Own architecture and scalability of high-load marketplace systems. Design/refactor backend services and APIs, optimize performance, improve observability, collaborate on CI/CD and cloud deployments, and integrate AI-assisted development while maintaining system reliability and security.
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
Top Skills
.Net
Angular
Asp.Net Core
AWS
Azure
C#
Ci/Cd
Docker
JavaScript
Kubernetes
Mssql
Postgres
React
Redis
Typescript
Similar Jobs
Consumer Web • Digital Media • Software
The role involves shipping full-stack AI projects, designing experiments for AI features, and optimizing AI infrastructure while collaborating with teams.
Top Skills:
MySQLPostgresReactRuby On Rails
Consumer Web • Digital Media • Software
The role involves shipping quality code, managing end-to-end projects, collaborating to improve user experiences, and scaling billing infrastructure and analytics.
Top Skills:
CSSMySQLPostgresReactRuby On RailsScssTailwindcssTypescript
Consumer Web • Digital Media • Software
The role involves leading features and full stack development of the payment and billing systems, integrating payment solutions, and optimizing user experiences.
Top Skills:
CSSMySQLPaypalPostgresReactRuby On RailsScssStripeTailwindcssTypescript
What you need to know about the NYC Tech Scene
As the undisputed financial capital of the world, New York City is an epicenter of startup funding activity. The city has a thriving fintech scene and is a major player in verticals ranging from AI to biotech, cybersecurity and digital media. It also has universities like NYU, Columbia and Cornell Tech attracting students and researchers from across the globe, providing the ecosystem with a constant influx of world-class talent. And its East Coast location and three international airports make it a perfect spot for European companies establishing a foothold in the United States.
Key Facts About NYC Tech
- Number of Tech Workers: 549,200; 6% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: Capgemini, Bloomberg, IBM, Spotify
- Key Industries: Artificial intelligence, Fintech
- Funding Landscape: $25.5 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Greycroft, Thrive Capital, Union Square Ventures, FirstMark Capital, Tiger Global Management, Tribeca Venture Partners, Insight Partners, Two Sigma Ventures
- Research Centers and Universities: Columbia University, New York University, Fordham University, CUNY, AI Now Institute, Flatiron Institute, C.N. Yang Institute for Theoretical Physics, NASA Space Radiation Laboratory
