Senior Full-Stack Software Engineer (Ruby on Rails) #1148

Decisiv Inc•Remote, US,

3d•Remote

About The Position

Decisiv is hiring a Senior Full-Stack Software Engineer to help build the next generation of their Service Relationship Management platform. They are looking for engineers who combine strong fundamentals with modern leverage to ship more, reason about whole systems, and operate at a high level. The role emphasizes systems thinking, a high bar for quality and reliability at scale, and treating the toolchain as a competitive advantage. Engineers will own complex problems end-to-end, modernize legacy systems, and ship features impacting real-world operations. The position is for individuals excited by a new way of building software where senior engineers act as systems designers and orchestrators.

Requirements

BS/BA or equivalent experience
6+ years building production web applications
3+ years with Ruby on Rails in production
Deep, current experience with Ruby on Rails in production environments
Strong proficiency with relational databases, PostgreSQL preferred, including schema design, indexing, and query performance
Experience integrating modern front-end frameworks (React, Vue, Angular, or similar) with Rails back ends
Strong API design and implementation skills (REST, JSON:API, OpenAPI; GraphQL a plus)
Working knowledge of AWS, Docker, GitHub, and CI/CD pipelines
Practical experience with testing (RSpec, Capybara), performance tooling, observability, and production debugging
Modern tooling fluency: evolved workflow to take advantage of the latest generation of developer tooling with well-formed opinions
Systems thinking: instinctively reason about end-to-end behavior, integration points, failure modes, and second-order effects of design choices
High agency and ownership: take loosely-defined problems and drive them to shipped, operating outcomes, and stay accountable when things break
Quality judgment under leverage: move quickly without lowering the bar, reviewing own work and tool work with rigor
Clear written communication: explain technical decisions and tradeoffs precisely enough for teammates, stakeholders, and toolchain to act on
Travel – 5%
Must reside in the United States due to travel requirements
Eligible to work in the United States
Not able to sponsor work visas

Nice To Haves

Hands-on experience building on top of large language models: evaluations, agent orchestration, or retrieval systems in production
Experience with Python and Java
Knowledge of data engineering, ELT pipelines, or analytics platforms
Background in API analytics, anomaly detection, or trend-based error analysis
Open-source contributions or a strong public engineering portfolio
Domain experience in commercial vehicle, fleet, logistics, or industrial software

Responsibilities

Own outcomes end-to-end, taking features from problem definition through design, implementation, rollout, and operation across database, API, and front-end layers.
Build with leverage, using the modern toolchain to compound output, frame problems for efficient attack, and supervise/review work end-to-end.
Reason about systems, not just code, understanding data flow, failure modes, performance characteristics, and operational behavior.
Drive platform reliability and developer productivity by improving runtime systems, tooling, observability, and feedback loops.
Modernize and extend legacy services for stability, performance, and scalability while delivering new capabilities.
Design durable APIs and integrations, shaping REST/JSON:API/OpenAPI contracts and front-end integrations.
Collaborate cross-functionally with product, design, and other engineers, participating in sprint planning, code reviews, and architecture discussions.
Write clear specs, ADRs, PR descriptions, and runbooks.
Mentor other engineers, model strong high-leverage workflows, and contribute to software building practices.
Participate in the on-call rotation for systems owned by the team.