Senior Fullstack Engineer Remote, Poland

Apollo; Snowflake (AZ); Remote; USD 100,000 - 160,000; Full time

Job summary

Apollo.io is seeking a Senior Fullstack Engineer to enhance their 200M+ Leads data. In this role, you will build scalable solutions and collaborate in a cross-functional team to drive technology and architectural best practices. This position demands a strong background in both backend and frontend development, with a focus on performance improvement and innovative problem-solving.

Qualifications

• 6+ years of industry experience in backend and frontend development.
• Strong system design fundamentals.
• Proven experience leveraging AI tools in software development.

Responsibilities

• Design, implement and test end-to-end features in products.
• Produce clean and well-structured code.
• Communicate development progress effectively.

Skills

Backend development

Frontend development

System design

Analytical skills

Problem-solving skills

Tools

MongoDB

Redis

Elasticsearch

Ruby on Rails

Job description

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.

**This is a Permanent EoR role and not a B2B Contract**

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

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

DAILY ADVENTURES & RESPONSIBILITIES

• Design, implement, test, deploy and iterate on end to end features in our products covering both frontend and backend
• Produce "clean" and well-structured code with detailed specifications and documentation
• 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, oncall, and other team processes
• Write unit/integration tests and contribute to engineering wikis

QUALIFICATIONS

• 6+ years of industry experience in backend development and at least 5+ years in frontend development
• 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
• Proven experience leveraging AI tools to enhance software development processes, including code generation, debugging, and productivity optimization. Candidates should demonstrate fluency in integrating AI-driven solutions into their workflows and a willingness to stay current with emerging AI technologies.

Nice to have:

• Experience in Python, Ruby, Ruby on Rails,
• Experience with Sidekiq
• Experience with Cypress in writing meaningful tests
• Experience with Spark or other distributed processing frameworks
• Experience with Google Cloud Platform, Databricks, Snowflake, MongoDB, Terraform, Ansible
• Understanding of Design Systems and experience using them for frontend development

We are AI Native

Apollo.io is an AI-native company built on a culture of continuous improvement. We’re on the front lines of driving productivity for our customers—and we expect the same mindset from our team. If you're energized by finding smarter, faster ways to get things done using AI and automation, you'll thrive here.

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 toown 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.

Interested in building your career at Apollo.io? Get future opportunities sent straight to your email.

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