Senior Software Engineer

Escher Group

. Lead the design and delivery of one area of the Product Journey Engine platform .

Posted 10/9/2026contractBoston • Massachusetts • United StatesSenior💰 $110,000 - $140,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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

Demonstrates expertise in leading the design and delivery of complex software components, with a strong focus on .NET and TypeScript development, automated testing, and contract-driven design. Capable of mentoring developers and ensuring high-quality code through reviews and adherence to specifications.

Highest-signal resume keywords

C#/.NET DevelopmentTypeScript Application DevelopmentAutomated Testing OwnershipContract-Driven DesignCI/CD Pipeline Experience

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

C#ASP.NETTypeScriptJSONJSON SchemaWebAssembly.NET CoreJavaScriptGitCI/CD

Soft Skills

MentoringTroubleshootingSpecification Analysis

Tools & Technologies

Azure DevOpsGitHub ActionsJIRA

Certifications & Qualifications

Post-Secondary Education in Computer Science or Software Engineering

Industry Keywords

Journey EnginePOS SystemsTransactional SystemsWorkflow EngineRules Engine

Tech Stack

Tools & technologies

AzureJavaScriptReactTypeScript.NET

About the role

Key responsibilities & impact

Lead the design and delivery of one area of the Product Journey Engine platform
Work from the runtime specification with the Chief Architect
Own contracts between the engine and host and with the Designer, including versioning and the cost of breaking them
Troubleshoot and resolve technical issues across the engine/host boundary
Own the automated testing story for the area
Translate requirements and specifications into designs and JIRA stories
Challenge specifications when they are wrong or incomplete
Mentor other developers and participate in code reviews
Journey Engine: lead a .NET runtime cross-compiled to WebAssembly and embedded in a TypeScript application
POS Host Runtime: lead a TypeScript applet running journeys inside a third-party ePOS solution, driving peripherals, handling suspend/resume, and delivering results to the till basket exactly once

Requirements

What you’ll need

Post-secondary education in Computer Science or Software Engineering
Substantial experience leading the delivery of a non-trivial component or service, end to end
Strong in C#/.NET or TypeScript, with working ability or willingness to learn the other
Experience with JSON, JSON Schema and contract-driven design between components
Comfortable owning automated testing of their own work
Comfortable building from a written specification and identifying incorrect or incomplete specifications
Understanding of performance, traceability, and security as first-class concerns
Experience building reusable libraries or SDKs consumed by others
Experience with Git workflows and CI/CD pipelines, including Azure DevOps or GitHub Actions
Able to meet the security clearance requirements of the target Escher client
Journey Engine applicants: experience with a workflow engine, rules engine, state machine, or similar execution runtime; deterministic evaluation, immutability and idempotency; .NET in constrained environments; sandboxing user-authored expressions or scripts; POS, payments, or transactional systems experience
POS Host Runtime applicants: experience architecting large multi-component JavaScript/HTML applications; embedded or hosted JavaScript applications; browser platform knowledge; integrating hardware peripherals or device services from a browser or embedded runtime
.NET/C#/.NET Core and TypeScript/JavaScript
Experience with .NET/JavaScript interoperability is a plus
Journey Engine: WebAssembly experience is a strong plus but not required
POS Host Runtime: exposure to WebAssembly or other compiled-to-browser runtimes; React and Material Design are a plus

Benefits

Comp & perks

Competitive compensation package
Training opportunities
Free coffee and snacks when in the office
Support of an experienced leadership team
Opportunities and room for growth