Senior Fullstack .NET Engineer (SDLC x AI)

Job Description

🚀 We’re Growing Our Development Dream Team!

Titles? Meh, we’re not big on them, but let’s call this one Senior Software Engineer 😉

As part of our Development squad, you’ll craft tailor-made solutions that wow our clients. We’re looking for a passionate Senior Software Engineer (.NET & Azure) who combines deep technical expertise with a modern engineering mindset, leveraging AI‑assisted development tools to accelerate delivery without compromising excellence. Your mission? Train, deploy, and put groundbreaking developments into action — and that’s just the beginning.

Here’s the deal:

• You’ll tackle the unique challenges of software development with best practices alongside a team of brilliant minds.
• You’ll dive into cutting-edge projects using the latest tech to push boundaries and make an impact.
• Whether you prefer working from home or vibing with us at our offices, the choice is yours.
• AGILE isn’t just a buzzword here — it’s how we roll. Multidisciplinary teams? Check. Full ownership of projects? Double check.

Ready to take on projects that matter, with a team that’s as passionate as you are? Let’s make it happen! 😊

You will be responsible for:

• Design and lead end-to-end software engineering solutions in cloud environments.
• Develop projects from scratch with minimal supervision and strong team collaboration.
• Guide teams and ensure high-quality delivery.
• Leverage AI-assisted development tools such as GitHub Copilot, Copilot agents, and Anthropic-based solutions.
• Choose the appropriate model and approach for each use case, balancing quality, speed, and cost.
• Design and maintain reusable prompts, instructions, and workflows to standardize AI usage across projects.
• Contribute to the adoption of modern engineering practices combining AI capabilities with strong quality and review processes.
• Ensure best practices in software quality, security, and scalability.
• Translate business needs into clear technical specifications, following a spec-driven development approach.
• Mentor other engineers and promote technical excellence.
• Participate, review, help and take care of the projects where your teammates are involved.
• Build scalable pipelines using a variety of technologies.
• Be up to date with the latest tools and technologies in the market.
  

Requirements

• More than 6 years of experience in software development with .NET, including designing and building end-to-end architectures in cloud environments.
• Ability to engage with clients, understand their needs, and design technical proposals tailored to business goals.
• Capable of leading projects independently and mentoring other engineers.
• Experience using GitHub Copilot or similar AI coding tools in real development workflows.
• Understanding of LLM usage, including prompt design, context management, and efficient usage.
• Ability to select the right tool or model depending on the problem.
• Experience using Azure services (bonus points for experience in other clouds like AWS or GCP).
• Experience in testing as essential part of development (unit, integration, etc.).
• Experience with any frontend framework or library (React, Angular or Vue).
• Hands-on experience building CI/CD pipelines.
• Knowledge of SQL and NoSQL databases.
• Experience with containers.
• Constant drive to learn and ability to learn quickly.
• Fluent in english and spanish.
• Strong team player mindset.

Very nice to have:

• Knowledge of Infrastructure as Code (IaC).
• Experience with advanced AI development workflows (Copilot agents, Anthropic, or similar).
• Familiarity with spec-driven development or strong practices around defining requirements and acceptance criteria.
• Experience helping teams adopt AI-assisted engineering practices.
• Awareness of cost-efficient and scalable AI usage patterns.

Benefits

• Salary determined by the market and your experience 🤑
• Flexible schedule 35 Hours / Week 😎
• Fully remote work (optional) 🌍
• Flexible compensation (restaurant, transport, and childcare) ✌
• Medical and dental insurance (completely free of charge for the employee) 🚑
• Individual budget for training or equipment and free Microsoft certifications 📚
• English lessons 🗽
• Birthday day off 🌴🥳
• Monthly bonus for electricity and Internet expenses at home 💻
• Discount on gym plan and sports activities 🔝
• Plain Camp (annual team-building event) 🎪
• Extra perks: events attendance and speakers, welcome pack, baby basket, Christmas basket, discount portal for employees ➕ The pleasure of always working with the latest technological tools!

Will you let us know you better?

The selection process: Simple, just 3 steps. 

• Phone screen
• 2 interviews with the team 🤘

What is Plain Concepts?

Plain Concepts is a global company of over 700 people passionate about technology and innovation. Since our founding, we have grown through technical proficiency and confidence in ideas that others might consider risky, creating custom solutions for our clients. With offices in more than 6 countries, our mission is to continue to drive cutting-edge projects around the world.

We are highly committed to technical excellence. We are known for developing highly customized projects, offering specialized technical consultancy and training.

Thanks to the great work of our technicians, we have been recognized for our ability to lead innovative projects that generate value, from artificial intelligence to blockchain, driving solutions that help companies optimize their performance.

What we do at Plain Concepts?
We pride ourselves on being a 100% technical team, dedicated to crafting custom projects from scratch, offering expert technical consultancy, and providing top-tier training.

• Our approach goes beyond traditional outsourcing; we focus on creating value together with our clients.
• Our teams are diverse and multidisciplinary, operating in a flat, collaborative structure.
• We live and breathe AGILE principles, ensuring flexibility and efficiency in everything we do.
• Knowledge-sharing is at our core: from supporting each other internally to contributing to the broader tech community through conferences, events, and talks.
• Innovation drives us — even the boldest ideas are welcome here.
• Transparency underpins all our relationships, fostering trust and long-term partnerships.

Want to learn more? Check out our website!

➡ plainconcepts.com  

At Plain Concepts, we certainly seek to provide equal opportunities. We want diverse applicants regardless of race, colour, gender, religion, national origin, citizenship, disability, age, sexual orientation, or any other characteristic protected by law.