensuring seamless connectivity for everyone and everything. Our x SIM Management System is a high‐performance, low‐latency platform designed to handle hundreds of transactions per second, keeping all x SIMs accurately updated in real time. Meanwhile, our Recording Platforms deliver robust Mobile Compliance & Recording capabilities tailored for financial institutions, automatically capturing client and employee interactions either on‐premises or through our secure cloud infrastructure.We run a multi‐site platform, following strict security requirements, provide the service to customers around the world and manage millions of subscriber profiles. We embrace a highly collaborative and diverse environment, value teamwork, autonomy and hold ourselves accountable for our deliverables and customer success.About the RoleProvide accurate effort estimates to support roadmap planning and effective expectation managementDesign and implement resilient, scalable, secure, and fault‐tolerant architectures to ensure system reliability and performanceDevelop new features and support existing systems across the Network API, x SIM Management System, and Recording PlatformsContribute with small, incremental enhancements that seamlessly integrate into the established codebasesMaintain and update existing solutions to keep them modern, efficient, and reliableCollaborate with team members to ensure smooth development processes and shared understandingWrite and maintain comprehensive tests to ensure fast regression and reliable validation of new featuresImplement procedures and metrics to enable effective monitoring and observability of platform contributionsParticipate in code reviews to promote high standards of code quality, readability, and maintainabilityTake ownership of the quality and outcomes of your work, ensuring fully functional end‐to‐end flowsCreate and maintain accurate, up‐to‐date technical documentationActively contribute to team discussions, with a mindset for continuous improvement and openness to new ideas or technologiesRequirementsAbout YouMust‐haves6+ years of professional experience in backend development, preferably with Go (Golang). Strong Java experience with willing to learn Go is also welcomeStrong understanding of concurrency models, with practical experience in implementing asynchronous workflows, inter‐process communication, and synchronisation techniquesSkilled in designing, building, and consuming RESTful APIs, following best practices for API design and performance optimisationProven experience working with databases, both relational (e.g., Postgre SQL) and non‐relational (e.g., Redis, Mongo DB, Dynamo DB), including data modelling, query optimisation, and performance tuningExperienced in writing unit tests, integration tests, and benchmarks, with a test‐driven development mindsetComfortable with networking protocols and distributed communication patterns (e.g., g RPC, Web Sockets, TCP/UDP)Experienced in building scalable microservices architectures and distributed systemsKnowledgeable in applying software engineering best practices and design patterns for maintainable, testable code.Skilled in using Dev Ops tools and practices, including Docker, CI/CD pipelines, and Infrastructure as CodeFamiliar with Git workflows and collaborative development processes such as pull requests, code reviews, and agile methodologiesDemonstrated accountability for technical outcomes and ownership of end‐to‐end feature deliveryEffective communicator in English, both written and verbal, suitable for a remote and largely asynchronous work environmentNice‐to‐havesProficient in writing idiomatic Go code, with solid understanding of the language's core features such as interfaces, structs, composition, and error handlingCompetent in profiling and performance tuning using Go's built‐in tools such as pprof and trace, with a focus on optimisationDemonstrated experience with event‐driven architectures, including the implementation of producers and consumers using platforms like Kafka, Rabbit MQ, or Active MQSolid hands‐on experience deploying, monitoring, and maintaining applications on KubernetesWorking knowledge of cloud platforms (e.g., AWS, GCP, Azure, Oracle Cloud) with experience deploying cloud‐native applicationsHands‐on experience with observability and monitoring tools like Prometheus and GrafanaExperience with MSML and SIP is a strong plusWhy 1 GLOBAL?Growth Opportunities:Advance your career in one of the fastest growing telecommunications companies, expanding over 100% year‐on‐year under the leadership of successful tech entrepreneurs.Major Transaction Exposure:Be in the driver's seat for transactions that will have an impact on the future telco industry.Work with a Talented Team:From the Board and the Founders to the Senior Management Team, you will collaborate daily with the most capable and renowned external advisors, and constantly being exposed to talented and driven individuals.Dynamic Work Environment:Thrive in a collaborative, fast‐paced workplace where innovation is encouraged, and every contribution counts.Professional Development:Work alongside industry experts to enhance your skills and knowledge in a cutting‐edge field.International Experience:Gain opportunities to work in different 1 GLOBAL offices around the world as you grow within the company.Open Communication Culture:Join a team where your ideas are heard, and open dialogue is encouraged, fostering a supportive and transparent work environment.Get Things Done Attitude:Be part of a results‐driven team that values efficiency, creativity, and the drive to make a tangible impact in the industry.1 GLOBAL is an equal opportunity employer, we value your character as much as your talent. Diversity drives our innovation, and we offer a collaborative, dynamic, and international work environment. We are excited for you to join our mission to revolutionise connectivity globally.No agencies. We do not accept CVs from 3rd parties