Junior Back End Developer (Ruby)

Sensor Tower Inc.; City of Westminster; On-site; GBP 30,000 - 45,000; Full time

Job summary

A leading market intelligence firm in the UK is seeking a Junior Back End Developer to build and maintain high-performance data pipelines and collaborate across teams. This role emphasizes quality code, ownership of project goals, and proactive problem-solving. Candidates should be proficient in Ruby on Rails or Python, and possess a portfolio showcasing software development capabilities. The position offers flexible time off and wellness stipends.

Benefits

Flexible time off

Health and wellness stipend

Monthly internet stipend

One-time home office stipend

Qualifications

• Portfolio of meaningful GitHub contributions or interesting personal projects.
• Proactive approach to problem-solving.
• Strong grasp of algorithms and data pipelining.

Responsibilities

• Build and maintain high-performance pipelines for data analysis.
• Participate in the complete development lifecycle.
• Collaborate with cross-functional teams to design systems.

Skills

Ruby on Rails

Python or similar languages

Data analysis

RESTful systems

API design

Curiosity

Tools

ClickHouse

MongoDB

Sidekiq

Job description

At Sensor Tower, we don't just want you to write code; we want you to build the technical and product ownership that makes your work meaningful. We are looking for a talented Junior Back End Developer to join a high‑priority strategic initiative.

In this role, you will build systems to track and analyze how major conversational Large Language Models (LLMs) perceive apps, brands, and digital entities. You will join a high‑performing team to launch and quickly iterate on this new product, with high expectations for your work paired with a strong emphasis on fast career development and growth.

• Build New Insights Features: Build and maintain reliable, high‑performance pipelines to aggregate and analyze data from various AI models.
• Own the Full Development Lifecycle: Participate in the complete development lifecycle through design, implementation, and release; own follow‑up to eliminate tech debt.
• Collaborate Cross‑Functionally: Work closely with cross‑functional teams to understand the end‑to‑end process and design the correct systems.
• Drive Future Strategy: Work on additional strategic engineering projects to continuously make a business impact and grow our footprint.
• Preferred: Ruby on Rails and the broader Ruby ecosystem; alternatively, demonstrate proficiency in Python or similar languages and willingness to cross‑train in Ruby.
• Nice‑to‑have: Experience with ClickHouse or other OLAP databases; MongoDB or other document stores; Sidekiq or other asynchronous task runners.
• Technical Foundation: Strong grasp of algorithms, RESTful systems, and API design; experience with data analysis and data pipelining is ideal.
• Github/Portfolio: A portfolio of meaningful GitHub contributions, open‑source work, or interesting personal projects that demonstrate you can build working software.
• Curiosity & Drive: A proactive approach to digging into sources yourself rather than relying on second‑hand information, and an eagerness to understand why a project is valuable before you start coding.

Engineering Culture

• Simplicity: We avoid over‑engineering. We prefer the tools we already have and the most straightforward solutions over "shiny new toys."
• Quality: We write code that is a pleasure to read because we know code is written once but read many times. We polish to a high level before shipping.
• Extreme Ownership: We don't just do the minimum. We expect you to understand the "why" behind your work and own the ultimate goal of fixing problems at their root cause, avoiding temporary band‑aids.
• Prioritization: We focus relentlessly on what is important, not just what is urgent.

We don't want you to be here just for a job. We want you to enjoy the problems we solve and want to make an impact. If you are ready to do high‑quality work, focus relentlessly on the most important priorities, and grow your career by solving hard problems, we want to hear from you.

About Sensor Tower

Sensor Tower cultivates responsibly sourced market intelligence that provides visibility into the trends shaping the global digital economy. Our customers use these insights to help them make better business decisions.

Benefits

• Flexible time off so employees can shape their time away from work.
• Health and wellness stipend to achieve and maintain a healthy lifestyle through physical and mental fitness.
• Monthly internet stipend and a one‑time $500 home office stipend.

We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, and veteran status. We will consider qualified applicants with arrest and conviction records. If you have a disability or special need, please do not hesitate to let us know and we'll do our best to accommodate.