Job Title: Senior Full-Stack Engineer

Company Name: LeadsMarket.com

Job Details: 15,Locations,In-Office,or,Remote,Senior,level

Job Url: https://builtin.com/job/senior-full-stack-engineer/8560878

Job Description: About the Role
We are looking for a Senior Platform Software Engineer to own the architectural integrity, scalability, and reliability of our core marketplace systems.
Our platform processes real-time transactions between buyers and sellers and requires strict latency control, high availability, and data integrity.
You will work closely with the CTO and DevOps team to evolve and stabilise high-load distributed systems.
AI-assisted development is part of our engineering model. We expect you to use AI tools to accelerate development and refactoring — while maintaining full ownership of architectural decisions and system quality.
Responsibilities
Design and evolve scalable backend services and APIs
Architect and refactor legacy components into modular, maintainable systems
Define and enforce architectural standards and engineering best practices
Optimise high-load systems (performance tuning, indexing, caching)
Design robust data models and implement complex business logic
Leverage AI tools to accelerate development, refactoring, and analysis
Review, validate, and refine AI-generated code
Contribute to cloud-native infrastructure decisions (Azure/AWS)
Improve observability, logging, fault tolerance, and resilience
Collaborate with DevOps on CI/CD pipelines and release processes
Participate in security hardening initiatives
AI Expectations
We expect engineers to:
Use AI tools daily as part of their workflow
Critically evaluate and refine AI-generated output
Maintain full ownership of correctness and architectural decisions
Continuously improve personal productivity through automation
Contribute to evolving AI-assisted development standards

AI is a multiplier, not a replacement for engineering judgment.
Required Skills
5+ years of experience in backend development (C#/.NET or similar stack)
Strong experience with ASP.NET Core or equivalent frameworks
Solid understanding of OOP, SOLID principles, and design patterns
Experience designing scalable architectures and RESTful APIs
Deep knowledge of MSSQL/PostgreSQL (query optimisation, indexing)
Familiarity with front-end technologies, JavaScript/TypeScript, frontend frameworks
Experience with distributed systems and microservices
Experience with performance profiling and debugging tools
Experience with caching strategies (Redis or similar)
Understanding of eventual consistency and data integrity trade-offs
Hands-on experience with Docker and CI/CD pipelines
Experience deploying to Azure or AWS
Experience using AI-assisted development tools productively
Strong code review and system reasoning skills
English B2+

Nice to Have
Experience with container orchestration (Kubernetes)
Experience with high-load or real-time marketplaces
Experience with Angular/React

What We Value
Systems thinking over feature hacking
Ownership mindset
Ability to balance speed with structural integrity
Comfort working in a compact, high-impact team