Senior Full-Stack Engineer, door3
More information about location
Technology & design consultancy
Be an early applicant
Technology & design consultancy
21-100 employees
Be an early applicant
More information about location
21-100 employees
Company mission
To modernise and evolve enterprises, whether it’s a single business application or an entire organisation.
Role
Who you are
- We are looking for a highly skilled Senior Full-Stack Engineer with deep experience in Node.js and React, and a solid background in .NET
- The ideal candidate combines strong technical capabilities with a pragmatic approach to software design and delivery, a good understanding of system architecture, and the ability to communicate effectively with both technical and non-technical stakeholders
- Experience or interest in AI tools and modern ML-based solutions is a strong plus
- 8+ years of professional software development experience, with a primary focus on back-end engineering and solid full-stack capability
- 5+ years of experience building scalable backend systems using Node.js and TypeScript, with frameworks like Express.js or NestJS
- 2+ years of hands-on experience with .NET (C#), preferably developing APIs or enterprise integrations using .NET Core
- Proficiency in designing and developing RESTful or gRPC services, with a solid grasp of microservice patterns and distributed architectures
- Deep experience with SQL databases (e.g., PostgreSQL, MySQL) and NoSQL systems (e.g., MongoDB, Redis)
- Working knowledge of AWS services (e.g., EC2, RDS, Lambda, S3) and container orchestration with Docker and Kubernetes
- Familiarity with CI/CD pipelines, monitoring tools, and debugging techniques for high-scale production systems
- Strong understanding of back-end fundamentals: networking, performance, observability, and security best practices
- 3+ years of experience building and maintaining React applications with TypeScript
- Proficient in core web technologies: HTML, CSS, and modern JavaScript
- Familiarity with state management (e.g., react-query, Redux) and UI performance best practices
- Experience designing reusable UI components and working with component libraries or custom design systems
- Comfortable with front-end and back-end integration patterns and API-driven development
- Excellent communication skills – able to translate technical solutions to non-technical stakeholders
- Strong collaboration and mentoring mindset – enjoys working with others and sharing knowledge
- Curious and proactive learner, especially around new tech and architectural patterns
- Pragmatic problem-solver who prioritizes delivery and business impact over technical complexity
- Comfortable working in remote/distributed teams and agile environments
- English proficiency: Upper-Intermediate (B2+) or higher across all four skills
Desirable
- Experience integrating Stripe or other payment processing platforms
- Exposure to OpenAPI/Swagger for client/server code generation
- Experience in .NET Core APIs or transitioning between monolith and microservices architectures
- Familiarity with AI/ML concepts, tools, and frameworks (e.g., LangChain, Hugging Face, OpenAI API)
- Prior work on eCommerce, enterprise, or data-intensive applications
- Experience with event-driven systems (e.g., RabbitMQ, Kafka)
- Familiarity with GraphQL or other modern API paradigms
What the job involves
- Lead and participate in the full software development lifecycle: planning, designing, developing, testing, and maintaining scalable web applications
- Develop and maintain backend services using Node.js, with occasional work on .NET-based components
- Design and build modern SPAs using React and TypeScript with a focus on reusability and performance
- Collaborate cross-functionally with designers, product managers, and other engineers to deliver high-impact features
- Participate in architectural decisions, code reviews, and mentorship of mid- and junior-level developers
- Build and integrate scalable APIs and third-party services (e.g., Stripe, OpenAPI-based clients)
- Ensure the codebase adheres to best practices including SOLID principles, clean code, and scalable architecture
- Participate in agile development processes, including sprint planning, retrospectives, and standups
- Troubleshoot complex issues across the stack, from the browser to backend services and infrastructure
- Contribute to infrastructure decisions including CI/CD, containerization, and deployment in AWS/Kubernetes environments
- Optionally support or experiment with integrating AI-based tools into engineering workflows or product functionality
Our take
Door3 is a consultancy in technology, software development and user experience design. It focusses on tailoring its service to the needs and wants of each client, and is able to work across many sub-sectors - like project management and quality assurance - that require a lot of skill and expertise.
It's impressive that the relatively small Door3 is able to provide such a broad offering. Since founding in 2002, the company has completed hundreds of successful projects and worked with an impressive client roster including the likes of The American Museum of Natural History and Johnson and Johnson.
Maintaining a steady pace, Door3 has opened three offices since founding (two of which are in the U.S and one in Switzerland). It will be interesting to see how the company evolves with the more demanding and complex needs of the design and development world with the likes of Web3 features and AI technology becoming more prevalent.
Freddie
Company Specialist at Welcome to the Jungle
Insights
8% employee growth in 12 months
Company
Company HQ
Murray Hill, New York, NY
Leadership
Alex Asianov
(President)Worked as a Consultant for both Press Ganey Associates and FreshDirect and a Portal Architect for The Community Preservation Corporation.
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