Senior Full Stack Engineer (Labs)

K Id

Singapore

On-siteCareer-pivot friendly

Who this role is best for

Best suited to experienced full stack engineers with a preference for innovation and collaboration, working in a startup or high growth environment focused on global compliance and AI-driven infrastructure.

Best fit for

Candidates with 6+ years of experience in startups or high-growth environments and a track record of building production-ready systems
— “6 or more years of professional software engineering experience, ideally in a startup or high growth environment”
Individuals who thrive in ambiguity and are comfortable shaping processes and systems as they evolve
— “This is a hands-on senior role for someone who executes independently, makes sound technical decisions, and thrives where systems and processes are still taking shape”
Engineers who have experience working with coding agents and can design, review, and iterate on their output
— “Demonstrated experience using coding agents for production work, including how you specify work for them and how you review what they produce”

Things to consider

Requires daily overlap with the team starting at 14:00 UTC, which may affect flexibility for candidates in different time zones
— “Ability to work with a few hours of overlap each day with the wider team, starting from 14:00 UTC”
Candidates must be comfortable operating and maintaining systems they build, not just developing them
— “Experience taking a system from technical design through to production, and operating it once it is there”

How to stand out

Emphasize your ability to write detailed specifications and review code to a high standard
— “Write the detailed specifications that agents build against, and review the resulting code to a high standard”
Showcase your work with modern frontend tech like Next.js and React in your portfolio or resume
— “Develop responsive, reliable, and maintainable applications using Next.js and related technologies”
Demonstrate your ability to make architecture decisions and own the quality of your work
— “You will make architecture calls, own the quality bar, and operate what you ship”
Include examples of working with designers to create polished user experiences
— “Work with product managers, designers, and legal stakeholders to turn complex requirements into clear and usable product experiences”

Pace · Fast PacedCollaboration · HighAutonomy · MediumDecision Impact · Team

Derived from job-description analysis by Serendipath's career intelligence engine.

What success looks like

built and maintained full stack applications
operated systems in production

Typical background

6+ years of professional software engineering experience

Skills & requirements

Required

Full Stack DevelopmentGo, Typescript, React, Next.jsServer Rendered Web ApplicationsPartnering With Designers

Preferred

Compliance Related Product Environments

Stack & domain

Full Stack EngineeringGoTypeScriptReactNext.jsPostgreSQLRedisS3KubernetesServer Rendered Web ApplicationsModern Frontend ArchitectureProduct DevelopmentComplianceRegulatory LogicAPI DevelopmentAge VerificationParental ConsentDigital SafetyPrivacy-first ComplianceAge Verification InfrastructureCompliance Development Kit (cdk)AgekitDigital EcosystemsGame PublishersApisLeadershipCommunicationTeamworkProblem-solvingAdaptabilityTime ManagementConflict ResolutionTeam DevelopmentEngagementPositive AttitudeDriveGritEnthusiasmSoftware Engineering

About the role

Original posting from K Id via Ashby

JOB TITLE: SENIOR FULL STACK ENGINEER (LABS) - SINGAPORE
COMPANY OVERVIEW
k-ID is the global leader in privacy-first compliance and age verification infrastructure. Recognized as one of TIME's Best Inventions of 2025, named a Tech Pioneer by the World Economic Forum and a winner of Fast Company's Next Big Things in Tech, we are building the Age Layer for the internet—the fundamental infrastructure that allows digital platforms to verify age and manage compliance globally without friction.
Our core platform, anchored by the Compliance Development Kit (CDK) and AgeKit, is the trusted engine for the world's largest game publishers and digital ecosystems. We replace fragmented, manual compliance with a unified API that handles age verification, parental consent, and regulatory logic across 200+ markets. Backed by top-tier venture capital firms like a16z and Lightspeed, k-ID is entering a phase of growth to define the standard for global digital safety.
JOB SUMMARY
Labs is k-ID's innovation team. It builds the products and capabilities that become the next generation of the platform, working closely with the customers who will be the first to use them.
As a Senior Full Stack Engineer in Labs, you own the build. You take validated ideas and turn them into products a customer runs in production, then you make them hold up as that customer scales. The work reaches real users quickly, and you will be close to the people using it.
Labs builds with agents. Day to day that means writing detailed specifications, working with agents to build against them, reviewing the code that comes back, and continually iterating on and improving your own rig so that the next build is better than the last. Shaping how the team works this way is part of the role, not a side effect of it.
This is a hands-on senior role for someone who executes independently, makes sound technical decisions, and thrives where systems and processes are still taking shape. You will make architecture calls, own the quality bar, and operate what you ship.
QUALIFICATIONS
Bachelor's degree in Computer Science or equivalent practical experience
6 or more years of professional software engineering experience, ideally in a startup or high growth environment
Demonstrated experience using coding agents for production work, including how you specify work for them and how you review what they produce
Strong experience with Go, TypeScript, React, and Next.js
Experience building modern full stack applications using technologies such as PostgreSQL, Redis, S3, and Kubernetes
Experience with server rendered web applications and modern frontend architecture
Experience taking a system from technical design through to production, and operating it once it is there
Experience partnering with designers to build polished and intuitive user experiences
Comfort working across product requirements, technical design, implementation, testing, and production support
Ability to operate effectively in a fast paced environment with ambiguity and changing priorities
Strong written and verbal communication skills in English
Ability to work with a few hours of overlap each day with the wider team, starting from 14:00 UTC
Familiarity with compliance related or regulated product environments is a plus, but not required
RESPONSIBILITIES
Build and maintain the full stack applications behind k-ID's newest products, from first release through to production scale
Write the detailed specifications that agents build against, and review the resulting code to a high standard
Iterate on and improve your own development rig so that each build is better than the last
Contribute to technical design and implementation decisions across frontend, backend, APIs, and data flows
Harden new systems for load and accuracy before they scale
Work with product managers, designers, and legal stakeholders to turn complex requirements into clear and usable product experiences
Develop responsive, reliable, and maintainable applications using Next.js and related technologies
Improve and support production systems by identifying issues, debugging effectively, and shipping fixes with care
Write clean, well tested code and help maintain a high bar for code quality, performance, and developer experience
Participate in code reviews, technical discussions, and team problem solving
Contribute positively to the engineering culture through ownership, collaboration, and a willingness to improve how the team works
BENEFITS
Competitive Salary
A competitive startup salary aligned with experience and market benchmarks.
Employee Stock Ownership Plan so you participate directly in the long term upside of the company.
Health and Wellbeing
Comprehensive family health coverage, including medical, dental, and vision benefits
Provided Mental Health and Wellness support benefit
Professional Development
Hands on exposure with key clients in a scaling global tech company
The freedom to build your own tooling, and a hand in defining how k-ID builds with AI
Opportunities for continuous learning through real ownership rather than formal training alone.
Direct collaboration with the Founders and the tech leadership team
Culture and Ways of Working
A collaborative, inclusive and low politics work environment.
Flexible, trust based working culture shaped by a US startup operating model.
A mission driven company focused on improving online experiences for kids and teens globally.
Applicants Privacy Policy https://k-id.com/job-applicants-privacy-notice

Source: K Id careers (Ashby)