At a Glance
- Tasks: Lead the architecture and build of a cutting-edge B2B SaaS platform using C# and .NET.
- Company: Innovative tech firm focused on high-performance distributed systems.
- Benefits: Competitive daily rate, fully remote work, and opportunity to use advanced AI tools.
- Other info: Dynamic role with opportunities for professional growth and innovation.
- Why this job: Join a greenfield project and make a significant impact in the tech industry.
- Qualifications: Expertise in C#, .NET, and AWS serverless technologies required.
The predicted salary is between 81000 - 99000 £ per year.
Senior C# Engineer .
NET 9/10, AWS Lambda, SQS, SNS OUTSIDE IR35 £700£800 per day Outside IR35 ? 100% Remote 9 month rolling contract
Takeaway: Contribute to the architecture and build of a major greenfield B2B Saa S platform as a deeply senior, hands-on C# engineer, with heavy emphasis on deep .
NET engineering, high-performance distributed systems, and real-world AWS serverless delivery.
Youll also have the opportunity to develop hands-on skills with Claude Code, one of the most advanced AI-assisted development tools in the industry.
Role
Overview: Youll operate as the technical spearhead for a greenfield product build, reporting to the Director of Engineering.
Expect deep backend engineering, distributed system design, and high-quality serverless delivery, plus the chance to adopt modern AI-assisted development practices as part of your workflow.
- What
- Youll
Bring
- Senior/Staff-level backend mastery in C# and . NET 9/10, with the ability to architect and lead distributed REST microservices at scale.
- Strong authority in AWS serverless engineering: Lambda-first mindset, hands-on experience with API Gateway, SQS, Step Functions, Event Bridge and IAM.
- Deep data expertise across Aurora My SQL and Dynamo DB: schema design, access patterns, indexing, query tuning, and pragmatic trade-offs around consistency, scale and cost.
- Real-world experience designing event-driven systems with SQS: idempotency, retries, ordering, DLQs and operational resilience.
- Strong API design sensibility: versioning, documentation, throttling, backwards compatibility, and a genuine obsession with developer experience.
- Product-first mindset: comfortable shaping requirements, partnering with BAs, and operating without a traditional PO.
- ...
Senior C# Developer .NET 9/10, AWS Lambda, SQS, SNS Outside IR35 in London employer: Smart Sourcer
As a Senior C# Developer at our company, you will join a dynamic and innovative team dedicated to building cutting-edge B2B SaaS solutions. We pride ourselves on fostering a collaborative work culture that encourages continuous learning and professional growth, offering access to advanced tools like Claude Code to enhance your development skills. With the flexibility of 100% remote work and competitive daily rates, this role provides an exceptional opportunity for meaningful contributions in a forward-thinking environment.
StudySmarter Expert Advice🤫
We think this is how you could land Senior C# Developer .NET 9/10, AWS Lambda, SQS, SNS Outside IR35 in London
✨Get Involved in Open-Source Projects
Diving into open-source projects is a brilliant way to showcase your skills and connect with other developers in the community. Not only will you beef up your GitHub profile but you might also catch the eye of someone at Smart Sourcer who values hands-on experience over just theory.
✨Attend Local Tech Meetups
Tech meetups are gold mines for networking and discovering job opportunities, especially in the fast-paced world of software engineering. Check out local listings for events in your area and don’t shy away from introducing yourself. This could lead directly to a temporary position at Smart Sourcer!
✨Showcase Your Work Online
With temporary roles, it’s all about standing out in a short space of time. Create a portfolio website where you highlight your projects and skills. Talk about your code, and provide links to your GitHub repositories. This will not only demonstrate your abilities but will also make it easier for recruiters at Smart Sourcer to see what you bring to the table.
✨Leverage Temporary Job Boards
Don’t forget to check specialised job boards for temporary software development roles. Websites like We Work Remotely or Remote OK often list short-term gigs that can be a perfect fit. Apply directly through our website as well, making sure your application is sharp—temporary roles can move fast!
We think you need these skills to ace Senior C# Developer .NET 9/10, AWS Lambda, SQS, SNS Outside IR35 in London
Some tips for your application 🫡
Show Off Your Tech Skills:Make sure your CV highlights your tech stack and any programming languages you’re proficient in. Include specifics about any frameworks or technologies you’ve worked with; they can make you stand out in the sea of applicants. It’s all about showing that you have the chops we need at Smart Sourcer!
Portfolio 2.0:Since you’re applying for a temporary gig, it’s super important to showcase a portfolio that highlights your best projects. Include links to GitHub or any personal projects that demonstrate what you can do in a real-world environment. This gives us a taste of your style and your problem-solving approach!
Keep It Brief and Relevant:With a temporary position, we want to see your ability to hit the ground running. Be concise in your CV and cover letter; stick to experiences that directly relate to the role. Highlight any previous temporary roles or freelance gigs that show your adaptability and quick learning!
Tailor Your Cover Letter:Don’t just send a generic cover letter. Personalise it for Senior C# Developer .NET 9/10, AWS Lambda, SQS, SNS Outside IR35 at Smart Sourcer! Mention why this temporary role excites you and how you see yourself contributing in the short run. Show us what you've got and why you're the one for this quick turn-around!
How to prepare for a job interview at Smart Sourcer
✨Nail the Technical Skills
For a software engineering role, you'll likely face technical questions or coding tasks during your interview. Brush up on the relevant programming languages and frameworks that Smart Sourcer uses, and don’t forget to practice some coding challenges on platforms like LeetCode or HackerRank. Showing your coding prowess can really make you stand out!
✨Prepare for System Design Questions
Even for a temporary role, having a grasp of system design principles can be crucial. Be ready to discuss how you would architect a software solution, including discussing trade-offs, scalability, and performance considerations. Having examples from previous projects can really show off your analytical thinking.
✨Demonstrate Your Adaptability
Since this is a temporary role, you'll want to emphasise your ability to hit the ground running. Highlight experiences where you quickly adapted to new technologies or teams. Let’s make it clear to the interviewers at Smart Sourcer that you can learn on the job and deliver results in a short timeframe!
✨Show Off Your Portfolio
Make sure to have a portfolio or GitHub ready showcasing your projects. Having tangible evidence of what you've done—be it personal projects, contributions to open-source, or previous work—can convey how capable you are. Tailor this for what might interest Smart Sourcer, so it's relevant and sparks conversation during your interview.
