Senior Fullstack Engineer Job at Whatnot

Senior Software Engineer - Fullstack

We build simple yet innovative consumer products and developer APIs that shape h...

Location

United States , San Francisco

Salary:

180000.00 - 270000.00 USD / Year

Plaid

Expiration Date

Until further notice

Requirements

5+ years of experience with extensive experience in software engineering with a proven track record of shipping successful projects
Experience with MySQL or other relational databases
Experience working with microservices
Working knowledge of HTML, CSS, Javascript and modern frameworks and libraries
Excellent coding, testing skills, and system design skills
Proven experience with cross-functional collaboration, communication and project management skills
Demonstrated leadership skills and the ability to mentor and guide junior engineers
Experience partnering with operations, product, design, and data science

Job Responsibility

Design & Development: Design, develop and maintain both frontend and backend components
Majority Backend Focus (60-70%): Develop APIs and services, focusing on scalability, security and performance
Frontend Focus (30-40%): Build delightful experiences using modern JavaScript frameworks and libraries
Collaboration: Work closely with product managers, product designers and other stakeholders to define and implement new features that meet product and customer needs
Code Quality: Write clean, maintainable and efficient code
Testing & Debugging: Develop automated tests to ensure the quality and reliability of the codebase. Troubleshoot and resolve issues
Engage in hands-on coding and architectural design, setting and maintaining high technical standards for a high performing team
Grow the team via mentorship and leadership, reviewing technical documents and code changes

What we offer

medical
dental
vision
401(k)

Fulltime

Senior Software Engineer - Fullstack

We build simple yet innovative consumer products and developer APIs that shape h...

Location

United States , New York

Salary:

180000.00 - 270000.00 USD / Year

Plaid

Expiration Date

Until further notice

Requirements

5+ years of experience with extensive experience in software engineering with a proven track record of shipping successful projects
Experience with MySQL or other relational databases
Experience working with microservices
Working knowledge of HTML, CSS, Javascript and modern frameworks and libraries
Excellent coding, testing skills, and system design skills
Proven experience with cross-functional collaboration, communication and project management skills
Demonstrated leadership skills and the ability to mentor and guide junior engineers
Experience partnering with operations, product, design, and data science

Job Responsibility

Design & Development: Design, develop and maintain both frontend and backend components
Majority Backend Focus (60-70%): Develop APIs and services, focusing on scalability, security and performance
Frontend Focus (30-40%): Build delightful experiences using modern JavaScript frameworks and libraries
Collaboration: Work closely with product managers, product designers and other stakeholders to define and implement new features that meet product and customer needs
Code Quality: Write clean, maintainable and efficient code
Testing & Debugging: Develop automated tests to ensure the quality and reliability of the codebase. Troubleshoot and resolve issues
Engage in hands-on coding and architectural design, setting and maintaining high technical standards for a high performing team
Grow the team via mentorship and leadership, reviewing technical documents and code changes

What we offer

medical
dental
vision
401(k)

Fulltime

Senior Fullstack Engineer

Build and enhance a platform that supports the collection and analysis of intell...

Location

United Kingdom

Salary:

100000.00 GBP / Year

Arrows Groupe

Expiration Date

Until further notice

Requirements

5+ years of commercial software engineering experience
Proficiency with AWS, Kubernetes, Postgres, and Terraform
Strong coding skills in JavaScript, TypeScript, or Python
Experience integrating systems to improve operational efficiency
Collaborative, communicative, and data-driven in decision-making
Passionate about cryptocurrencies and blockchain technology

Job Responsibility

Design and develop software tools for intelligence collection and analysis
Create systems to analyze cryptocurrency behavior on both the clear and dark web
Implement observability tools (e.g., DataDog) to monitor and resolve issues
Mentor team members and promote engineering best practices
Contribute to the team’s technical strategy and decision-making

What we offer

Flexible Work: Hybrid setup with up to 90 days remote work per year and a £500 home office budget
Learning & Development: $1,000 annual budget and LinkedIn Learning access
Time Off: 25 days annual leave, bank holidays, birthday off, and enhanced parental leave
Health & Wellness: Private health insurance, mental health support, life assurance, and a crypto bonus
Other Perks: Cycle to Work scheme and a strong commitment to diversity, equity, and inclusion

Fulltime

Senior Fullstack Engineer - AI group

We’re hiring a Senior Fullstack Engineer to shape the future of the enterprise b...

Location

Salary:

Not provided

Island

Expiration Date

Until further notice

Requirements

5+ years of experience as a Fullstack Engineer
Hands-on experience with cloud platforms (AWS, GCP, or Azure)
Strong skills in both modern frontend and backend technologies
Ability to thrive in fast-paced, collaborative environments
Passion for working with cutting-edge AI technologies

Job Responsibility

Shape the future of the enterprise browser with AI
Blend cutting-edge AI engineering with user-centric design to build intelligent, autonomous systems capable of reasoning, planning, and executing tasks across enterprise workflows
Transform the enterprise browser into an intelligent, proactive workspace — streamlining workflows, anticipating user needs, and boosting productivity

Fulltime

Senior Fullstack QA Engineer

TradingView is the world’s #1 platform for all things investing. 100M+ users tru...

Location

Cyprus , Tbilisi

Salary:

Not provided

TradingView

Expiration Date

Until further notice

Requirements

Strong experience in backend API testing
Experience testing services in Python (Django) and Go
Experience testing frontend (React/TypeScript or similar SPA frameworks)
Solid understanding of QA methodologies and processes
Team player with a proactive, responsible, and detail-oriented mindset

Job Responsibility

Testing backend services built with Python (Django) and Go
Testing frontend applications in React/TypeScript
Writing and maintaining automated tests (python, go, allure)
Creating and maintaining test cases and documentation
Working closely with developers and product managers

What we offer

Flexible hours
Hybrid approach (office + remote, depending on team and location)
Modern offices with local perks
Global team of 500+ professionals from 40+ countries
Continuous learning & mentorship
Career development opportunities
Relocation support (visa, transportation, housing)
Private health insurance
Performance bonuses
TradingView Premium subscription

Senior Fullstack Engineer

We are looking for a Senior FullStack Engineer to join a venture-backed startup ...

Location

Turkey , Istanbul

Salary:

Not provided

Zoolatech

Expiration Date

Until further notice

Requirements

Totally 5+ YOE as a FullStack engineer with the knowledge and experience in designing and implementing scalable, reliable systems
Backend (the main skill): Node.js, PostgreSQL, RESTful APIs
Frontend: HTML, CSS, JavaScript, Typescript, modern frameworks (React, Vue, or similar)
Experience with cloud platforms(Microsoft Azure, AWS), Docker, Kubernetes, CI/CD pipelines
Building and maintaining automated testing and deployment pipelines
SQL and database optimization (PostgreSQL preferred)
Ownership mindset and end-to-end project delivery
Startup mentality and ability to work in fast-paced environments
Problem-solving and debugging complex issues
Cross-functional team collaboration

Job Responsibility

Design, develop, and deploy core components of the AI-driven platform, ensuring scalability, security, quality and high performance
Collaborate closely with cross-functional teams to deliver rapid iterations and improvements
Make strategic technical decisions that define the architecture, tools, and frameworks used across the platform
Integrate AI and LLM-based technologies into production-ready solutions for real-time user interactions
Investigate and resolve real-world performance issues, ensuring reliability and exceptional user experience
Contribute to shaping technical culture and best practices, including mentoring and supporting future engineering hires
Take part in production support duty during daylight hours (7 AM EST – midday EST), including incidents monitoring and troubleshooting as needed

What we offer

Paid Vacation
Hybrid Work (home/office)
Sick Days
Sport/Insurance Compensation
Holidays Day Off
English Classes
Training Compensation
Transportation compensation

Senior Fullstack Engineer (JS)

We are looking for a Senior FullStack Engineer to join a venture-backed startup ...

Location

Salary:

Not provided

Zoolatech

Expiration Date

Until further notice

Requirements

Totally 5+ YOE as a FullStack engineer with the knowledge and experience in designing and implementing scalable, reliable systems
Backend (the main skill): Node.js, PostgreSQL, RESTful APIs
Frontend: HTML, CSS, JavaScript, Typescript, modern frameworks (React, Vue, or similar)
Experience with cloud platforms(Microsoft Azure, AWS), Docker, Kubernetes, CI/CD pipelines
Building and maintaining automated testing and deployment pipelines
SQL and database optimization (PostgreSQL preferred)
Ownership mindset and end-to-end project delivery
Startup mentality and ability to work in fast-paced environments
Problem-solving and debugging complex issues
Cross-functional team collaboration

Job Responsibility

Design, develop, and deploy core components of the AI-driven platform, ensuring scalability, security, quality and high performance
Collaborate closely with cross-functional teams to deliver rapid iterations and improvements
Make strategic technical decisions that define the architecture, tools, and frameworks used across the platform
Integrate AI and LLM-based technologies into production-ready solutions for real-time user interactions
Investigate and resolve real-world performance issues, ensuring reliability and exceptional user experience
Contribute to shaping technical culture and best practices, including mentoring and supporting future engineering hires
Take part in production support duty during daylight hours (7 AM EST – midday EST), including incidents monitoring and troubleshooting as needed

What we offer

Paid Vacation
Sick Days
Floating Holidays
Sport/Insurance Compensation
English Classes
Charity
Training Compensation

Senior Software Engineer - FullStack .NET Core

Elevate your expertise to new heights at 3Pillar, the premier destination for tr...

Location

Czech Republic

Salary:

Not provided

3Pillar Global

Expiration Date

Until further notice

Requirements

C#, .NET Core, MVC
Strong SQL Server background
Complex procedures debugging and bug fixing
Proficient English skills
Stakeholder management abilities
Excellent problem-solving skills and a proactive attitude towards challenges
Strong verbal and written communication skills

Job Responsibility

Facilitate effective communication with client project stakeholders regarding project status and recommendations
Craft client code that is not just efficient, but also performant, testable, scalable, secure, and of the highest quality
Actively participate in accurate planning and estimation efforts, utilizing project methods and tools
Proficiently gather requirements and organize/present developed features for clients
Execute complex activities within the current methodology and quality standards, showcasing success across diverse engagements
Promote client success across the team by collaborating with engineers, designers, and managers to understand user pain points, anticipate potential problems, and iterate on solutions that drive client success
Engage in agile software development, including daily stand-ups, sprint planning, team retrospectives, and other governance activities
Actively participate in the Engineering Practice community, mentoring others through Communities of Practice (CoPs) or on project teams, and supporting the growth of technical capabilities
Independently drive project delivery within defined architecture, demonstrating autonomy and accountability in all stages from conceptualization to deployment

What we offer

Flexible work environment
Remote-first approach
Global team
Well-being focus
Fitness offerings
Mental health plans (country-dependent)
Generous time off
Accelerated career growth and development opportunities

Fulltime

Senior Fullstack Engineer

Whatnot

Location:
China

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
February 18, 2026

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Senior Fullstack Engineer

Whatnot

Location:China

Category:IT - Software Development

Contract Type:Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:February 18, 2026

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Location:
China

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Not provided

Job Posted:
February 18, 2026