Senior Backend Engineer

WHO WE ARE

We’ve been obsessed with brains. We believe everyone deserves a sharper, healthier mind. More than 100 million people turn to Lumosity to boost focus, strengthen memory, and think faster — making brain training part of their everyday lives. We also support the Human Cognition Project, collaborating with over 90 university partners to advance research in cognitive training.

We’re here to do the best work of our lives — building products that make minds sharper and healthier. Join us and help shape the future of brain health.

WHAT WE’RE LOOKING FOR

In this role, you’ll work closely with fellow engineers to design and build software at scale, reaching a large consumer audience. You’ll also collaborate with product managers, designers, scientists, and other stakeholders. We’re looking for someone with a strong history of shipping successful products and a genuine passion for cognitive health and wellness.

KEY RESPONSIBILITIES

Lead by example through high-quality, scalable code that solves complex problems.

Contribute and influence system-level architecture and design decisions, working collaboratively with team members

Design, implement and own scalable distributed systems that meet maintainability, scalability and performance demands

Lead the definition of implementation details (the “how”) by working with engineering teammates

Build and scale systems using our core stack : Node.js, TypeScript, GraphQL, Postgres, Kafka, AWS (Lambda, EKS, RDS)

Collaborate on technical specifications and implementation plans

Partner with product managers and stakeholders to define precise product requirements

Champion best engineering practices and propose strategies for continued improvement

Participate in agile processes and continuously evolve them for better efficiency

Mentor and guide junior engineers through code reviews, technical discussions, and knowledge sharing

Lead cross-team initiatives to define and standardize architectural patterns that enhance system scalability and resilience

WHO YOU ARE

A developer at heart with a knack for clean, maintainable, well-documented code that aligns with modern standards

A system thinker capable of designing and evolving high-level architecture

Self-starter — motivated to take initiative and own outcomes end-to-end

Collaborative team player who thrives in small teams

A continuous learner — willing to evolve technically and professionally

Empathetic communicator — respects diverse perspectives and communicates ideas clearly

Risk-aware — proactively identifies and mitigates technical or architectural risks

Comfortable navigating ambiguity, and excited to bring clarity

Passionate about creating meaningful, user-centric products

A technical leader who can guide architectural decisions and mentor teammates

Share the same vibe as we do

WHAT YOU HAVE

7+ years of backend development experience in production environments

Proven experience with distributed systems and system design principles

Skilled in building Microservices, RESTful, and GraphQL APIs using modern tech stacks

Strong working knowledge of relational (e.g., Postgres) and non-relational databases

Proficient in Node.js, TypeScript, or similar backend languages

Familiarity with modern CI / CD tools and automation pipelines

Solid experience using AWS, particularly with Lambda, EKS (Elastic Kubernetes Service), RDS (Relational Database Service), and other cloud-native services

Strong ability to analyze and convert business requirements into scalable technical solutions

Proven track record in shipping performant, scalable software used by large audiences

Prior startup experience is a bonus

Experience driving cross-functional technical efforts and setting long-term architectural direction

Proven ability to mentor and support the growth of junior and mid-level engineers

Deep expertise in performance tuning and scaling distributed backend systems

WHAT WE OFFER

The excitement and flexibility of an early-stage startup with the stability of a mature business

Competitive salary

AI is in our DNA. From Cursor to ChatGPT, v0 to Claude, we use cutting-edge tools to focus on the things that matter

Hybrid work model : 3 days a week in office, designed for deeper collaboration and the fun of working side-by-side. Expect spontaneous whiteboard sessions, team lunches, and regular board-game hangouts

Flexible paid time off

Comprehensive, company-sponsored medical insurance (including spouse, children and parents / in-laws)

Annual learning stipend for courses, books, and upskilling

Office commute expense reimbursement and a location just a short walk from the nearest metro

Set in a lively neighborhood with plenty of cafés and hangout spots to explore after work

Monthly fitness / wellness reimbursements

Catered lunches and a fully stocked pantry — complete with the real MVP : strong South Indian filter coffee. And a library nook stacked with books you’ll actually want to read

Free Lumosity Family subscription — finally, a way to settle once and for all who’s the real genius in the family