Senior Full Stack Engineer

Simple Life App; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Remote and hybrid work

Equipment provided

SIMPLE subscription

Stock options

21 days annual leave

Flexible hours

Job summary

Simple Life App is seeking a senior, product-minded engineer to join our technical marketing team. You will own initiatives end-to-end—from requirements and research to UX shaping, MVP design, architecture, and production shipping.

We value strong engineering judgment, ownership, and AI-driven coding agent strategies. You will build web apps, APIs, automation, and internal tools using Node.js, TypeScript, Python, or Go, and collaborate with marketing, product, and design to deliver reliable,

Qualifications

• 5+ years of professional software development experience with ownership of products or features.
• Strong backend skills in Node.js/TypeScript, Python, or Go with depth in one and flexibility across others.
• Hands-on frontend experience with React, Vue, or similar frameworks.
• Practical UX expertise and UI design skills: user flows, prototyping, usability, and visual consistency.
• Strong system design skills: architecture, data modeling, APIs, integrations, reliability, and scalability.
• Deep understanding of AI coding agents and agent infrastructure: context management, tool integrations, and validation of changes.

Responsibilities

• Own initiatives: clarify requirements, research options, define MVP scope, and deliver working solutions.
• Build web applications, APIs, automation, and internal tools using Node.js, Python, or Go.
• Create clear user flows, prototype interfaces, and turn ideas into intuitive, well-designed products.
• Make architectural decisions and balance delivery speed, reliability, and maintainability.
• Configure and improve agent-powered development workflows, integrations, and automated checks.
• Collaborate with marketing, product, and design; own testing, deployment, releases, and improvements after launch.

Skills

Node.js / TypeScript

Python

Go

React

UX design

System design

AI coding agents

SQL

Git

CI/CD

Cloud infrastructure

Tools

Git

CI/CD

Cloud infrastructure

Job description

Simple Life is the #1 AI-powered health coaching app for adults who want to lose weight and enjoy a healthier lifestyle-without the stress or extremes. Our mission is to empower people to feel their best every day. By challenging traditional, restrictive approaches, Simple offers a more sustainable method grounded in ease, personalization, and real-life support.

Simple has had over 17 million downloads and more than 300,000 5-star reviews, having helped millions lose weight successfully and sustainably. Simple has earned recognition as Best Virtual Coach and one of the Top 100 AI companies — all thanks to a dedicated global team driving real impact.

With SIMPLE as a partner in their pocket, users feel cared for and empowered to embrace - and stick to - new healthy habits. To learn more, visit simple.life.

We’re looking for a senior, product-minded engineer to join our technical marketing team and build web products, growth tools, integrations, and automation.

You’ll own initiatives end to end-from gathering requirements and researching solutions to shaping the UX, defining an MVP, designing the architecture, and shipping to production. We value strong engineering judgment, proactive ownership, and effective use of AI coding agents over a specific stack.

What You’ll Do

• Own initiatives: clarify requirements, research options, define MVP scope, and deliver working solutions;
• Build web applications, APIs, automation, and internal tools using Node.js, Python, or Go;
• Create clear user flows, prototype interfaces, and turn ideas into intuitive, well-designed products;
• Make architectural decisions and balance delivery speed, reliability, and maintainability;
• Configure and improve agent-powered development workflows, integrations, and automated checks;
• Collaborate with marketing, product, and design; own testing, deployment, releases, and improvements after launch.

What We’re Looking For

• 5+ years of professional software development experience, with proven ownership of products or substantial features;
• Strong backend skills in Node.js / TypeScript, Python, or Go—depth in one and flexibility across others; all three are not required;
• Hands-on frontend experience with React, Vue, or similar frameworks;
• Practical UX expertise and UI design skills: user flows, prototyping, usability, and visual consistency;
• Strong system design skills: architecture, data modeling, APIs, integrations, reliability, and scalability;
• Deep understanding and hands-on experience with AI coding agents and agent infrastructure: context management, tool integrations, task orchestration, and validation of generated changes
• Experience turning loosely defined problems into production-ready solutions—not just implementing predefined tickets;
• Solid knowledge of SQL, relational databases, Git, CI/CD, and cloud infrastructure;
• Proactive execution, clear communication, and English for documentation and teamwork.

Nice To Have

• Experience with marketing technology, analytics, experimentation, or growth engineering.

Perks And Benefits

• Open-minded teams, a welcoming and inclusive company culture, plus the opportunity to make a real difference with a game-changing health tech product.
• A competitive salary package based on your unique expertise, skillset, and impact on the product plus stock options.
• Remote and hybrid work opportunities.
• The equipment whatever you need to be happy and productive.
• A premium SIMPLE subscription.
• 21 days annual leave, plus bank holidays (those observed where you live).
• Flexible hours. We focus on your results, not how long you spend at your desk.

About Our Values

Think deeper: We understand that in order to grow we need to make all our decisions reality-based and change our opinion based on what we learn. We appreciate data coming in various forms – quantitative and qualitative, feedback from users and colleagues, and strong and weak signals.We treat data as the main source for leveraging insights and expect people at every level to have conversations that start with data.

Focus on impact: Results and speed matter. When we are competing to become an A-player in the digital health market, we don’t have the luxury of deliberation. We need to make decisions and changes quickly and, swiftly learn from our mistakes.We prioritize what will have the greatest impact and aren’t distracted by anything else. We create products that benefit users while we are meeting our metrics.

Take ownership: We seek to improve all facets of our company even in ways beyond our job description. We seek and take responsibility for our actions and their impact. We value and set high expectations for our own work so that it can add to the overall quality and innovation results of the team. Each one of us is empowered to make this company a success, take the lead to resolve disagreements and systemic issues.

Push the limits: We encourage our team to explore new ideas, challenge conventional thinking, and continuously improve work. This mindset can lead to breakthroughs in product development, improved operational efficiency, and increased competitiveness in the market. We believe that a culture and mindset of constantly striving to exceed existing standards, boundaries, or expectations that include innovation, experimentation, and a willingness to take risks, can bring us success. We don't accept what someone says as truth if we disagree with it, no matter what authority that person has in the company and express ourselves directly, not through back channels. We challenge ideas, from policy to product decisions, and always seek to understand the reason behind what we do.

Be a Championship Team: As a part of the championship team, you must improve your own performance constantly also know your teammates, their talents and skills and be focused on a common goal and how to achieve it together. We hold each other accountable for our contribution to the shared success or failure, and we constantly look for ways to help our colleagues to improve and for us to perform better as a team. We collaborate within the team in order to compete with challengers in the outside world. We build relationships of trust. We provide our teammates with the autonomy and support they need to deliver their part of the goal.