Senior .Net Backend Engineer Full Time NEW

For this vacancy, we require senior .Net Engineers with experience working on AWS, and building advanced agentic workflows. Competitive day rates, outside IR35, fully remote.

Reapit – Who are we?

Reapit is the original end-to-end business technology provider for estate agencies of all sizes. We’ve been helping sales and lettings agents build relationships and grow their businesses for more than 25 years.

Our technology empowers property professionals across Europe, the Middle East, Australia, and New Zealand to work with buyers, sellers, tenants, and landlords to deliver a dream home experience.

Worldwide, over 100,000 agents across more than 15,000 branches use Reapit to run their businesses, manage properties, collect rent, engage clients, and provide outstanding customer service every time.

What you’ll be doing

Reporting to the Director of Engineering, you’ll operate as a highly senior, technically hands-on backend engineer, embedded into a squad and owning delivery of substantive, cloud-native services end-to-end. Ad-hoc client interaction, supporting requirements discovery and technical solutioning where needed.

· Architecting, building and shipping complex, high-performance distributed services in C# and .NET Core 8/9 – primarily serverless on AWS Lambda – setting the technical bar for the squad and owning delivery of substantive feature sets end-to-end.

· Designing data models and persistence patterns across Aurora RDS MySQL and DynamoDB – picking the right tool for the workload, tuning for performance at scale, and modelling for both transactional and high-throughput access patterns.

· Building resilient, event-driven systems with SQS and related AWS messaging primitives – idempotency, retries, dead-letter handling, and clean separation of concerns across services.

· Owning each feature’s solution end-to-end – partnering with Business Analysts who capture high-level problems and workflows, then driving product thinking, scoping, trade-offs and delivery yourself.

· Leveraging Claude Code and advanced agentic workflows at pace – orchestrating sub-agents, managing context, running parallel workstreams and embedding AI-native engineering patterns into everyday delivery.

· Designing clean, well-versioned, well-documented APIs that other engineers enjoy consuming – treating developer experience and contract stability as first-class concerns.

· Inputting into architecture and technical direction in collaboration with Principal Engineers – making considered, well-reasoned decisions on service boundaries, data design, messaging patterns, consistency guarantees and performance.

· Championing a high-quality engineering culture – test coverage, peer review, CI/CD discipline via GitHub Actions, Infrastructure as Code, secure coding, observability and performance – aligned to the Reapit Global Technology Strategy, Reapit Connect and agentic tooling.

· Mentoring and up-levelling engineers around you through pairing, PR review, architectural guidance and practical coaching on AI-assisted development.

Who we’re looking for

At Reapit, we prioritise hiring individuals who share our values and possess the right attitudes and behaviours for success. Whilst all the listed qualities are desirable, don’t worry if you don’t meet all of them, we’d still like to hear from you.

· A proven senior-to-staff-level backend engineer with deep, current expertise in C# and .NET Core 8/9 – you can architect and lead design of distributed REST API microservices at scale.

· Authority in AWS serverless architecture – Lambda-first, with strong working knowledge of API Gateway, SQS, Step Functions, EventBridge and IAM, and a track record of shipping production workloads on this stack.

· Deep data expertise across Aurora RDS MySQL and DynamoDB – complex schema and access-pattern design, query tuning, indexing, single-table vs multi-table trade-offs, and a pragmatic view on consistency, scaling and cost.

· Proven track record designing event-driven systems with SQS (and adjacent AWS messaging) – idempotency, ordering, retries, dead-letter handling and operational robustness.

· Strong API design sensibility – versioning, documentation, throttling, backwards compatibility and an obsession with the developer experience of the services you own.

· A strong product brain. You’re comfortable operating without a traditional Product Owner – partnering with BAs on high-level problems, then making sensible product trade-offs, prioritising ruthlessly and owning the solution through to delivery.

· Strong communication skills and comfortable with ad-hoc client interaction – able to join a requirement or technical solutioning session, ask the right questions, and translate outcomes into shippable work.

· A proven track record with Claude Code and advanced agentic workflows – you can evidence shipping real work via multi-agent patterns, orchestrating sub-agents, managing context, defining custom commands/skills and scaling AI-assisted delivery across a team.

· Rigorous engineering standards – fluency with Git-based workflows, trunk-based development, CI/CD (ideally GitHub Actions), Infrastructure as Code (AWS CDK or Terraform), comprehensive testing (unit, integration and contract), and a genuine commitment to observability, performance and secure-by-default coding.

· Technical leadership without the title – a track record of lifting teams through pairing, mentoring, PR review and example, rather than through line-management.

· A pragmatic, outcome-oriented mindset – biased to shipping, comfortable with ambiguity, and able to make sensible calls on scope, technical debt and sequencing under time pressure.

· Nice to have: hands-on experience with OpenSearch and/or AWS AppSync – both feature in our stack and would accelerate time-to-value, but neither is essential.

What your impact and success looks like

As a Backend Engineer we expect your success and impact over the stages of your contract with us to look something like this:

Within 1 month:

· Fully onboarded onto the Reapit stack – Reapit Connect, the relevant .NET services and AWS environments – shipped first production endpoints and / or services.

· Established trusted working relationships with the Director of Engineering, Principal Engineers, Business Analysts and the relevant squad.

· Configured Claude Code and our approved agentic tooling to our internal standards, and started running meaningful work through multi-agent patterns.

· Built a clear, independent view of the target services, data model, database schemas, messaging topology and immediate delivery priorities – and surfaced any early risks or recommendations.

Within 3 months:

· Owning end-to-end delivery of substantive services – taking from BA-level problem statement through to production on Lambda, Aurora and DynamoDB, with you driving the product trade-offs as well as the engineering.

· Recognised as a go-to technical voice within the squad – inputting into architectural decisions alongside Principal Engineers, raising the quality bar on PRs, and unblocking complex backend, data and messaging problems.

· Meaningfully influenced our wider engineering practice – patterns you’ve introduced for agentic delivery, Claude Code usage, serverless design or data modelling.

· Shipped APIs and services that are visibly well-designed, well-documented and performant – other engineers find them pleasant to consume, and they hold up under production load.

· Left a well-documented, well-tested, maintainable footprint – so that whether the contract is extended or handed over, the work continues to deliver value without you in the room.

What’s in it for you?

We operate a Flexible Working Policy and there is no expectation around in-person attendance, beyond occasional ad-hoc project meetings in our Solihull or London offices.

You can expect an industry competitive day rate.

Don’t tick all the boxes? Neither do we

We care about our industry and want it to become a more inclusive and diverse place to work. So, we’re driven by hiring not only by experience and relevance for the role but by sharing our values and the right attitudes and behaviours for success.

We are committed to Equal Employment Opportunity through attracting and retaining a complementary team of employees and building an inclusive environment for all.

We feel we have an empowering environment where everyone is supported and respected, and we want you to feel this too. We welcome new ideas, thinking and approaches, whilst listening to all our employees.