Contract Senior Software Engineer (C#) at Yld

Location: Portugal, Remote (EU based, GMT timezone) Department: Engineering Employment Type: Contract (B2B) Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be skilled in problem-solving and experienced in designing scalable, resilient, and fault-tolerant architectures. You’re also an effective communicator and a strong team player. Together with your team, you’ll thrive in a fast-paced engineering environment, delivering outstanding results and exciting projects. Your day-to-day responsibilities: • Architecting, designing, building, and delivering highly-available, always-on, zero downtime API products and solutions; • Collaborating with engineers, product owners, and other colleagues to seek exciting and results-oriented problems for delivering value; • Writing clear, maintainable code that will scale; • Contributing to production operation and monitoring of systems and aware of SLAs; • Learning, growing, and mentoring other engineers through code reviews and pair programming to accelerate their technical mastery; • Proactively looking for ways to improve team processes; • Driving good practices within your team, and making an impact on the whole department. Preferred Skills: • Senior-level experience building modern .NET applications using C# (7+), .NET / .NET Core (5+), and NuGet; • Proven experience designing and implementing HTTP APIs using ASP.NET (MVC, Web API) and related frameworks; • Strong background in testing strategies, including TDD, across the full system lifecycle, with a focus on performance optimization. • Solid understanding of system design, including trade-offs in distributed systems, cloud architectures, and event-driven patterns; • Experience working with Platform-as-a-Service (PaaS) cloud environments, ideally Azure; • Familiarity with modern engineering practices such as CI/CD, pairing, and iterative delivery; • Comfortable working in autonomous, agile teams with shared ownership and accountability; • Willingness to participate in a flexible on-call rota, responding to and resolving critical production incidents. • Use AI tools to augment your work, applying sound judgement to adopt emerging technologies where they genuinely add value and increase your impact as an engineer. You should apply if you are: • Self-motivated, proactive and always looking for ways to improve and develop yourself; • A good communicator, both in writing and verbally. You’ll be able to explain technical ideas and concepts in business-friendly language; • Detail-oriented; • Possess strong problem-solving skills that balance innovation with pragmatic technology choices to solve business needs; • Used to working in a team-oriented, collaborative environment; • Analytical and problem-solving-oriented; • A genuine believer in diversity and fairness. What you’ll get in return: • The chance to work with a forward-thinking, ethical, and fun group of people and to develop and grow your skills in a fast-moving business Our typical recruitment process: • 1st Interview with a Talent Partner (30/45 mins) • Technical Interview with our Senior Developers (1h30) • Final chat with our Client Partner (30/45 mins) Get a glimpse of what it's like working at YLD! 🤳 Check out our LinkedIn page We’re an equal-opportunity employer and value diversity in all its forms. We do not discriminate based on race, religion, colour, national origin, gender, sexual orientation, pregnancy or maternity, age, marital status, or disability. We also offer a remote-first working environment, with flexible working and work–life balance as standard for all employees.