Senior Fullstack Engineer

Apollo.io is the leading go-to-market solution for revenue teams, trusted by over 500,000 companies and millions of users globally, from rapidly growing startups to some of the world's largest enterprises. Founded in 2015, the company is one of the fastest growing companies in SaaS, raising approximately $250 million to date and valued at $1.6 billion. Apollo.io provides sales and marketing teams with easy access to verified contact data for over 210 million B2B contacts and 35 million companies worldwide, along with tools to engage and convert these contacts in one unified platform. By helping revenue professionals find the most accurate contact information and automating the outreach process, Apollo.io turns prospects into customers. Apollo raised a series D in 2023 and is backed by top-tier investors, including Sequoia Capital, Bain Capital Ventures, and more, and counts the former President and COO of Hubspot, JD Sherman, among its board members.

OUR ROLE & MISSION

As a Senior Fullstack Engineer at Apollo, you will work with Apollo’s 200M+ Leads data and build features on top of it. You will be responsible for improving the quality of our data and building customer-facing products by coming up with innovative, yet simple, solutions and implementing them end-to-end. This involves building highly scalable web services, an excellent understanding of software design and databases, and a solid grasp of frontend engineering. You will be a critical part of our growing company, working on a cross-functional team to implement and drive best practices in technology, architecture, and process. In this role, you will interface with a product, design, software engineers, and members on teams outside of Engineering. At Apollo, we are obsessed with improving quality, automation, and squashing any bugs that sneak through, and we expect the same from you. You have a drive to constantly investigate performance improvements and generate innovative ideas.

OUR TECH STACK

• Frontend: React/Redux/Node.js

• Backend: Ruby/Ruby on Rails/MongoDB/Redis/Elasticsearch

• Infrastructure: Kubernetes/Docker/Ansible/Terraform in infrastructure

DAILY ADVENTURES & RESPONSIBILITIES

• Design, implement, test, deploy and iterate on end to end features in our products covering both frontend and backend

• Implement "pixel perfect" design as delivered by our designers that works across different browsers, according to specifications provided

• Produce "clean" and well-structured code, with detailed specifications and documentation

• Help maintain code quality, organization, automation and continuous delivery

• Effectively communicate development progress or blockers to the product lead, engineering manager, and other stakeholders

• Work effectively as part of a large global team

• Attend and engage in scrum ceremonies, on call, and other team-processes

• Write unit/integration tests and contribute to engineering wikis

QUALIFICATIONS

• 5+ years of industry experience in backend development and at least 3+ years in frontend development

• Solid understanding of JavaScript (ES6), React, Redux, HTML, and CSS

• Strong knowledge of backend technologies, databases (e.g., MongoDB, Elasticsearch).

• Strong system design fundamentals and experience building scalable systems

• Good understanding of software development lifecycle

• Strong analytical and problem-solving skills

• Proven software engineering skills in production environment, including test-driven development

• Your code is comprehensible, well-structured, and highly performant

Nice to have:

• Experience in Python, Ruby, Ruby on Rails,

• Experience with Sidekiq

• Experience with Cypress in writing meaningful tests

• Experience with Google Cloud Platform, Elasticsearch, Snowflake, MongoDB, Terraform, Ansible

• Understanding of Design Systems and experience using them for frontend development

Why You’ll Love Working at Apollo

At Apollo, we’re driven by a shared mission: to help our customers unlock their full revenue potential. That’s why we take extreme ownership of our work, move with focus and urgency, and learn voraciously to stay ahead.

We invest deeply in your growth, ensuring you have the resources, support, and autonomy to own your role and make a real impact. Collaboration is at our core—we’re all for one, meaning you’ll have a team across departments ready to help you succeed. We encourage bold ideas and courageous action, giving you the freedom to experiment, take smart risks, and drive big wins.

If you’re looking for a place where your work matters, where you can push boundaries, and where your career can thrive—Apollo is the place for you.