Senior Software Engineer, Growth
**This is a Permanent role ("Umowa o pracę") and not a B2B contract**
As a Senior Software Engineer on the Growth team, you will be a critical part of our growing company, working at the intersection of engineering, product, marketing, and data science to accelerate product growth through rapid experimentation, data analysis, and scalable technical solutions. You’ll implement and drive best practices in technology, architecture, and process while optimizing funnels, automating growth loops, and shipping features that drive measurable impact.
You’ll have the chance to work in an open and collaborative environment, receive and give hands-on mentorship, and have opportunities to grow and accelerate your career. You love both learning and teaching, enjoy working cross-functionally to solve hard problems, and strive for quality — obsessing over automation, performance, and squashing any bugs that sneak through.
Our tech stack: Ruby/RoR, React.js, TypeScript, Redux, Node.js, Python, MongoDB, Elasticsearch, Ansible, Terraform, Grafana, Kibana, Docker, Kubernetes, AWS/GCP, GitHub Actions.
Daily Adventures and Responsibilities
Develop and execute engineering strategies that enable rapid experimentation and data-driven decision-making
Collaborate cross-functionally with Product, Design, Marketing, Data Science, and Engineering to optimize key growth metrics and contribute to core product initiatives
Architect and build scalable systems that support growth initiatives, such as onboarding flows, personalization engines, and viral loops
Implement A/B testing and data instrumentation to ensure accurate tracking and measurement of experiments
Leverage automation and machine learning to optimize user engagement, reduce churn, and personalize user experiences
Produce clean, well-structured, well-documented code and implement pixel-perfect designs that work across browsers, per spec
Help maintain code quality, organization, automation, and continuous delivery
Ensure technical excellence through best practices in performance optimization, security, and scalability
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 stand-ups, team meetings, and manager 1:1s
Give and receive constructive feedback and praise
Competencies
Proactively acts without being told what to do; identifies areas of improvement and drives best practices to deliver high-quality, performant, scalable solutions
Takes ownership over everything shipped
Communicates effectively, clearly, and concisely — technical and non-technical, written and verbal — and actively listens to ensure understanding
Helps teammates overcome obstacles, resolve blockers, and complete work; shares credit where due
Actively seeks out and acts on feedback as a tool for growth
Confident in owning their role and bringing creative ideas to users
Excellent leadership and stakeholder management skills
Comfort with ambiguity and a bias toward action; obsession with metrics (LTV, CAC, retention) and rapid iteration
Skills & Relevant Experience
Proven experience leveraging AI tools to enhance software development (code generation, debugging, productivity optimization), with fluency integrating AI-driven solutions into your workflow and a willingness to stay current with emerging AI technologies
BS in Computer Science, or equivalent
Minimum 5 years of industry experience in frontend or full-stack development, building large-scale applications
Proficiency in JavaScript (ES6)/TypeScript, React, Redux, HTML, CSS, and at least one backend language (Ruby/RoR, Python, or Node.js)
Experience with cloud infrastructure (AWS/GCP) and REST APIs
Experience with analytics tools (Amplitude, Mixpanel, Google Analytics) and A/B testing platforms (e.g., Optimizely, LaunchDarkly, Segment)
Familiarity with growth frameworks (e.g., Pirate Metrics, viral loops)
Strong UX and product sense, with the ability to negotiate the right MVP
Strong attention to detail; interest in building UI with performance, accessibility, and scalability in mind
Nice-to-Haves
Experience with growth at a startup or scaling product
Knowledge of SEO, CRM tools (Braze, HubSpot), or marketing automation