Senior Software Engineer

Summary

Join Proper, a rapidly growing startup, as a Senior Software Engineer! You will build workflow automation and productivity tools, primarily focusing on automating accounting processes within a B2B environment. This role requires 8+ years of full-stack development experience, proficiency in various programming languages (Python, Java, JavaScript, etc.), and expertise in frontend and backend technologies (React.js, Node.js, etc.). The ideal candidate thrives in a fast-paced setting, prioritizing collaboration and high-quality software development. Experience in high-growth startups and larger tech companies is preferred. Proper values a culture of collaboration, respect, and personal growth.

Requirements

• Proven ability to work across frontend, backend, and database systems
• Experience with multiple languages, including Python, Java, JavaScript, Golang, Rust, Erlang, or TypeScript
• Strong experience with React.js or Vue.js
• Proficiency with Node.js or similar backend technologies
• Familiarity with AWS, GCP, or Azure
• Experience building tools that improve efficiency for businesses
• Moves with urgency – ensures rapid progress without sacrificing quality
• Problem solver – enjoys tackling challenges and finding pragmatic solutions
• Bias for action – ships solutions quickly, learns from feedback, and iterates fast
• Agile mindset – values speed of execution, iteration, and continuous improvement
• Strong communicator – able to collaborate effectively with engineers, users, and product teams
• Team player – works well in cross-functional environments, prioritizing collaboration
• High standards for software quality – balances speed with best practices for maintainability and scalability
• Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field (or equivalent experience)
• 8+ years of professional experience in software engineering
• At least 2 years in a US-based startup
• 2–3 years at a larger tech company with strong engineering standards

Responsibilities

• Develop and maintain full-stack applications with a focus on workflow automation and productivity tools
• Write clean, scalable, and maintainable code in languages such as Python, Java, JavaScript, Golang, Rust, Erlang, or TypeScript
• Build robust frontend applications using React.js or Vue.js
• Architect and implement backend services using Node.js or similar technologies
• Work closely with Product and Design teams to translate business requirements into scalable technical solutions
• Improve automation in financial and accounting workflows, streamlining data processing and integrations
• Ensure high availability and performance of critical applications
• Establish and track engineering KPIs such as feature delivery velocity, system uptime, and code quality metrics
• Monitor and optimize application performance, ensuring minimal downtime
• Continuously improve developer experience through better tooling and automation
• Mentor junior and mid-level engineers, helping them grow in their careers
• Contribute to internal documentation and knowledge sharing
• Lead technical discussions, code reviews, and best practice adoption across the engineering team

Preferred Qualifications

• Experience in high-growth startups (10-15 engineer teams) and larger tech companies
• Knowledge of serverless architectures and microservices
• Familiarity with RPA, machine learning or AI-driven automation
• Experience working in a B2B SaaS environment
• Understanding of financial automation and accounting workflows