At a Glance
- Tasks: Lead the architecture and build of a greenfield SaaS platform using C# and AWS.
- Company: Innovative tech firm focused on high-performance distributed systems.
- Benefits: Competitive daily rate, fully remote work, and opportunity to work with advanced AI tools.
- Other info: 11-month rolling contract with excellent career growth potential.
- Why this job: Shape the future of tech with cutting-edge tools and impactful projects.
- Qualifications: Senior-level expertise in C#/.NET and AWS serverless engineering required.
The predicted salary is between 60750 - 74250 £ per year.
Lead the architecture and build of a greenfield SaaS 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. You will 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: You will 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 You Will Bring:
- Senior/Staff-level backend mastery in C# and .NET 8/9, 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, EventBridge and IAM.
- Deep data expertise across Aurora MySQL and DynamoDB: 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.
- Excellent communication skills and confidence in ad-hoc client interaction.
- Rigorous engineering standards: Git-based workflows, trunk-based development, CI/CD (GitHub Actions), IaC (CDK/Terraform), comprehensive testing and secure-by-default coding.
- Pragmatic, outcome-oriented, comfortable with ambiguity, and biased toward shipping.
What You Will Own:
- Architecting, building and shipping complex, high-performance distributed services in C#/.NET 8/9 on AWS Lambda.
- Designing and delivering resilient event-driven systems using SQS and related AWS messaging primitives.
- Owning features end-to-end: product thinking, scoping, trade-offs, sequencing and delivery.
- Designing clean, well-versioned, well-documented APIs that other engineers love to consume.
- Championing a high-quality engineering culture: testing discipline, peer review, CI/CD excellence, observability, performance and secure coding.
- Developing hands-on skills with Claude Code, including AI-assisted development patterns, smart refactoring, automated context management and productivity-boosting workflows.
Contract Details: £700-£800/day Outside IR35 100% remote (UK) 11-month rolling contract.
Senior C# Engineer.NET 9, AWS Lambda, SQS, SNS Outside IR35 employer: Smart Sourcer Limited
As a Senior Backend TypeScript Engineer at our company, you'll be part of a dynamic and innovative team that champions high-performance distributed systems and serverless architecture. We offer a fully remote work environment, competitive daily rates, and the unique opportunity to enhance your skills with cutting-edge AI-assisted development tools like Claude Code. Our culture prioritises collaboration, rigorous engineering standards, and continuous professional growth, making us an excellent employer for those seeking meaningful and rewarding work in the tech industry.
StudySmarter Expert Advice🤫
We think this is how you could land Senior C# Engineer.NET 9, AWS Lambda, SQS, SNS Outside IR35
✨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 Limited 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 Limited!
✨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 Limited 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# Engineer.NET 9, AWS Lambda, SQS, SNS Outside IR35
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 Limited!
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# Engineer.NET 9, AWS Lambda, SQS, SNS Outside IR35 at Smart Sourcer Limited! 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 Limited
✨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 Limited 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 Limited 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 Limited, so it's relevant and sparks conversation during your interview.
