A Software Engineer at SpotOn: Corporate plays a pivotal role in building and scaling the next generation of financial technology and merchant solutions. SpotOn empowers mid-market and enterprise businesses—ranging from high-volume restaurants to multi-location retail brands—by providing robust Point-of-Sale (POS) systems, secure payment processing, and comprehensive business management tools. As an engineer here, you will directly influence products that process billions of dollars in transactions, requiring your code to be highly performant, secure, and fault-tolerant.

The engineering organization at SpotOn operates at a massive scale, tackling complex challenges in distributed systems, real-time data processing, and seamless user experiences. Whether you are optimizing a backend microservice in Go or Python, or crafting a highly responsive web interface in React and TypeScript, your contributions will directly impact the daily operations of hundreds of thousands of merchants. The work is fast-paced and highly collaborative, demanding a balance of deep technical expertise and strong product intuition.

To succeed as a Software Engineer at SpotOn: Corporate, you must be comfortable navigating a rapidly growing, globally distributed engineering ecosystem. You will collaborate closely with product managers, UX designers, and system architects across different time zones to translate complex business requirements into elegant technical solutions. The role is ideal for engineers who thrive on ownership, enjoy solving ambiguous problems, and are passionate about building products that drive real-world economic impact.

The following questions are representative of what you can expect during the SpotOn: Corporate interview process. These questions are drawn from real candidate experiences and are designed to evaluate both your technical depth and your alignment with our engineering culture. Use these examples to identify core patterns in how we assess problem-solving, architectural thinking, and communication.

Coding & Algorithm Fundamentals

This category evaluates your core programming skills, understanding of data structures, and ability to write clean, maintainable code under time constraints.

• Write a function that takes an array and returns a new array with all duplicate elements removed.
• Given a paragraph of text, write an algorithm to count the frequency of each word and return the top results.

Preparing for an interview at SpotOn: Corporate requires a balanced approach that covers technical execution, architectural thinking, and behavioral alignment. We want to see how you think, how you code, and how you collaborate with others to build great products.

Role-Related Knowledge – You should have a strong command of the primary technologies required for your target track. For backend-focused roles, this means deep familiarity with Python or Go, including concurrency patterns and database optimization. For full-stack or frontend roles, expect to demonstrate advanced proficiency in React and TypeScript, including state management and rendering performance.

Problem-Solving & Coding Execution – We value clean, readable, and efficient code. During coding assessments, focus on explaining your thought process out loud before writing any code. We want to see how you structure your solutions, handle edge cases, and optimize for both time and space complexity.

System Design Capabilities – As a Software Engineer, you must understand how individual components fit into a larger ecosystem. Be ready to discuss API design, caching strategies, database scaling, and microservices architecture. Focus on justifying your design choices based on specific trade-offs rather than just listing technologies.

Culture & Collaborative Fit – SpotOn is a highly collaborative, global organization. We look for engineers who are humble, eager to learn, and capable of constructive pair-programming. Show us how you communicate technical concepts clearly, how you handle feedback, and how you align your technical decisions with business goals.

The interview process at SpotOn: Corporate is designed to comprehensively evaluate your technical capabilities and cultural alignment while giving you a clear understanding of our team structure and product vision. Because our engineering teams are highly distributed across the United States, Europe, and Latin America, the coordination of your interviews may involve stakeholders from multiple regions.

The process typically begins with an initial recruiter screen to align on experience and expectations, followed by a hiring manager conversation. From there, candidates transition into a technical assessment phase, which may include a take-home project or a live technical interview. The final stage consists of deep-dive technical loops and behavioral discussions with senior engineering staff.

The timeline above outlines the standard progression of our hiring funnel from the initial application to the final decision. While we aim to keep the process streamlined and highly communicative, the exact duration can vary depending on the specific team, role level, and regional scheduling constraints. Candidates should use this timeline to pace their preparation, ensuring they allocate sufficient time to practice coding fundamentals before entering the technical stages.

To pass the technical bar at SpotOn: Corporate, you must demonstrate strong execution across several distinct evaluation areas. Our interviewers look for consistent signals that prove you can write production-ready code and design scalable systems.

Core Coding and Language Proficiency

This area evaluates your practical programming skills and your familiarity with the language of your choice. We want to see that you understand not just basic syntax, but also the idioms, performance characteristics, and best practices of the language.

Be ready to go over:

• Language-specific paradigms – Concepts such as closures in JavaScript, concurrency models in Go (goroutines/channels), or memory management and decorators in Python.
• Data structure manipulation – Efficiently filtering, mapping, and transforming arrays, hashes, and custom data structures.
• Code cleanliness and readability – Writing self-documenting code with clear variable names, modular functions, and logical structure.
• Advanced concepts (less common) – Low-level memory management, custom middleware implementation, and optimization of third-party library dependencies.

Example scenarios:

• Writing a React component in a single file without IDE assistance, ensuring proper state lifecycle and event handling.
• Implementing an algorithm to process a stream of text data and output formatted metrics efficiently.

System Design & Architecture

For senior and mid-level roles, we evaluate your ability to design scalable, reliable systems that can support our growing merchant ecosystem. We want to see how you break down complex, ambiguous problems into manageable services.

Be ready to go over:

• API Design – Designing clean, RESTful or gRPC APIs that are intuitive for other developers to consume.
• Database Strategy – Choosing between SQL and NoSQL databases, designing schemas, and planning for data consistency and scaling.
• Distributed Systems Patterns – Implementing caching layers, message queues (e.g., Kafka, RabbitMQ), and load balancing to ensure high availability.
• Advanced concepts (less common) – Event sourcing, CQRS patterns, and designing for zero-downtime database migrations in high-volume transaction environments.

Example scenarios:

• Designing the backend architecture for a URL shortening service, focusing on write-heavy vs. read-heavy traffic optimization.
• Creating a low-level class design for a point-of-sale checkout flow, detailing how discount engines and payment gateways interact.

Collaborative Problem Solving

We rarely work in isolation at SpotOn. This evaluation area focuses on how you collaborate with other engineers, accept feedback, and navigate ambiguity during pair-programming or system design sessions.

Be ready to go over:

• Pair-programming dynamics – Working through a coding challenge alongside an interviewer, treating them as a collaborative partner rather than an evaluator.
• Handling feedback – How you react when an interviewer points out a bug, an edge case, or an alternative architectural approach.
• Technical communication – Explaining complex technical decisions in simple, clear terms to both technical and non-technical stakeholders.

Example scenarios:

• Debugging a failing test case in a take-home project during a live review session with two SpotOn engineers.
• Discussing the architectural trade-offs of a proposed database schema change during a system design interview.

As a Software Engineer at SpotOn: Corporate, your daily work will span the entire software development lifecycle, from initial product discovery to deployment and monitoring.

• Write high-quality code – Develop, test, and maintain robust software solutions using Python, Go, TypeScript, or React, ensuring alignment with internal coding standards and architectural guidelines.
• Collaborate across functions – Partner closely with product managers, designers, and QA engineers to define feature specifications, technical requirements, and delivery timelines.
• Design scalable systems – Contribute to the design and evolution of our microservices architecture, ensuring our systems remain performant as our merchant base grows.
• Participate in code reviews – Conduct thorough, constructive code reviews to maintain high code quality, share knowledge, and mentor junior team members.
• Maintain operational excellence – Monitor, debug, and optimize production systems, participating in on-call rotations and incident post-mortems to continuously improve system reliability.