Staff Software Engineer

Affinity.co

. Set and own the technical direction for a core product domain .

Posted 9/18/2026full-timeRemote • CanadaLeadWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates extensive experience in full-stack software engineering, with a strong focus on technical leadership, system design, and performance optimization. Proficient in leveraging AI-assisted development tools to enhance productivity and product quality.

Highest-signal resume keywords

Technical LeadershipFull-Stack Software EngineeringAI-Assisted Development ToolsSystem Design and Performance OptimizationComponent-Based Interface Development

ATS Keywords

Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills

Full-Stack EngineeringRubyPostgreSQLReactTypeScriptOOP PracticesRelational DatabasesSystem DesignPerformance DiagnosisAI Tool Evaluation

Soft Skills

JudgmentMentorshipCollaboration

Tools & Technologies

Claude CodeCursorCopilot

Industry Keywords

Technical DirectionOperational HealthDeveloper VelocityDesign ReviewsCode Reviews

Tech Stack

Tools & technologies

PostgresReactRubyTypeScript

About the role

Key responsibilities & impact

Set and own the technical direction for a core product domain
Make and defend architecture, sequencing, and tradeoff decisions
Lead complex, multi-quarter initiatives end to end
Break ambiguous problems into work other engineers can execute
Partner with product and design from problem definition through delivery
Shape what gets built and how it gets built
Raise the technical bar through design reviews, code reviews, and mentorship
Identify and advocate for investments in reliability, performance, and developer velocity
Own operational health, performance, observability, and on-call for the domain
Work with AI development tools and help the team use them effectively
Work across the stack, including backend data models and asynchronous processing, frontend design systems, and rich visualizations
Report to the Senior Engineering Manager

Requirements

What you’ll need

10+ years building and shipping production software as a full-stack engineer
Track record of technical leadership on ambiguous, high-stakes projects
Demonstrated impact beyond the candidate's own team
Strong server-side experience with modern OOP practices
Experience with Ruby and PostgreSQL, or deep expertise in a comparable stack and motivation to learn Affinity's stack
Experience building component-based interfaces with React and TypeScript
Deep understanding of relational databases
Experience designing systems that scale and diagnosing performance bottlenecks
Practical fluency with AI-assisted development tools such as Claude Code, Cursor, Copilot, or similar
Good judgment about AI tool use, reviewing generated output, and associated risks
Ability to deliver high-quality products and champion technical excellence
Nice to have: experience building product features on top of LLMs or agent frameworks, including evaluation and monitoring
Nice to have: experience in a company where AI-assisted development was the norm
During live interviews, no use of AI is permitted unless otherwise stated

Benefits

Comp & perks

AI fluency investment and assessment as part of how the company works
Permission to use AI when shaping applications or preparing for interviews
Remote work arrangement