Senior Full Stack Product Engineer

Marsello

. Own technical direction and architecture for major areas of the platform .

Posted 9/28/2026full-timeRemote • New ZealandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and delivering robust backend systems and APIs using C#, .NET, MongoDB, and AWS, while mentoring engineering teams and enhancing technical standards. Proven ability to lead complex product initiatives and collaborate effectively across teams in a SaaS environment.

Highest-signal resume keywords

C#.NETMongoDBAWSReact

ATS Keywords

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Hard Skills

Software DevelopmentBackend System DesignWeb APIsCI/CDSystem Design

Soft Skills

Excellent CommunicationCollaborative MindsetMentoring

Tools & Technologies

TerraformAI Coding Agents

Industry Keywords

SaaSObservabilityProduction Systems

Tech Stack

Tools & technologies

AWSMongoDBReactTerraformTypeScript.NET

About the role

Key responsibilities & impact

Own technical direction and architecture for major areas of the platform
Lead delivery of complex product initiatives
Design robust, scalable backend systems and APIs across the .NET and MongoDB stack
Contribute to architecture, infrastructure and engineering strategy
Design and deliver features end-to-end across .NET, MongoDB, React and AWS
Make trade-offs on data modelling, performance, reliability and maintainability
Contribute to infrastructure, observability and platform improvements across AWS
Participate in the engineering support rotation and solve complex customer issues
Mentor intermediate and junior engineers through pairing, coaching and technical guidance
Use modern development tooling, including AI coding agents, while maintaining quality
Raise the technical capability and standards of the wider engineering team

Requirements

What you’ll need

Strong software development experience in a SaaS environment
Deep experience designing, building and owning backend systems end-to-end
Deep expertise with C#, .NET, Web APIs and MongoDB
Solid React/TypeScript experience on the front end
Strong architectural and system-design skills
Good instincts for scale, performance and reliability
Hands-on experience with AWS
Confidence working with Terraform
Solid understanding of CI/CD, observability and operating production systems
Excellent communication skills
Ability to work effectively across engineering, product and customer-facing teams
Collaborative mindset and desire to help others grow
Comfort using AI-assisted development tools
Candidate must be based in New Zealand

Benefits

Comp & perks

Southern Cross healthcare
A day off for your birthday
A friendly, hard-working culture
A supportive growth environment
Globally distributed team
Meaningful product challenges
Real ownership over architecture and systems